What is the principle behind the working of a refrigerator?
The principle of refrigeration and cooling is very simple: it involves removing heat from one region and depositing it in another. When you pass a low-temperature liquid close to objects that you want to cool, heat from those objects is transferred to the liquid, which evaporates and takes away the heat in the process.
What are the two types of pressure controllers commonly used on refrigeration systems?
Four different types are differentiated:
- • capillary tube.
- • pressure-controlled expansion valve.
- • thermostatic expansion valve.
- • electronic expansion valve.
What is back pressure valve in refrigeration?
Back pressure valve is a spring loaded non-return valve. It is fitted just at the exit of the refrigerant from the evaporator coil in a multi temperature rooms system. This being fitted at the exit of the compartments whose temperature is set higher (usually at about 4-5 degrees centigrade).
Which of the following principles is refrigerator based?
principle of law of thermodynamics
A refrigerator works on the principle of law of thermodynamics.
What is expansion valve in refrigeration?
The expansion valve removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a vapor in the evaporator. The liquid refrigerant leaving the expansion valve is quite cold. The orifice within the valve does not remove heat, but only reduces pressure.
What cycle does a refrigerator work on?
Air refrigeration systems belong to the class of gas cycle refrigeration systems, in which a gas is used as the working fluid. The air refrigeration system works on the Joule cycle or reverse Brayton cycle or Bell-Coleman Cycle.
What is refrigeration control?
Refrigeration System Controls are defined as equipment that controls and optimises the temperatures and pressures in a refrigeration system, and automatically adjusts the refrigeration system’s operation to minimise its energy consumption, while maintaining within predefined temperature limits the spaces, processes or …
What controls a fridge compressor?
In most commercial refrigerators, the thermostat has a capillary tube filled with gas. As the temperature in the fridge increases, the gas expands and pushes on a diaphragm, which operates a set of contacts which in turn operates the compressor.
What is the purpose of back pressure?
Production Vessels that Require Back Pressure In order to perform their function appropriately, these vessels must maintain a constant pressure. This allows fluid or gas to process through the vessel and out for further processing or disposal.
Where is the relief valve in refrigeration system?
Relief valves: Relief valves are fitted in discharge side of compressor and will lift and safeguard the compressor in the event of over pressure. One relief valve is also fitted in the condenser refrigerant line to avoid damage to the condenser if there is high pressure in the discharge line.
On which principle does the refrigerator works * 1 point Daltons Law of pressure principle of thermodynamics cycles conservation of mass none of the above?
Solution(By Examveda Team) Refrigeration works on one of the corollary of second law of thermodynamics namely clausius statement.