Operational performance of a novel heat pump assisted solar façade loop-heat-pipe water heating system

He, Wei; Hong, Xiaoqiang; Zhao, Xudong; Zhang, Xingxing; Shen, Jinchun; Ji, Jie

doi:10.1016/j.apenergy.2015.01.096

Cited by 60 publications

(16 citation statements)

References 35 publications

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“…It was calculated that the forward voltage of the solar cell decreases ~2 mV/K, with temperature increase. The results are in agreement with the earlier data for silicon solar cells [24][25][26][27][28][29]. Figure 11c shows a thermogram of the surface temperature after measurements when the solar thermal system was turned on (left) and off (right).…”

Section: Discussionsupporting

confidence: 91%

Tests and theoretical analysis of a pvt hybrid collector operating under various insolation conditions

et al. 2018

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The main goal of the study was to investigate the relationship between the orientation of the PVT (PhotoVoltaic Thermal) collector and the thermal and electric power generated. Extensive research was performed to find optimal tilt angles for hybrid solar thermal collectors, which combine photovoltaic as well as thermal collection in a single unit, known as PVT (PhotoVoltaic Thermal) modules for an office building with working hours between 7.00 and 16.00. The comprehensive study included field measurements of the modules in central Poland and tests under AM (air mass) 1.5 conditions in a certified laboratory KEZO (Centre for Energy Conversion and Renewable Resources) Polish Academy of Sciences in Jablonna. Furthermore, a PVT system was investigated using the simulation method based on the dedicated Polysun software. The PV characteristics and efficiency of the PV module and the relation between power or efficiency of the PVT module and incidence angle of solar-irradiance were studied. Optimal work conditions for commercial PVT modules were ascertained. In addition, it was found that the maximum efficiencies of PV module (ηPV), solar thermal-collector (ηc) and PVT hybrid collector (ηPVT) registered under field conditions were higher than the ones measured under laboratory conditions.

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Section: Discussionsupporting

confidence: 91%

Tests and theoretical analysis of a pvt hybrid collector operating under various insolation conditions

et al. 2018

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“…As can be observed in Figure 9, Tew decreases corresponding to an increase in φ. This is because if the value of kweff concerning the capillary structure decreases, values of Fg-w and Fw-wi also subsequently decrease, thereby causing the thermal energy transferred to the condenser to increase, as described in Equations (6) and (8) and Table 1. For example, at Qin = 80 W, as the value of φ increases from 0.6 to 0.75, that of Tew is reduced by approximately 27 °C.…”

Section: Resultsmentioning

confidence: 99%

“…They have been used for cooling of high-power electrical and electronic components and solar photovoltaic cooling to enhance the efficiency of renewable energy generation. In addition, quite a few investigations were conducted pertaining to the use of LHPs as heat-transfer devices in solar-photovoltaic systems and water-heating systems [1][2][3][4][5][6], solar-power towers [7,8] and in HVAC systems [9][10][11] to enhance the heat transfer performance. Specific information and discussions regarding the use of LHPs can be found in [12,13].…”

Section: Introductionmentioning

confidence: 99%

A Novel Analytical Modeling of a Loop Heat Pipe Employing the Thin-Film Theory: Part I—Modeling and Simulation

Jung

Boo

2019

Energies

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In this study, steady-state analytical modeling of a loop heat pipe (LHP) equipped with a flat evaporator is presented to predict the temperatures and pressures at each important part of the LHP—evaporator, liquid reservoir (compensation chamber), vapor-transport tube, liquid-transport tube, and condenser. Additionally, this study primarily focuses on analysis of the evaporator—the only LHP component comprising a capillary structure. The liquid thin-film theory is considered to determine pressure and temperature values concerning the region adjacent to the liquid-vapor interface within the evaporator. The condensation-interface temperature is subsequently evaluated using the modified kinetic theory of gases. The present study introduces a novel method to estimate the liquid temperature at the condensation interface. Existence of relative freedom is assumed with regard to the condenser configuration, which is characterized by a simplified liquid–vapor interface. The results obtained in this study demonstrate the effectiveness of the proposed steady-state analytical model with regard to the effect of design variables on LHP heat-transfer performance. To this end, the condenser length, porosity of its capillary structure, and drop in vapor temperature therein are considered as design variables. Overall, the LHP thermal performance is observed to be reasonably responsive to changes in design parameters.

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“…Solar energy, as one of the most important sustainable energies, is infinite, clean and pollution-free, which is considered as the renewable and carbon-neutral energy source of sufficient scale to replace fossil fuels [1,2]. The utilization of solar energy can be categorized into two types, i.e., photovoltaic (PV) and solar thermal.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the thermal and electrical performance of the heat pipe BIPV/T system with metal wires

et al. 2016

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Operational performance of a novel heat pump assisted solar façade loop-heat-pipe water heating system

Cited by 60 publications

References 35 publications

Tests and theoretical analysis of a pvt hybrid collector operating under various insolation conditions

Tests and theoretical analysis of a pvt hybrid collector operating under various insolation conditions

A Novel Analytical Modeling of a Loop Heat Pipe Employing the Thin-Film Theory: Part I—Modeling and Simulation

Experimental investigation of the thermal and electrical performance of the heat pipe BIPV/T system with metal wires

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