Application study of radiant floor compo site air-conditioning system for heating and cooling

Abstract

Radiant floor air-conditioning systems are characterized by energy efficiency and comfort. However, at higher sensible heat loads and higher humidity conditions, problems such as condensation, poor comfort, slow thermal response, and difficulty in zoning control may occur. To mitigate these limitations, this study presents a composite air-conditioning system for radiant flooring that includes an air source heat pump., an underfloor coil, a fan coil and a dehumidifier for fresh outdoor air. The composite system was experimentally tested and analyzed for indoor thermal comfort under various operation modes in summer and winter in a specific thermal zone. On the basis of the experiments, the composite system comprises multiple energy supply points, and varying combinations between these functional endpoints can fulfill the comfort needs of the human body even in year-round working conditions. The radiant floor temperature varies from the dew point air temperature by roughly 7°C. Following the test day, summer radiant systems take approximately 30 minutes to reach the set indoor temperature and humidity level.. An hour after the indoor air has reached the desired temperature and humidity, the winter radiation system is activated.