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Chrono-Proportional Room Temperature Control
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| Chrono-Proportional room temperature control, currently incorporated into many of Danfoss Randall’s domestic temperature controls, is proving to be a certain method of achieving extra energy savings, reducing CO2 emissions in homes and helping high-efficiency boilers attain peak performance. |
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As the name defines, chrono-proportional control is based upon regulating the amount of time for which the boiler fires instead of the temperature-event based On/Off cycling of a traditional room thermostat. In operation, each hour is split into sections (usually 3) and the controller calculates the proportion of these periods for which the boiler fires to maintain desired comfort level.
This modulating control mode provides a closer control band and faster reaction to temperature change resulting in improved energy savings and better home comfort.
Rapid thermostatic response is vital in enabling today’s mandatory high-efficiency boilers to maintain their condensing mode, by which they achieve peak performance. Chrono-proportional control easily enables this - but the slower reaction of many traditional On/Off thermostats can mean that boiler condensing mode is rarely achieved. Without being able to achieve condensing status these boilers cannot possibly achieve their SEDBUK ratings and deliver the energy-saving benefits expected.
Closely controlled in-house tests carried out by Danfoss Randall showed that if a property has only a simple mechanical thermostat installed, then the energy-saving benefits of a replacement high-efficiency condensing boiler will not be realised as the boiler will rarely be running in condensing mode. Switching to an on/off electronic room thermostat produces reductions of over 2% in both energy cost and carbon emissions.
However, the use of an electronic thermostat with chrono-proportional capability provides closer temperature control plus possible reductions of 10% in both fuel cost and carbon emissions.
The message, therefore, becomes very clear. When installers fit replacement boilers, they should ensure that the room temperature controls allow condensing mode to be achieved for most of the operating time. If they do not then an ideal solution would be to fit a chrono-proportional control unit such as the Danfoss Randall TP5000 Si programmable room thermostat, which is an advanced control suited to virtually all domestic applications. |
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