Performance of different photovoltaic-thermal (PVT) configurations integrated on prototype test cells: An experimental approach

Tomar, V S; Tiwari, G.N.; Bhatti, T. S.

doi:10.1016/j.enconman.2017.11.033

“…less than 100 W/m 2 ). This large range in solar flux values causes erroneously large variations of the thermal efficiency of the panel, and in the event that the solar flux is zero, Equation (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) does not have a real solution. Therefore, to accommodate for this large range in solar flux values a maximum and minimum allowable thermal efficiency were imposed on the system such that when a solution to Equation (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) results in a value outside of these limits the solution can be set to either the upper or lower limit.…”

Section: Heat Input System Analysis Processmentioning

confidence: 99%

Development of a hybrid solar cascade heat pump heating system

Fine¹

2021

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Society’s use of fossil fuels has led to increasingly high levels of CO2 in the atmosphere. These levels have been linked to global average temperature rises, and increases in the severity and frequency of major weather events. To combat these effects, nations around the world have committed to reducing their CO2 emissions, and transition to renewable energy. This thesis focuses on the development of a novel solar heating system, which combines a hybrid solar panel and cascade heat pump. The thesis begins by presenting a high-level literature review of solar and heat pump technologies, followed by the initial design development of the system. Two design iterations are presented, illustrating that the final design was selected because it exhibits improved peak heat output, and reduced sensitivity to panel temperature. Next, a manuscript-based chapter is presented that focuses on utilizing the proposed solar heating system for water distillation. Case studies are presented that compare the performance of the proposed system with a solar still at four different locations. The final conclusion from these studies is that using the proposed system offers area-based performance improvements of 780% compared to a basic solar still. A second manuscript-based study is then presented, which focuses on utilizing the proposed solar heating system for domestic hot water production. Additional case studies are detailed that compare the proposed system to an evacuated tube design, and a single heat pump. The conclusions from these studies are that the proposed system exceeds the performance of the evacuated tube system by up to 64%, and that the proposed system is most beneficial during seasons with higher average dry-bulb temperatures, and increased solar irradiation. A final manuscript-based study is then presented, which focuses on a methodology for improving alternate mode thermal performance estimates for hybrid solar panels. The conclusion from this study is that the proposed methodology can successfully estimate thermal performance within 5% of actual values. Each of these studies contributes to the project goal of developing a novel solar energy heating system, which can be further developed to reduce global CO2 emissions, and reduce the effects of climate change.

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“…The saturation temperature of the condenser in loop RB can then be found using Equation (3)(4)(5)(6)(7)(8)(9)(10)(11)(12).…”

Section: Heat Input System Analysis Processmentioning

confidence: 99%

“…6<B9 _`b = 9'87= cdefa + ∆ XY^ (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) where 6<B9 _`b is the saturation temperature of the condenser in loop RB, 9'87= cdefa is the saturation temperature of the first tank in the desalination process, and ∆ XY^ is the temperature difference between the saturation temperature of the condenser in loop RB and the saturation temperature of the first tank in the desalination process.…”

Section: Heat Input System Analysis Processmentioning

confidence: 99%

“…6<B9 _`a = 'g7I _`h + ∆ XY1 (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13) where 6<B9 _`a is the saturation temperature of the condenser in loop RA, and ∆ XY1 is the temperature difference between the condenser in loop RA and the evaporators in loop RB.…”

Section: Heat Input System Analysis Processmentioning

confidence: 99%

“…Next, the temperature of the cooling fluid entering the solar panel for the current time-step is set to the temperature of the thermal storage tank from the previous time-step. This relationship is shown in Equation (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15).…”

Section: Heat Input System Analysis Processmentioning

confidence: 99%

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Development of a hybrid solar cascade heat pump heating system

Fine¹

2021

Preprint

0

View full text Add to dashboard Cite

Society’s use of fossil fuels has led to increasingly high levels of CO2 in the atmosphere. These levels have been linked to global average temperature rises, and increases in the severity and frequency of major weather events. To combat these effects, nations around the world have committed to reducing their CO2 emissions, and transition to renewable energy. This thesis focuses on the development of a novel solar heating system, which combines a hybrid solar panel and cascade heat pump. The thesis begins by presenting a high-level literature review of solar and heat pump technologies, followed by the initial design development of the system. Two design iterations are presented, illustrating that the final design was selected because it exhibits improved peak heat output, and reduced sensitivity to panel temperature. Next, a manuscript-based chapter is presented that focuses on utilizing the proposed solar heating system for water distillation. Case studies are presented that compare the performance of the proposed system with a solar still at four different locations. The final conclusion from these studies is that using the proposed system offers area-based performance improvements of 780% compared to a basic solar still. A second manuscript-based study is then presented, which focuses on utilizing the proposed solar heating system for domestic hot water production. Additional case studies are detailed that compare the proposed system to an evacuated tube design, and a single heat pump. The conclusions from these studies are that the proposed system exceeds the performance of the evacuated tube system by up to 64%, and that the proposed system is most beneficial during seasons with higher average dry-bulb temperatures, and increased solar irradiation. A final manuscript-based study is then presented, which focuses on a methodology for improving alternate mode thermal performance estimates for hybrid solar panels. The conclusion from this study is that the proposed methodology can successfully estimate thermal performance within 5% of actual values. Each of these studies contributes to the project goal of developing a novel solar energy heating system, which can be further developed to reduce global CO2 emissions, and reduce the effects of climate change.

show abstract