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http://dx.doi.org/10.17664/ksghe.2021.17.4.068

Cooling Performance Analysis of Ground-Source Heat Pump System with Capacity Control with Outdoor Air Temperature  

Sohn, Byonghu (Department of Building Energy Research, KICT)
Publication Information
Journal of the Korean Society for Geothermal and Hydrothermal Energy / v.17, no.4, 2021 , pp. 68-78 More about this Journal
Abstract
In order to solve the increasing deterioration of the energy shortage problem, ground-source heat pump (GSHP) systems have been widely installed. The control method is a significant component for maintaining the long-term performance and for reducing operation cost of GSHP systems. This paper presents the measurement and analysis results of the cooling performance of a GSHP system using capacity control with outdoor air temperature. For this, we installed monitoring equipments including sensors for measuring temperature, flow rate and power consumption, and then monitored operation parameters from July 9, 2021 to October 2, 2021. From measurement results, we analyze the effect of capacity control with outdoor air temperature on the cooling performance of the system. The average performace factor (PF) of the heat pump was 6.95, while the whole system was 5.54 over the measurement period. Because there was no performance data of the existing GSHP system, it was not possible to directly compare the existing control method and the outdoor air temperature method. However, it is expected that the performance of the entire system will be improved by adjusting the temperature of cold water produced by the heat pump, that is, the temperature of cold water on the load side according to the outside air temperature.
Keywords
Ground-source heat pump; Cooling performance; Capacity control; Outdoor air temperature; Vertical ground heat exchanger;
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