Arrangement for controlling room temperature

Claim 1

An arrangement in the form of an electrical circuit or the like for controlling in common the room temperature of a group of rooms intended for human occupancy in a building or the like in accordance with the weather including the outside temperature by controlling the output of a heat transfer system, such as a heating system or a cooling system, for said group of rooms, including: timing means for defining a series of predetermined first and second time intervals, each of said second time intervals beginning at the end of a first time interval and ending at the beginning of the next successive first time interval; first system control means for controlling the output of said heat transfer system, i.e. the transfer of heat energy with respect to said group of rooms, during said first time intervals to maintain a normal room temperature value; system shut-off means for reducing the output of said heat transfer system to a minimum value at the beginning of said second time interval; maximum output means for increasing the output of said heat transfer means to a maximum value before the termination of said second time interval to effect a rapid transfer of heat energy with respect to said group of rooms, whereby as a result of the rapid heat transfer, the normal value for the room temperature is at least substantially attained toward the end of said second time interval; first computer means for computing the change to be expected in the room temperature as a result of said rapid heat transfer as a rapid heat transfer curve, taking into consideration building values, values of said heat transfer system and the instantaneous weather,; and second computer means for computing an actual value curve (T RJ ) of the room temperature (TR) from the beginning of each second time interval until the beginning of said rapid heat transfer, taking into consideration the building values, the values of said heat transfer system and the instantanteous weather; wherein said maximum output means includes first comparator means for initiating said rapid heat transfer whenever the actual value curve at that time attains the computed rapid heat transfer curve.