24 June 2014

Techno-Economic Modeling and Monitoring of Hybrid Ground-Source Heat Pump System with Borehole Heat Exchangers for Cooling-Dominated Cellular Tower Application

The technical and economic performance of a hybrid ground-source heat pump system satisfying the cooling requirements of a cooling-dominated cellular tower shelter were
investigated. An experimental full-scale ground-coupled heat pump system is described that is designed to meet an annual cooling demand of approximately 60 MWh. The system is
equipped with a dry-cooler for reservoir recharging, an air-economizer for cooling with Cold ambient air, and an extensive data acquisition and monitoring system to assess the behavior of the geothermal reservoir and surface components. The reservoir consists of 4 single-U and 2 double-U borehole heat exchangers, an open-hole water monitoring well and several
temperature monitoring wells. Further, a simplified techno-economic model is presented to simulate the performance of these systems and to explore their potential to replace traditional wall-mounted air-source air conditioning units. Preliminary results show that the
ground-source heat pump with air-economizer but without dry-cooler has the lowest life cycle cost of 5 cases analyzed, although closely followed by the air-source unit with aireconomizer.