Technical data
Selection and Dimensioning of Heat Pumps for Heating and Cooling 1.3.1.2
www.dimplex.de 5
Examining the sufficient size of the installed
heating element:
Total heat consumption at minimum external temperature
(Design)
– Heat output of the heat pump at minimum
external temperature
= Output of the electrical heating element, max. 6 kW
Assuming a minimum external temperature of -10 °C results in
the following dimensioning for the chosen example:
Fig. 1.1: Design of an air-to-water heat pump with heating element in mono
energy operation for 12 kW heat consumption and -10 °C min.
external temperature
The following options are then available:
LA 16TR in combination with 2 kW additional output of the
heating element and a theoretical bivalence point of -7 °C
LA 12TR in combination with 4 kW additional output of the
heating element and a theoretical bivalence point of -5 °C
LA 10MR in combination with 6 kW additional output of the
heating element and a theoretical bivalence point of 1 °C
The heat pump is then to be chosen according to the application
and the climatic conditions of the region where the heat pump is
to be installed.
Assuming a minimum external temperature of -10 °C results in
the following dimensioning for the chosen example:
Fig. 1.2: Design of an air-to-water heat pump with heating element in mono
energy operation for 12 kW heat consumption and 0 °C min.
external temperature
The following options are then available:
LA 12TR in combination with 2 kW additional output of the
heating element and a theoretical bivalence point of +1 °C
LA 10MR in combination with 4 kW additional output of the
heating element and a theoretical bivalence point of +6 °C
LA 8MR in combination with 6 kW additional output of the
heating element and a theoretical bivalence point of +7 °C
The heat pump is then to be chosen according to the application
and the climatic conditions of the region where the heat pump is
to be installed.
Dimensioning of a reversible brine-to-water heat
pump with mono energy operating mode:
In contrast to the mono energy operating mode of an air-to-water
heat pump, the required heat consumption (12 kW) of a brine-to-
water heat pump with monovalent operating mode must be
covered by the heat pump alone. This means, the design of the
brine-to-water heat pump must be adequate to cover the entire
heat consumption.
The design of a brine-to-water heat pump is made up of the
required heat consumption (section ) on the one hand but, on
the other hand, of the lowest possible brine inlet temperature
(section ). The design is to be entered in the diagram with the
characteristic curves of the various possible brine-to-water heat
pumps (see Fig. 1.3 on p. 5) as intersection of heat consumption
and minimum brine inlet temperature.
The brine-to-water heat pump must then be chosen so that its
heating output curve lies at or above the design.
Assuming a minimum brine inlet temperature of +3 °C results in
the following dimensioning for the chosen example:
Fig. 1.3: Design of a brine-to-water heat pump in monovalent operation at
12 kW heat consumption and a minimum brine inlet temperature of
+3 °C.
Based on the above boundary conditions, either the SI 10MR or
SI 12TR can be chosen, depending on the existing power supply
(single-phase or three-phase).
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