Experimental study on the operating characteristics of a novel low-concentrating solar photovoltaic/thermal integrated heat pump water heating system

Xu, Guoying; Zhang, Xiaosong; Deng, Shiming

doi:10.1016/j.applthermaleng.2011.01.030

Cited by 101 publications

(27 citation statements)

References 12 publications

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“…Therefore, the deviation of the performance calculated by the model discussed in the previous section and the interpolating curve is basically due to the fact that, in the proposed model, the overall heat transfer coefficients are not constant and vary with the CPVT operating conditions. Conversely, there is not a good correlation between the electrical efficiency and the parameter shown in Equation (25). In fact, the electrical efficiency of the CPVT basically depends on the operating temperature of the PV layer and on the concentration ratio, as shown in Equation (11).…”

Section: Resultsmentioning

confidence: 97%

“…On the basis of the CPVT model discussed in the previous section, electrical and thermal efficiencies were analyzed as a function of the parameter shown below [34]: (25) The result of this analysis is shown in Figure 2. Here, it is clearly shown that the correlation between the thermal efficiency and the above mentioned parameter is very good.…”

Section: Resultsmentioning

confidence: 99%

“…Additional specific applications of CPVT technology are also investigated in literature. Xu et al [25] analyzed the integration of CPVT in the evaporator of a heat pump system. Al-Alilli et al [26] investigated the use of a CPVT in a desiccant cooling system.…”

Section: Introductionmentioning

confidence: 99%

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Parabolic Trough Photovoltaic/Thermal Collectors: Design and Simulation Model

Calise

Vanoli

2012

Energies

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This paper presents a design procedure and a simulation model of a novel concentrating PVT collector. The layout of the PVT system under investigation was derived from a prototype recently presented in literature and commercially available. The prototype consisted in a parabolic trough concentrator and a linear triangular receiver. In that prototype, the bottom surfaces of the receiver are equipped with mono-crystalline silicon cells whereas the top surface is covered by an absorbing surface. The aperture area of the parabola was covered by a glass in order to improve the thermal efficiency of the system. In the modified version of the collector considered in this paper, two changes are implemented: the cover glass was eliminated and the mono-crystalline silicon cells were replaced by triple-junction cells. In order to analyze PVT performance, a detailed mathematical model was implemented. This model is based on zero-dimensional energy balances. The simulation model calculates the temperatures of the main components of the system and the main energy flows Results showed that the performance of the system is excellent even when the fluid temperature is very high (>100 °C). Conversely, both electrical and thermal efficiencies dramatically decrease when the incident beam radiation decreases.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Parabolic Trough Photovoltaic/Thermal Collectors: Design and Simulation Model

Calise

Vanoli

2012

Energies

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“…Xu et al [26] developed a low-concentrating PVT integrated heat pump system with both electricity and heat outputs. Fixed truncated parabolic concentrators with geometrical concentration ratio of 2.44 x were adopted [26]. Moreover, a roof-integrated concentration solar system for a self-sustainable Mediterranean villa, the Astonyshine house, was investigated [27].…”

Section: Introductionmentioning

confidence: 99%

“…The optical unit was based on a stationary wide angle optical concentrator which transmitted the input radiation into a small moving focal area, which in turn was tracked by the solar absorber [25]. Xu et al [26] developed a low-concentrating PVT integrated heat pump system with both electricity and heat outputs. Fixed truncated parabolic concentrators with geometrical concentration ratio of 2.44 x were adopted [26].…”

Section: Introductionmentioning

confidence: 99%

Experimental performance of a Fresnel-transmission PVT concentrator for building-façade integration

et al. 2016

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a b s t r a c tA building-façade integrated concentrating photovoltaic-thermal system has been designed, constructed and experimentally characterised. Comparative performances with a non-concentration reference unit have been conducted to analyse the differential outputs. The concentrating system consists of doubleside reflective strips which concentrate the incident beam towards a static photovoltaic-thermal receiver. The reflectors are placed vertically at the façade and track the sun by rotating axially. The concentrating reflector outperforms the reference one in both, thermal and electrical power. The thermal output of the concentration module almost doubles the reference one and the electrical power registered is more than 4.5 times in the case of the concentrating configuration.

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Design and performance study of a low concentration photovoltaic-thermal module

et al. 2018

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Summary Compared with traditional photovoltaic‐thermal system, low concentration photovoltaic‐thermal systems install the low‐power concentrator (compound parabolic concentrator, Fresnel concentrator, miniature trough concentrator, etc) to improve system performance. In this paper, a baffle heat exchange channel was designed, which can decrease the temperature gradient of low concentration photovoltaic‐thermal module in the flow direction, based on the traditional flat‐box photovoltaic‐thermal collector. The system performance was monitored with different baffle spacing, flow rate, inlet temperature, ambient temperature, and radiation intensity by adopting simulation methodology. Furthermore, an experiment was performed to validate and evaluate the simulation results. The results indicated that, on a typical day, the maximum of thermal efficiency and electrical efficiency of the module were 55.11% and 12.50%, respectively.

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Experimental study on the operating characteristics of a novel low-concentrating solar photovoltaic/thermal integrated heat pump water heating system

Cited by 101 publications

References 12 publications

Parabolic Trough Photovoltaic/Thermal Collectors: Design and Simulation Model

Parabolic Trough Photovoltaic/Thermal Collectors: Design and Simulation Model

Experimental performance of a Fresnel-transmission PVT concentrator for building-façade integration

Design and performance study of a low concentration photovoltaic-thermal module

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