Cross flow heat exchanger evaporator - Heat exchanger optimal circuty

Technical information Evaporators Crossflow Evaporators With Headers

Crossflow Evaporators With Headers

Another design strategy used to reduce the pressure drop across the evaporator is to split the coil into a number of separate contours of equal length. This project requires that provisions be made simultaneously feed each circuit widi refrigerant, collect die die pair at the end of each chain and deliver it to the suction pipe. The simplest mediod simultaneously filing and collection of refrigerant for each path through the use of pipe headers. Title or collector is a trumpet, which consists of several smaller pipe connections are terminated on his part.

When the refrigerant flow through the circuits in the evaporator, situated perpendicular to the direction of the air flow, the process is called cross-heat exchange. In this design, the difference between the temperature of the air flowing through the heat exchanger's fins and tubes of the refrigerant in a much greater die chain closer to the incoming air stream than for other circuits. Consequendy, the first circuit faced by die airflow is more heavily loaded and requires more refrigerant than in the past, the circuit in which the air is cooled and leaving the coil.

Because die crossflow evaporator, the refrigerant is supplied from one meter, it is impossible to satisfy various load circuit on the evaporator.

When one is balanced, odiers lack or overfed refrigerant. This illustrates one of the disadvantages of using headers in cross-heat exchanger applications: They are not capable of balancing the flow of refrigerant die in separate circuits based on their circuit load. Consequently, the operating efficiency of cross-heat exchanger is always less than optimal. This reduces the efficiency of heat exchange processes and C.O.P. system.

Manifolds simple design also introduces another disadvantage of using the headings in the cross-heat exchanger applications: liquid part of the liquid-vapor mixture inlet manifold from the metering device is not equally distributed to each of the circuits. Therefore, some schemes to gain a bigger share than the other pair. This answer compounding problems of widi unbalanced circuit loading. The higher the downloaded circuits to produce more steam, limiting die flow of liquid refrigerant from the manifold. Hence, easier downloaded contours be more fluid and schemes that should the liquid refrigerant is lacking, and those that should not die refrigerant overfed.

Based on these operating characteristics, crossflow circuit coils with headers are used only with flooded or circulates refrigerant (overfeed) evaporating installations. In these designs, liquid refrigerant fills all the evaporator circuits. Steam is drawn off the refrigerant battery tank located on the suction end of the evaporator. This operation is different from the dry systems, where the refrigerant evaporates and superheated die before leaving the evaporator.

Countercurrent Evaporators With Headers

When circuits in the evaporator oriented parallel to the direction of the air flow, the arrangement is called a countercurrent heat exchange. Countercurrent structures equalize die thermal load for each circuit, because each chain are subjected to the same temperature as the air moves through the heat exchanger. In addition to the changed orientation chains, counterflow heat exchanger is configured so that the transmission fluid energy as they flow past each other in opposite directions. Therefore, the warm part of both liquid exchange diermal energy with each other, how to make them cool portions. This strategy supports the greatest means the temperature difference between the air and refrigerant. Both of these characteristics increase the amount of thermal energy diat refrigerant passes, improvement die efficiency of the heat transfer process. In this circuit, design, collectors can be used, although they are not the best way to deliver the refrigerant circuits, because diey still cannot provide the same amount of liquid and steam is delivered to each circuit...
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