The objective of this theoretical investigation was to find a capable and economical way of controlling high speed refrigeration compressors with a low number of cylinders. Compressors with 4 cylinders or more allow control by cutting-off one or two cylinder blocks because the remaining blocks maintain a sufficient smoothness of low speed fluctuation. The type of regulation to be found in this ...

This paper deals with a multi-objective optimization of a novel micro solar driven combined power and ejector refrigeration system (CPER). The system combines an organic Rankine cycle (ORC) with an ejector refrigeration cycle to generate electricity and cold capacity simultaneously. Major thermodynamic parameters, namely turbine inlet temperature, turbine inlet pressure, turbine back pressure, ...

Only two classes of compressors were offered at the end of the 1950s in the United States for large air conditioning and refrigeration applications: the positive displacement reciprocating and the dynamic centrifugal machines. Reviewing manufacturers’ catalogs of water chillers showed that the capacity range of the two classes overlapped. The authors of a 1961 paper came to the following conclu...

Adsorption cold storage has lately attracted attention for its large storage capacity and zero cold energy loss during the storing process. Thermodynamic and experimental studies on the cold storage capacity and the cold discharging process, in which the adsorber is either air cooled or adiabatic, have been presented. An adsorption cold storage system with zeolite–water working pair has been de...

The sound radiation characteristics of a semi-hermetic twin-screw compressor were studied while operating under controlled laboratory conditions at the Ray W. Herrick Laboratories of Purdue University. A fully-condensing load stand was designed to allow the 70 ton chiller system to be operated at the three standard loading capacities of the compressor. The load stand was operator controlled and...

• A new hybrid humidification–dehumidification and air conditioning system is proposed and investigated. • The proposed system keeps the function of the air conditioning system and uses it in water desalination. • The effects of system operating parameters on system performance were evaluated and correlated. a b s t r a c t a r t i c l e i n f o An experimental study of the performance of a hyb...

This paper reviews the design of a combination variable I fixed-step port unloader system for moderate capacity refrigeration screw compressors. The general specification of an unloader system to meet application requirements and specific issues of port and flowpath design are discussed. The paper demonstrates use of a comprehensive compressor simulation and a commercial pipe flow analysis prog...