Download e-book for kindle: A Guide to HVAC Building Services Calculations by Kevin Pennycook, D. Churcher, D. Bleicher

By Kevin Pennycook, D. Churcher, D. Bleicher

ISBN-10: 0860226573

ISBN-13: 9780860226574

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Design outputs • Schedule of internal gains and sources for each space giving The total heat emission from occupants comprises sensible heat gains and latent heat gains. The sensible heat gains affect the temperature within the space, whereas the latent gains affect the humidity in the space. References Heat emission can vary from 90 W sensible and 25 W latent per person when seated at rest to 190 W sensible and 250 W latent per person for heavy work at 20°C. 3 of CIBSE Guide A. The three main considerations when dealing with occupancy gains are: Occupancy hours – Is the building used for daytime use only or is it used 24 h/day (such as call centres and hospitals).

Sheets H6 and H9 discuss plant loads. When a building is continuously heated there will be some diversity between the heating loads in different spaces. 0 for a single building heated as one space. This section describes a simplistic approach to configuring heating plant, and more complex systems may require a more detailed solution. Intermittently heated buildings Designers need to note the following: • • • Systems that combine mechanical ventilation plant and heating plant can have different peak loads and different start times for each system.

Some buildings may have zones or rooms that are maintained at a different temperature to the rest of the building. The individual systems that serve these rooms will need to be sized to take into consideration the gains and losses through internal walls to the rest of the building, likewise the system serving the rest of the building will need to be designed to consider the impact of these individually conditioned spaces. Design information required Identifying heat from occupants For each type of lamp used, details of the heat output, number of lamps and hours of use are required.

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


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