Field thermal performance of naturally ventilated solar roof with PCM heat sink

Kośny, Jan; Biswas, Kaushik; Miller, William A.; Kriner, Scott

doi:10.1016/j.solener.2012.05.020

Cited by 128 publications

(76 citation statements)

References 11 publications

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“…The results were found to be in agreement with the previously reported literature findings [26,27]. In [26], a PCMintegrated, building-integrated photovoltaic system reduced roof-generated heating loads by 30% in the winter and cooling load by 55% in the summer. In [27], a wall outfitted with a PCM reduced space-cooling load by 10.4%.…”

Section: Reduction In Heat Gainsupporting

confidence: 91%

“…The heat gain reduction was 44% by the block B and 10.5% by the block C on 24 h basis compared to the block A. The results were found to be in agreement with the previously reported literature findings [26,27]. In [26], a PCMintegrated, building-integrated photovoltaic system reduced roof-generated heating loads by 30% in the winter and cooling load by 55% in the summer.…”

Section: Reduction In Heat Gainsupporting

confidence: 90%

“…Integration of PCM in the building facades yielded an increased heat storage capacity of 2501.3 kJ in 24 h, resulting in an increase in the indoor temperature in the colder climates of Coimbra [25]. Integration of PCM with air cavities in the attic roof employing a building-integrated photovoltaic system reduced the roof-generated heating load by 30% in the winter and cooling load by 55% in the summer [26]. For a wall outfitted with PCM, the space-cooling load was reduced by 10.4%, rendering a 7.2% drop in annual energy consumption [27].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Phase Change Materials (PCMs) Integrated into a Concrete Block on Heat Gain Prevention in a Hot Climate

et al. 2016

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In the current study, a phase change material (PCM) contained in an insulated concrete block is tested in extremely hot weather in the United Arab Emirates (UAE) to evaluate its cooling performance. An insulated chamber is constructed behind the block containing PCM to mimic a scaled down indoor space. The effect of placement of the PCM layer on heat gain indoors is studied at two locations: adjacent to the outer as well as the inner concrete layer. The inclusion of PCM reduced heat gain through concrete blocks compared to blocks without PCM, yielding a drop in cooling load indoors. The placement of PCM and insulation layers adjacent to indoors exhibited better cooling performance compared to that adjacent to the outdoors. In the best case, a temperature drop of 8.5% and a time lag of 2.6 h are achieved in peak indoor temperature, rendering a reduction of 44% in the heat gain. In the tested hot climate, the higher ambient temperature and the lower wind speed hampered heat dissipation and PCM re-solidification by natural ventilation. The findings recommend employing a mechanical ventilation in hot climates to enhance regeneration of the PCM to solid state for its optimal performance.

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Section: Reduction In Heat Gainsupporting

confidence: 91%

Section: Reduction In Heat Gainsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Effect of Phase Change Materials (PCMs) Integrated into a Concrete Block on Heat Gain Prevention in a Hot Climate

et al. 2016

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“…It should be noted, however, that the DSC heating/cooling rate of 1°C per minute is too high for characterizing PCMs for building applications as the temperature changes in real building envelopes occur at a much slower rate. A different heating/cooling rate can appreciably alter the observed melting and freezing temperature thresholds and ranges [3].…”

Section: Temperature and Heat Fluxmentioning

confidence: 99%

Field Testing of Low-Cost Bio-Based Phase Change Material

Biswas¹,

Childs²,

Atchley³

2013

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“…Ventilated roof performances are more remarkable than conventional roof in both summer and winter conditions [12,13]. Ventilated roof performances can be improved using upgrading systems as a function of different effects of summer and winter regimes [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Thermal behavior evaluation of ventilated roof under summer and winter conditions

Bianco¹,

Diana²,

Manca³

et al. 2017

IJHT

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One of the European Directive priorities is the development of new strategies for "very low energy buildings". In regions with high level of solar radiation, ventilation allows the cooling load during summer period and contributes to the reduction of the energy needs of buildings. The most important advantages are the reduction of the heat fluxes transmitted by the structures exposed to solar radiation, thanks to the combined effect of shading surfaces and heat removed by the air flow rate within the ventilated air gap. This paper illustrates a numerical investigation on a prototypal ventilated roof for residential use. The investigation is performed in order to evaluate thermofluidodynamic behaviors of the ventilated roof as a function of the different conditions applied on the top wall and the bottom wall of the ventilated cavity in summer and winter regimes. Different values of heat fluxes are applied on the top wall of the ventilated cavity to simulate typical summer and winter days conditions, whereas the bottom wall is assumed isothermal and different values of wall temperature are considered. The problem is solved by means of the commercial code Ansys-Fluent. Results are given in terms of temperature and velocity distributions, air velocity and temperature profiles along different longitudinal and cross sections of the ventilated layer in order to estimate differences between analyzed conditions.

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Field thermal performance of naturally ventilated solar roof with PCM heat sink

Cited by 128 publications

References 11 publications

Effect of Phase Change Materials (PCMs) Integrated into a Concrete Block on Heat Gain Prevention in a Hot Climate

Effect of Phase Change Materials (PCMs) Integrated into a Concrete Block on Heat Gain Prevention in a Hot Climate

Field Testing of Low-Cost Bio-Based Phase Change Material

Thermal behavior evaluation of ventilated roof under summer and winter conditions

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