Purpose Of The Heat Pump; Application; Operating Principle - Dimplex LI 2M Instructions D'installation Et D'utilisation

2 Purpose of the Heat
Pump

2.1 Application

The heat pump module LI 2M allows the use of waste heat from
unpolluted air. In the simplest scenario, the device ready to be
plugged in draws in the warm air directly via the built-in radial
ventilator and cools it down. The refrigerating circuit "pumps" the
extracted heat to a usable temperature level and discharges it
again via a heat exchanger. The heating water circuit, to be con-
nected externally, directs the usable waste heat to the heating
system or a water tank with integrated heat exchanger.
Maximum efficiency is achieved when the heat pump module is
operated on a low temperature level, e.g. to heat a preheating
stage during hot water preparation. (The principal device integra-
tion is shown in the appendix)
The heat pump is designed exclusively for heating domestic hot
water and heating water!
The heat pump via the heat exchanger is suitable for mono-en-
ergy operation down to an external air temperature of 0 °C.
Proper defrosting of the evaporator is guaranteed by maintaining
a heating water return flow temperature of more than 18 °C or 20
°C (see Appendix Operating Range) during continuous opera-
tion.
Not permitted:
operating the pump with solvent-based or explosive exhaust
air
connecting extractor hoods to the ventilation system
utilising waste air containing grease residues
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2.2 Operating Principle

Outside or surrounding air is drawn in by the ventilator and fed
via the evaporator (heat exchanger). The evaporator cools the
air, i.e. it extracts heat from it. This extracted heat is then trans-
ferred to the working medium (refrigerant) in the evaporator.
The heat is "pumped" to a higher temperature level by increasing
its pressure with the aid of an electrically-driven compressor. It is
then transferred to the heating water using the liquefier (heat ex-
changer).
Electrical energy is used to raise the temperature of the heat in
the environment to a higher level. Because the energy extracted
from the air is transferred to the heating water, this type of device
is called an air-to-water heat pump.
The air-to-water heat pump consists of the main components
evaporator, ventilator, expansion valve, compressor, liquefier
and electrical control system.
At low ambient temperatures, humidity accumulates on the evap-
orator in the form of frost, reducing the transfer of heat. The
evaporator is defrosted automatically by the heat pump as re-
quired. The adjacent figure shows the general setup of the heat
pump.
2.2
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