Example 1A typical gas condensing boilerused with panel radiators.Roomtemperature20 deg. C.Mean watertemperature70 deg. C.80 deg. C.The significanceof temperaturedifference onradiatorsThe temperature difference between the heat emitter( in this case a radiator ) and the the room temperature isknown as the Delta t.The examples opposite show the difference between aconventional heating system and a low temperature systemand how this alters the Delta t.Delta t(temperature difference)50 deg. C.60 deg. C.Water is supplied by the boiler to the radiator at 80 deg. C which cools as it passes through theradiator to 60 deg. C. The average (or mean) temperature of the radiator is therefore 70 deg. C.The air temperature in the living space is 20 deg. C – therefore the temperature differencebetween the radiator (heated to 70 deg. C) and the living space is 50 deg. C.This is known as Delta (meaning temperature change) t (meaning temperature).Delta t = 50 deg. CExample 2Low temperature heating systemwith heat pump as sourceRoomtemperature20 deg. C.Mean watertemperature42.5 deg. C.45 deg. C.Delta t(temperature difference)22.5 deg. C.40 deg. C.Water is supplied by the heat pump to the radiator at 45 deg. C which cools as it passes through theradiator to 40 deg. C. The average (or mean) temperature of the radiator is therefore 42.5 deg. C.The air temperature in the living space is 20 deg. C – therefore the temperature difference betweenthe radiator (heated to 42.5 deg. C) and the living space is 22.5 deg. C.Delta t = 22.5 deg. C.Heat pumps and how they are designed to work in different systems vary. This means that the flowtemperature (inlet to the radiator) can be different to the 45 deg. C shown above. However, it isalways significantly lower (at least 25 deg. C) than that of a boiler.Ready for the future. Today.1415
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