Indirect heating of tents: quiet, draught-free and economical

Heat emission via a closed heating circuit halves energy costs and provides a good climate


Demands on events held in tents are becoming more and more sophisticated. As the quality of leisure experience increases, so do the demands for increased comfort. The look and design of events, presentations and company functions are tailored to no longer conveying that feeling of being in a tent. A major contributor here is the climate in the tent: cosy warmth at cold outside temperatures, pleasant cool air in the summer. And, of course, quiet, draught-free and without any irritating smells. Next to the comforts of heating and air-conditioning of tents, energy costs play a major role. Tents do not offer thermal shells like buildings, so that the provided heating or cooling energy quickly escapes through the tent tarpaulins and leads to greater energy requirements.

Heating of tents without impairment of air quality
This requires systems which provide the desired temperatures in the tent both inconspicuously and with high energy efficiency. The differences in systems become apparent in tent heating. One distinguishes between between air-based and water-based heating systems. Air-based heating is the "classic" method: heating fans which blow heated air into the tent via flexible air hoses by ventilators. Cold ambient air is heated and passed directly into the hot air flow. However, this type of heating leads to a high air exchange rate and can lead to unpleasant draught episodes. The heating fans are fired directly which means that exhaust gases enter the tent together with the hot air flow. Together with the heated air directly from the burner flame, this leads to a deterioration of the air quality in the tent.

Meeting requirements and reducing energy costs
Higher demands and increasing energy costs therefore require other technical solutions to provide comfortable and efficient heating of tents. For this reason the energy service provider Hotmobil Deutschland GmbH has placed its focus on water-based heating systems. This method of heating operates on the principle of hot water central heating: heat is generated outside the tent using a mobile heating unit. Using hoses, the hot water is transported to mobile fan units which are located inside the tent and which silently pass the air into the room air. This method of indirect heating not only keeps the air free from combustion gases, it also requires a lower rate of air exchange which reduces draught. As a result, indirect heating of tents provides better air quality at better heating comfort - as well as considerably less energy.

The indoor heating principle - on a mobile basis
The significant reduction in energy requirements for water-based heating of tents is easy to explain when examining the energy consumption of indirect tent heating: the water-based heating circuit between the outdoor mobile heating unit and the indoor mobile ventilation units acts like the indoor heating system in buildings with a flow and return system. The return flow to the heat generator still contains a major portion of as yet non-utilised thermal energy, so that the required increase in temperature is significantly less than for direct heating of the air. In contrast, the air-based variant operates on the fresh air principle. This means that cold ambient air is permanently aspirated and then the entire air volume needs to be heated to the desired temperature. This results in corresponding high energy requirements.Compared to the burners of space heaters, the heating technology of mobile heating units operates with considerably better combustion quality, better efficiencies as well as being performance-modulated. Overall, this allows savings in fuel costs of at least 50 to over 70 per cent.

Hotmobil Deutschland GmbH is an energy services provides specialised in the manufacturing and renting of mobile energy units for heating, cooling and steam. The temporary heating solutions consist of a mobile heating unit tailored to the required performance, as well as mobile ventilation units for indoor use. Energy-efficient oil heating boilers up to 2,500 kW are available for generating heat for large tents and mobile halls, mobile electric heaters up to 36 kW are available for smaller requirements. Experienced professionals at the headquarters in Gottmadingen in southwest Germany coordinate the entire project, from enquiry to delivery and set-up through to completion of the project. Hotmobil provides its own personnel for delivery, installation and set-up and running maintenance."From a client's perspective, we believe it is essential for the customer to have immediate access to a permanent contact partner and to keep organisation to a minimum", states managing director Reto Brütsch.