Photovoltaic–thermal collectors for night radiative cooling of buildings

Eicker, Ursula; Dalibard, Antoine

doi:10.1016/j.solener.2011.03.015

Cited by 201 publications

(72 citation statements)

References 22 publications

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“…Solar panels release heat in the form of longwave radiation towards the night sky (-40 o C/-40 o F). The benefits of nighttime radiative cooling are the low energy usage (since only a water circulation pump is required); the higher utilization factor of the solar panels (since they are exploited also during nighttime); that cold water production and cooling demand are in phase, since clear skies occur more often during the summer period, and that they can be coupled with thermal storage systems such as TABS and PCM (Meir et al 2002;Eicker & Dalibard 2011;Hosseinzadeh & Taherian 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The use of photovoltaic/thermal panels (PV/T) panels for nighttime radiative cooling together with PCM for space cooling has been reported by (Eicker & Dalibard 2011;Lin et al 2014;Fiorentini et al 2015) and in the first of these the PCM was part of the radiant cooling system. The purpose of the present experiment was to demonstrate that the coupling of PV/T panels with a radiant ceiling cooling system containing PCM can contribute to the realization of nZEB.…”

Section: Introductionmentioning

confidence: 99%

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Daytime space cooling with phase change material ceiling panels discharged using rooftop photovoltaic/thermal panels and night-time ventilation

Bourdakis

Péan

Gennari

et al. 2016

Science and Technology for the Built Environment

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Daytime space cooling with phase change material ceiling panels discharged using rooftop photovoltaic/thermal panels and night-time ventilation

Bourdakis

Péan

Gennari

et al. 2016

Science and Technology for the Built Environment

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“…The convective heat transfer coefficient on the upper/outside surface of the PVT is dependent on the local wind speed (Vw) and is calculated from the correlation (3.19) by considering both the natural and forced convection components through the following relationship [12], in which the forced convection heat transfer coefficient is determined by Equation (3.20) [17]. where, is the aspect ratio (height/width) of the channel, Pr is the Prandtl number of air and is equal to 0.4 when the airflow is heated and 0.3 when the airflow is cooled.…”

Section: Thermal Modelmentioning

confidence: 99%

“…PCMs have been studied over the past years in both passive and active systems [2,3] and a number of research groups have investigated PVT systems coupled with ventilated slabs for energy storage [9,10]. Studies on the effectiveness of PVT collectors during daytime heating and night-time radiative cooling have been undertaken, for both water-based and air-based systems [10][11][12]. This paper focusses on the development and modelling of an innovative solar PVTassisted Heating, Ventilation and Air Conditioning (HVAC) system integrated with a PCM thermal energy storage unit.…”

Section: Introductionmentioning

confidence: 99%

Development and optimization of an innovative HVAC system with integrated PVT and PCM thermal storage for a net-zero energy retrofitted house

Fiorentini

Cooper

2015

Energy and Buildings

144

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. (2015). Development and optimization of an innovative HVAC system with integrated PVT and PCM thermal storage for a net-zero energy retrofitted house. Energy and Buildings, Development and optimization of an innovative HVAC system with integrated PVT and PCM thermal storage for a net-zero energy retrofitted house AbstractThis paper describes a novel solar-assisted HVAC system developed for the Team UOW 'Illawarra Flame' Solar Decathlon house, the winner of the Solar Decathlon China 2013 competition. This HVAC system consists of an air-based photovoltaic-thermal (PVT) collector and a phase change material (PCM) thermal storage unit integrated with a reverse cycle heat pump, in a ducted system. The system was designed for operation during both winter and summer using daytime solar radiation and night-time sky radiative cooling, respectively. The PVT collector heats or cools fresh air from ambient and thereby provides heating or cooling either directly to the indoor space, or to the PCM storage unit. The heat stored in the PCM can be used later to condition the space or precondition the air entering the air handling unit. Analytical models for the PVT collector and PCM unit were developed in order to be easily implemented into a practical building management system (BMS). Experimental studies on the PVT collector and PCM unit were carried out and the data was used to validate the effectiveness of the models. It is shown that there is a good agreement between the model simulation results and experimental test data. A simple optimisation methodology of the operating modes that involve these components is also presented. collector and a Phase Change Material (PCM) thermal storage unit integrated with a reverse cycle heat pump, in a ducted system. The system was designed for operation during both winter and summer using daytime solar radiation and night-time sky radiative cooling, respectively. The PVT collector heats or cools fresh air from ambient and thereby provides heating or cooling either directly to the indoor space, or to the PCM storage unit. The heat stored in the PCM can be used later to condition the space or precondition the air entering the Air Handling Unit. Analytical models for the PVT collector and PCM unit were developed in order to be easily implemented into a practical Building Management System (BMS).Experimental studies on the PVT collector and PCM unit were carried out and the data was used to validate the effectiveness of the models. It is shown that there is a good agreement between the model simulation results and experimental test data. A simple optimisation methodology of the operating modes that involve these components is also presented.

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“…Therefore technologies used for heat rejection include night radiative cooling [2], sea-, lake-or groundwater cooling, including buried irrigation tanks [3] or swimming pools [4]. Yet the most commonly used heat sink is ambient air, as the above named options are rarely available or costly to exploit.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Air-Based Heat Rejection Systems

et al. 2015

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On the basis of the Number of Transfer Units (NTU) method a functional relation between electric power for fans/pumps and effectiveness in dry coolers and wet cooling towers is developed. Based on this relation, a graphical presentation method of monitoring and simulation data of heat rejection units is introduced. The functional relation allows evaluating the thermodynamic performance of differently sized heat rejection units and comparing performance among them. The method is used to evaluate monitoring data of dry coolers of different solar cooling field projects. The novelty of this approach is that performance rating is not limited by a design point or standardized operating conditions of the heat exchanger, but is realizable under flexible conditions.

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Photovoltaic–thermal collectors for night radiative cooling of buildings

Cited by 201 publications

References 22 publications

Daytime space cooling with phase change material ceiling panels discharged using rooftop photovoltaic/thermal panels and night-time ventilation

Daytime space cooling with phase change material ceiling panels discharged using rooftop photovoltaic/thermal panels and night-time ventilation

Development and optimization of an innovative HVAC system with integrated PVT and PCM thermal storage for a net-zero energy retrofitted house

Performance Evaluation of Air-Based Heat Rejection Systems

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