jailcd2024034: "The Comparison of Intermittent and Continuous Air Conditioning for Optimal Operation of Convection Integrated Direct Expansion Radiative HVAC Systems"

Abstract

This study examined the combination of convection and radiant air conditioning by adding direct expansion radiant panels to the existing refrigerant pipes in a series-connected manner. The survey was conducted through a questionnaire and thermal environment measurements in a university lecture room. TSV (Thermal Sensation Vote) and TCV (Thermal Comfort Vote) evaluated surveys. PMV and SET* evaluated thermal environment measurements. In conclusion, continuous air conditioning was more comfortable than intermittent air
conditioning. The ability to create a thermally neutral environment, particularly during heating, resulted in the highest percentage of people responding "comfortable" in the questionnaire survey and stable values for PMV and SET*. There was a 21.74% increase in the percentage of respondents who answered "neither" on continuous operation compared to intermittent operation, according to the TSVs for both days. Control of air conditioning using air temperature sensors had a flaw in evaluating radiant temperatures. This led to the
shutting down of radiant air conditioning during cooling, resulting in an uncomfortable environment.