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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-483-0

ISBN Online: 978-1-56700-482-3

4th Thermal and Fluids Engineering Conference
April, 14–17, 2019 , Las Vegas, NV, USA

PERFORMANCE ANALYSIS OF A HYBRID GROUND SOURCE HEAT PUMP SYSTEM WITH VARIOUS DIVERTER WATCH TEMPERATURES

Get access (open in a dialog) pages 1321-1330
DOI: 10.1615/TFEC2019.hbe.027346

Abstract

Energy consumption of residential and commercial buildings' heating, ventilation and air conditioning (HVAC) system is a long-running problem. Ground source heat pump (GSHP) system is one of the methods to reduce energy consumption. In GSHP systems, the storage capacity of soil layers is utilized to enhance system efficiency. A hybrid ground source heat pump system with liquid dry cooler served as a supplemental component was introduced and reported in a previous study. In this innovative system, the heat pump working fluid's flow direction switches between the ground heat exchanger and a liquid dry cooler according to the change of seasons. A new TRNSYS type which was written in C++ environment was developed in order to achieve the functionality of switching flow direction. Since the new type controls flow direction via a watch temperature, the temperature set point is the determining parameter which influences the system's overall performance. In this paper, a study on the effect of the diverter's watch temperature was carried out in TRNSYS. Several data sets from system modeling were collected and compared to optimize system's overall performance. The result shows that diverter's watch temperature not only affects the timing to switch flow direction between the ground heat exchanger and liquid dry cooler but also influences important system evaluation indexes, such as working fluid temperature or energy consumption. Applicable control strategies for Birmingham, AL area have been suggested as a result of this research.