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Energies 2016, 9(1), 4; doi:10.3390/en9010004

A Numerical Study on System Performance of Groundwater Heat Pumps

1
Blue Economy Strategy Institute, Suite 911, 55 Digital-Ro 34-Gil, Seoul 08378, Korea
2
Department of Architectural Engineering, Pusan National University, Jangjun-2 Dong, Busan 609-735, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Vincent Lemort and Samuel Gendebien
Received: 14 August 2015 / Revised: 8 December 2015 / Accepted: 17 December 2015 / Published: 23 December 2015
(This article belongs to the Special Issue Advanced Heating and Cooling Techniques)
View Full-Text   |   Download PDF [3386 KB, uploaded 24 December 2015]   |  

Abstract

Groundwater heat pumps have energy saving potential where the groundwater resources are sufficient. System Coefficients of Performance (COPs) are measurements of performance of groundwater heat pump systems. In this study, the head and power of submersible pumps, heat pump units, piping, and heat exchangers are expressed as polynomial equations, and these equations are solved numerically to determine the system performance. Regression analysis is used to find the coefficients of the polynomial equations from a catalog of performance data. The cooling and heating capacities of water-to-water heat pumps are determined using Energy Plus. Results show that system performance drops as the water level drops, and the lowest flow rates generally achieve the highest system performance. The system COPs are used to compare the system performance of various system configurations. The groundwater pumping level and temperature provide the greatest effects on the system performance of groundwater heat pumps along with the submersible pumps and heat exchangers. The effects of groundwater pumping levels, groundwater temperatures, and the heat transfer coefficient in heat exchanger on the system performance are given and compared. This analysis needs to be included in the design process of groundwater heat pump systems, possibly with analysis tools that include a wide range of performance data. View Full-Text
Keywords: groundwater heat pump; coefficient of performance; regression analysis; UA value; heat exchanger groundwater heat pump; coefficient of performance; regression analysis; UA value; heat exchanger
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kim, J.; Nam, Y. A Numerical Study on System Performance of Groundwater Heat Pumps. Energies 2016, 9, 4.

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