Energy loss simulation of horizontal circuit header in ground-source heat pump systems in Beijing

Establishes the energy loss model for the horizontal circuit header in vertical ground heat exchanger systems, and analyses factor influencing its energy consumption. Taking an office building in Beijing as example, simulates the energy loss influence on the heat pump unit COP during the heating season. For different lengths of the horizontal circuit header, presents the corresponding treating methods which can be used as references for ground-source heat pump system design.