23 September 2011

HOW THE LEED VENTILATION CREDIT IMPACTS ENERGY CONSUMPTION OF GSHP SYSTEMS — A CASE STUDY FOR PRIMARY SCHOOLS1


This paper presents a study on the impacts of increased outdoor air (OA)
ventilation on the performance of ground-source heat pump (GSHP) systems that heat and cool typical primary schools. Four locations? Phoenix, Miami, Seattle, and Chicago? are selected in this study to represent different climate zones in the United States. eQUEST, an integrated building and HVAC system energy analysis program, is used to simulate a typical
primary school and the GSHP system at the four locations with minimum and 30% more than minimum OA ventilation. The simulation results show that, without an energy recovery
ventilator, the 30% more OA ventilation results in an 8.0-13.3% increase in total GSHP system energy consumption at the four locations. The peak heating and cooling loads increase by 20.2-30% and 14.9-18.4%, respectively, at the four locations. The load imbalance of the ground heat exchanger is increased in hot climates but reduced in mild and cold climates.