The most common include ammonia, Freon (and other chlorofluorocarbon refrigerants, aka CFCs) , and HFC-134a (a non-toxic hydrofluorocarbon). The Vapor-Compression Refrigeration Cycle is comprised of four steps.
Which device is used for expansion of refrigerant in Vapour compression refrigeration cycle?
Figure 1 depicts a typical, single-stage vapor-compression system. All such systems have four components: a compressor, a condenser, a metering device or thermal expansion valve (also called a throttle valve), and an evaporator.
What is used for expansion in Vapour refrigeration cycle?
10. In the expansion process, which of the following remains constant? Explanation: The expansion is an adiabatic throttling process in which enthalpy remains unchanged. Explanation: This is the COP of vapour refrigeration cycle.
What is the refrigerant used in Vapour absorption cycle?
Ammonia is used as a refrigerant, & water is used as an absorbent. A solution of these two is formed because water has a strong affinity for ammonia. Water plus ammonia solutions are present inside the absorber.
Is a device which is used to expand the Vapour refrigerant and delivers it to evaporator?
A thermal expansion valve or thermostatic expansion valve (often abbreviated as TEV, TXV, or TX valve) is a component in vapor-compression refrigeration and air conditioning systems that controls the amount of refrigerant released into the evaporator and is intended to regulate the superheat of the refrigerant that ...
Which of the following are the main components of Vapour compression system?
The Vapor Compression Refrigeration Cycle involves four components: compressor, condenser, expansion valve/throttle valve and evaporator . It is a compression process, whose aim is to raise the refrigerant pressure, as it flows from an evaporator.
What is the most commonly used refrigerant?
- Chlorofluorocarbons (CFCs), including R12. This is known to contribute to the greenhouse gas effect. ...
- Hydrochlorofluorocarbons (HCFCs), including R22. ...
- Hydrofluorocarbons (HFCs), including R410A and R134.
What are the four stages of refrigeration?
The refrigeration cycle contains four major components: the compressor, condenser, expansion device, and evaporator .
Which cycle is used in refrigeration?
The vapor-compression refrigeration is the most widely used cycle for refrigerators, air- conditioners, and heat pumps.
What happens in actual Vapour compression cycle?
In a vapour compression refrigeration system, refrigeration is obtained as the refrigerant evaporates at low temperatures . The input to the system is in the form of mechanical energy required to run the compressor. Hence these systems are also called as mechanical refrigeration systems.
Which energy is used in vapour absorption system?
The vapour absorption system uses heat energy , instead of mechanical energy as in vapour compression systems, in order to change the conditions of the refrigerant required for the operation of the refrigeration cycle.
What are the major components of VAR system?
- 2 Absorber: The absorber is used to absorb the refrigerant. ...
- 3 Pump: The pump will pump the strong solution of ammonia and water from the absorber to the generator.
- 3 Generator: ...
- 4 Analyzer: ...
- 5 Pressure Reducing Valve: ...
- 5 Condenser: ...
- 6 Expansion Valve:
Why does the compression refrigeration cycle have a high pressure side?
“high side” removes the oil entrained in the discharge gas and returns it to the compressor crankcase . “high side” allows the technician to visually see the dcondition of the refrigerant in the line.
What is the difference between evaporator and condenser?
Evaporator Coils vs. Condenser Coils. The evaporator coil is the part of an air-conditioning system that removes heat and moisture from indoor air to cool it. The condenser coil takes that heat and releases it outside .
Which one of the following is NOT effect of liquid subcooling?
4. Which one of the following is not effect of liquid sub cooling? Explanation: Sub cooling the liquid reduces the compressor power per ton of refrigeration due to reduced mass flow rate of refrigerant .
