By Kevin Pennycook, D. Churcher, D. Bleicher
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Extra resources for A Guide to HVAC Building Services Calculations
Different types of lamp will give different heat outputs in both radiant and convective form. The percentage of radiant heat is required when dealing with air and environmental points. The location of the lamp will also have an impact on the direction of the output. A recessed light fitting within a ceiling void will heat the air in the void increasing the ceiling temperature, which in turn will heat the space. If there is significant airflow through the void the heat gains from the lights may be removed.
2. 3. 4. Restrictions in the choice of flue that can be used may influence the type of boiler used in the system. 2 gives details on the types of boilers available and their suitability for different applications. Pre-heat is usually considered with the boiler capacity rather than the radiator capacity, but not both. Applying a plant factor for preheating capacity effectively adds a margin to the system size and should be carefully considered. Check if any margins have been added elsewhere in the design and avoid the use of duplicate margins.
Step 1. Use qm = 100φ ÷ (ηhg) Calculations on this sheet will give a preliminary height and size of the flue. The final design should normally be carried out by a specialist (such as a flue manufacturer), taking into account pressure drops and flue resistance. To achieve this, the flue or chimney design must take into consideration many aspects of the system and building in which it is housed. These include whether the flue/chimney is free standing or adjacent to a building, and whether it is a single or multi-flue system.
A Guide to HVAC Building Services Calculations by Kevin Pennycook, D. Churcher, D. Bleicher