Which device is used for the expression of refrigerant in Vapour compression refrigeration cycle?
evaporator
What is the correct sequence of the refrigeration cycle?
The refrigeration cycle contains four major components: the compressor, condenser, expansion device, and evaporator. Refrigerant remains piped between these four components and is contained in the refrigerant loop. The refrigerant begins as a cool vapor and heads to the first component: the compressor.
Why do we need to change the pressure of the refrigerant in the cycle?
The refrigeration cycle collects this heat by sending the refrigerant at a low temperature and pressure into the evaporator within that room. To cool the refrigerant down it is passed through the expansion valve, this will reduce the pressure of the refrigerant by restricting how much can flow through the valve.
What components maintain the high and low pressures in an absorption refrigeration system?
The high side pressure allows the refrigerant to condense at a temperature higher than the outdoor temperature, releasing heat. 13-9)What components are responsible for maintaining the high and low pressures in a compression refrigeration system? The compressor and the metering device.
Which condition is maintained for refrigerant in high side of Vapour compression system?
Vapor pressure acts equally in all directions and affects the entire low or high side of a refrigeration system. As pressure increases, saturation temperature increases. As pressure decreases, so does saturation temperature. In fact, only at saturation are there pressure-temperature relationships for refrigerants.
Which of these helps to remove heat from the refrigerant and reduce pressure on the high side?
In an evaporator, flash gas occurs from the pressure drop between the high side and low side of the system. This pressure drop allows flash gas to absorb heat, which helps to cool the rest of the liquid refrigerant.
Which process absorbs heat from the cabinet in refrigerator?
Refrigerant absorbs heat from the food items. Refrigerant transfers the absorbed heat to the relatively cooler surroundings outside.
What is the state of the refrigerant in the suction line?
When the refrigerant exists in a liquid and vapor state, it is in a condition called saturated. Superheat is measured at the places where the only vapor is present (the suction line) and is the difference between the saturation temperature and the measured temperature.
What is the purpose of insulation on the suction line?
Insulating the suction line is done to prevent condensate from developing and dripping off. This condensate drip can cause water damage to the material under it or cause a slip hazard for people walking below it.
Which refrigerant pipe should be insulated and why?
A typical residential AC unit has two copper lines that both exit the building exterior and run to the outside condenser unit. Only one of these copper pipes, the cold line, should be insulated. This is called the “suction” pipe and is typically the larger of the two pipes.
Does condensate drain piping need to be insulated?
Condensate lines do not have to be insulated coming off the unit. Signs of water could be anything ie frozen coil at one time, cracked drain pan poor pitch ect. The discharge off a condinsate pump should be if used in heating season and in or discharing into unconditioned spaces.
Can you insulate a condensate pipe?
Insulate the Pipe If you can’t change the length or width of your condensate line, try insulating it. Wrap the PVC pipe with foam insulation for additional protection from the elements.
Should steam pipes be insulated?
According to the U.S. Department of Energy, “insulating steam distribution lines can typically reduce energy losses by 90% and help ensure proper steam pressure at plant equipment.” While this statistic can easily convince you that insulating your steam lines must be a priority, it doesn’t offer any advice on the best …
Why should PVC drain lines on rooftop units be insulated?
PVC drain lines on rooftop units should be insulated: To prevent deterioration of the PVC from exposure to UV.