- Volume 28 Issue 1
Adjacent housing units suffer inevitable thermal losses if an unheated unit exists in an apartment building. Thermal loss of the units adjoining the unheated apartment can be neglected because the contact area is small and insulators are located in the walls. When insulators are not included in the slab between the upper and lower units, 70% of the heat supplied by an Ondol system may be used in the original unit, but 30% is transferred to the unit on the lower floor. Another 30% can be obtained from the ceiling if the upper floor housing unit is heated. This strong thermal connection is a characteristic of Ondol heating in apartment buildings. When there is an unheated unit, the lower floor unit uses 42.3% more heating energy if there is no insulation and 19.5% if a 35 mm insulator is used as in the current guidelines. Therefore, much thicker insulation should be applied to weaken the thermal connection.
Heating energy;Ondol;Insulation;Apartment house;Heat loss;Thermal connection
- Korean National Statistical Office, 2000, The census of population and residence 2000, Report of residence, pp. 44-45.
- Won, D. H. and Kim, H. G., 2008, The economics value of residential heating systems in house price, Korean energy economic review, Vol. 7, No. 2, pp. 75-101.
- Park, J. W., Yoon, J. H., Kwak, H. Y., Lee, J. B., and Shin, U. C., 2013, A study on building energy demand for design of energy system on green home apartment, Korean J. of Solar Energy Society, Vol. 33, No. 1, pp. 24-31.
- Lee, E. J. and Hong, H., 2013, Thermal effect by non-heating apartment housing unit, the 6th Korean congress of refrigeration, pp. 41-44.
- Kim, J. W., Seo, S. M., Kim, Y. H., Cho, S. K., and Park, J. C., 2011, A Study on thermal environmental and energy consumption by using convective and radiant heating, SAREK Summer Conf., pp. 124-127.
- Hong, H. and Kim, S. W., 2010, Adjustment of valve opening in Ondol hot water distributor, Korean J. of Air-Conditioning and Refrigeration Engineering, Vol. 22, No. 6, pp. 460-467.
- Hong, S. K., Kim, J. W., Lyu, S. B., and Cho, S. H., 2011, An experimental study of predictive optimal control for apartment house, Proceeding of the SAREK Summer Conference, pp. 1343-1348.
- Park, Y. W., Yoo, H., and Hong, H., 2005, Analysis of heating energy in a Korean-style apartment building 3:The effect of room condition settings, Korean J. of Air-Conditioning and Refrigeration Engineering, Vol. 17, No. 8, pp. 722-728.
- Lee, E. J., Lee, D. Y., Hong, H., and Kim, Y. G., 2012, Ondol heating simulation for district heating household, SAREK Winter Conf., pp. 105-108.
- Lee, E. J., Lee, D. Y., Hong, H. and Kim, Y. G., 2014, Measurement and simulation of heating energy for apartments with district heating, Korean J. of Air-Conditioning and Refrigeration Engineering, Vol. 26, No. 128, pp. 572-578. https://doi.org/10.6110/KJACR.2014.26.12.572
- Kim, D. G. and Kim, S. H., 2011, A study on the indoor air quality in the bedroom with respect to temperature and humidity conditions, Journal of the KIEAE, Vol. 11, No. 3, pp. 31-36.