Technical data
68 | Project planning manual for heat pumps for heating and domestic hot water preparation | 01.2012 www.dimplex.de
6.2.2 Domestic hot water preparation with heat pumps
6.2.2 Integration Diagram
6.2.2.1 Integration for heating support
6.2.2.2 Integration for domestic hot water preparation
6.3 Heating domestic hot water with the domestic hot water heat pump
The domestic hot water heat pump is a ready-to-use heating de-
vice whose main components are a domestic hot water cylinder,
the components of the refrigerant, air and water circuits and the
control, regulation and monitoring devices required for automatic
operation. With the help of electrical energy, the domestic hot
water heat pump uses the heat stored in the drawn-in air for do-
mestic hot water preparation.
Falling exhaust air temperatures reduce heat pump's heat output
and increase the heat-up time. In order for the heat pump to be
operated economically, the air intake temperature should not fall
below 15°C.
The electric heating element fulfills four functions:
Supplementary heating
The heating-up period is approx. halved by switching on the
heating element in addition to the heat pump.
Frost protection
With the BWP 30HS version, the electric heating element
switches on automatically and heats the water (nominally) up to
the domestic hot water setpoint temperature if the air intake tem-
perature falls below 8 ±1.5 °C. With the BWP 30HSD version, the
heating element switches on automatically, and heat pump oper-
ation is deactivated, when this temperature falls below -8 ±1.5
°C. When the temperature is below 8 °C, the heating element is
switched on if the setpoint temperature has not been reached
after a period of 8 hours. This function is inactive if the domestic
water is heated by a 2nd heat generator via the internal heat ex-
changer. The domestic hot water temperature produced by the
heating element in the frost protection function may exceed the
set setpoint temperature.
Emergency heating
In the event of a heat pump fault, the domestic hot water supply
is maintained by the heating element.
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