Heat loss from hot water flowing in a copper pipe insulated using air enclosed with a PVC pipe

A. Albayani; M. Mirmanto; S. Syahrul

doi:10.29303/dtm.v8i1.137

Heat loss from hot water flowing in a copper pipe insulated using air enclosed with a PVC pipe

A. Albayani, M. Mirmanto, S. Syahrul

Abstract

This paper presents investigations of heat loss from hot water flowing in an insulated copper pipe. Investigations were performed to know the heat loss from a copper pipe insulated using air enclosed with a PVC pipe. The fluid temperature used was kept at approximately 75°C in the entrance and its mass flow rate was around 12 g/s. The nominal copper pipe diameter was 6.35 mm; while the diameters of the PVC pipe were ranging from 12.7 mm to 5.08 mm. The length of the test section was approximately 3000 mm. The results show that the biggest heat loss is found using the bare copper pipe. When the copper pipe is insulated using air enclosed with a PVC pipe, the heat loss decreases with the increased PVC pipe diameters. The trend of the heat loss agrees with the critical insulation diameter theory.

Keywords

Heat loss; Copper pipe; Air; PVC pipe; Critical diameter theory

Full Text:

PDF

References

Abdulkareem S., Ogunmodede S., Aweda J.O., Abdulrahim A.T., Ajiboye T.K., Ahmed I.I., Adebisi J.A., 2016, Investigation of thermal insulation properties of biomass composites. International Journal of Technology, vol. 6, 989-999.

Hiller C., 2005, Hot water distribution system research – Phase I, Pier Final Project Report, Applied Energy Technology, California.

Holman J.P., 1997, Heat Transfer. 8th Edition, McGraw-Hill Inc., USA.

http://www. engineeringtoolbox .com/copper pipeheatlossd_19.html.

Ljubenko A., Zager A.P.M., 2011, Effects of hot-water-pipeline renovation in a district heating system, Journal Mechanical Engineering. 57, 834-842.

Lee S., Nagomi M., Yamaguchi S., Kurabuchi T., Ohira N., 2013, Evaluation of heat transfer coefficients in various air-conditioning modes by using thermal manikin, 13th Conference of International Building Performance Simulation Association, August 26-28, Chambery, France.

Mirmanto M., Sayoga I.M.A, Zulkarnain Z., 2016a, Pengaruh debit terhadap unjuk kerja alat penukar kalor dan penurunan suhu ruangan, Dinamika Teknik Mesin, 6(1), 1-7.

Mirmanto M., Sulistyowati E.D., Okariawan I.D.K., 2016b, Effect of radiator type on dryer room temperature distribution and heat transfer rate, JP Journal of Heat and Mass Transfer, 13(4), 511-532.

Mirmanto M., Sulistyowati E.D., Okariawan I.D.K., 2016c, Effect of radiator position and mass flux on the dryer room heat transfer rate, Results in Physics, 6, 139-144.

Mirmanto M., Syahrul S., Sulistyowati E.D., Okariawan I.D.K., 2017, Effect of inlet temperature and ventilation on heat transfer rate and water content removal of red chilies, Journal of Mechanical Science and Technology, 31(3), 1531-1537.

Morvay Z.K., Gvozdenac D.D., 2008, Applied industrial energy and environmental management, First Edition, Part III, John Wiley & Sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex, PO19 8SQ, United Kingdom.

Sadauskiene J., Buska A., Burlingis A., Bliudzius R., Gailius A., 2009, The effect of vertical air gaps to thermal transmittance of horizontal thermal insulating layer, Journal Civil Engineering and Management, 15(3), 309-315.

Xiao S., Luo Q., Li G., 2014, Analysis on transmission heat loss in hot water system of residential building, Journal Energy and Power Engineering, 8, 1913-1917.

DOI: https://doi.org/10.29303/dtm.v8i1.137