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2009-12-08

Room control

Room control (constant room temperature, exhaust air control) is used to maintain a constant temperature in the room. Room control is used when the temperature in the room is variable due to draughts, machinery heat loads, etc. The supply air temperature will vary depending on whether it is necessary to heat or to cool the premises. A sensor is located in the supply air duct which dictates a minimum and a maximum supply air temperature so that air which is too cold or too hot is not blown into the room. The mains sensor is located in the room or in the exhaust air duct (if it is necessary to assess the average temperatures in a number of rooms). The main sensor, together with the controller, determines the supply air temperature for each individual load. The controller is also able to control several actuators in sequence.

Room control

Regin's controllers have built-in cascade control. These, in turn, contain two controllers, P+PI or PI+PI. The first controller is connected to a sensor in the room and the other one to a sensor in the supply air duct. The controllers are connected so that the output signal from the first controller gives a change in the setpoint of the second controller.

A temperature devation in the room results in a shift of the duct controller setpoint. The size of the shift is determined by the cascade factor, CF. The cascade factor is defined as the shift of the duct controller setpoint that is set at a room temperature devation of 1 degree.

The main sensor is placed in the room or in the exhaust air to give the average temperature from several rooms. The main sensor determines the supply air temperature for each individual load. The controller is also able to control several actuators in sequence.

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