Direct measurement keeps heat loss under control
A
Sequoia Technology product story
Edited by the Engineeringtalk editorial team
Jan 10, 2003
New heat control monitors that measure the rate of heating or cooling in buildings directly can save significantly on energy costs as well as providing improved control.
New heat control monitors that measure the rate of heating or cooling in buildings directly can save significantly on energy costs as well as providing improved control, according to supplier Sequoia Sensors.
Based on thermopile technology supplied by US specialist Vatell Corporation, the heat control monitors from Sequoia are fitted to the outer walls and windows of buildings, and measure the rate of heat loss or gain directly.
The signal from the system indicates the heating or cooling rate required to maintain temperature - allowing corrective changes to be made in the HVAC system immediately.
Traditional controls measure the temperature in the room directly.
By the time a change of temperature is detected, however, it can take some time to correct owing to the thermal mass of the building fabric and its contents.
Sequoia recommends that the heat control monitor is used as part of a four-sided zone setup, instead of a traditional floor-by-floor arrangement.
Large energy losses are reduced by lowering the amount of heat that must be taken away by the air conditioning for comfort control on the side of the building that is heated by the sun.
At the same time, the heat supplied to the shaded or wind-chilled side is automatically increased so that temperature control and comfort are improved.
The heat control monitor is easy to fit, and requires no maintenance.
It provides an output of 4 to 20mA, with a linear response to changes in heat inflow/outflow.
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