1 The Effect of Heat Gain on the Performance of a Radiant Cooling System

A test cell that simulates a closed building with shaded windows is used to analyse the effects of the heat gain on the performance of a radiant cooling system. The cell has a light metal double-sloped roof at the outside, which acts as a nocturnal radiator and below this roof are hinged, lightweight and operable, reflecting panels that are closed during the day and open at night. The performance of the system is evaluated with different conductive heat gain coefficients and its performance can be defined as a function of the Ua value, which also affects the swing and temperature distribution. A lower Ua generates a higher temperature swing inside the cell and higher temperature differences between the upper and lower regions of the cell. Equations and figures that predict the performance of the cell as a function of the heat loss coefficient and the insulation levels of the wall are presented while in another paper other equations that predict the indoor maximum temperature as a function of the outdoor average temperature, the swing and the Ua value are presented. Conference topic: Methods and tools for design-assistanc