A Guide to HVAC Building Services Calculations by Kevin Pennycook, D. Churcher, D. Bleicher

By Kevin Pennycook, D. Churcher, D. Bleicher

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Double-panel, single convector This is a double-panel radiator with the additional finned element fitted between them to increase the output. Double-panel, double convector This configuration provides the greatest output due to the large amount of surface area obtained by having two panel radiators fitted together, each with a finned element. All types of radiators, are available in a variety of sizes, with standard heights and almost any length. Special non-standard units can be made to order.

2. Calculate the mean water temperature (mwt) as the average of the flow and return temperatures flowtemperature + return temperature mwt = 2 3. Subtract the room temperature from the mean water temperature to establish the system temperature difference. 4. Select the appropriate output correction factor for the system temperature difference from the manufacturer’s data. 5. Divide the room heat loss by the output correction factor to obtain a corrected required output figure. 6. Select a suitable radiator from the manufacturer’s literature, which meets the corrected required output figure.

By definition, pre-heat is applied to prepare the building for occupation, whereas the outdoor air load is only required during occupation. Remember that decisions made regarding boiler configuration will have a knock on effect throughout the system, for example requiring extra valve sets and pump sets. It will usually be helpful to discuss boiler configuration with one or more manufacturers, to take advantage of their greater expertise in their own product GUIDE TO HVAC BUILDING SERVICES CALCULATIONS © BSRIA BG 30/2007 29 Heating loads Cooling loads Water flow Air flow Acoustics H8 RADIATOR SIZING Overview Design information required The most common form of heating in domestic and nondomestic buildings is by radiators.

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