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Practical knowledge tips for heating
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Guidebook providing practical knowledge tips for heating applications

Heating know-how for commercial applications. Here you'll learn which type of mobile heaters is suited best for which type of professional requirement.

Whether you opt for a direct oil heater fan, a flue pipe oil heater fan, an electric heater or a gas heater – every mobile heating system has its individual benefits. To make sure that you find exactly the right heating solution for your specific application, we're providing you with some details of the properties here. Furthermore you'll learn under which circumstances you can also install a heater outside and how you calculate the heating capacity actually required, depending on the size of the room.

Mobile heating devices bring pleasant temperatures into the shell construction, the storage hall, the workshop, the greenhouse or the stable. Depending on the site of installation, however, completely different requirements are posed to the heating devices. Do you, for example, only want to heat a building during the construction phase or additionally also dry it quickly? Are you dealing with the heating of well-ventilated winter construction sites, or do you wish to bring agreeable temperatures into temporary accommodations, tents or workshops?

At Trotec you'll find the right heating device for every application – both for purchase and for renting.


Oil heater fan

Oil heater fans are divided into direct heaters without a flue pipe and indirect heaters with a flue pipe. In the following we'll describe the differences between the two systems to you and we'll point out the pros and cons to you.

Direct oil heaters

Direct oil heaters

Heating capacity of 100 % ‑ for the use in well-ventilated interior spaces and roofed outdoor areas.

In a directly fired oil heater, the fan also see to the combustion air to then blow out the heated air. For this purpose, first, fuel is atomized, ignited and burned in the combustion chamber. Then the hot combustion gases are admixed to the main air current of the fan.

In addition to the heat, oil heaters also emit the combustion waste gases directly into the room. Therefore, direct oil heater fans have no chimney and are not suitable for the use in closed rooms without good ventilation (oxygen supply) – especially if these rooms are used by persons and animals. Since furthermore additionally approx. 1.6 kg water vapour per litre of fuel are released in the combustion process, direct heaters should never be used for construction drying – in this way the building would be submitted to permanent "forced humidification"!

On the other hand, direct oil heaters are suitable for the use in well-ventilated interior spaces or roofed over outdoor areas, since they provide the total heat generated. This process is therefore also referred to as 100 % heating capacity.

Good to know: Direct oil heaters ...

  • are suited for the use in well-ventilated interior spaces and roofed outdoor areas
  • generate a heating capacity of 100%
  • emit the combustion waste gases directly into the room together with the heated air
  • are unsuitable for closed rooms that are used by persons or animals
  • cannot be used for construction drying, since the combustion generates approx. 1.6 kg of water vapour per litre of fuel
  • must not be used in rooms with a fire hazard due to the storage of flammable substances
Functional principle of the Trotec direct oil heaters

The functional principle of direct oil heater fans

Cold air is drawn into the interior of the oil heater by a fan. The air is guided through both the combustion chamber and around the outside and in this way is strongly heated. In addition to the hot air, this process therefore also blows the combustion waste gases out of the oil-fired heater.

Since the whole heat output is released 1:1 into the room, the efficiency of direct oil heaters is 100 % – which is ideal, for example, if you wish to heat well-ventilated halls, stables or roofed over outdoor areas quickly and effectively.

Functional principle of the Trotec infrared radiant oil heaters

Direct infrared radiant oil heaters (without fan)

Targeted infrared heat radiation.

On construction sites, in storage areas or workshop halls, mobile infrared radiant oil heaters supply targeted warmth. In contrast to oil heater fans, infrared radiation does not warm the room air, but the objects at which it is directed. In particular in draughty areas in which the warm air of oil heater fans would simply be blown away, infrared radiation is an effective heating alternative – comparable to the natural principle of the warming solar radiation. Since infrared radiant oil heaters usually do not have a fan, no dust can be raised during heating operation either. Just as with direct oil or gas heater fans, the combustion waste gases of infrared radiant oil heaters are released into the room. The room to be heated must therefore be well-ventilated to ensure that the exhaust gases can escape and that a sufficient supply of oxygen is provided for.

The functional principle of direct infrared radiant oil heaters

The infrared radiant oil heater is provided with a large-surface ceramic plate which is strongly heated from the inner side by a flame in the combustion chamber. The hot plate then releases the heat to the outside in the form of infrared radiation. As the whole heat output is radiated 1:1 into the room, the efficiency of infrared radiant oil heaters is 100%, just like that of direct oil or gas heater fans.

Good to know: Direct infrared radiant oil heaters …

  • heat objects with their infrared radiation, but not the air
  • work without a fan and therefore, for example, do not raise any dust
  • are suited for the use in well-ventilated interior spaces and roofed outdoor areas
  • generate a heating capacity of 100%
  • emit the combustion waste gases directly into the room along with the heated air
  • are unsuitable for closed rooms used by persons or animals
  • cannot be used for the purpose of construction drying, since the combustion generates approx. 1.6 kg of water vapour per litre of fuel
  • must not be used in rooms with a fire hazard due to the storage of flammable substances

Flue pipe oil heaters (also referred to as indirect oil heaters)

No emissions scandal at Trotec! Fluel pipe heaters supply emission-free heat for indoor use.

Whether you require it for shell constructions, in storage facilities, in workshops or in the agricultural sector – the warm air of flue pipe oil heater fans does not contain any combustion waste gases. In the case of indirect heaters with a flue pipe the air to be heated is fully isolated from the combustion chamber. The air is heated while flowing past the enlarged area of the combustion chamber, the heat exchanger. The fan blowing warm air into the room to be heated also provides the required combustion air. But the combustion products are led away into the open air by a chimney ‑ the significant feature of "indirect" heaters.

In order to obtain both clean and dry warmth, we therefore recommend using an indirect oil heater. Because in contrast to the direct oil heaters, neither exhaust gases nor water vapour enters the room air. Instead, both of them are dissipated into the open air by the chimney.

Indirect oil heaters are ideally suited for rooms in which ventilation is only possible to a certain extent, but which still are to be used by people and animals. They are also a good choice for speeding up construction drying as well as in rooms where there is a fire hazard due to combustible substances.

Good to know: Indirect oil heaters …

  • fully isolate the heated air from the combustion chamber
  • feature a flue pipe as their significant characteristic
  • Unlike directly-fired oil and gas heaters, dissipate the combustion gases via the chimney and do not release them into the room
  • attain a thermal efficiency of approx. 92 to 95 %, since approx. 5 to 8 % of the heat output is lost through the chimney
  • produce clean (soot-free) and dry (condensate-free) warmth
  • can be applied in rooms without ventilation, which are used by persons or animals 
  • are suited for speeding up construction drying
Indirect oil heaters

The functional principle of indirect flue pipe oil fan heaters

These devices also draw the cold outdoor air into the heating unit by means of a fan. In contrast to direct oil heater fans, the combustion chamber (or the heat exchanger) is not fully isolated from the air current that is blown out, preventing the exhaust gases and the water vapour generated in the course of combustion from being mixed with the hot air blown out into the room.

Instead, the two undesired by-products are dissipated to the outdoor area via a chimney. This is the reason why the clean and dry air of flue pipe oil heaters is especially suitable for areas used by persons or animals as well as for assisting construction drying.

The efficiency factor of indirect oil heaters with a flue pipe, however, is a bit lower than that of direct oil heaters without a flue pipe. Since approx. 5 to 8% of the heating energy of indirect flue pipe oil heaters is dissipated into the open air through the chimney, along with the exhaust gases and the water vapour, the efficiency in contrast to direct oil heaters without a chimney flue pipe is only approx. 92 to 95% instead of 100%.

Functional principle of Trotec's indirect flue pipe oil heaters

Gas heater fans

Gas heater fans are also direct heating systems without a flue pipe. They dissipate their exhaust gases into the room along with the heat generated.

Gas heaters

Cost-effective instant heat for the use in well-ventilated interior spaces and roofed outdoor areas

Gas is a low-priced energy source that is easy to transport. The gas heater fans from Trotec offer an unmatched value-for-money ratio where the effective immediate heating of well-ventilated construction sites, workshops, storage facilities, garages, stables, greenhouses or also roofed outdoor areas, tents and camping applications are concerned. Safety is also a major issue: An integrated temperature sensor serves as flame failure protection and prevents the emission of unburnt gas. In the case of overheating the gas supply is automatically interrupted by means of a safety thermostat, while the fan for cooling continues running. The specially shaped discharge grille of the Trotec gas heaters prevents direct contact with the flame whilst ensuring an optimally swirled, high-volume current of warm air. With propane gas, gas heater fans can also be used at very low temperatures. The boiling point of propane gas is -42 °C. Owing to their extremely compact design, the heating devices can be transported comfortably even in the smallest of car boots.

Since connection hose and pressure reducer for connecting the gas cylinder are already included in the scope of delivery, nothing more than a socket and a propane cylinder is required for the heating operation. Once in operation, agreeable warmth begins to spread immediately, seeing as the integrated blower ensures an effective air flow made up of sucked in ambient air and blown out warm air. In this way even larger rooms of up to approx. 300 m³can be quickly heated. However, since the combustion waste gases are also released into the room just like it is the case with direct oil heaters, optimum ventilation of the area to be heated must be absolutely ensured – especially if it is used by persons and animals. In contrast to oil heater fans, though, heating with gas does not produce any Diesel or oil fuel odours. However, the combustion process also generates approx. 1.6 kg of water vapour per litre of fuel in this application.

Good to know: Gas heater fans …

  • are suited for the use in well-ventilated interior spaces and roofed outdoor areas
  • generate a heating capacity of 100%
  • emit combustion waste gases directly into the room along with the heated air
  • are not suitable for the use in closed rooms
  • cannot be used for construction drying, since the combustion generates approx. 1.6 kg of water vapour per litre of fuel
  • must not be used in rooms with a fire hazard due to the storage of flammable substances
Functional principle for gas heaters of the TGH-E series

The functional principle of direct gas heater fans

The gas-fired direct heaters of the TGH-E series draw in the ambient air through a blower, then heat the main air current using a gas burner and finally discharge the heated air to the room. This means that also the exhaust gases produced by the combustion process as well as water vapour is blown out into the room along with the heated air.

The room or the roofed outer area to be heated must be very well-ventilated by all means, so that the exhaust gases are blown away by a natural draught and oxygen can enter the room permanently. Due to their high development of humidity during operation, gas heaters cannot be used for assisting construction drying.


Electric heaters

Electric heaters are divided into electric hot-air fans and infrared radiant heaters. Both variants have their individual advantages.

Electric hot-air fan

Comfortable, reliable, clean and quick warmth without oxygen consumption.

On construction sites, in storage facilities, in market stalls – no one likes to stand, let alone having to work, in the cold longer than necessary. And thanks to the modern and innovative electric heating solutions like those offered by Trotec, no one has to. 

The reason why electric heaters are so popular is their almost infinite operational capability. Electric heaters deservedly claim to be the most reliable, quickest, and the most convenient method for problem-free heating. 

Therefore electric heater fans can be practically used everywhere, since in contrast to directly fired gas or oil heaters they neither consume oxygen nor generate combustion waste gases. This means that no supply or exhaust air openings are required – the corresponding power connections is all that you need.

As a result, they can be used throughout all sectors – for instance for construction projects, in party tents, storage facilities and workshops, on ships, in switching stations, stables, garages and in temporary accommodations. In particular, electric heaters serve to assist dehumidifiers with construction drying, since higher room temperatures significantly shortens the drying periods.

Whether you use conventional heating wires, heating coils or ceramic PTC heating elements – at Trotec you'll find the right electric heater solution for your application.

Specially for the heating of tents we furthermore recommend our HEATBOX to you. Here you'll find more information about this innovative electric heating system!

Good to know: Electric hot-air fans …

  • are considered as the most reliable, the quickest, and the most convenient heating method
  • generate a heating capacity of 100%
  • do not consume oxygen
  • do not generate any combustion waste gases
  • produce clean (soot-free) and dry (condensate-free) warmth
  • can be practically used everywhere without any problems, also in unventilated rooms used by persons or animals
  • are suited for speeding up the process of construction drying
  • depending on the electricity tariff, usually produce higher operating expenses per kW than oil- or gas-powered heating devices

What is the difference between electric heaters with ceramic PTC heating elements and electric heaters with a heating coil?

In the two following diagrams, the PTC ceramic heater element is marked with (A) and the heating spiral technology is marked with (B) .

Compared to the conventional heating coil technology (B) the shorter heat-up times are not the only distinguishing feature of Trotec fan heaters with PTC ceramic heating elements (A). There are also process-related differences in the response behaviour of the heating elements.

Although both devices maintain the preselected target temperature (orange line) by means of thermostat control using a two-position controller, the respective temperature adaptation takes place significantly more slowly and with greater deviations from the desired target temperature in case of devices with heating coils. The reason for this is the different conductivity behaviour of the heating elements: if current flows through the heating coils, the coils will always have the same temperature once they have heated up. For controlling the desired room temperature, the power supply is first interrupted, making the coil cool down, and then re-activated by the thermostat so that the coil heats up again completely before it is switched off again when the set target temperature is reached. 

This "on/off process" causes significantly greater temperature fluctuations around the desired target temperature than with ceramic heating elements, for the material of the latter provides an integrated temperature self-regulation.

The hotter PTCs get, the higher is their electrical resistivity, resulting in less current flowing through the heating element and in a reduced heating capacity, and thus in significantly lower temperature fluctuations and less switch-on and switch-off processes in thermostat-controlled operation.

For this reason, ceramic fan heaters are able to create more even room temperatures for temperature-sensitive manufacturing processes as well as a more agreeable room climate. 

However, PTC fan heaters (A) are not suitable for dusty environments (e.g. coarse dust, construction dust, sawdust, etc.), because there is the danger that the fine mesh PTC heater battery is clogged by dust. As a result the air current is blocked and the ceramic PTC heating device fails. Therefore the PTC heating element must be checked for pollution at regular intervals and cleaned with compressed air, if necessary. Electric heating devices with heating coil technology (B) are therefore more suitable for dusty environments, since they are not blocked by dust as quickly.

PTC ceramic heaters
  • Quick heat-up performance
  • Only minor variations when maintaining the preset target temperature (approx. +/- 2°C)
  • Lower blow-out intensity and throwing range of the warm air in comparison to electric spiral heaters. In large rooms this may possibly produce uneven temperature zones
  • Not suitable for dusty environments (e.g. construction sites, stables), since the fine mesh PTC heating element may clog (regular cleaning if required)
  • Suitable for allergy sufferers, since due to the lower temperatures on the heating element no dust, hair or lint is burnt and therefore neither odours nor residues are released into the air
Heating coil technology
  • Slower heat-up performance
  • Greater variations when maintaining the preset target temperature (approx. +/- 4°C)
  • Higher blowing-out performance and throwing range of the warm air. This also allows larger rooms to be heated more steadily
  • Also suitable for dusty environments (e.g. construction sites, stables), since the heating elements do not clog (no regular cleaning effort required)
  • Not suitable for allergy sufferers, since dust, hair or lint may burn at the heating element due to the high temperatures and therefore odours and residues may be released into the air

Infrared radiant heaters
TIH 350+ / TIH 650+ – flexibly variable professional system

Infrared radiant heaters

Pleasant, targeted warmth and no warm-up time required – ideal for heating workplaces.

Whether you require them for heating applications in site trailers, workshops, storage facilities or stables – modern infrared radiant heaters produce direct heat immediately after switch-on, based on the natural principle of solar radiation. Unlike with the use of conventional electric heating devices the infrared rays here do not heat the room air but materials and objects they are directed at – such as walls, the floor or the ceiling. These can store the heat for a longer period than air and then release it to the room in the form of secondary radiation. Infrared radiation immediately generates an agreeable sensation of warmth on the skin.

The intense infrared heat is produced with an efficiency of 100% – a clean way of heating without causing noise, smells or dust circulation, hence also suitable for allergy sufferers. Whether you use it as wall radiator or in a free-standing version – since infrared radiant heaters work without causing noises and do not consume oxygen they can be used without any problems in environments with persons and animals. Depending on their IP protection class, they are sealed against rain and dust and therefore also for unroofed outdoor areas.

Specially for construction drying:
Infrared heating panels – steady heat distribution over the whole surface

Professional infrared heating panels are suitable for the surface drying of walls in new buildings or after water damage, as they produce dry (condensate-free) and large-surface heat radiation. Especially massive brickwork can be dried faster as compared to conventional dehumidification. Up to three professional infrared heating panels of the Trotec models TIH 350+ and TIH 650+ can be combined quickly and stably in for large-scale drying in batch mode.

Good to know: Infrared heaters …

  • are ideally suited for the targeted heating of workplaces
  • provide direct warmth (100 % heating capacity) without any warm-up time
  • do not consume oxygen
  • do not generate any combustion waste gases
  • produce clean (soot-free) and dry (condensate-free) warmth
  • can be used in interior and outdoor areas, depending on their IP protection class
  • can be applied in rooms without ventilation, which are used by persons or animals
  • in the form of professional infrared heating panels are suitable for speeding up construction drying

Trotec offers you infrared radiant heaters from 1.2 kW to 20 kW. Click here to go to the overview of infrared radiant heaters and to the infrared heating panels for professionals from Trotec.

Quick comparison: Which type of heating for which application?

Direct radiant oil heaters (without a flue pipe)

Direct oil heaters without a flue pipe and infrared radiant oil heaters

(from 20 kW to 100 kW)

Direct oil heaters and infrared radiant oil heaters are ideally suited for the use in well-ventilated interior spaces, where the whole heat that is generated is actually provided (100% performance).

Note:
In addition to heat, direct radiant oil heaters (without a flue pipe) and infrared radiant oil heaters also emit combustion gases directly into the room.

For this reason, they are unsuitable for poorly ventilated, closed rooms (oxygen supply) if these rooms are used by persons or animals.

Furthermore they additionally generate approx. 1.6 kg water vapour per litre of fuel during the combustion process and therefore they are not suitable for drying the building structure. When using direct radiant oil heaters to speed up a process of construction drying, there would at worst be more moisture in the building than before!

In rooms with a high risk of fire hazards, where flammable substances are stored, direct oil heaters and infrared oil heaters must not be used.

Gas heater fans

Direct gas heaters

(from 10 kW to 30 kW)

Gas heaters are suitable for the use in well-ventilated interior spaces and roofed outdoor areas, actually providing the whole heat that is generated (100 % performance).

Note:
In addition to heat, gas heater fans also emit combustion gases directly into the room.

For this reason, they are unsuitable for poorly ventilated, closed rooms if these rooms are used by persons or animals.

Furthermore, the combustion process generates approx. 1.6 kg of water vapour per litre of fuel. Direct gas heaters are therefore not suitable for construction drying. When using gas heater fans for construction drying, in the worst case there would be more moisture in the building than before!

Also in rooms with a high risk of fire hazards, e.g. due to the storage of flammable substances, gas heaters must not be used.

Indirect radiant oil heaters (with a flue pipe)

Indirect radiant oil heaters with a flue pipe

(from 20 kW to 375 kW)

The generation of clean and dry warmth without combustion products or water vapour ending up in the room air requires the use of indirect heaters (with a flue pipe).

In the case of indirect radiated oil heaters the air to be heated is completely separated from the combustion chamber and can be guided either directly into the corresponding rooms or via tubes.

The combustion waste gases, however, are discharged into the open air through the flue pipe. Therefore the efficiency of the heating capacity is not 100% as is the case with direct radiant oil heaters, but only approx. 92 to 95%, since part of the hot air is lost through the chimney together with the exhaust gases.

Indirect heaters are therefore ideally suited for rooms used by persons or animals and in which ventilation is only possible to a limited extent.

Electric heaters

Electric heaters and infrared radiant heaters

(from 2 kW to 120 kW)

Electric hot-air fans and infrared radiant heaters are suitable as a reliable, quick and convenient heating solution. All it takes is a corresponding power connection and there is no additional handling expenditure as is the case with oil or gas heaters. Just like direct oil or gas heater fans, they offer an efficiency of 100% heating capacity. The heating process, however, produces neither combustion waste gases nor water vapour and no oxygen is consumed. The use in rooms that are used by persons and animals is therefore no problem.

Electric heaters are often used for construction projects, in marquees, storage facilities and workshops, on ships, in switching stations, stables, garages and in temporary accommodation. Electric hot-air fans are furthermore suitable to assist dehumidifiers in the process of construction drying, as they do not release any condensate (water vapour). In the case of the infrared heaters, IR heating panels are recommended for construction drying.

Depending on the electricity tariff, the operating expenses of electric heaters per kW are usually higher than those of oil- or gas-powered heating devices.

Revolutionizing tent and hall heating

HEATBOX

Save up to 70 % energy when you heat tents and halls!

Electric heaters are a good choice for heating interior spaces, tents or halls used by persons, since they work without combustion waste gases and at a low noise level. Depending on the electricity tariff, however, heating with electric heaters may become undesirably pricey. With the Trotec HEATBOX you are provided the possibility of saving up to 70 % of the energy used. This will offer tangible benefits to you! 

The circulation principle of the HEATBOX: 

The multiple use of interior heat and a proportionate fresh air supply provide for extensive saving potentials

In festival tents, exhibition pavilions or temporary accommodations permanent fresh air supply from the outside is absolutely required, ensuring that the persons inside are provided with a sufficient amount of oxygen for a pleasant room climate. The outdoor air supplied, however, is cold and must be warmed up first, a process taking up a correspondingly high amount of energy.

This is where the HEATBOX from Trotec comes in, since as an efficient circulation heating system the HEATBOX is provided with supply and exhaust air hose connections for an adjustable recirculation mixing operation. This means that only exactly the amount of cold air is guided into the interior area as is actually required. The larger part of the warm air from the interior area is led through the HEATBOX as "recirculation air" again, and is reheated with a considerably lower energy input. In this way a warm air circuit is produced, maintaining the warmth generated for as long as possible requiring only a reduced energy input and nevertheless supplying the tent with a sufficient amount of fresh air.

Benefit from the human body warmth

Every human being radiates heat. The heat released, however, varies, depending on the number of persons, their body height, weight and activity. In any case you can utilize the natural body warmth of your guests or customers for your own purpose, since the basic heat brought into the room by the persons does not have to be generated by the electric heating system anymore! Instead, the indoor air that is already heated by the persons is drawn into the warm air circuit of the HEATBOX and heated a bit more requiring a considerably lower heat energy. Just the proportion of the cold fresh air (oxygen) from outside has to be heated using a high energy input. Depending on how you regulate the proportion of cold fresh air supplied from outside by means of your HEATBOX, you save an according amount of heating energy required. This procedure makes it possible for you to reduce your energy costs by up to 70%.

The HEATBOX is also recommended for heating tents and halls without persons

When heating storage facilities or material tents without any movement of persons, no fresh air has to be supplied at all. The 100 % application of regeneration air makes it possible to establish a maximum energy-saving heating circuit with the HEATBOX.  

Another advantage of the HEATBOX: Unlike oil heaters (applied as standard) which repeatedly switch on and off to achieve the target temperature, the HEATBOX can maintain the target temperature on a permanent basis by adjusting the supply of fresh air and energy precisely.

This results in a more consistent room climate with a constant oxygen concentration and a consequently more agreeable overall climate in the interior space of tents or halls. The additional sound insulation of the HEATBOX furthermore produces a lower noise emission.

Recirculation set for fresh air supply for indoor use of electric heaters

The circuit heating system described above also works if the electric heater is installed in the interior space, but nevertheless is to draw in fresh air from the outside via a hose connection. For this purpose we recommend the recirculation set from Trotec as an accessory part for the two Trotec electric heaters TEH 70 and TEH 100.

Inhabited accommodations must be regularly supplied with fresh air. When heating with electric heaters positioned indoors, ventilation via doors and windows entails unpleasant concomitants, such as draught and humidity problems. The recirculation set, on the other hand, can be used to establish a controlled fresh air supply without any negative side effects.

The installation is conceivably easy: The two-piece set consists of a T-distributor and an adapter, which can be screwed on to the back plate of the heating devices TEH 70 or TEH 100. One suction nozzle of the T-distributor is fitted with an air hose, which is led to the outside of the tent. Via the second nozzle, regeneration air from the room is sucked in. Thanks to an integrated controller, the mixing ratio can be infinitely adjusted.

Save up to 70 % energy when you heat tents and halls!

Good to know: the Trotec HEATBOX …

  • Saves up to 70 % energy when used for heating tents and halls
  • As a circuit heating system, utilizes the regeneration air from the interior space, which is already warm
  • Is provided with a variable regulation of the ratio between circulating air and fresh air in the heating air
  • Creates a considerably more agreeable climate in festival tents, exhibition pavilions or temporary accommodations
  • Is provided with a weatherproof design for permanent outdoor use and protected against tampering by a lockable service flap
  • Reduces the fan noise by additional acoustic insulation
  • Is available as precisely tailored accessory part for the Trotec electric heaters TEH 70, TEH 100 and TDE 95
  • Can also be used alternatively in the form of the "Recirculation set" for Trotec electric heaters installed inside

HEATBOX – functional principles and saving potentials

Functional principle of the Heatbox - example A
  • Example A shows a "conventional" heating scenario. The mixing controller is set to 0 % of recirculation air, which means that only outdoor air, having a temperature of 0 °C, is used for heating. When set to the maximum heating level 4 (18 kW), the electric heating device generates hot air with a temperature of 38 °C, which heats the tent up to approx. 20 °C.
Functional principle of the Heatbox - example B
  • In example B the mixing controller is set to 100 % of recirculation air – only regeneration air is used for heating. Since hot air is now generated by means of preheated air, the usable heating capacity is considerably higher. Once the target temperature has been reached, the device can therefore be switched from the highest heating level to one or two levels below and can thus be reduced by up to 66%.
Functional principle of the Heatbox - example C
  • Example C shows a 50 % mixed operation with outside and regeneration air. Even when switched down to heating level 3 (13.5 kW), the use of 50 % of heated regeneration air allows to heat up the tent more than in example A with fresh air only – this corresponds to energy savings of 33 %.
Functional principle of the Heatbox - example D
  • Example D demonstrates a 50 % mixed operation yielding roughly the same heating result at heating level 2 (9 kW) as is achieved in example A with the highest heating level and 100 % of fresh air, which corresponds to a 66 % reduction of energy consumption.

The Heatbox and the recirculation set are available both for renting and for purchase:


Accessories

How to also install heaters outdoors

Indoors or outdoors? Actually, there shouldn't be two opinions about where a mobile heater finds its optimum location. Neither from the aspect of efficiency nor from an ecological point of view there's a reason why the heater should not be installed in the house. Unless it would simply be too big – but even for this case we'll find a solution. However, if it absolutely does not fit: of course we have the suitable equipment at the ready for you if you choose to make a change "from outside to inside".

Heaters with a performance of more than 100 kW are often placed in front of the building to be heated because of their size. The heater now warms the cold outdoor air and blow it into the building via air transport hoses.

Naturally it is clear that a heater which is installed outside requires a considerable greater amount of time, energy and fuel to provide the desired temperature in a room than a heater installed inside. This is because this heater heats on the principle of recirculation, which means that it just continues heating the room air that has already been heated.

Since the fuel consumption in the case of an outside installation of the heater is often two to three times higher, with regard to the common models Trotec always offers heaters with a compact design, if possible. As these devices, with their width of only 80 cm, fit through all normal doors!

If you are looking for a solution which only fits "outdoors"

Then you should also be sure to rely on the proven Trotec brand quality when it comes to the air transport hoses. The combination hose SP-C for the connection to mobile oil and electric heating units, for instance, on its first two metres consists of especially resilient neoprene tissue, designed for a temperature range from -24 °C to +150 °C. With its standard length of 7.6 m, which can be optionally extended, you can decide flexibly where you wish to install your mobile heater.

It gladly stays "outside"

Because large heaters need an extra dose of oil: owing to its nationwide licence as storage tank in compliance with AIII, there is no restriction as to the outdoor areas where you're allowed to install the double-walled fuel tank TFC 1000 – even in water protection areas! The tanks are provided with forklift pockets and crane lifting lugs as standard and, due to their stackable design, they can be quickly installed and removed. In order to be protected against tampering, the tanks come equipped with lockable lids.

How to calculate the heating capacity required:

Online calculators

With our Heating capacity calculator You can easily and conveniently calculate yourself online which heating capacity you require for your rooms.

If you prefer carrying out the calculation using a pen and paper, please find below a list of all relevant aspects for calculating the heating capacity.

Or call us under +49 2452 962-160 and we'll be happy to help you!

To the heating capacity calculator

The following information is required for calculating the heating capacity: 

1  Which room temperature is to be reached?

2  What is the current or expected minimum outside temperature?

3  What is the total volume of the room to be heated?

4  Which average heat transfer coefficient (U-value) does the building have?

The temperature to be reached depends on the individual requirements.

U-values for practical applications

The following list shows U values for the heating of a building:

Very high degree of insulation
(modern passive house standard) U = 0.2

High degree of insulation
(modern low-energy houses) U = 0.5

Good insulation
(conventional new buildings from 1984 and later) U = 1.2

Poor insulation
(old buildings) U = 3.0

No or almost no insulation at all (tents)
U = 4.0


Calculation of the heating capacity for rooms of UP TO 1,000 m³

The following formula can be used to quickly calculate the heating capacity for small rooms sized up to 1,000 m³:

Room volume (Q) x U value x temperature difference = heating capacity in kcal

Conversion factors:
1 kcal = 1.16 watts = 4 BTU / hour

Example calculation:

Room volume (Q): 1,000 m³
Poor insulation (U): 3.0
Outside temperature: -5 °C
Desired room temperature: +12 °C
Temperature difference: 17 °C

Result for this example: 
1,000 m³ x 3,0 x 17 °C = 51,000 kcal

Conversion of kcal into watts:
51,000 kcal x 1.16  = 59,160 watts


Calculation of the heating capacity for rooms FROM 1,000 m³

The diagram below can be used to quickly calculate the heating capacity for large rooms sized 1,000 m³ and more.

The values stated are guided by the capacity demand for temporary heating with normal insulation and a minimum outside temperature of -5 °C.

Diagram for the calculation of the heating capacity

Example calculation:

In order to heat a room volume of 5,000 m³ at an average outdoor temperature of -5 °C by 17 °C to a desired room temperature of 12 °C you'll require approx. 23 watts / m³

The total heat requirement in this example calculation is therefore 5,000 x 23 W = 115,000 W = 115 kW

Calculation information: 

With a good thermal insulation 15 % of the capacity can be deducted, should it be poor, 15 % have to be added.

Calculation of the heating capacity for marquees

Depending on the floor space of the marquee and the season the following bases of calculation can be used to calculate the heating capacity for marquees:

January approx. 580 watts / m²
February approx. 580 watts / m²
March approx. 460 watts / m²
April approx. 400 watts / m²

May to September approx. 320 watts / m²
October approx. 400 watts / m²
November approx. 460 watts / m²
December approx. 580 watts / m²

Legal notes / disclaimer:
These notes have been compiled the best of our knowledge and belief, however, they do not replace a professional expert consultation. For calculating your actually required heat capacity, please refer to our expert consultants. All results of the calculation serve to the purpose of rough estimation only. Trotec GmbH and TKL GmbH will in no case assume any liability for any consequential damages. The use shall be at the user's own risk and responsibility. Our General Terms and Conditions apply in addition.

We're happy to be of service! Your contact to Trotec.

We'll be pleased to be at your service for a non-binding consultation. Our committed service team will analyze your individual requirements and offer you a tailor-made heating solution. On the basis of our long-standing experience we can always compile the optimum device combination for you – offering you the best performance at the best price. We're looking forward to hearing from you!

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Trotec GmbH
Grebbener Straße 7
52525 Heinsberg

Purchase: +49 2452 962-400
Rental: +49 2452 962-160
Fax: +49 2452 962-200

E-mail: info@trotec.de
www.trotec.de

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