Refrigeration process can be classified as reasonable or latent cooling, depending on the effect that the heat transfer in the cooling agent. When absorption of thermal energy increases the temperature of the refrigerant, it is a reasonable process cooling. Similarly, when the thermal energy produces a phase change cooling agent (melting and evaporation)is the hidden process cooling. If the refrigerating effect should be continuous temperature of cooling agent must be maintained below to die right place temperature setpoint. This temperature difference is the driving force in the process of heat transfer. To illustrate, 1 pounds (2.2 kg) of water at 32F (0C) is open in the hermetic container Cabinet with an initial temperature of 70F (21.1C).
During the heat transfer from 70F (21. PC) Cabinet in 32F (0C) water. As a result of the kinetic energy of the exchange, temperature die Cabinet will decrease as the temperature of water increases. For every Btu (1055 J) heat diat die water absorbs die from the Cabinet of air, water temperature increases by 1F (0.56C), while the temperature is reduced by 0.24 Btu (253 J).
Over time, the outlet port and stopping the flow of the refrigerant in the evaporator. The evaporation of resumes, the fluid level drops, allowing the valve to open and admit the liquid in the evaporator. This type of metering device is not often used in residential Ana trade equipment due to its physical size and volume of the liquid refrigerant required in the evaporator for the mechanism to work correctly.
Thermostatic valve (TXV) metering devices, which also include needle and saddle to regulate the flow of refrigerant into the evaporator. Rather than measure the height of the pool of liquid refrigerant in the evaporator, TXV measures the temperature of steam at the inlet of the evaporator. It regulates the flow of the refrigerant in the evaporator to maintain a constant leaving the steam temperature. If the rate of evaporation decreases, leaving the steam temperature is reduced, because there is no longer sufficient heat available in space for a steam heat. In TXV reacts to decrease the temperature of steam reduction of refrigerant flow into the evaporator. Similarly, when die speed of evaporation of the coolant die in the evaporator increases, the temperature of the steam increases. In TXV answers that allows more of the refrigerant in the evaporator to maintain a constant suction temperature of steam.
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