It is a variable-restriction type expansion valve It maintains constant pressure in the evaporator, the so-called constant pressure expansion valve. A screen or strainer is usually installed at the liquid inlet of the valve in order to prevent the entrance of foreign materials, which may cause the stoppage of the valve. Its main actuating fore …
Magnetic refrigeration was the first method developed for cooling below 2K. It is a low-temperature cooling technology based on the magnetocaloric effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magnetocaloric effect (MCE) is an intrinsic …
The famous dutch Philips research laboratory developed experimental Stirling engines for a wide variety of applications and continued to work in the field until the late 1970s, but only achieved commercial success with the reversed Stirling engine. Philips constructed a refrigerator based on the Stirling cycle, which came to know as the Philips refrigerator. The …
Cryogenics is the branches of physics and engineering that involve the study of very low temperatures, how to produce them, and how materials behave at those temperatures Cryogenic refrigeration is a term that may be applied to the process of cooling to temperatures below 150 K. Cryogenic refrigeration systems are different from conventional refrigeration systems. …
Solar energy can be converted more efficiently to heat than mechanical or electrical energy, the use of vapor absorption cycle with solar energy to be the best solution at present time. It consists of the following collector: Solar flat plate collector Generator Absorber with absorber pump Condenser Evaporator Expansion valve Pressure reducing valve Rectifier Regenerator …
What is the working principle of an absorption refrigeration system? Read More »
By adding a third fluid, an inert gas to the absorption system to balance the low – and high – side pressures of the system to function without a pump. Such system is called as three – absorption system. Thase systems have found widespread use in domestic refrigerators, particularly for mobile homes and recreational vehicles. …
What is an Electrolux refrigerator or Domestic absorption system Read More »
The principal difference in the absorption and vapor compression system is the motivating force that circulates the refrigerant through the system and provides the necessary pressure differential between the evaporation and condensation processes. The vapor absorption refrigeration system uses heat energy as the motivating force, instead of mechanical energy as in the vapor compression refrigeration …
The evaporative pressure or suction pressure is an important factor that affects the performance of a vapor compression system. Let the suction pressure be reduced from P1 toP1‘ on the P-h diagram. Its effect will be. Decrease in refrigerating effect from (h1-h4) to (h1‘-h4) Increase in the specific volume of vapour from v1 to v1‘. …
Flash chamber Flash chamber is an insulated tank. It is always fitted after the metering or throttling device but before the evaporator in a vapour compression refrigeration system. Need of flash chamber: It has been observed that the liquid refrigerant coming out from the expansion device contains some vapour refrigerant also. (normally vapour liquid mixture). …
Under cooling of the liquid refrigerant in the condenser is a normal practice, which ensures that the refrigerant will enter the expansion valve only in a liquid state. In actual practice, the high pressure and high-temperature vapor refrigerant from the compressor are cooled and liquefied when it passes through the condenser. The liquid refrigerant also …
