Development of Simulation Tool for Ground Source Heat Pump Systems Influenced by Ground Surface

The authors developed a ground heat exchanger (GHE) calculation model influenced by the ground surface by applying the superposition theorem. Furthermore, a simulation tool for ground source heat pump (GSHP) systems affected by ground surface was developed by combining the GHE calculation model with the simulation tool for GSHP systems that the authors previously developed. In this paper, the outlines of GHE calculation model is explained. Next, in order to validate the calculation precision of the tool, a thermal response test (TRT) was carried out using a borehole GHE with a length of 30 m and the outlet temperature of the GHE calculated using the tool was compared to the measured one. The relative error between the temperatures of the heat carrier fluid in the GHE obtained by measurement and calculation was 3.3% and this result indicated that the tool can reproduce the measurement with acceptable precision. In addition, the authors assumed that the GSHP system was installed in residential houses and predicted the performances of GSHP systems using the GHEs with different lengths and numbers, but the same total length. The result showed that the average surface temperature of GHE with a length of 10 m becomes approximately 2 °C higher than the average surface temperature of a GHE with a length of 100 m in August.

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Intelligent Calculation Model and Algorithm Optimization of Optimal Operation of Integrated Energy System

Journal of Physics Conference Series ◽

10.1088/1742-6596/2083/3/032033 ◽

2021 ◽

Vol 2083 (3) ◽

pp. 032033

Author(s):

Kun Wang ◽

Guochao Yang ◽

Baohua Cheng ◽

Zhiyong Gan ◽

Yan Qi ◽

...

Keyword(s):

Energy Saving ◽

Heat Pump ◽

Energy System ◽

Calculation Model ◽

Optimal Operation ◽

Ground Source Heat Pump ◽

Pump System ◽

Heat Pump System ◽

Ground Source ◽

Saving Effect

Abstract This paper analyzes the energy saving effect and optimal operation of the integrated park type energy system. The park type integrated energy system includes photovoltaic power generation system, ground source heat pump system, solar air conditioning system, regenerative electric boiler system and solar hot water system and so on. The energy saving benefit calculation model of each subsystem is established, and according to the operation history data of each subsystem, the calculation results of each subsystem are analyzed. It shows that: The energy saving income of photovoltaic power generation system is 734,200 yuan/year. The main revenue comes from the second and third quarters, during which it should pay attention to the maintenance of photovoltaic modules to ensure the maximum energy saving benefit. The energy saving income of ground source heat pump system in summer is 155,900 yuan/year, and the energy saving effect is not significant. It can cooperate with traditional units for cooling in summer. The heating in winter in the park is provided by ground source heat pump system, regenerative electric boiler system and solar energy air conditioning system. Its energy saving benefit is 3.995 million yuan/year which is the main source of energy saving income in the park, with remarkable energy saving effect.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.724-725.909 ◽

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.

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Comparative study on thermal performance of horizontal ground source heat pump systems with Dirichlet and Robin boundary conditions on ground surface

Energy Conversion and Management ◽

10.1016/j.enconman.2020.113469 ◽

2020 ◽

Vol 225 ◽

pp. 113469

Author(s):

Kun Zhou ◽

Jinfeng Mao ◽

Yong Li ◽

Zhang Hua

Keyword(s):

Boundary Conditions ◽

Comparative Study ◽

Heat Pump ◽

Thermal Performance ◽

Ground Surface ◽

Robin Boundary Conditions ◽

Ground Source Heat Pump ◽

Ground Source ◽

Robin Boundary

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Numerical Simulations of a Ground Source Heat Pump System With Pile Heat Exchangers

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4028343 ◽

2014 ◽

Vol 7 (1) ◽

Cited By ~ 1

Author(s):

Masahito Oguma ◽

Takeshi Matsumoto ◽

Takao Kakizaki

Keyword(s):

Numerical Simulation ◽

Numerical Simulations ◽

Heat Pump ◽

Heat Exchangers ◽

Heat Supply ◽

Ground Surface ◽

Ground Source Heat Pump ◽

Pump System ◽

Heat Pump System ◽

Ground Source

Feasibility of a ground source heat pump (GSHP) system with pile heat exchangers for use in houses is evaluated through a numerical simulation. This GSHP system differs from ordinary borehole-type GSHP systems because short foundation piles installed at close intervals are used as heat exchangers. It is shown that the annual heat supply provided by this GSHP system is able to satisfy the demand of a house due to the air-source exchange at ground surface.

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Design and simulation tool for ground source heat pump systems considering groundwater advection

10.22488/okstate.18.000046 ◽

2018 ◽

Cited By ~ 1

Author(s):

Yutaka Shoji ◽

Takao Katsura ◽

Takashi Higashitani ◽

Katsunori Nagano ◽

Yoshitaka Sakata

Keyword(s):

Heat Pump ◽

Simulation Tool ◽

Ground Source Heat Pump ◽

Ground Source

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Evaluating the Thermal Performance of Wet Swales Housing Ground Source Heat Pump Elements through Laboratory Modelling

Sustainability ◽

10.3390/su11113118 ◽

2019 ◽

Vol 11 (11) ◽

pp. 3118 ◽

Cited By ~ 3

Author(s):

Carlos Rey-Mahía ◽

Luis A. Sañudo-Fontaneda ◽

Valerio C. Andrés-Valeri ◽

Felipe Pedro Álvarez-Rabanal ◽

Stephen John Coupe ◽

...

Keyword(s):

Heat Pump ◽

Thermal Performance ◽

Urban Drainage ◽

Outlet Temperature ◽

Ground Source Heat Pump ◽

Rapid Urbanization ◽

Drainage Systems ◽

Ground Source ◽

Urban Drainage Systems ◽

The Impact

Land-use change due to rapid urbanization poses a threat to urban environments, which are in need of multifunctional green solutions to face complex future socio-ecological and climate scenarios. Urban regeneration strategies, bringing green infrastructure, are currently using sustainable urban drainage systems to exploit the provision of ecosystem services and their wider benefits. The link between food, energy and water depicts a technological knowledge gap, represented by previous attempts to investigate the combination between ground source heat pump and permeable pavement systems. This research aims to transfer these concepts into greener sustainable urban drainage systems like wet swales. A 1:2 scaled laboratory models were built and analysed under a range of ground source heat pump temperatures (20–50 °C). Behavioral models of vertical and inlet/outlet temperature difference within the system were developed, achieving high R2, representing the first attempt to describe the thermal performance of wet swales in literature when designed alongside ground source heat pump elements. Statistical analyses showed the impact of ambient temperature and the heating source at different scales in all layers, as well as, the resilience to heating processes, recovering their initial thermal state within 16 h after the heating stage.

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Numerical Simulation of Solar Ground-Source Heat Pump with Latent Heat Storage

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.129-131.1069 ◽

2010 ◽

Vol 129-131 ◽

pp. 1069-1073 ◽

Cited By ~ 4

Author(s):

Fang Wang ◽

Zhi Long Liu ◽

Zhong Jian Li ◽

Mao Yu Zheng

Keyword(s):

Experimental Data ◽

Phase Change ◽

Latent Heat ◽

Heat Pump ◽

Heat Storage ◽

Numerical Results ◽

Outlet Temperature ◽

Ground Source Heat Pump ◽

Latent Heat Storage ◽

Ground Source

Solar ground-source heat pump (SGSHP) system is unsteady when used to heating. Latent heat storage tank (LHST) was used appropriately in which phase change material (PCM) - CaCl2•6H2O was encapsulated in plastic kegs setting on the serpentine coil. PCM which was as controlling unit of the phase change heat transfer model were solved numerically by an enthalpy-based finite differences method and was validated by experimental data. In order to reflect the effect of the system, two days were chosen to compare the numerical results with experimental data. Inlet and outlet temperature of the water in the LHST, temperature of PCM and storage & emission heat of LHST were measured. The trends of the variation of numerical results and experimental data were in close agreement. Numerical results can reflect the operation mode of the system very well.

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Heat Transfer Characteristics and Loading Performance of Ground-Source Heat Pump System Pile

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.454.190 ◽

2013 ◽

Vol 454 ◽

pp. 190-193

Author(s):

Meng Yu Zhang ◽

Wan Qing Zhou ◽

Feng Qi Gao

Keyword(s):

Bearing Capacity ◽

Heat Pump ◽

Ground Surface ◽

Social Progress ◽

Energy Structure ◽

Ground Source Heat Pump ◽

Pump System ◽

Buried Pipes ◽

Heat Pump System ◽

Ground Source

Energy is the material basis for human survival, economic development, and the social progress. With the growth of population and the improvement of per capita living standards in developing countries, energy becomes scarce. To improve the energy structure and seek sufficient stability in energy supplies has become issues of concern. Ground source heat just to meet the people's demand for energy, ground surface of shallow geothermal energy is a renewable energy stored. The ground source heat pump system pile are caring for two aspects: whether the pipes will influence the bearing capacity of the pile and whether the deformations of the pile will influence the buried pipes．In this paper, the bearing capacity influenced by the buried pipes is analyzed through the variation of the moment of inertia and the area of the pile．The results show that the buried pipes in the pile have little influence on the structures．

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Optimization of ground heat exchanger of the ground source heat pump system based on exergetic analysis using Taguchi technique

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406221991183 ◽

2021 ◽

pp. 095440622199118

Author(s):

Saif Nawaz Ahmad ◽

Om Prakash

Keyword(s):

Heat Exchanger ◽

Heat Pump ◽

Inlet Temperature ◽

Outlet Temperature ◽

Ground Heat Exchanger ◽

Ground Source Heat Pump ◽

Pump System ◽

Heat Pump System ◽

Ground Source ◽

Exergetic Analysis

The present research work focuses on the optimization of the ground heat exchanger of the Ground source heat pump system for heating application based on exergetic analysis using the Taguchi method. For this work, we select four influencing factors such as the mass flow rate of water (A), the specific heat of water (B), inlet temperature (C) of water to and outlet temperature of water (D) from the ground heat exchanger at three levels. An L9 orthogonal array was selected for experimental trials and in each trial, we calculate the exergy destruction for the ground heat exchanger, thereafter using statistical software Minitab, we get signal to noise ratios based on smaller is better criterion. After analyzing the response table of Taguchi results, we get the optimum level of all the factors. The ANOVA technique was also applied for getting the most significant factors which affect the output results by calculating the percentage contribution of each factor. According to our results, the best combination of all the four factors for exergetic destruction of the ground heat exchanger was A3B1C1D3 and the most influencing factor was inlet water temperature with a contribution factor of 56.03%.

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