A two-stage cascade system employs two vapor-compression units working separately with different refrigerants, and interconnected in such a way that the evaporator of one system…
Tag: Refrigerating System
Basically, there are two ways to purge a system of air: manual or automatic. To purge manually, a properly positioned valve is opened by hand,…
One of the most common applications of refrigeration systems is to produce and maintain space temperatures by circulating air through a refrigerated coil. If the…
Superheating (referring to superheating of the refrigerant vapor leaving evaporator) and subcooling (referring to subcooling of refrigerant liquid leaving the condenser) are apparently two significant…
A defrost controller with timer (Figure 3.27) operates various control valves and fan relays to quickly and efficiently remove frost and ice accumulation from evaporator…
Some of the refrigeration units have enough space within the condenser to accommodate the entire refrigerant charge of the system. If the condenser does not…
It is well known that compressors are designed to compress vapors, not liquids. Many refrigeration systems are subject to the return of excessive quantities of…
The thermostatic expansion valves are essentially reducing valves between the highpressure side and the low-pressure side of the system. These valves, which are the most…
In practice, throttling devices, called either expansion valves or throttling valves, are used to reduce the refrigerant condensing pressure (high pressure) to the evaporating pressure…
These coolers are generally called direct expansion coils and consist of a series of tubes through which refrigerant flows (Figure 3.21). The tubes, which are…