{"title":"Energy and Exergy Analyses of Plastic Solar Air Heater Developed from Chlorinated Polyvinyl Chloride Pipes","authors":"Seelam Venkata Kota Reddy, Kavati Venkateswarlu, Faisal Akram, Anuj Prasanth, Aswyn Patrick, Nabeel Ahmed, Swapnesh Panicker, Tooba Shariff","doi":"10.3103/s0003701x2360087x","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The solar air heaters fabricated from plastics could reduce both material and fabrication costs. However, those fabricated from conventional plastics such as PVC suffer from the fundamental drawback that they cannot withstand higher temperatures. This work aims at fabricating a plastic solar air heater (PSAH) using chlorinated poly vinyl chloride (CPVC) and experimentally investigating its performance with cover made of 0.5 mm thick polyethylene and that without cover. To examine the effectiveness of PSAH at a tilt angle of 30°, all investigations were carried out at the University campus of Manipal, Dubai (25°08′00.1″ 55°25′31.0″ E) at an average global solar irradiation of 290 W/m<sup>2</sup>and average ambient temperature of 33–37.7°C from April16 to May 20, independently, for the two situations: with and without covers. The temperature rise of the air was recorded in both the inlet and outflow at different intervals by adjusting the MFRs of the air in steps of 0.025 kg/s, ranging from 0.02 to 0.055 kg/s. Energy efficiency (η<sub>energy</sub>), exergy efficiency (η<sub>exergy</sub>) of the collector, coefficient of hydraulic resistance, pressure drop, heat loss factor and thermal and optical heat losses were evaluated at various mass flow rates (MFR) of air as well as with the time of the day. It was found that the highest collector’s η<sub>energy</sub> is found as 30 and 70.6% respectively for PSAH without cover and with cover with a constant inflow of air at 0.05 kg/s while the highest η<sub>exergy</sub> is observed to be 17.8 and 26.1% respectively at an MFR of 0.03 kg/s. Collector’s η<sub>energy</sub> increases with an increase in MFR of air while η<sub>exergy</sub> shows the reverse trend. The highest rise in temperature of air was found to be 14.5 and 44<sup>o</sup>C for PSAH without and with covers respectively. The coefficient of hydraulic resistance and pressure drop were observed to be insignificant. The overall heat loss coefficient for convection is calculated for PSAH without and with top covers respectively to be 3.7 and 2.4 W/m<sup>2</sup> K. The maximum rates of thermal and optical losses were also calculated for PSAH without and with top covers to be 140, 75 W and 102 and 42 W respectively. Thus, the useful energy without and with top covers is 38 and 59% respectively of the total energy supplied by the PSAH (345 W).</p>","PeriodicalId":475,"journal":{"name":"Applied Solar Energy","volume":null,"pages":null},"PeriodicalIF":1.2040,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Solar Energy","FirstCategoryId":"1","ListUrlMain":"https://doi.org/10.3103/s0003701x2360087x","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Energy","Score":null,"Total":0}
引用次数: 0
Abstract
The solar air heaters fabricated from plastics could reduce both material and fabrication costs. However, those fabricated from conventional plastics such as PVC suffer from the fundamental drawback that they cannot withstand higher temperatures. This work aims at fabricating a plastic solar air heater (PSAH) using chlorinated poly vinyl chloride (CPVC) and experimentally investigating its performance with cover made of 0.5 mm thick polyethylene and that without cover. To examine the effectiveness of PSAH at a tilt angle of 30°, all investigations were carried out at the University campus of Manipal, Dubai (25°08′00.1″ 55°25′31.0″ E) at an average global solar irradiation of 290 W/m2and average ambient temperature of 33–37.7°C from April16 to May 20, independently, for the two situations: with and without covers. The temperature rise of the air was recorded in both the inlet and outflow at different intervals by adjusting the MFRs of the air in steps of 0.025 kg/s, ranging from 0.02 to 0.055 kg/s. Energy efficiency (ηenergy), exergy efficiency (ηexergy) of the collector, coefficient of hydraulic resistance, pressure drop, heat loss factor and thermal and optical heat losses were evaluated at various mass flow rates (MFR) of air as well as with the time of the day. It was found that the highest collector’s ηenergy is found as 30 and 70.6% respectively for PSAH without cover and with cover with a constant inflow of air at 0.05 kg/s while the highest ηexergy is observed to be 17.8 and 26.1% respectively at an MFR of 0.03 kg/s. Collector’s ηenergy increases with an increase in MFR of air while ηexergy shows the reverse trend. The highest rise in temperature of air was found to be 14.5 and 44oC for PSAH without and with covers respectively. The coefficient of hydraulic resistance and pressure drop were observed to be insignificant. The overall heat loss coefficient for convection is calculated for PSAH without and with top covers respectively to be 3.7 and 2.4 W/m2 K. The maximum rates of thermal and optical losses were also calculated for PSAH without and with top covers to be 140, 75 W and 102 and 42 W respectively. Thus, the useful energy without and with top covers is 38 and 59% respectively of the total energy supplied by the PSAH (345 W).
期刊介绍：
Applied Solar Energy is an international peer reviewed journal covers various topics of research and development studies on solar energy conversion and use: photovoltaics, thermophotovoltaics, water heaters, passive solar heating systems, drying of agricultural production, water desalination, solar radiation condensers, operation of Big Solar Oven, combined use of solar energy and traditional energy sources, new semiconductors for solar cells and thermophotovoltaic system photocells, engines for autonomous solar stations.
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