Exactly what is Heat Loss and Heat Gain?
Making use of commercial software to calculate your heating and cooling loads significantly simplifies the ACCA Manual j8 load calculation process. Different software applications which provide results certified by ACCA to meet all requirements of MJ8 may be purchased including WrightSoft Residential. Heating and cooling load calculations are dependent on the building location, inside design conditions, orientation, as well as building construction.
Specifically what Determines a "Peak Heating Load"? The amount of heat lost into the outdoor environment at design indoor and outdoor conditions and has to be made up by the HVAC system to maintain occupant comfort is the peak heating load. Section 4 of the ACCA MJ8 covers in detail the components of the heating load calculation. The total estimated heat loss is a combination of the sensible heat loss through conduction, infiltration, as well as ventilation loads. Areas of heat loss are: - Loss through exposed walls - Ceiling/Roof loss - Loss through basement floor surfaces - Infiltration Loss through windows, floors as well as envelope cracks - Ventilation - Loss through below grade walls - Loss through windows and doors - Loss through attic knee walls
Precisely what Determines a "Peak Cooling Load"? The amount of heat gained by the house from the outdoor environment at design conditions and must be removed by the Hvac unit to maintain occupant comfort is called peak cooling loads. Cooling loads are made up of the sensible and latent heat gains. The mechanisms of heat gain are conduction, infiltration, ventilation, and radiation. The components of the cooling load calculation are addressed in depth in ACCA MJ8. Areas of heat loss are: - Gain through exposed walls - Conduction through windows and doors - Solar gain at glass - Sensible and latent infiltration gains at home windows, door and cracks - Sensible and latent gains from lights, people and appliances - Ceiling/Roof gain - Gain through attic knee wall - Ventilation
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