A Study of Waste-Heat Recovery Unit for Power Transformer

Abstract:

This study discussed the feasibility of developing a system to circulate the heat loss from the coil and iron core of the power transformer equipped for buildings during power supply to the heat recovery unit. This study affixed a copper tube into the transformer insulating oil, allowing the water to circulate at normal temperature in the coil tube, and absorb the heat energy generated by the transformer coil and iron core. The heat energy was then recovered and stored. A low tension power transformer (7.5 KV) was used in the experiment. The operation was carried out in transforming power supply mode to seek for the most suitable recovery unit for various occasions. The test results showed that if the hot water recovery efficiency is 50%, in the course of producing hot water, the mean temperature of 17.5 L normal temperature water can be increased from 20°C to 50°C, thus producing 12.5 kJ heat only spends about 34 min. The results proved that the recovery unit for the heat from the power transformer can benefit from heating, prolong the transformer's lifetime, increase the power supply efficiency, and reduce the air conditioning load to save energy and to reduce global warming.

• Periodical: Advanced Materials Research (Volumes 875-877)
• Pages: 1661-1665
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.875-877.1661
• Online since: February 2014
• Authors: Zi Jie Chien, Hung Pin Cho, Ching Song Jwo, Sih Li Chen, Yi Lun Lin
• Keywords: Green Energy, Heat Recovery, Refrigeration Heating, Solar Energy, Transformer

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