Insulation and Air Tightness of Six Low-Energy Houses at Hjortekaer, Denmark

摘要

In 1978-1979 six detached single-family houses were built at Hjortekaer, north of Copenhagen, as six different prototype low energy houses. In this report, a few typical construction details are described, some details having been chosen to illustrate solutions to the problem of cold bridges, others to demonstrate ways of obtaining airtight constructions. The infiltration air change rate has been measured a number of times by the tracer gas decay method, showing results ranging from 0.02 to 0.12 a.c.h. Also, pressurization and depressurization tests have been made - the results of these tests and the possible correlation with the air change rate are discussed. The total heat loss is worked out from the meter readings, allowing for the solar heat gain. The transmission heat loss (ranging from approx 70 to 155 W/C) is found by deducting the infiltration heat loss (mostly less than 10% of the total), and the result is compared to the calculated heat loss, based on the actual temperatures and the theoretical U-values. The calculated and the measured transmission heat loss differ less than 15%. By means of regression analysis of the thermal calibration data three different models for heat loss equations are tested. (ERA citation 10:031266)