Wilms Catalog - Air Conditioning and Heating Equipment Page 7
Commercial customer offer**Top sellers from Wilms
How to find your perfect heater Here you can find some rules of thumb for heating requirements in different types of spaces When it comes to choosing the type of heater and the heat output, it all hinges on the size and type of room to be heated. You can find the key product characteristics in the technical data provided on the relevant catalogue pages. The rules of thumb below will hopefully help you to make your decision quickly, as time is usually of the essence here! If an architect has calculated the amount of heat required, this should obviously take precedence. The rules of thumb for buildings and halls assume a max. temperature increase (difference between the lowest acceptable external temperature and the desired internal temperature) of 30 K (30 °C). For temperature increases outside of this range, the power calculated by the formula needs to be reduced or increased by 17% for each 5 K (5°C). The formulas for electric heaters give comparatively low heat outputs, as these devices do not require oxygen and so only a small exchange of air (ventilation) can be assumed. There is no need for ventilation openings as is the case with rooms heated using oil or gas. In the case of rooms with ventilation or, for example, halls with large doors that need to be reheated quickly, the increased ventilation heat requirement needs to be taken into account. This becomes more important the lower the heat output is in relation to the room volume, as the temperature losses cannot be compensated for quickly enough. For normal production halls and warehouses, a ventilation rate of 0.3 to 0.5 per hour can be assumed. No excess is required for these types of spaces. For a complete ventilation rate per hour, the excess is 10 W per m3. Buildings and halls Unrenovated old buildings or building shells without insulation: Oil or gas heaters: Volume (m3) x factor 0.058 = heat output (kW) Electric heaters: Volume (m3) x factor 0.041 = heat output (kW) Old buildings with average insulation: Oil or gas heaters: Volume (m3) x factor 0.040 = heat output (kW) Electric heaters: Volume (m3) x factor 0.030 = heat output (kW) New buildings with insulation: Oil or gas heaters: Volume (m3) x factor 0.025 = heat output (kW) Electric heaters: Volume (m3) x factor 0.020 = heat output (kW) Greenhouses and tents Unlike buildings and halls, when it comes to calculating the amount of heat required for greenhouses and tents, it is not the volume of the room, but rather the entire external surface in m2 that is used for the calculations. As the desired temperature increase can, once again, vary massively, it is covered in the respective formula below. Greenhouses and tents without insulation: Oil or gas heaters: External surface area (m2) x factor 0.0064 x temp. increase* = heat output (kW) Greenhouses with double glazing or double foil, thermal tents Oil or gas heaters: External surface area (m2) x factor 0.0037 x temp. increase* = heat output (kW) * Example: If the lowest outside temperature is -15°C and the desired indoor temperature is +23°C, the temperature should be set at 38. 7
24 Pages | Valid until 12/2024 | Previous page | Next page
Choose your language
Legal issues
The manufacturer is exclusively responsible for the content, price and article details of the products and offers presented in the catalogues. Subject to technical and optical changes by the manufacturer and errors excepted.
Request form for special products
The ToolTeam® Procurement Service
Are you looking for products that are shown in the catalogue but cannot be purchased directly online?Our procurement service will be pleased to make you a non-binding and individual offer.