The Experts below are selected from a list of 84 Experts worldwide ranked by ideXlab platform
Tao Yang - One of the best experts on this subject based on the ideXlab platform.
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experimental study of a solar assisted ground coupled heat pump system with solar Seasonal Thermal Storage in severe cold areas
Energy and Buildings, 2010Co-Authors: Xiao Wang, Maoyu Zheng, Wenyong Zhang, Shu Zhang, Tao YangAbstract:Abstract This paper presents the experimental study of a solar-assisted ground-coupled heat pump system (SAGCHPS) with solar Seasonal Thermal Storage installed in a detached house in Harbin. The solar Seasonal Thermal Storage was conducted throughout the non-heating seasons. In summer, the soil was used as the heat sink to cool the building directly. In winter, the solar energy was used as a priority, and the building was heated by a ground-coupled heat pump (GCHP) and solar collectors alternately. The results show that the system can meet the heating–cooling energy needs of the building. In the heating mode, the heat directly supplied by solar collectors accounted for 49.7% of the total heating output, and the average coefficient of performance (COP) of the heat pump and the system were 4.29 and 6.55, respectively. In the cooling mode, the COP of the system reached 21.35, as the heat pump was not necessary to be started. After a year of operation, the heat extracted from the soil by the heat pump accounted for 75.5% of the heat stored by solar Seasonal Thermal Storage. The excess heat raised the soil temperature to a higher level, which was favorable for increasing the COP of the heat pump.
Jarek Kurnitski - One of the best experts on this subject based on the ideXlab platform.
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geoThermal energy piles and boreholes design with heat pump in a whole building simulation software
Energy and Buildings, 2015Co-Authors: Jevgeni Fadejev, Jarek KurnitskiAbstract:Abstract With growing demand in improving building's energy efficiency, utilization of energy from renewable sources, such as ground energy, becomes more common. This paper focuses on the detailed modelling issues in a whole building simulation environment providing an approach for a design of a heat pump plant with boreholes or energy piles, that was developed for a case of one storey commercial hall building. Modelling was performed in whole building simulation software IDA-ICE, where most of the modelled components were defined as manufacturer specific products. Recently developed three dimensional borehole model was validated with the use of actual borehole measurement data. Heat pump model calibration parameters equations, which are needed to setup model according to manufacturer specific performance map product data, were derived and applied. According to results of conducted 20-years long-term simulations, consideration of Seasonal Thermal Storage can become feasible. Validation of borehole model showed that the model can simulate very accurate dynamic performance and is highly suitable for coupling with dynamic plant models. Different ground surfaces boundary conditions of geoThermal energy piles and field of boreholes resulted in 23% more efficient performance of energy piles in the case of the same field configuration.
Xianting Li - One of the best experts on this subject based on the ideXlab platform.
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a new solution for underground Thermal imbalance of ground coupled heat pump systems in cold regions heat compensation unit with thermosyphon
Applied Thermal Engineering, 2014Co-Authors: Baolong Wang, Wei Wu, Xianting LiAbstract:Abstract Ground-coupled heat pump systems (GCHPs) are environmentally friendly and energy-saving heating and cooling sources that are widely applied in recent years. However, for heating-dominant buildings in cold regions, more heat is extracted from the ground than is rejected, which leads to yearly decrease in soil temperature and degradation of the GCHP's heating performance and even results in GCHP failure after long-term operation. To solve this problem, a novel heat compensation unit with thermosyphon (HCUT) is proposed. The HCUT combines an air-source thermosyphon and an air-source heat pump to transfer heat from ambient air into the ground during the non-heating season as Seasonal Thermal Storage and to recover the soil temperature. To investigate its long-term operation performance, a multi-year simulation was conducted in Harbin (one of the coldest cities in China) by TRNSYS, and the performance of the novel system is compared with the traditional “boiler + split air-conditioner” system. The results indicate that HCUT can effectively eliminate the underground Thermal imbalance in cold regions, while ensuring that the GCHP system continues to work efficiently without performance deterioration and strengthening the heating reliability. Additionally, the novel system can save approximately 15% in energy compared with the traditional system. Thus, the HCUT is a potential solution for the underground Thermal imbalance of GCHP systems in cold regions.
Xiaobei Song - One of the best experts on this subject based on the ideXlab platform.
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simulation of a multi source hybrid heat pump system with Seasonal Thermal Storage in cold regions
Applied Thermal Engineering, 2017Co-Authors: Xiaobei SongAbstract:Abstract Based on taking full account of the building load and renewable energy output characteristics in cold regions, a multi-source hybrid heat pump system (MSHHPS) with Seasonal Thermal Storage was proposed. The Seasonal Thermal Storage comprehensively utilized solar energy, geoThermal energy and air energy. The composition and operation modes of the system were introduced. The mathematical model of the main parts of the proposed system was established. The transition condition of the different operating modes of the system was determined. Taking a building in Harbin as the object for simulation analysis, the operation effect and the change of the soil temperature field of the system were obtained. The results showed that: The average coefficient of performance ( COP ) of the MSHHPS with Seasonal Thermal Storage was 3.06 (in the Harbin region for 10 years), the soil Thermal balance rate was 100.33% and the energy-saving rate was 29.84% comparing to the ground source heat pump system (GSHPS). For the initial investment, MSHHPS only required additional double-source heat pump unit, which accounted at 9.59%. The static payback period of the double-source heat pump unit was 4 years. The system can maintain efficient and economical operation in the typical cold regions.
Xiao Wang - One of the best experts on this subject based on the ideXlab platform.
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experimental study of a solar assisted ground coupled heat pump system with solar Seasonal Thermal Storage in severe cold areas
Energy and Buildings, 2010Co-Authors: Xiao Wang, Maoyu Zheng, Wenyong Zhang, Shu Zhang, Tao YangAbstract:Abstract This paper presents the experimental study of a solar-assisted ground-coupled heat pump system (SAGCHPS) with solar Seasonal Thermal Storage installed in a detached house in Harbin. The solar Seasonal Thermal Storage was conducted throughout the non-heating seasons. In summer, the soil was used as the heat sink to cool the building directly. In winter, the solar energy was used as a priority, and the building was heated by a ground-coupled heat pump (GCHP) and solar collectors alternately. The results show that the system can meet the heating–cooling energy needs of the building. In the heating mode, the heat directly supplied by solar collectors accounted for 49.7% of the total heating output, and the average coefficient of performance (COP) of the heat pump and the system were 4.29 and 6.55, respectively. In the cooling mode, the COP of the system reached 21.35, as the heat pump was not necessary to be started. After a year of operation, the heat extracted from the soil by the heat pump accounted for 75.5% of the heat stored by solar Seasonal Thermal Storage. The excess heat raised the soil temperature to a higher level, which was favorable for increasing the COP of the heat pump.
