DBPapers
DOI: 10.5593/SGEM2014/B41/S17.021

EFFICIENCY OF PRODUCTION AND DELIVERY OF HOT WATER OBTAINED FROM WASTE HEAT

I. Dosa, D. C. Petrilean
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-15-5 / ISSN 1314-2704, June 19-25, 2014, Book 4, Vol. 1, 157-164 pp

ABSTRACT
A steam condenser could reject a great amount of heat. Recovering this amount of heat can be done using heat pumps, but is difficult to find heat consumers because of the amount of heat and usually the long operation time of turbine. Underground mines can be matching heat consumers as they need hot water and mining is basically a continuous process. Exergy efficiency of heat pump is studied for different temperatures as cooling water temperatures at condenser outlet can vary depending on climatic factors from 18 to 30 °C. Exergy analysis of hot water delivery network was also carried out in order to establish overall exergy efficiency of production and delivery, which is found to be 42.57% a far better value than typical exergy efficiency of cogeneration plants 30.7% or 25% for boiler units. Heat pump coefficient of performance varies from 2.66 to 3.29 while work supplied to compressor decreases from 265.613 kW to 214.146 kW. The primary energy resources savings calculated varies from 8.56% to 21.41%.

Keywords: waste heat, steam condenser, heat pump, exergy efficiency