A Simulation Study Of Domestic Hot Water Using TRNSYS

Purusothma Naido, Logan Naidu (2020) A Simulation Study Of Domestic Hot Water Using TRNSYS. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The solar flat plate collector is a widely used application to harness the solar energy given by the sun for almost every industry. In this study, the flat plate solar collector used in Melaka City and the industry is investigated. The key to the successful performance of the flat plate collectors depends on the areas of the collector and also the number of collectors installed correctly into the position of the sun. The components, the inputs and the parameters affecting the performance of the flat plate collector are the temperature difference and the efficiency of the entire solar system. Thus, Transient Systems Simulation (TRNSYS) program simulation is conducted to reduce the experimentation time and avoid high experimental and design cost. The objectives of this project are to obtain the performance of flat plate solar collector by using TRNSYS as well as to determine the suitable number of collectors for domestic hot water in Melaka City by using Hottell-Whillier-Bliss equation in TRNSYS and also to find out the suitable surface areas of the flat plate solar collector according to the industry specifications and needs. A validation result of a journal studying the performance of flat plate solar collector installed in a location is carried out to find the temperature difference in the flat plate collector and also to prove that the TRNSYS simulation produce is acceptable. For the validation, the weather data of Karaikudi 2014 is generated to find out the performance of flat plate collector. The component such as the flat plate collector, the stratified tank, pump, diverter and tee piece input and parameter were inserted to produce a precise simulation outcome. The Temperature input and the Temperature Output (TiColl and ToColl) is compared to find out the performance. The same process is then repeated using the Melaka City weather data and simulated in terms of the TiColl and ToColl to find out how the flat plate collector perform in the city. To achieve the objective the temperature difference is taken with the high-temperature difference will indicate good performance level. For the second objective which is to determine the suitable number of collectors for domestic hot water in Melaka City, the annual fraction load data of Melaka city 2016 is taken. The data shows that Melaka city has an average monthly heating load of domestic hot water in Melaka. To find a suitable number of solar collectors, the normal efficiency of flat plate solar collector must be around 70%. The solar energy supply to the users is 78.42% which is higher than the optimum efficiency of the solar collector. The domestic hot water temperature that is produced using the TRNSYS is shown. A single flat plate collector of 2.5m2 is enough for an average household in Melaka City. For the third objective, which is to find out the suitable surface areas of the flat plate solar collector according to the industry specifications and needs. The industry locations that have been chosen for this study is the Hospital Universiti Kebangsaan Malaysia in Cheras, HUKM. The simulation will use the series 5 MY-60 flat plate collector from MYSOLAR CONCEPT SDN BHD. Based on the simulation, the suitable total area needed to produce the hourly average of the storage tank water temperature is 1800m2. This area includes a total of 360 number of panels required to be installed in the hospital with the maximum average area of 5m2.

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