Determining stability of temperature control and power consumption characteristics The BSRIA test objectives were to determine the heater’s performance under conditions which mimicked a full 24-hour heating cycle with daytime operation followed by a night set back condition.
The testing undertaken by BSRIA incorporated the principles and methods from BS EN 60675:1995 “Household electric direct acting room heaters.Methods for measuring performance.”
16-hour chart of air temperature and instantaneous power 7 different temperature probes recorded the temperature variation across the height of the room from 0.3m to 2.2m and also measured the mean radiant room temperature.
The results show an incredibly close temperature control of +/- 0.5 degrees Celsius, but, perhaps more importantly, from floor to ceiling.
Even heat distribution is vital for a comfortable experience.
Heater surface-temperature testing. In addition to the air temperature probes, positioned vertically in the centre of the room, eight resistance thermometers were attached to and around the radiator. An eight hour test period shows the hottest part of the radiator (as would be expected), to be the upper part. Crucially, the temperature during this test never exceeded 38°C.
Heater performance: equivalent outside air temperatures with fixed internal temperature of 21°C
BSRIA used the performance data from its tests to make calculations to determine the equivalent outside air temperature required to obtain the same heat loss in the test chamber as obtained using the water-cooled ceiling (cooling load). It can be seen in the first column of the graph, for example, that the amount of heat removed from the test chamber was equivalent to having the heater maintain 21°C inside when the outside temperature was minus 51°C!