Questions regarding the cooling process of ice machines
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The unit is equipped with a York chiller; the refrigerant used is R1270 (propylene). The inlet temperature of the chilled water (containing 20% ethylene glycol) is 7 degrees, while the outlet temperature is 2 degrees. At the inlet of the chiller, the propylene vapor has a temperature of 1 degree and a pressure of around 0.5 MPa. The exhaust temperature of the compressor is over 60 degrees, with a pressure of around 1.5 MPa. The high-temperature, high-pressure propylene gas passes through an oil separator to separate from the oil, and then it is cooled in a condenser (cooled by circulating water, with an inlet temperature of 42 degrees and an outlet temperature of 39 degrees). After that, it goes through an economizer, where some of the propylene vapor returns to the compressor, while the liquid propylene enters the evaporator after being depressurized. There’s one thing I’m not quite clear about: how does the propylene gas, which is at high temperature and pressure at the compressor outlet, go through a process of cooling and pressure reduction to become liquid propylene that enters the evaporator? Also, how does the propylene vapor in the economizer get vaporized again? Could someone please explain this in detail?
Cooler, inlet 39, outlet 42
Find a book that explains the working principle of ice machines and take a look
Is there any relevant material? Please send some to me, student*. Thank you very much
Check the physical properties of propylene; the density and pressure of saturated gas vary at different temperatures. In a closed space, condensation occurs along with the release of latent heat.
The high-temperature and high-pressure propylene at the compressor outlet is cooled by a cooler using cooling water, resulting in propylene that is low-temperature and high-pressure (at this temperature, some of the propylene liquefies). The second question: An economizer is essentially a heat exchanger. The low-temperature, low-pressure propylene after the expansion valve exchanges heat with the low-temperature, high-pressure propylene coming from the cooler – although it is called low-temperature, its temperature is actually higher than that of the propylene after the expansion valve. This heat exchange serves to produce propylene gas, and it also allows the temperature before the expansion valve to become supercooled propylene, thereby enabling it to absorb more heat