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Refrigerant condensing temp. should be higher than the exiting water temperature?


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2011-02-20 02:06:05
2011-02-20 02:06:05

As rule of the thumb, refrigerant condensing temperature should between 1-2 degreeC higher than the exiting water temperature, this temperature difference is technically called condensing temperature approach. I f the approach is below or above means, system is flooded with refrigerant or system got starve. Above method is also effective in determining if the condenser shell needs maintenance for sclale, sludge build up removal.

I am refrigeration mechanic.

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This is because as the liquid passes through the refrigerator, it absorbs the heat from the food in the fridge. Therefore as heat is transferred from the food to the refrigerant, the following happen: - The temperature of the food falls - the temperature of the refrigerant rises. Thus, a higher temperature would change the refrigerant from liquid to gas.

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Less refrigerant will be contained in the oil at the higher temperature

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Technicians with R-22 experience will need to become familiar with working with high and low side pressures that are much higher when using R-410A. A typical R-22 system operating normally with a head pressure of 260 psig at a 120-degree condensing temperature and a low side pressure of 76 psig at a 45-degree evaporator saturation temperature will find the equivalent pressures in a R-410A system to be much higher. A normally operating R-410A system with the same condensing temperature of 120 degrees and a 45 degree evaporator saturation temperature will have a high side pressure of 418 psig and a low side pressure of 130 psig. Although refrigerant 410A is a near-azeotrope and has a slight temperature glide, there is no need to correct for refrigerant dew point and bubble point differences. Superheat and sub cooling calculations can be calculated the same way we have always done with R-22 refrigerant. The only difference will be the higher pressure-temperature relationship when reading the temperature-pressure chart. The temperature glide for R-410A is only .3 degrees Fahrenheit and can be ignored and fractionation is not a concern.

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The refrigerant plays a key role in achieving vapor cycle air ... After that, and until all the water has been evaporated, the remaining boiling liquid stays at the ... of the higher temperature of boiling resulting from increased pressure.

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Any refrigeration system (home air conditioner, refrigerator, automotive air conditioner...) uses the evaporation cycle of the refrigerant to remove heat from an object. The evaporation cycle of refrigeration systems is as follows: Refrigerant is compressed by the compressor. When the refrigerant is compressed the heat is forced into a smaller volume, raising the temperature of the refrigerant. The hotter refrigerant is then passed through a cooling coil, also called a condenser and air is passed across the hot coils, cooling the compressed refrigerant to room temperature, or close. The refrigerant, now under much higher pressure then changes state from a gas to a liquid. The refrigerant is then allowed to pass through an orifice, allowing the compressed refrigerant to expand. When the refrigerant expands it changes back to a gas, the temperature drops. The process is called "heat of vaporization". The chilled refrigerant is then passed through an expansion coil where something (air, water... whatever is being refrigerated) gets cooler. From there, the refrigerant is again compressed, starting the cycle over. As you can see, the condenser is essential to the refrigeration process. If the condenser develops a leak, the refrigerant is lost. If the condenser is kinked, refrigerant cannot get past. If air is blocked from passing over the condenser, the refrigerant cannot be cooled.


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