Abstract:

For analyzing from the point of the whole system the operational energy consumption of central air conditioning systems with air source heat pump unit, the global energy intensity index based on the thermal comfort of the conditioned space is put forward. It includes the energy consumption of all the system subloops. Through the decomposition of （Energy Intensity，EI）, the e-p analysis method for the whole system and its subloops is built, which can easily analyze the change of the specific consumption  (e)  and delivered fluid ratios (p) on EI. It is indispensable to decrease the specific consumption (e) and delivere fluid ratios(p) of each sub-loop in order to decrease the EI of HVAC systems.

Key words: air source heat pump; central air conditioning system; the e-p decomposition method; global energy intensity; energy saving