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Technical Briefs

# Design and Performance of a Constant Temperature and Humidity Air-Conditioning System Driven by a Ground Source Heat Pump in Summer

[+] Author and Article Information
X. Yu

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, Chinayuxty@sjtu.edu.cn

X. Q. Zhai

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, Chinaxqzhai@sjtu.edu.cn

R. Z. Wang1

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, Chinarzwang@sjtu.edu.cn

1

Corresponding author.

J. Thermal Sci. Eng. Appl 2(1), 014502 (Sep 08, 2010) (6 pages) doi:10.1115/1.4002300 History: Received November 08, 2009; Revised June 21, 2010; Published September 08, 2010; Online September 08, 2010

## Abstract

A constant temperature and humidity air-conditioning system driven by a ground source heat pump was designed and constructed in an archives building in Shanghai. The system consists of a water-to-water heat pump and 280 boreholes with 80 m in depth. During the operation in summer, the heat extraction from the condenser of the heat pump was divided: Part was rejected to the soil, while another was used to reheat the air in air handling units (AHUs). According to the experimental results under a typical summer weather condition of Shanghai, the average coefficient of performance of the heat pump was 5.4. The average indoor temperature and relative humidity of the archives house were $22.8°C$ and 46.6%, respectively. Since part of the heat extraction from the condenser was used to reheat the air in AHUs, the heat rejected to the soil was reduced by 23%, which was helpful for the earth energy conservation. According to the theoretical analysis, the distance between two boreholes is suggested to be 4–5 m. The deepness of the boreholes is suggested to be 80–100 m in Shanghai.

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## Figures

Figure 1

The appearance of building

Figure 2

Flow diagram of the system working in summer

Figure 3

The scheme of the AHU

Figure 4

Schematic diagram of the theoretical model

Figure 5

Variations in ambient temperature and relative humidity

Figure 6

Variations in inlet and outlet temperatures of the evaporator

Figure 7

Variation in the cooling capacity of the heat pump

Figure 8

Variations in the inlet and outlet temperatures of the condenser

Figure 9

Variations in the inlet and outlet temperatures of the underground heat exchanger

Figure 10

Heat exchanged of the condenser, the AHUs, and the underground heat exchanger

Figure 11

Variations in temperature and relative humidity in an archives house

Figure 12

(a) Temperature distribution of the soil around the U-tube with reheating. (b) Temperature distribution of the soil around the U-tube without reheating.

Figure 13

Variations in temperature of soil in the middle of two boreholes and the COP of heat pump with the distance between two boreholes

Figure 14

Variation in the COP of heat pump with the deepness of the boreholes

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