TESY HPWH 2.1 200 U02, Руководство по обслуживанию

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A. OPERATING PRINCIPLE
The equipment is capable of producing domestic hot water mainly by using heat pump technology. A heat pump is capable of transferring thermal energy from a low temperature
source to another with a higher temperature and vice versa.
The equipment uses circuit consisting of a compressor, an evaporator, a condenser and a throttle valve; a liquid/gas coolant flows inside this circuit (see paragraph 4.6).
The compressor creates a difference in pressure inside the circuit that allows a thermodynamic cycle to be obtained: this sucks the coolant fluid in through an evaporator, where the
fluid itself evaporates at a low pressure by absorbing heat; it is compressed and driven towards the condenser where the fluid condenses at a high pressure releasing the absorbed heat. After
the condenser, the fluid passes through the so-
called “throttle valve” and by losing pressure and the temperature starts to vaporize, it re-enters the evaporator and the cycle starts all over
again.
The operating principle of the equipment is as follows (Fig. 1):
I-II: The coolant fluid sucked in by the compressor, flows inside
the evaporator and while it evaporates, it absorbs the “ecological” heat given by the air. At the same time, the ambient air is
sucked in by the equipment by a fan; the air loses it heat by passing over the finned-tube battery of the evaporator;
II-III: The coolant gas passes inside the compressor and it under goes an increase in pressure that causes a rise in temperature; transforming this into superheated steam;
III-IV: Inside the condenser, the coolant gas releases its heat to the water inside the tank (boiler). This exchange process makes it possible for the coolant to pass from superheated steam to
a liquid state by condensing at a constant pressure and undergoing a reduction in temperature;
IV-I: The liquid coolant passes through the throttle valve; it undergoes a sudden drop in both pressure and temperature and it partially vaporizes bringing pressure and temperature back to the
initial conditions. The thermodynamic cycle can begin.