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Analysis of Space Heating and Domestic Hot Water Charges of Apartment Buildings by Insulation Standards in South Korea

To evaluate the effectiveness of Korea’s insulation standards reinforcement, this study analyzed space heating and domestic hot water (DHW) charges in 2017 for 157,288 household in 207 apartment complexes that were completed from 1997 to 2016. The insulation standards applied to these apartments were revised three times (in 1987, 2001 and 2010). The Anderson-Darling test was used to review the normality of the space heating and DHW charges, showing that each p-value is greater than 0.05 and follows the normal distribution. The annual average space heating charges per unit area of apartments with the insulation standards of 1987 were $4.69/m2 a. The charges with the strengthen standards of 2001 and 2010 were $4.32/m2 a and $3.29/m2 a, respectively, which decreased by 7.9% and 23.8%. on the other hand, compared to each previous standard, DHW charges decreased by 12.5%, then increased by 3%, showing there’s no correlation between insulation standards reinforcement and DHW charges.