Centrifugal compressor9/28/2023 The refrigerant used With centrifugal compressors should have high specific volume.As centrifugal compressors work for systems ranging from 50 to 5000 TOR, these compressors are impractical for systems having capacity below 50 TOR.The pressure increase per stage is considerably less as compared to reciprocating compressors.Surging is the reversal of flow of refrigerant from compressor to the evaporator, when the refrigeration load decreases below 35% of rated capacity. Surging: The main disadvantage in centrifugal compressor is surging, which causes severe stress conditions in it.and above), therefore, they can be directly coupled with electric motors or steam turbines.ĭisadvantages of Centrifugal Compressors Over Reciprocating Compressors Ability to run at high speeds: They run at high speeds (5000 r.p,m.Less floor space required: Centrifugal compressors occupy less floor space as compared to reciprocating compressor for same capacity.Suitable for high capacity systems: Centrifugal compressors are used for 50 to 5,000 TOR capacity system.Due to high speed, these compressors can handle large volume of vapour refrigerant as compared to reciprocating compressors. Ability to handle large volume of vapour refrigerant: Centrifugal compressors are high speed machines.Low maintenance cost and easy lubrication: Due to absence of reciprocating parts, lubrication is simple and maintenance cost is less.More life: The working life of centrifugal compressor is more as compared to reciprocating compressor, due to absence of moving parts such as valves, connecting rod etc.The centrifugal compressor is generally used for refrigerants, which require large displacement and low condensing pressure, such as R-11 and R-113.Īdvantages of Centrifugal Compressors over Reciprocating Compressors The volute casing collects the refrigerant from the diffuser and it further converts remaining kinetic energy of refrigerant into pressure energy, so that, refrigerant can be discharged to condenser. The diffuser is normally a vane less pipe, as it permits more efficient part load operation, which is quite usual in any air conditioning plant. The kinetic energy thus attained at the impeller outlet is converted into pressure energy, when the high velocity vapour refrigerant passes over the diffuser. ![]() ![]() The high speed of the impeller leaves the vapour refrigerant with high velocity at the vane tips of the impeller. When the impel er rotates, it pushes the vapour refrigerant from the centre of the impeller to its periphery by centrifugal force. 1 The impeller rotates in an air-tight volute casing with inlet and out et points and draws in low pressure vapour refrigerant from the evaporator. Construction and Working of Centrifugal CompressorĪ single stage centrifugal compressor consists of an impeller, to which, a number of curved vanes are fitted symmetrically, as shown in Fig.
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