A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Decentral pumps in heating systems - a new hydraulic approach
In the case of central heating systems in most European countries the field of emission and control comprises radiators and thermostatic valves. The distribution system with a circulation pump at the center delivers heating water, mostly with outdoor controlled supply temperature, to the emission system. Because of the varying demand of the emission system due to internal gains and solar radiation the mass flow must be reduced by the valve. In residential buildings the central circulation pump generally overpowers the pressure difference of the heat generator. A proportional controller (i.e. a thermostatic valve) will never able to deliver information about the heating demand of the room to the central circulation pump, therefore present heating systems are not really demand controlled with regard to the distribution A very new hydraulic approach in heating systems is the local installation of small circulation pumps at each emission system (i.e. radiator). These circulation pumps only have to support one emission system and therefore they are only in operation in the case of a heating demand in the room. They do not reduce a delivered mass flow with a valve by increasing the pressure difference in the distribution circuit. The local circulation pumps are speed controlled and therefore able to deliver heating water in accord with the demand. This could be mass flow depended as well as time depended. According to existing calculation methods rough calculations are made to estimate the possible energy savings in heating systems with decentral pumps compared to a standard distribution system with results as follows: Electrical energy demand: 31,1 % in one-family houses (if an additional central pump is necessary), 61,1 % in one-family houses (with well designed distribution to the distributor part) and 23,1 % in non residential buildings (with an additional central pump). Thermal energy demand: 18 % in general compared to emission systems with proportional controller.
Decentral pumps in heating systems - a new hydraulic approach
In the case of central heating systems in most European countries the field of emission and control comprises radiators and thermostatic valves. The distribution system with a circulation pump at the center delivers heating water, mostly with outdoor controlled supply temperature, to the emission system. Because of the varying demand of the emission system due to internal gains and solar radiation the mass flow must be reduced by the valve. In residential buildings the central circulation pump generally overpowers the pressure difference of the heat generator. A proportional controller (i.e. a thermostatic valve) will never able to deliver information about the heating demand of the room to the central circulation pump, therefore present heating systems are not really demand controlled with regard to the distribution A very new hydraulic approach in heating systems is the local installation of small circulation pumps at each emission system (i.e. radiator). These circulation pumps only have to support one emission system and therefore they are only in operation in the case of a heating demand in the room. They do not reduce a delivered mass flow with a valve by increasing the pressure difference in the distribution circuit. The local circulation pumps are speed controlled and therefore able to deliver heating water in accord with the demand. This could be mass flow depended as well as time depended. According to existing calculation methods rough calculations are made to estimate the possible energy savings in heating systems with decentral pumps compared to a standard distribution system with results as follows: Electrical energy demand: 31,1 % in one-family houses (if an additional central pump is necessary), 61,1 % in one-family houses (with well designed distribution to the distributor part) and 23,1 % in non residential buildings (with an additional central pump). Thermal energy demand: 18 % in general compared to emission systems with proportional controller.
Decentral pumps in heating systems - a new hydraulic approach
Hirschberg, Rainer (author)
2008
10 Seiten, 5 Bilder
(nicht paginiert)
Conference paper
Storage medium
English
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