Thermal performance analysis of a direct-expansion solar-assisted heat pump water heater

Kong, Xiangqiang; Zhang, D.; Li, Y.; Yang, Qiusheng

doi:10.1016/j.energy.2011.10.013

Cited by 33 publications

(35 citation statements)

References 19 publications

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“…The model was validated using experimental data. The measured COP was between 1.7 and 2.9 for the load temperature of 51 ○ C. Kong et al [8] studied a direct expansion SAHP system for DHW heating and used a simulation approach to predict the system performance. The model was validated using experimental measurements.…”

Section: Acshmentioning

confidence: 99%

Techno-economic assessment of solar assisted heat pump system retrofit in the Canadian housing stock

2017

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The techno-economic feasibility of retrofitting existing Canadian houses with solar assisted heat pump (SAHP) is investigated. The SAHP architecture is adopted from previous studies conducted for the Canadian climate. The system utilizes two thermal storage tanks to store excess solar energy 10 for use later in the day. The control strategy is defined in order to prioritise the use of solar energy 11 for space and domestic hot water heating purposes. Due to economic and technical constraints a 12 series of eligibility criteria are introduced for a house to qualify for the retrofit. A model was built 13 in ESP-r and the retrofit was introduced into all eligible houses in the Canadian Hybrid Residential 14 End-Use Energy and GHG Emissions model. Simulations were conducted for an entire year to 15 estimate the annual energy savings, and GHG emission reductions. Results show that the SAHP system performance is strongly affected by climatic conditions, auxiliary energy sources and fuel mixture for electricity generation. Energy consumption and GHG emission of the Canadian housing stock can be reduced by about 20% if all eligible houses receive the SAHP system retrofit. Economic analysis indicates that the incentive measures will likely be necessary to promote the SAHP system in the Canadian residential market.

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Section: Acshmentioning

confidence: 99%

Techno-economic assessment of solar assisted heat pump system retrofit in the Canadian housing stock

2017

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“…Although Canren Lv of Tianjin University, the pioneer of heat pump study in China, had suggested the need for application of heat pumps in 1955 [4], only in the recent two decades, studies have been conducted on heat pumps for residential usage for energy saving. To date, heat pump techniques for residential usage have been well developed to meet the heating requirements of a section of the residents in China [5,6]. However, heat pumps have not been widely applied for industrial usage for recovering lowgrade waste heat in China [7].…”

Section: Introductionmentioning

confidence: 99%

A comprehensive review on advances and applications of industrial heat pumps based on the practices in China

Zhang

et al. 2016

Applied Energy

182

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“…They also suggested that variable frequency compressor and electronic expansion valve should be applied in the system. A DX-SAHP water heater was numerically simulated by Kong et al [15]. It is concluded that wind speed has no great effect on the system performance.…”

Section: Introductionmentioning

confidence: 99%

“…15.0 ∘ C RH = 50% I = 300 W/m 2 T a = 10.0 ∘ C RH = 50% I = 300 W/m 2 T a = 5.0 ∘ C RH = 50% I = 300 W/m 2 100 Variation of COP with the ambient temperature of 5°C, 10°C, and 15°C.T a =C15.0 ∘ C RH = 50% I = 500 W/m 2 T a = 15.0 ∘ C RH = 50% I = 300 W/m 2 T a = 15.0 ∘ C RH = 50% I = 200 W/m 2 T a = 15.0 ∘ C RH = 50% I = 100 W/m 2 T a = 15.0 ∘ C RH = 50% I = 0 Variation of the energy consumption with solar irradiance of 0 W m −2 , 100 W m −2 , 200 W m −2 , 300 W m −2 , and 500 W m −2 . cond (T a = 15.0 ∘ C RH = 50% I = 500 W/m 2 ) Q cond (T a = 15.0 ∘ C RH = 50% I = 200 W/m 2 ) Q cond (T a = 15.0 ∘ C RH = 50% I = 300 W/m 2 ) Q cond (T a = 15.0 ∘ C RH = 50% I = 0 W/m 2 ) Q cond (T a = 15.0 ∘ C RH = 50% I = 100 W/m 2 ) Q cond (T a = 15.0 ∘ C RH = 50% I = 300 W/m 2 ) Q cond (T a = 15.0 ∘ C RH = 50% I = 100 W/m 2 ) Q evap (T a = 5.0 ∘ C RH = 50% I = 200 W/m 2 ) Q evap (T a = 15.0 ∘ C RH = 50% I = 500 W/m 2 ) Q evap (T a = 15.0 ∘ C RH = 50% I = 0 W/m 2 ) Variation of the evaporating and condensing heat exchange rate with solar irradiance of 0 W m −2 , 100 W m −2 , 200 W m −2 , 300 W m −2 , and 500 W m −2 .…”

mentioning

confidence: 99%

Effects of Ambient Parameters on the Performance of a Direct-Expansion Solar-Assisted Heat Pump with Bare Plate Evaporators for Space Heating

Huang¹,

Ji²,

Modjinou³

et al. 2017

International Journal of Photoenergy

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Research on the direct-expansion solar-assisted heat pump (DX-SAHP) system with bare plate evaporators for space heating is meaningful but insufficient. In this paper, experiments on a DX-SAHP system applying bare plate evaporators for space heating are conducted in the enthalpy difference lab with a solar simulator, with the ambient conditions stable. The independent effects of ambient temperature, solar irradiation, and relative humidity on the system performance are investigated. When ambient temperature changes as 5°C, 10°C, and 15°C, COP increases as 2.12, 2.18, and 2.26. When solar irradiance changes as 0 W m−2, 100 W m−2, 200 W m−2, 300 W m−2, and 500 W m−2, COP of the system changes as 2.07, 2.09, 2.14, 2.26, and 2.36. With ambient temperature of 5°C and solar irradiance of 0 W m−2, when relative humidity is 50%, no frost formed. Whereas with relative humidity of 70% and 90%, frost formed but not seriously frosted after 120 min of operating. Frost did not deteriorate but improved the heating performance of the DX-SAHP system. The change of relative humidity from 70% to 90% improves the evaporating heat exchange rate by 35.0% and increases COP by 16.3%, from 1.78 to 2.07.

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Thermal performance analysis of a direct-expansion solar-assisted heat pump water heater

Cited by 33 publications

References 19 publications

Techno-economic assessment of solar assisted heat pump system retrofit in the Canadian housing stock

Techno-economic assessment of solar assisted heat pump system retrofit in the Canadian housing stock

A comprehensive review on advances and applications of industrial heat pumps based on the practices in China

Effects of Ambient Parameters on the Performance of a Direct-Expansion Solar-Assisted Heat Pump with Bare Plate Evaporators for Space Heating

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