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Is the discharge gas from the compressor a high pressure high temperature superheated vapor?
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What temperature is superheated water?
Critical point is the state of water at which no latent heat is required to convert water into superheated steam. Above this point water directly converted into superheated steam. theoretically critical point of water is 221.4 bar and 374.2 deg C .
What is the component of a refrigeration system which changes a high pressure vapor to a high pressure liquid?
A brief discussion of the operating vapor-compression cycle is helpful to indicate other potential refrigeration problems in real systems. In the basic cycle, slightly subcooled refrigerant leaves the condenser at high pressure and flows into the liquid receiver if one is present. The refrigerant then enters the throttling device (capillary tube, TXV, etc.) where the pressure is dropped. It then enters the evaporator as a two-phase mixture (liquid and vapor) and evaporates or boils at low temperature, adsorbing heat. Slightly superheated refrigerant vapor exits the evaporator and enters the suction line accumulator, if one is present (used to trap any transient liquid slugs). The refrigerant vapor then enters the compressor where the pressure and temperature are increased as the compressor compresses the refrigerant vapor. The vapor leaving the compressor is superheated, and the compressor discharge is the hottest point in the cycle. This refrigerant is cooled and condensed in the condenser where heat is rejected, and the refrigerant is condensed to liquid. Refrigerant actually leaves the condenser slightly subcooled (subcooled liquid) to assure condensation has been complete. Any non-condensable vapors in the system will be unable to condense in the condenser and will appear as gas bubbles in the condensed liquid stream. These non-condensables may collect in the condenser and displace refrigerant from the condenser heat exchanger, thereby reducing the effective surface area of the condenser.The compressor changes the low pressure vapor to high pressure vapor sending it threw the condenser to cool and turn it back into liquid.
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.
What is meant by degree of superheat?
First of all, the term "superheated" generally refers to a vapor. This explanation refers to superheated vapor only. Superheat is the difference (in degrees of temperature) between a liquid's boiling point and the superheated vapor's actual temperature. For example; at sea level, the boiling point of water is 212ºF. As long as the temperature is 212ºF, you will have both liquid and vapor present. If you continue to add heat to the liquid/vapor mix, all the liquid will eventually become vapor. Additional heat added after no liquid remains will begin to increase the temperature above 212ºF. This resulting vapor is superheated. If you measure the temperature of water vapor to be 220ºF at 1 ATM, the vapor is superheated by 8ºF. The same analysis is true for any liquid/vapor, at any pressure and for any other temperature scale. i.e. R22 refrigerant is "saturated" (meaning both liquid and vapor are present) at 32ºF and 58PSIG. If you measure the pressure of R22 at 58PSIG but measure the temperature at 45ºF, you have measured 13 degrees of superheat. I hope this answer is useful to you. Bama Cracker Degree of superheat is the difference between the superheated temperature and the saturated temperature of the steam .
Why would your air conditioner have a normal to slightly high suction pressure and low head pressure with a 3 to 5 degree temperature difference?
What you're describing sounds suspiciously like a worn compressor.
How do you calculate pressure ratio of compressor?
Inlet pressure/discharge pressure
What does antisurge valve do in compressors?
The compressor antisurge valve opens to bypass flow from discharge to suction. This allows the compressor to flow through bypass and keeps the compressor from surging (reverse flow thru compressor). The discharge pressure does not continue to build due to closed discharge conditions.
What is suction and discharge head?
These are terms used by refrigeration and air conditioning techs. The suction is refrigerant returning to the compressor from the evaporator, or the low side. The high side is the discharge or head pressure, where high temperature high pressure gas leaves the compressor to flow into the condenser. These systems should only be worked on by licensed and experienced techs.
What is a brief description of the basic refrigeration cycle?
Starting at the compressor;Low pressure vapor refrigerant is compressed and discharged out of the compressor.The refrigerant at this point is a high temperature, high pressure, superheated vapor.The high pressure refrigerant flows to the condenser by way of the "Discharge Line".The condenser changes the high pressure refrigerant from a high temperature vapor to a low temperature liquid and leaves through the "Liquid Line".The high pressure refrigerant then flows through a filter dryer to the Thermal Expansion valve or TXV.The TXV meters the correct amount of liquid refrigerant into the evaporator.As the TXV meters the refrigerant, the high pressure liquid changes to a low pressure, low temperature, saturated vapor.This saturated vapor enters the evaporator and is changed to a low pressure dry vapor.The low pressure dry vapor is then returned to the compressor in the "Suction line".The cycle then starts over.
Does refrigerant exit the compressor as a high temperature high pressure liquid?
No , a high temperature high pressure ( gas )
What is surge limit in cetrifugal compressor?
Surge Limit is the Minimum Flow Point ( in the compressor characteristic curve ) below which the compressor operation become instable. If the flow-rate is reduced, the pressure developed by the compressor decreases. Then, the pressure in the discharge line becomes greater , and the gas flow back into the compressor. As soon as the pressure in the discharge line drops to below that developed by the compressor, the gas again flows in the discharge line. Then, the cycle repeats. The oscillating pressure and flow rate will cause audible vibrations and shocks, and could damage the compressor blades, seals, and other components. Therefore, the compressor requires an antisurge control system to limit the flow rate at a minimum point, safely away from the surge limit.
What is the required dischage pressure of R134a?
R-134A shares the same basic operating characteristics as R-12. There is no "required" discharge pressure. Most manufacturers of equipment use 100deg.F as a standard for condensing temperature, in rating the capacity of their units. Discharge pressure is dependent on quantity of charge, ambient outside temperature (condensing pressure), and suction pressure. These factors all control discharge pressure in a normally operating system. Throw in a compressor with valve leakage or piston ring/ seal issues and it gets more complicated. If this is an automotive related question, read the can. lc
What is relation between mass flow rate and discharge pressure in reciprocating compressor?
These have a inverse relation. You will need to know the discharge and the incoming pressure in order to find out the mass flow rate.
What is the role of a compressor in an air conditioner?
it increased the pressure and temperature of the refrigerant.
What is the role of compressor in a air conditioner?
it increased the pressure and temperature of the refrigerant.
What is compression ratio in air compressor?
The compression ratio is simply the ratio of the absolute stage discharge pressure to the absolute stage suction pressure.
What is compressor head as it relates to discharge pressure?
the head doesnt effect the output pressure of a compressor package but the size of the piston and the amount of clearence and volume between the piston and head changes your output psi
