시스템에어컨의 저압측 냉매분지관용 단열재의 결로 현상에 대한 연구

Abstract

This study deduces the following through experiments on a pre-shaped Y-type branch pipe fabrication, a type of pipe for the refrigerant of multi-air conditioner. This study also suggests possible improvements of the products that are being developed. (1) The thermal insulation applied to this product cannot completely prevent the dew condensation under the test standards of DBT 27℃and RH 95% if the temperature of the liquid inside the pipe is 5℃ or 10℃. (2) In order to prevent the dew condensation with this thermal insulation under the test standards of DBT 27℃ and RH 95%, a thickness over 44mm is required if the temperature of liquid inside of the pipe is 5℃, and a thickness of over 36 mm is required under 10℃. (3) In order to prevent the dew condensation with the thickness of the thermal insulation applied to this product, a temperature lower than the dew point of 23.1℃ is required if the temperature of the liquid inside the pipe is 5℃, and a temperature lower than the dew point of 24.6℃ is required if the temperature of the liquid inside of the pipe is 10℃ in the outside air conditions. (4) In order to prevent the dew condensation with a thermal insulation with a thickness of 14.76 mm under the test standards of DBT 27℃ and RH 95%, the thermal conductivity of insulation should be less than 0.008 W/mK if the temperature of the liquid inside of the pipe is 5℃, and the thermal conductivity of insulation should be less than 0.001 W/mK under 10℃