New medium-low temperature hydrothermal geothermal district heating system based on distributed electric compression heat pumps and a centralized absorption heat transformer

Sun, Fengrui; Hao, Baoru; Fu, Lin; Wu, Hongwei; Xie, Yonghua; Wu, Haifeng

doi:10.1016/j.energy.2021.120974

Cited by 21 publications

(3 citation statements)

References 33 publications

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“…Hydrothermal geothermal energy (underground hot water) is a middle to deep geothermal resource that is found deeper than shallow geothermal energy. 16 , 17 The quantity of resources usually needs to be evaluated by geophysical well logging data to determine whether the resources have exploitation value. Underground hot water with different temperatures has different utilization modalities 13 , 18 , 19 : the underground hot water temperature greater 92°C, it can be used for geothermal power generation; that is, geothermal water is put through the flash evaporator to generate steam and then propel a steam turbine for power generation to provide electricity for residents; for temperature in the range of 75°C to 92°C, it can be used for geothermal refrigeration; for the temperature in the range of 55°C to 70°C, it can be used for geothermal drying; and for the temperature in the range of 35°C to 55°C, it can be used for geothermal heating and geothermal bathing.…”

Section: Characteristics Of Geothermal Energymentioning

confidence: 99%

Application of well logging technology in geothermal resource evaluation: A case study of geothermal water wells in the Qianjiang sag, Jianghan Basin

Shi

Huang

et al. 2023

Science Progress

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Geothermal resources are green and environmentally friendly renewable energy. An accurate evaluation of geothermal resources will help subsequent efficient exploitation. However, to save costs and improve efficiency, core-free drilling and without mud logging are adopted in the actual exploration, which results in an inability to directly obtain the relevant evaluation parameters of a geothermal reservoir for exploration and evaluation. Well logging technology can effectively delineate the geothermal reservoir and determine the location of the major aquifer, while also allowing for the accurate measurement of key reservoir evaluation parameters, such as the shale content, porosity, and well temperature. Moreover, coupled with the calculated logging parameters, a volumetric method can be used to determine the regional geothermal reserves. This research takes the geothermal wells of the Guanghuasi Formation in the Qianjiang sag, Jianghan Basin as an example to conduct the application research. The findings can be of reference for similar geothermal wells in China and facilitate the development of “carbon neutrality.”

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Section: Characteristics Of Geothermal Energymentioning

confidence: 99%

Application of well logging technology in geothermal resource evaluation: A case study of geothermal water wells in the Qianjiang sag, Jianghan Basin

Shi

Huang

et al. 2023

Science Progress

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“…Thus, the influence of variables of systems was determined economically and thermodynamically by employing the non-dominated sort of genetic algorithm-II (NSGA-II) technique. Sun et al [12] conducted the thermodynamic analysis of a new medium-low temperature hydrothermal geothermal district heating system based on heat pumps and an AHT. The results revealed that the centralized AHT can improve the performance of HPs and reduce irreversible loss of the heating station.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Economic Analysis of Innovative Integrated Power Cycles for Low-Temperature Heat Sources Based on Heat Transformer

2022

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This paper proposes two novel integrated power cycles as appropriate systems for low-temperature heat sources. The proposed cycles encompass an absorption heat transformer (AHT) system to convert low-temperature heat source to high-temperature source and supply the required heat for driving Kalina cycle (KC) and absorption power cycle (APC) as bottoming cycles. A comprehensive simulation of the system is presented based on the thermo-economic viewpoint. The results show that the AHT/KC has higher energy and exergy efficiencies than the AHT/APC, with 7.69% and 49.03%, respectively. In addition, the sum unit cost of the product (SUCP) for the system is calculated 87.72 $/GJ. According to the results, throttle valve 1 and absorber 1 are the most destructive components of the AHT/KC and AHT/APC, respectively. The net output power in the AHT/KC and the AHT/APC is assessed 60.06 kW and 34.86 kW, respectively. The circulation rate (CR), Coefficient of performance (COP), and exergetic coefficient of performance (ECOP) for both cycles are 3.819, 0.4108, and 0.6107, respectively. The study of key parameters demonstrates that the energetic performance of the proposed power cycles increases and decreases by a rise in the temperature of the generator and condenser, respectively. From the exergetic perspective, rising temperature of the generator improves the efficiency of the cycles, while increasing the ammonia concentration as well as condenser and absorber temperatures reduce the exergy efficiency.

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“…They obtained that the proposed model reduces the payback period while improving the COP considerably. In another work, Sun et al [22] proposed a new scheme to improve a heat pump-driven system's performance and economic benefits interacting with a centralized absorption chiller and district heating network. Their scheme resulted in higher exergy efficiency and lower levelized energy costs.…”

Section: Introductionmentioning

confidence: 99%

Design and Parametric Investigation of an Efficient Heating System, an Effort to Obtain a Higher Seasonal Performance Factor

2021

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The present work introduces an innovative yet feasible heating system consisting of a ground source heat pump, borehole thermal energy storage, an auxiliary heater, radiators, and ventilation coils. The concept is developed by designing a new piping configuration monitored by a smart control system to reduce the return flow temperature and increase the temperature differential between the supply and return flows. The radiators and ventilation heating circuits are connected in series to provide the heat loads with the same demand. The investigation of the proposed model is performed through developed Python code considering a case study hospital located in Norway. The article presents, after validation of the primary heating system installed in the hospital, a parametric investigation to evaluate the effect of main operational parameters on the performance metrics of both the heat pump and the total system. According to the results, the evaporator temperature is a significant parameter that considerably impacts the system performance. The parametric study findings show that the heat pumps with a thermal capacity of 400 kW and 600 kW lead to the highest heat pump and total seasonal performance factors, respectively. It is also observed that increasing the heat pump capacity does not affect the performance indicators when the condensation temperature is 40 °C and the heat recovery is 50%. Moreover, choosing a heat pump with a smaller capacity at the heat recovery of 75% (or higher) would be an appropriate option because the seasonal performance values are not varied by changing the heat pump capacity. The results reveal that reducing return temperature under a proper parameters selection results in substantially higher seasonal performance factors of the heat pump and total system. These outcomes are in-line with the United Nations sustainable development goals including Sustainable Cities and Communities.

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New medium-low temperature hydrothermal geothermal district heating system based on distributed electric compression heat pumps and a centralized absorption heat transformer

Cited by 21 publications

References 33 publications

Application of well logging technology in geothermal resource evaluation: A case study of geothermal water wells in the Qianjiang sag, Jianghan Basin

Application of well logging technology in geothermal resource evaluation: A case study of geothermal water wells in the Qianjiang sag, Jianghan Basin

Thermo-Economic Analysis of Innovative Integrated Power Cycles for Low-Temperature Heat Sources Based on Heat Transformer

Design and Parametric Investigation of an Efficient Heating System, an Effort to Obtain a Higher Seasonal Performance Factor

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