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

Zhang, Heng; Chen, Haiping; Liu, Haowen; Huang, Jong Shin; Guo, Xinxin; Li, Mingjie

doi:10.1002/er.4009

Cited by 28 publications

(17 citation statements)

References 28 publications

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“…The unimproved total HTC for the coolant

((), h_{italiccf}^{'})

comes from the Dittus‐Boelter equation which is widely mentioned in most heat transfer book such as:

h_{cf}^{'} = \frac{K}{D_{h}} ((), 0.023 {Re}^{0.8} {Pr}^{0.4})

with

italicPr = \frac{μ C_{p}}{K}

italicRe = \frac{ρ V_{w} D_{h}}{μ}

, and

D_{h} = \frac{4 italicwh}{2 w + 2 h}

, where μ , ρ , C p , and K are the dynamic viscosity, density, specific isobar heat capacity, and thermal conductivity, respectively; V w is the water velocity; w duct width; and duct height h .…”

Section: Mathematical Modelingmentioning

confidence: 99%

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Internal combustion engine waste heat recovery by a thermoelectric generator inserted at combustion chamber walls

Al‐Nimr

Alajlouni

2018

Int J Energy Res

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Summary In this study, a thermoelectric module has been inserted at the wall of the combustion chamber of an internal combustion engine (ICE) to improve its performance by taking the advantage of the high‐temperature difference between ICE combustion gases and coolant fluid. A mathematical analysis under steady‐state conditions has been introduced to investigate the effects of the proposed system. The generated electrical power has been studied versus many parameters such as revolution per minute (RPM), compression ratio of the engine, coolant fluid type, and coolant fluid temperature. The proposed position in this study has many features over the other positions, as the promising innovative position can achieve great results. A typical spark ignition (SI) engine has been used with a suitable thermoelectric generation (TEG) inserted at the wall of the engine's combustion chamber. As a result, 600 W of electrical energy was produced by the proposed system and the efficiency was increased by 2.75% at 4000 RPM which is interestingly better than other TEGs inserted on the exhaust pipe or the radiator of the automobile.

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“…The unimproved total HTC for the coolant

((), h_{italiccf}^{'})

comes from the Dittus‐Boelter equation which is widely mentioned in most heat transfer book such as:

h_{cf}^{'} = \frac{K}{D_{h}} ((), 0.023 {Re}^{0.8} {Pr}^{0.4})

with

italicPr = \frac{μ C_{p}}{K}

italicRe = \frac{ρ V_{w} D_{h}}{μ}

, and

D_{h} = \frac{4 italicwh}{2 w + 2 h}

Section: Mathematical Modelingmentioning

confidence: 99%

“…The unimproved total HTC for the coolant h ′ cf comes from the Dittus-Boelter equation which is widely mentioned in most heat transfer book such as 32 :…”

Section: Mathematical Modelingmentioning

confidence: 99%

Internal combustion engine waste heat recovery by a thermoelectric generator inserted at combustion chamber walls

Al‐Nimr

Alajlouni

2018

Int J Energy Res

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“…Zhai 17 for instance evaluated the performance of a concentrator of solar radiation that employed a linear Fresnel lens. Zhang et al 22 improved the performance of the PV/T system through using a baffle heat exchange channel. The percentages of various kinds of energy losses are estimated.…”

Section: Introductionmentioning

confidence: 99%

An experimental implementation and testing of a concentrated hybrid photovoltaic/thermal system with monocrystalline solar cells using linear Fresnel reflected mirrors

2019

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Summary Integration of solar concentrators with photovoltaic (PV) systems reduces the required number of PV panels, which often account for the major costs of PV systems. The linear Fresnel reflector mirror is considered more effective because of its simplicity and effortless fabrication. An experimental test rig of a concentrated PV/thermal system that employs a linear configuration and horizontal absorber was built for evaluating its electrical and thermal performances. The considered concentrator consists of various widths of flat glass mirrors, which positioned with different angles, and with sun light focusing on the PV cells that fixed over an active cooling system. The experimental investigation of the proposed concentrated PV/thermal system shows that higher electrical and thermal efficiencies can be achieved at comparatively high temperature levels than that typically utilized in a nonconcentrated PV/thermal system. The characteristics of PV cells also indicate that the electrical efficiency values in case of no concentration and with concentration ratio of 6.0 are 9.6%, and 11%, respectively. The measured values for the inlet and outlet cooling water temperatures of the receiver showed that the maximum outlet temperature reached was 75°C with a flow rate of 0.025 L/min, and the product thermal efficiency was 62.3%. These obtained results illustrate an adequate and good thermal and electrical performance under the meteorological weather conditions of the province of Al‐Karak in Jordan.

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“…MPCS was used as the cooling fluid by Qiu et al in a PV/T system and an experiment was proposed to validate the theoretical investigation. Zhang et al conducted an investigation on a low concentration PV/T module. The results indicated that the maximum thermal and electrical efficiencies of the module were 55.11% and 12.50%.…”

Section: Introductionmentioning

confidence: 99%

Performance optimization of a photovoltaic/thermal collector using microencapsulated phase change slurry

2019

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Summary In a photovoltaic/thermal (PV/T) collector, a portion of absorbed solar energy is transformed into electrical energy, and the remaining part is transformed into thermal energy. Increasing waste heat collection and energy conversion rates are important to improve the performance of the PV/T collector. The utilization of microencapsulated phase change slurry (MPCS) in a PV/T collector to cool photovoltaic modules is an effective way, and electrical and thermal performances of the collector are improved. To investigate influences of operating parameters on performances of PV/T collector, numerical simulation is put into effect to analyze influences of the mass fraction of MPCS on the collector performance. The influences of MPCS mass flow rate and collector channel height on collector performances are also studied. When the flow rate is 0.005 kg/s and the channel height is 0.010 m, the PV/T collector obtains the best net efficiency with a MPCS mass concentration of 20 wt%. But electrical efficiency difference between 15 and 20 wt% is not obvious. With the growth in mass fraction, PV temperature drops more and more slowly because outlet fluid has not fully melt. Take PV/T collector performances into consideration, 15 wt% MPCS is a better choice to cool photovoltaic modules.

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

Cited by 28 publications

References 28 publications

Internal combustion engine waste heat recovery by a thermoelectric generator inserted at combustion chamber walls

Internal combustion engine waste heat recovery by a thermoelectric generator inserted at combustion chamber walls

An experimental implementation and testing of a concentrated hybrid photovoltaic/thermal system with monocrystalline solar cells using linear Fresnel reflected mirrors

Performance optimization of a photovoltaic/thermal collector using microencapsulated phase change slurry

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