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Chrono-Proportional Control Saves Energy
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Tests carried out by Danfoss Randall explain why optimum performance from today’s mandatory high-efficiency condensing boilers can be difficult to achieve if existing heating controls are not updated. Chrono-proportional control, already incorporated into many Danfoss Randall thermostats, overcomes the problem.
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The Danfoss tests, conducted in a custom-built, fully-controlled test house, confirm that room thermostats operating in chrono-proportional mode can provide a 10% reduction in energy consumption and carbon emissions compared to conventional mechanical devices. Chrono-proportional control divides hours into pre-settable fixed time intervals (typically 3 or 6 for radiator systems) and the quick-reacting thermostat calculates the duration of the ON period required to maintain desired comfort levels.
Full efficiency of a condensing boiler relies on it operating in the condensing mode. Slow re-acting mechanical thermostats can allow the system water to cool too much, requiring full circulation before the condensing cycle becomes functional. Under low loads this might not occur at all, resulting in ‘non-condensing’ type boiler performance.
Due to their control operation and faster re-action, chrono-proportional thermostats ensure boilers remains in condensing mode more often than with conventional On/Off operation, even at low heat loads.
Danfoss Randall TP5000Si and TP7000 programmable room thermostats, plus the RET-B range of thermostats all incorporate chrono-proportional technology. |
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