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1.8 OPERATING PRINCIPLE OF THE VENTILATION HEAT PUMP WATER HEATER
The Ventilation Heat Pump Water heater consists
of an expansion valve (1), an air heat exchanger (2),
a compressor (3) and a water heat exchanger (4).
A refrigerant circulates in the closed system (5). In
the expansion valve, the pressure and temperature
of the refrigerant are lowered, which becomes
vaporous. It extracts heat from the air (6) via the air
heat exchanger. The vapour is then compressed by
the compressor. This increases the pressure and the
temperature (7). The heat is transferred to the water
via the water heat exchanger (8). And the cycle begins
anew. It is therefore possible to heat water with a low
temperature of 10 ºC to domestic hot water with a
temperature of 60 ºC. This makes it possible to create
four parts of energy (heat) from just one part of energy
(electricity).
1.9 CONFIGURATION
Congurations which are not allowed Consequences
Connection to the attic or loft space. When the insulation between the house and the attic is not
sufcient, through this connection the loss of heat may
increase. There is also the possibility that a growing of
moisture will happen at the ceiling of the rooms which are
directly below the attic. There is a chance that objects will
fall or dust will be drawn in by the VHW. This may reduce
the lifetime for the VHW.
The supply of air from a heated room by the VHW. The air which is drawn by the VHW is already warmed
by another heating source in the system. In this situation
the greatest benet of the VHW (the transmitting of ‘free’
energy into heat) is not used.
Connection to the mechanical ventilation. The volume of air required by the VHW isn’t suitable (380
/ 490 m/h) for the volume of air in a mechanical ventilation
(which is 100 m/u). Furthermore the vapor of grease and
dust in the ducts of the mechanical ventilation can circulate
through and that may cause a shorter lifetime for the VHW.
Making of a housing around the air outside or a repulsion of
fresh air inside. This will cause a big loss in the coefcient of performance
and a strong cooling in the room.
Connection to a ground heat exchanger. - Friction losses.
- Problems with the symmetrisation of the two fans inside
the ground heat exchanger.
- The evaporator will likely become clogged.
Also not allowed:
• Make a ventilation connection with a dryer.
• Install in dusty room.
• Take air in which contains solvents and / or explosive substances.
• Connect the VHW to an extractor fan wich drains oily and contaminated air.
• Install the VHW in a room where there is a change of frost.
• Install the VHW on top of the boiler.
• Install in an atmosphere which is chlorinated (e.g. a swimming pool) or uorinated.
• Install nearby sea areas or chemical plant
• Dusty air intake.
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