부산대학교 도서관

The element core which is really conduct heat exchange is a important component of the heat recovery ventilation system. When it is polluted and destroyed by condensation, polluted air is flowing into indoor and heat exchange rate is decrease. But the element core was not included in condensation detected range. This study was conducted to examine the applicability of condensation prevention according to the supply & exhaust air flow ratio control without additory equipment configuration. Experiments was conducted to the supply & exhaust air flow ratio 1.0:1.0 to 1.0:2.5 in winter outside temperature(-6.0℃ to -15.0℃) and condensation of the element core was judged with the hydrochromic detection sheet. The hydrochromic detection sheet was made by the hydrochromic ink which is changed the color when it contact water, the hydrochromic detection sheet could detect condensation in the element core which could be not detect by naked eyes. As a result, as the supply & exhaust air flow ratio increased, the condensation decreased. The lower outside temperature, the larger the supply & exhaust air flow ratio which was required to prevent condensation. In order to raise applicability of the supply & exhaust air flow ratio control, the study configured exhaust air temperature(the minimum exhaust air temperature 2.5℃ when condensation was not occured) as control criterion and established a control algorithm. Because heat exchange rate and condensation occur condition are changed according to the material and form of element core, In order to generalization of this algorithm, It is necessary to classify element core by property and conduct various experiments.