Theoretical and numerical study on performance of the air-source heat pump system in Tibet

Li, Wuyan; Liu, Zongsheng; Lü, Jun; Zeng, Liyue; Yang, Lulu; Xie, Ling

doi:10.1016/j.renene.2017.07.036

Cited by 20 publications

(4 citation statements)

References 19 publications

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“…In addition, the system can charge the soil storage medium in summer months, when excess electric power was generated [16]. Li et al [17] presented a numerical model to predict the performance of a typical ASHP system in the capital of Tibet in China. The theoretical analysis indicates that the low relative humidity can improve the performance of the ASHP system, while the occurrence of frost is hard to find on an air-side heat exchanger.…”

Section: Of 18mentioning

confidence: 99%

Experimental Study on the Performance of a Household Dual-Source Heat Pump Water Heater

Gou

Liu

et al. 2018

Energies

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A household dual source heat pump water heater is proposed to utilize the energy of wastewater and air heat in a bathroom. The heat pump system integrates a wastewater source heat pump (WSHP), air source heat pump (ASHP), and a preheater. This aims at energy saving through recovering the heat of wastewater and ventilation air during the bathing process. The experiment was conducted to verify the feasibility of a dual heat source heat pump water heater system in a bath unit. It is found that the system can achieve an average coefficient of performance (COP) of 4.80 and 4.38 with and without preheater, respectively. At a bath water temperature of 40 °C, a flow rate of 6 L/min, and a room temperature of 26.5 °C, the COP of system can reach 6.08, which shows a significantly promising method for energy saving in-house.

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Section: Of 18mentioning

confidence: 99%

Experimental Study on the Performance of a Household Dual-Source Heat Pump Water Heater

Gou

Liu

et al. 2018

Energies

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“…Li et al performed a theoretical and numerical study on ASHP performance in Tibet. They determined that the COP increased from 1.76 to 2.87 when the ambient temperature varied from −12 to 10 • C. In addition, the low air pressure impact was also evaluated [21]. Wei et al analysed ASHP for district heating purposes.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Frost Formation Influence on an Air Source Heat Pump Evaporator

2021

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The application of heat pumps in the heating systems of buildings in the cold or transitional season is becoming an increasingly common practice not only in Lithuania but in other countries as well. Due to the growing popularity of air-to-air or air-to-water heat pumps in the building sector, the problem of the evaporator heat exchanger freezing is also becoming more and more relevant. As the outdoor temperature drops, so does the heat pump’s coefficient of performance (COP) for heating. The freezing of the evaporator surface increases the energy consumption of the system, has a negative effect on heat exchange, distorts the normal operating cycle of the heat pump and the energy is wasted for defrosting processes. This article describes the experimental investigation of an air-to-water heat pump, presents the results obtained during the experiments and their interfaces. The experiments were carried out during the transitional/cold season. It was found that frost formation on the evaporator started when the outdoor temperature was <3.5 °C and the relative humidity reached 88%. The defrosting cycle took an average of 5 min. The impact of the evaporator freezing on the operation and COP of the heat pump was assessed.

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“…Electricity is more stable and flexible for steam generation such as the electric boiler, but electricity is secondary energy and thus makes the operation cost of electric boilers higher than fossil fuel-fired boilers. Heat pump is considered to be a more efficient and economical electricity-to-heat conversion device [ 20 ], which can absorb the free heat from ambient air or other sources and thus has a higher efficiency (coefficient of performance or COP) over 100% [ 21 ]. So far, the heat pump systems are widely for hot-water supply (mainly <60 °C) with ambient air as the heat source, and there are even some steam-generation heat pumps [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Air-source heat pump heating based water vapor compression for localized steam sterilization applications during the COVID-19 pandemic

Yan

Wang

2021

Renewable and Sustainable Energy Reviews

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Theoretical and numerical study on performance of the air-source heat pump system in Tibet

Cited by 20 publications

References 19 publications

Experimental Study on the Performance of a Household Dual-Source Heat Pump Water Heater

Experimental Study on the Performance of a Household Dual-Source Heat Pump Water Heater

Experimental Investigation of Frost Formation Influence on an Air Source Heat Pump Evaporator

Air-source heat pump heating based water vapor compression for localized steam sterilization applications during the COVID-19 pandemic

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