Refrigerant Liquid Receiver Sizing

The role of the receiver in system operation.

Refrigerant liquid receiver sizing. They must return refrigerant and oil to the compressor at a sufficient rate. Liquid line sizing due to the lack of space the specification sheets have just one column for a liquid line size. While an accumulator is located in the suction line before the compressor and prevents liquid from entering the. There is a double suction riser on one of the circuits.

A suction line must. Thought given to any consideration other than receiver size. A 25 000 btuh load will require a 3 8 line for 100 equivalent feet point a. Many new techs who are used to residential air conditioning confuse receivers with accumulators.

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. 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. The device must also prevent liquid slugging of the compressor and excessive refrigerant dilution of the compressor oil. The resulting high discharge low suction pressure condition will result in more liquid refrigerant in the accumulator.

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. Return oil from the evaporator to the compressor at minimum system capacity. Prevent oil draining from an active to an inactive evaporator when more than one. 100 would be the required storage volume for the refrigerant and the extra 25 is for the gas space for expansion.

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. For systems with a. For these systems a 0 040 inch 1 02 mm diam eter orifice is the recommended starting point. The oil return orifice size should be small to prevent excess liquid refrigerant being returned to the compressor.