| Keywords |
Ground source heat pump system ; Operation characteristics ; Energy performance ; Empirical evaluation ; Summer season |
| Abstract |
To spread the application of ground source heat pump (GSHP) systems, this paper carried out empirical evaluation of operation characteristics and energy performance of the GSHP system. The GSHP considered in this study has a cooling capacity of 89.7kW and a heating capacity of 93.5kW, and coefficient of performance (COP) in cooling mode of 4.7 and COP in heating mode of 3.5. From the monitoring results in summer season, it was observed that average daily temperatures of liquid entering the load side of the GSHP were measured to be 9.5oC, 8.7oC and 10.1oC in typical day from June to August that were sufficient to ensure proper cooling to the building. In the same days, average daily temperatures of liquid entering the source side of the GSHP were measured to be 17.56oC, 20.1oC and 21.5oC. Although the temperature was increased about 4oC due to the continued cooling operation of approximately 3 months, it was still lower than 25oC generally evaluated as stable operation condition in cooling mode. In addition, it was found that the GSHP system shows a high energy performance because average COP and system COP for analysis period were computed at 7.1 and 4.4 higher than the nominal value, respectively. |