hajdu HB300 Manuel De Mise En Service, D'opération Et D'entretien page 60

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condenses into liquid while transferring its heat to the water, this heat exchanger is
defined as condenser.
3 – expansion valve: it is an equipment through which the cooling fluid passes
just when its pressure and temperature are reducing, following the expansion of the
liquid perceivably as a result of pipe cross-sectional area increase above the valve.
4 – second heat exchanger located in the upper part of the water heater,
which surface has been increased by fins. The second heat exchanger performs heat
exchange between the cooling fluid and the environmental air drifted artificially by
either the free source or by a special fan in a proper way. As in this phase, the
cooling fluid evaporates and extracts heat from the environmental air, this heat
exchanger is defined as evaporator.
As heat energy is able to flow from a higher temperature level to a lower
temperature level exclusively, the temperature of the cooling agent located in the
evaporator (4) has to be lower than the environmental air acting as free source, in the
same time, in order to transfer heat, the cooling agent located in the condenser (2)
has to possess a temperature higher than the temperature of the water to be heated
in the tank.
The temperature difference within the heat pump circuit is produced by the
compressor (1) located between the evaporator (4) and the condenser (2) and by the
expansion valve (3), due to physical features of the cooling fluid.
The efficiency of the heat pump circuit can be measured by the coefficient of
performance
(COP). COP is the ration of incoming energy into the appliance (in this case, it is the
heat transferred to the water to be heated) to the electric power used (by the
compressor and the supporting equipment of the appliance). COP may change
depending from the type of the heat pump and the related operational
circumstances. A value of 3 for COP means, for example that the heat pump
transfers 3 kWh to the material to be heated after 1 kWh electric power used, from
which 2 kWh is extracted from the free source. The rated COP values of HB300(C)
heat pump water heater are listed in table 2.10.1 containing technical data.
The temperatures of typical heat pump cycles, in connection with features of
the cooling fluid and the free source ensure heating of sanitary water located in the
aluminium pipe heat exchanger placed outside of
HB300(C) heat pump water heater up to a temperature of max. 60°C, besides
normal usage conditions. As HB300(C) heat pump water heater has been equipped
with a supplementary pipe radiator that provides further options: quicker obtaining of
operation with full capacity through combination of heat pump mode and pipe
radiator mode up to a temperature of max. 60°C that may be used after running of
antibacterial protective cycles. In order to ensure rational energy use during the
operation of the hot water tank, visual indicators call the attention of the user on the
fact that the appliance is not operated in the most efficient way if the pipe radiator is
active.
4.3. Water heating methods
The appliance operates using two types of power source. As a standalone
heat pump and/or using the electrical pipe radiator. Models HB300 C and C1
incorporate a heat exchanger pipe coal (for model HB300C). Hot water tank of type
HB300C can be used with multiple energy sources: indirectly from solar energy, or
gas-based, coal-based or other energy carriers; furthermore, the auxiliary electric
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