*Article* **A Simplified Thermal Comfort Calculation Method of Radiant Floor Cooling Technology for Office Buildings in Northern China**

**Xiaolong Wang 1,†, Tian Mu 2,†, Lili Zhang 1, Wenke Zhang 1,\* and Linhua Zhang 1,\***


**Abstract:** The increasing application of floor heating technology promotes the development of floor radiant cooling technology (abbreviated as FRC technology). Many office buildings in northern China try to use FRC technology to cool in summer, but thermal comfort is the key problem restricting the promotion of this technology. The thermal comfort problems of an office room with floor radiant cooling were studied in this paper by the methods of numerical simulation, control variable, and data fitting, and the experimental results were verified in multiple ways. It was found that, for an office room using floor radiant cooling, the effect of the floor surface temperature on thermal comfort was about 16%, while the effect of indoor air temperature was about 84%, and relative humidity had little effect on thermal comfort. A simplified thermal comfort calculation model was proposed, which could be used as an indicator to adjust the floor surface and indoor air temperature, or could be used to calculate the *PMV-PPD* value. The findings have guiding significance for the design and control of FRC technology.

**Keywords:** thermal comfort; *PMV-PPD*; radiant floor; cooling; office buildings
