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The main aspects are summarized as follows: * thermal comfort depends on air temperature and on mean radiant temperature (combined into the operative temperature), while the control of the systems is usually carried out by air temperature (Olesen 2001,2002a; Simone 2009; Berglund and Berglund 1994); * radiant systems are not only HVAC components but also envelope components affecting the energy balance; * radiant systems contain both radiant and convective equipment, while the HVAC reference system is only convective equipment (e.
INTRODUCTION Radiant panel heating and cooling systems are temperature-controlled indoor surfaces that maintain sensible thermal comfort primarily by controlling the operative temperature (OT) and the Mean Radiant Temperature (MRT).
The uniform thermal environment represents the uniform space where the air temperature is equal to the mean radiant temperature, the air current is steady, and there is no vertical gradient in temperature.
THEORY All three indexes were developed in terms of the dry-bulb air temperature and/or the mean radiant temperature in the following forms.
The mean radiant temperature makes possible to observe radiant interchange between man and environment.
The mean radiant temperature was calculated from the globe temperature using Equation 9 (forced convection) of Annex B of ISO 7726 (ISO 1998).
The first step was to analyze the space conditions and mean radiant temperatures in the space.
The data produce the following parameters (Parsons 1993): Environmental parameters: mean radiant temperature ([t.