The refrigerant circulates evaporators include liquid coolant circulation pump for the liquid refrigerant through die evaporator circuits. The pump sucks in the liquid refrigerant from the bottom of the battery or separator. This component serves as the container for the refrigerant entering from the metering device and that after returning from the evaporator. Please note that float control supports the level of the refrigerant in the battery at a given point, which leaves space above the liquid to the separation of the couple. The level of the refrigerant in the battery never permitted to drop to a level that allows the refrigerant liquid in the pump or flash cavitate.
The refrigerant mass flow through the pump circulates the refrigerant coil 2-6 times more than the refrigerant flow in dry-expansion coil, with the same load circuit. Thus, 2-6 times more liquid refrigerant circulating than evaporates due to the heat load of the process. High flow velocity of the liquid contains most of the evaporator tubes inside the wet surface.
This increases the intensity of heat transfer over the dry expansion evaporator. In the composition of the refrigerant in the return pipeline battery is composed of 50 to 83% (one-half to five-sixths) liquid for each unit mass distribution. Because of this characteristic, the refrigerant circulates evaporators also known as liquid overfeed evaporators.
Optimal speed for better circulation evaporator performance varies depending on several factors. In order to implement the nominal capacity, it is important that the evaporator manufacturers recommendations you should follow as closely as possible. The refrigerant circulates evaporators are often used in multiple-coil systems. Balancing multiple evaporator system can be difficult, but it gets easier as the speed of the refrigerant in a six-fold increase towards the load circuit. Thus, the circulation rates are usually higher for multi-evaporator systems, than for a single evaporator applications. And in dry expansion evaporator applications of fluid flow in the refrigerant circulates evaporators is controlled by a measuring device. In these applications, the metering device, usually a manual valve expansion or variable orifice device designed for the maximum flow rate required during peak load operation.
By-pass relief valve installed on the discharge side of liquid refrigerant pump. This safety device sends excess fluid back into the battery when one or more evaporators in the small load or off. This strategy prevents excessive circulating prices in active evaporators. Because incompressible fluid, alternate location bypass valve in the refrigerant circuit, fart nest of the pump.
Vapour generated in the action boiling refrigerant in the evaporator circuits are separated from the liquid to die at the top of the battery. From there drawn into the suction line along with the volume of the flashed steam (flash gas)produced as a refrigerant drops from his pressure condensing pressure in the evaporator. This design prevents any erupted from the hit of the refrigerant in the evaporator chains, improving its efficiency...
Evaporators