Abstract
Thermal comfort is an important aspect to take into consideration for the indoor environment of a building integrated with a semi-transparent Photovoltaics (STPV) system. The thermal comfort of units with photovoltaic windows and that of conventional windows, which is an ordinary without PV, were evaluated via on-site tests and questionnaires. Using the thermal comfort investigation of the test rig, the maximum difference in air temperature was found to be around 5 °C between test unit and comparison unit. The predicted mean vote (PMV)–predicted percentage dissatisfied (PPD) value of the test unit was better than that of the comparison unit. It was observed that on sunny days, the PMV value ranged from 0.2 (nature) to 1.3 (slightly warm) in the test unit, and that of the comparison unit was 0.7 (slightly warm) to 2.0 (warm), thereby providing better thermal comfort, especially during mornings. The maximum difference in PPD values was found to reach 27% between the two units at noon. On cloudy days, the difference was negligible, and the thermal sensation between the foot and the head were almost the same. Fifty respondents were asked to complete a carefully designed questionnaire. The thermal sensation of the test unit was better than that of comparison unit, which corresponded with the test results. Thermal, lighting, acoustic, and other environment comfort scores were combined, and the acceptance of the test unit with the STPV windows was found to be 73.8%. The thermal sensation difference between men and women was around 5%. Thus, during summer, STPV windows can improve the thermal comfort and potentially reduce the air-conditioning load.
Highlights
Since accelerated economic development goes hand in hand with exorbitant energy consumption, the demand of energy is continually on the rise
The thermal comfort index predicted mean vote (PMV)-predicted percentage dissatisfied (PPD) reflects the degree of human thermal balance deviation and is a comprehensive comfort indicator that represents the feelings of most people in the same environment
The temperature of the inner surface of the single-layer window was around 4 ◦ C higher than that of double-layer window. It would bring a negative impact on the indoor thermal comfort and temperature fluctuations in the summer
Summary
Since accelerated economic development goes hand in hand with exorbitant energy consumption, the demand of energy is continually on the rise. STPV windows windows should should include include performance assessment, energy consumption prediction, and thermal comfort evaluation. MingzheLiu reduction in temperature difference between floor and ceiling was achievable with electrochromic et al [12] conducted parametric on parametric the heat transfer, daylight, and transfer, thermal comfort a windows. The results showed significant improvement in overall thermal comfort, and air-conditioning energy savings of AbouHweij et al [13]. The results showed significant improvement in overall thermal comfort, and air-conditioning energy savings of up to 10% were up to 10% were recorded. The CPMV was validated to be applicable for evaluating the indoor thermal comfort of buildings solar radiation. For the assessment of indoor thermal comfort, a test or a questionnaire were with solar selected as the evaluation methods.
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