Description; General; Refrigerant Circuit (Heat Pump Operating Principle) - Dimplex BWP 30 HS Instructions D'installation Et D'utilisation

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Description

2.1 General

The domestic hot water heat pump is a ready-to-use heating
device 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 domestic hot
water preparation. The internal heat exchanger can be
connected to additional heat generators such as boilers and
solar energy systems. The devices are equipped with an electric
heating element (1.5 kW) as standard.
The temperature of the drawn-in air (the heat source) serves as
the reference value for the energy consumption and the domestic
hot water preparation heat-up time.
For this reason, an air duct system (DN 160, max. length 10 m)
can be connected to the standard spigot of the domestic hot
water heat pump for targeted waste heat recovery. For the heat
pump to be operated effectively, air short-circuits between the
drawn-in air and the blown-out air must always be avoided. This
can, for example, be achieved through the use of a flexible air
hose on the intake and outlet side.
Falling outlet 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 fulfils four functions:
Supplementary heating
The heat-up time is approximately 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 temperature falls below 8 ±1.5 °C. With the BWP
30HSD version, the
automatically, and heat pump operation 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 second heat generator via the internal
heat exchanger. 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.
Thermal disinfection
Using the operator panel keypad, domestic hot water
temperatures above 60 °C (up to 75 °C) can be programmed
via the "thermal disinfection" menu. Above 60 °C, these
temperatures are reached by the heating element. For
higher temperatures to be reached, the adjusting screw
(Chapt. 2.3 on page 4) on the temperature controller casing
must be turned to the right-hand stop.
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heating element switches
NOTE
When the domestic hot water temperature reaches > 60 °C, the heat
pump switches off and the domestic hot water preparation is heated
solely by the heating element. The factory setting for the heating element
controller is 65 °C.
2.2 Refrigerant circuit (heat pump
operating principle)
The refrigerant circuit is a closed system in which the R134a
refrigerant is the energy source. The finned heat exchanger
extracts heat from the drawn-in air at a low evaporation
temperature, and transfers it to the refrigerant. The vaporous
refrigerant is drawn in by a compressor, where it is compressed
to a higher pressure and temperature level before being
transported to the liquefier, where the heat absorbed in the
evaporator and part of the compressing energy is transferred to
the water. Subsequently, the high condensation pressure is
lowered to the evaporation pressure via a throttle mechanism
(expansion valve), and the refrigerant can again extract heat
from the drawn-in air in the evaporator.
on
2.2
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