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

2018 ◽  
Author(s):  
Yutaka Shoji ◽  
Takao Katsura ◽  
Takashi Higashitani ◽  
Katsunori Nagano ◽  
Yoshitaka Sakata
Keyword(s):  
Heat Pump ◽  
Simulation Tool ◽  
Ground Source Heat Pump ◽  
Ground Source

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

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4491
Author(s):  
Takao Katsura ◽  
Yoshitaka Sakata ◽  
Lan Ding ◽  
Katsunori Nagano
Keyword(s):  
Surface Temperature ◽  
Heat Pump ◽  
Ground Surface ◽  
Calculation Model ◽  
Outlet Temperature ◽  
Simulation Tool ◽  
Ground Source Heat Pump ◽  
Average Surface ◽  
Average Surface Temperature ◽  
Ground Source

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.

A design and simulation tool for ground source heat pump system using energy piles with large diameter

2019 ◽  
Vol 43 (4) ◽  
pp. 1505-1520 ◽  
Author(s):  
Takao Katsura ◽  
Katsunori Nagano ◽  
Yohitaka Sakata ◽  
Hisashi Wakayama
Keyword(s):  
Heat Pump ◽  
Large Diameter ◽  
Simulation Tool ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Energy Piles

A Model for Simulating the Performance of a Pavement Heating System as a Supplemental Heat Rejecter With Closed-Loop Ground-Source Heat Pump Systems

2000 ◽  
Vol 122 (4) ◽  
pp. 183-191 ◽  
Author(s):  
Andrew D. Chiasson ◽  
Jeffrey D. Spitler ◽  
Simon J. Rees ◽  
Marvin D. Smith
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Heat Conduction Equation ◽  
Closed Loop ◽  
Heating System ◽  
Simulation Tool ◽  
Ground Source Heat Pump ◽  
Heating Systems ◽  
Ground Source ◽  
Ground Loop

The thermal loads of commercial and institutional buildings are generally cooling-dominated. When such buildings use ground source heat pump systems (GSHP) they reject more heat to the ground-loop heat exchanger than they extract over the annual cycle. In these situations, supplemental heat rejecters can be used to reduce the required size of the ground-loop heat exchanger, thereby reducing the first cost of the system. This paper describes the development, validation, and use of a design and simulation tool for modeling the performance of a hydronic pavement heating system as a supplemental heat rejecter in ground-source heat pump systems. The model uses a finite difference method to solve the transient two-dimensional heat conduction equation and has been formulated for use in component based system simulation. Full-scale experiments were conducted concurrently with the development of the model, the results of which have been used for validation purposes. An example application simulation is presented to demonstrate the use of the model as well as the viability of the use of pavement heating systems as supplemental heat rejecters in GSHP systems. [S0199-6231(00)00404-4]

Performance analysis of photovoltaic-thermal road assisted ground source heat pump system during non-heating season

Solar Energy ◽  
2021 ◽  
Vol 221 ◽  
pp. 10-29
Author(s):  
Bo Xiang ◽  
Yasheng Ji ◽  
Yanping Yuan ◽  
Chao Zeng ◽  
Xiaoling Cao ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Heat Pump ◽  
Ground Source Heat Pump ◽  
Heating Season ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source

scholarly journals Profitability of Various Energy Supply Systems in Light of Their Different Energy Prices and Climate Conditions

Buildings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 100 ◽  
Author(s):  
Elaheh Jalilzadehazhari ◽  
Georgios Pardalis ◽  
Amir Vadiee
Keyword(s):  
Renewable Energy ◽  
Heat Pump ◽  
Energy Supply ◽  
Ground Source Heat Pump ◽  
Energy Prices ◽  
Single Family ◽  
Climate Zones ◽  
Ground Source ◽  
Supply Systems ◽  
Energy Supply Systems

The majority of the single-family houses in Sweden are affected by deteriorations in building envelopes as well as heating, ventilation and air conditioning systems. These dwellings are, therefore, in need of extensive renovation, which provides an excellent opportunity to install renewable energy supply systems to reduce the total energy consumption. The high investment costs of the renewable energy supply systems were previously distinguished as the main barrier in the installation of these systems in Sweden. House-owners should, therefore, compare the profitability of the energy supply systems and select the one, which will allow them to reduce their operational costs. This study analyses the profitability of a ground source heat pump, photovoltaic solar panels and an integrated ground source heat pump with a photovoltaic system, as three energy supply systems for a single-family house in Sweden. The profitability of the supply systems was analysed by calculating the payback period (PBP) and internal rate of return (IRR) for these systems. Three different energy prices, three different interest rates, and two different lifespans were considered when calculating the IRR and PBP. In addition, the profitability of the supply systems was analysed for four Swedish climate zones. The analyses of results show that the ground source heat pump system was the most profitable energy supply system since it provided a short PBP and high IRR in all climate zones when compared with the other energy supply systems. Additionally, results show that increasing the energy price improved the profitability of the supply systems in all climate zones.

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