Reglering av värmesystem i flerbostadshus med individuell värmemätning

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Summary, in English

Indoor temperatures in multifamily houses are indirectly controlled by the outdoor temperature. The radiator supply temperature is a function of the outdoor temperature. This control principle cannot take into account for disturbances from people, electric appliances, airing, sun, and air leakage due to wind. A control setting with a suitable margin can avoid complaints, but may result in overheating and airing.

The obvious control principle with direct control of indoor temperature has been tested with good result in 1978. The exhaust air temperature was used as a measure of the indoor temperature.

LKF, Lund community housing company, has installed individual metering of heating costs using the indoor temperature in each flat. The research project aim was to use these temperature measurements and to test the control principle and compare the energy saving versus normal control and no individual metering of heating costs. The normal control has been extended with a limited proportional correction of the supply temperature.

The extended control gives a more constant indoor temperature, which is appreciated by the maintenance personnel. A comparison between 2009/2010 and 2011 shows that the heating cost is larger than the control group due to higher indoor temperature caused by limited extended control, low gain and improper selection of desired indoor temperature at start up.

The study has been performed with financial support from CERBOF - the Centre for Energy and Resource Efficient Construction and Facilities management.

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