Abstract
In the current investigation, two hot water storage tank integrated evacuated tube collector systems have been designed and fabricated. In one of the systems, an evacuated tube integrated with PCM (phase change material) is termed a testing system while another evacuated tube system was left without PCM termed a reference system. Based on the experimental results, it has been found that the incorporation of paraffin wax in the testing system improved the thermal energy output. Also, the thermal cycling of selected PCM has undergone up to 1500 cycles and results showed very negligible changes in its chemical and thermal properties. The useful energy output of the system with PCM has been improved by 36.81 %, 26.97 %, and 22.72 % for Run_40oC, Run_45oC, and Run_50oC respectively. In addition to this, extra hot water obtained from the testing system was 14 L for Run_40oC, 5 L for Run_45oC, and 6 L for Run_50oC respectively as compared to the reference system. Concerning techno-economic analysis, on average, the value of per litre cost of production of hot water (CPL) by the proposed system and electric water heater was observed to be INR 0.16 and INR 0.48 respectively. The net present value of the proposed system was found to be approximately INR 11598 and total expenditure on the proposed system can be recovered after 4.07 years which is much shorter compared to the life of the proposed system.The present work removes the overheating issue of heat pipes and improves the performance of the system by modifying in design and utilization of paraffin wax as heat storage material.
Published Version
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