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Refrigerant condensing temp. should be higher than the exiting water temperature?
Wiki User
∙ 13y ago
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.
Wiki User
∙ 13y ago
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Why do refrigerants trun from liquid to gas?
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.
When removing oil from a low pressure system the temperature should be 130 degrees f because?
Less refrigerant will be contained in the oil at the higher temperature
What is the low side and high side pressure for r410a?
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.
Which refrigerant has the highest boiling temperatures at atmospheric pressure?
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.
Does refrigerant enter the compressor as a low temperature low pressure gas?
Yes. The basic components of the refrigeration system are the refrigerant, compressor, condenser and receiver, expansion device and the evaporator. One cycle: Refrigerant travels to Compressor (A) to Condenser (B) to Expansion device (C) to evaporator (D). The refrigerant gas at low pressure and temperature is drawn into the compressor. The gas is compressed to a higher pressure, which causes an increase in the temperature. The refrigerant gas at a high pressure and temperature passes to the condenser (point B), where it is cooled (the refrigerant gives up its latent heat) and then condenses to a liquid. The high pressure, low temperature liquid is collected in the receiver. The high pressure liquid is routed through an expansion valve (point C), where it undergoes an abrupt reduction in pressure. That pressure reduction causes part of the liquid to immediately vaporize or flash. The vapor and remaining liquid are cooled to the saturation temperature (boiling point) of the liquid at the reduced pressure. At this point most of the refrigerant is a liquid. The boiling point of the liquid is low, due to the low pressure. When the liquid refrigerant enters the evaporator (point D), it absorbs heat from the process and boils. The refrigerant gas is now at low pressure and temperature, and enters the suction side of the compressor, completing the cycle.
Will ac consume less power during winter?
Air conditioning usually consumes less power in winter, but mainly because it isn't needed as much. You should expect the air moving parts of the machine to have litttle interest in the outdoor air temperature. You might expect that the refrigerant compressor would consume less power in the winter because the the condensing temperature and head pressure would be lower. In practice, the the A/C must limit the system condensing temperature and maintain a higher head pressure to avoid the compressor oil being pumped out and/or liquid refrigerant being returned instead of vapor and damaging the compressor. Head pressure controls often begin to maintain condensing pressure and temperature at roughly 80°F, below which the condenser fans are either slowed or cycled on and off. Larger systems will employ additional safeguards. Any electrical savings from the condenser fan running slower or less often are made up for by a compressor heater that runs in the compressor off cycle to keep refrigerant from condensing in a cold compresssor shell and filling it with liquid refrigerant that would result in damage when it started. Simple systems lacking head pressure controls risk shortened operating life below 60°F and may suffer compressor damage at lower temperatures. So... if you are looking for efficiency in data center cooling in a cold area, the A/C itself won't help. A more complex system with a chilled water loop may be configured to use either refrigeration or simple heat exchange. Air to Air heat exchangers can also be employed.
How does temperature affect condensation?
At the point of condensation, the temperature of the condensing substance remains constant. However, the condensation was caused by lowering temperatures, so unless an outside source began heating the substance while it was condensing, the substance will continue to drop in temperature after condensing.
What is the function of condencer in refrigerator?
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.
What is the function of the condencer?
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.
What is the advantage of rankine reheat cycle?
Among other advantages, this pervents the vapor from condensing during its expansion which can seriusly damage he turbine blades, and improves he efficiency of the cycle, as more of the heat flow into the cycle occurs at higher temperature.
Does outside temperature affect how well a window AC cools?
Yes, the outside air is used to "cool" the refrigeration lines in the condenser. So the higher the outside air, the less the refrigerant is cooled down causing the units capacity to be less and less as the temperature rises.
What is the Refrigerant ammonia?
Refrigerant ammonia also is the Refrigerant r717,it is purity of 99.98% or more of anhydrous ammonia, relative to ordinary ammonia, the refrigeration level of ammonia on water vapor and magazine requirements are higher.
