Performance optimization of a hybrid ground source heat pump with the parallel configuration of a ground heat exchanger and a supplemental heat rejecter in the cooling mode

2012 ◽  
Vol 35 (6) ◽  
pp. 1537-1546 ◽  
Author(s):  
Honghee Park ◽  
Joo Seoung Lee ◽  
Wonuk Kim ◽  
Yongchan Kim
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Performance Optimization ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Cooling Mode ◽  
Ground Source ◽  
Parallel Configuration

Performance Evaluation of a Vertical U-Tube Ground Heat Exchanger Using a Numerical Simulation Approach

2013 ◽  
Vol 724-725 ◽  
pp. 909-915
Author(s):  
Ping Fang Hu ◽  
Zhong Yi Yu ◽  
Fei Lei ◽  
Na Zhu ◽  
Qi Ming Sun ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Performance Evaluation ◽  
Heat Exchanger ◽  
Heat Pump ◽  
Heat Transfer Process ◽  
Working Fluid ◽  
Outlet Temperature ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Ground Source

A vertical U-tube ground heat exchanger can be utilized to exchange heat with the soil in ground source heat pump systems. The outlet temperature of the working fluid through the U-tube not only accounts for heat transfer capacity of a ground heat exchanger, but also greatly affects the operational efficiency of heat pump units, which is an important characteristic parameter of heat transfer process. It is quantified by defining a thermal effectiveness coefficient. The performance evaluation is performed with a three dimensional numerical model using a finite volume technique. A dynamic simulation was conducted to analyze the thermal effectiveness as a function of soil thermal properties, backfill material properties, separation distance between the two tube legs, borehole depth and flow velocity of the working fluid. The influence of important characteristic parameters on the heat transfer performance of vertical U-tube ground heat exchangers is investigated, which may provide the references for the design of ground source heat pump systems in practice.

Simulation on Ground Temperature Change of GSHP System in Severe Cold Regions

2014 ◽  
Vol 945-949 ◽  
pp. 2820-2824 ◽  
Author(s):  
Li Bai ◽  
Peng Xuan Wang
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Temperature Change ◽  
Heat Pump ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Cold Regions ◽  
Ground Source ◽  
Ground Coupled Heat Pump ◽  
Operation And Management

For the case of ground-source heat pump in severe cold regions in winter, the heat transfer situation of the ground and ground heat exchanger was dynamically simulated according to the statistics of a project in Changchun to analysis the change of the ground heat, which provided references for the initial design and operation and management of the ground-coupled heat pump in severe cold regions.

scholarly journals Experiments Using Capillary Mat as Ground Heat Exchanger for Ground Source Heat Pump Heating Application

2019 ◽  
Vol 11 (11) ◽  
pp. 363-378
Author(s):  
Arif Widiatmojo ◽  
Shrestha Gaurav ◽  
Takeshi Ishihara ◽  
Akira Tomigashi ◽  
Kasumi Yasukawa ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Ground Source

Efficiency Analysis of Series Connection Ground Source Heat Pump Water Chiller-Heater Unit

2014 ◽  
Vol 529 ◽  
pp. 625-629
Author(s):  
Chao Yi Tan ◽  
Peng Fei Yang ◽  
Meng Meng Wang ◽  
Hai Hua Hu ◽  
Guo Qiang Zhang
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Pump ◽  
Hot Water ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Heat Transfer Area ◽  
Pump System ◽  
Series Connection ◽  
Ground Source

In order to improve EER of the ground source heat pump system and reduce heat transfer area of the ground heat exchanger, the authors had developed a series connection ground source heat pump water chiller-heater unit, after theoretical analyses, proved that placing the water chilled in front of the hot water unit could acquire a higher EER comparing to the opposite. In the meantime, this unit had a higher EER than a common water chiller-heater unit or a water chiller-heater unit with condensing heat recovery device. In an air conditioning system of ground source heat pump, employing the above mentioned unit can also reduce heat transfer area of the ground heat exchanger. It suggested that series connection ground source heat pump water chiller-heater unit is a kind of technology with a great development potential.

scholarly journals The Solar-Assisted Vertical Ground Source Heat Pump System in Cold Climates—A Case Study

Proceedings ◽  
2020 ◽  
Vol 51 (1) ◽  
pp. 24
Author(s):  
Piotr Rynkowski
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Solar Collector ◽  
Heat Extraction ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Vertical Ground

In this paper, experimental studies were performed for a solar ground source heat pump system (SGSHPS) with a vertical ground heat exchanger (VGHE). The experiment was operated during the summer in 2018. The heat from the solar collector was monitored by measuring the inlet and outlet temperatures and flow rate of the heat transfer fluids. An energy equilibrium balance carried out indicates heat extraction from the solar collector to the ground heat exchanger. It has been established that clear impact is achieved within a radius of 5 m. The average temperature of the actively regenerated borehole was higher than that of the undisturbed profile, which has a direct impact on the significant benefits of the coefficient of performance (COP) of the ground source heat pump system (GSHPS) and effectively helps soil regeneration. The average efficiency ratio of the heat transferred from solar radiation to soil in the SGSHPS was 42.3%.

The Numerical Simulation of Ground Source Heat Pump

2012 ◽  
Vol 608-609 ◽  
pp. 979-982
Author(s):  
Jian Zhang ◽  
Ling Wang
Keyword(s):  
Numerical Simulation ◽  
Heat Exchanger ◽  
Heat Pump ◽  
Temperature Difference ◽  
Ground Heat Exchanger ◽  
Three Dimension ◽  
Ground Source Heat Pump ◽  
Ground Source ◽  
Set Up

Set up the three dimension model of ground heat exchanger, consider the temperature variety between inlet and outlet, at the same make the zone into two parts. Use the fluent to slove it . The results prove that because of the temperature difference between inlet and outlet, the temperature approach inlet varies serious than that approach outlet. With the depth increasing, the temperature difference would be little, but the center temperature is high.

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