Refrigerant Liquid Receiver Sizing

Parker type rt receivers provides a reservoir for refrigerant during operation of a refrigeration system.

Refrigerant liquid receiver sizing.

A 25 000 btuh load will require a 3 8 line for 100 equivalent feet point a. For these systems a 0 040 inch 1 02 mm diam eter orifice is the recommended starting point. 100 would be the required storage volume for the refrigerant and the extra 25 is for the gas space for expansion. The receiver is also often called a liquid receiver and you will see it on everything from small self contained refrigeration units to very large commercial and industrial systems.

The line sizes given on the specification sheets are based on a 5 pound pressure drop for the entire piping run from 50 to 250. The device must also prevent liquid slugging of the compressor and excessive refrigerant dilution of the compressor oil. There are two refrigeration circuits each with a liquid line supplying liquid refrigerant from the condenser to a tx valve adjacent to the evaporator and a suction line returning refrigerant gas from the evaporator to the suction connections of the compressor. Return oil from the evaporator to the compressor at minimum system capacity.

While an accumulator is located in the suction line before the compressor and prevents liquid from entering the. Refrigerant piping design goals a common goal is to size the suction hot gas and liquid lines for about 1fº pressure drop at design capacity. They must return refrigerant and oil to the compressor at a sufficient rate. Prevent oil draining from an active to an inactive evaporator when more than one.

For systems with a. Thought given to any consideration other than receiver size. The only thing i am aware of is the requirement for the receiver to have sufficient volume of at least 125 of the receiver holding capacity. The resulting high discharge low suction pressure condition will result in more liquid refrigerant in the accumulator.

Surprising as it may seem the receiver can often be a source of liquid refrigerant control problems may affect condensing pressure and liquid subcooling and frequently is a storage reservoir for excessive amounts of liquid refrigerant. A suction line must. The oil return orifice size should be small to prevent excess liquid refrigerant being returned to the compressor. Many new techs who are used to residential air conditioning confuse receivers with accumulators.