A benchmark analysis was conducted to predict the maximum steady-state pet$onnance potential of a nearterm moduikting residential-size heat pump. Continuousiy variable-speed, permane nt-magnet electronically commutated motors (ECMs) were assumed to modulate the compressor and the indoor and outdoor fans in conjunction with existing modulating reciprocating compressor technology A modulating hea...

The moving endwall has a great influence on the development and stability of axial compressor leakage flow. This paper presents novel experimental facility with high-speed for studying uniqueness design concept is that using large disk simulates endwall. When R/Cx = 16, theoretical analysis shows maximum linear velocity difference about 2.5% while mid-three passages less than 5%. Single-passage...

This research presents techniques developed for non-intrusive sensing and fault detection in reciprocating compressors driven by induction motors. These procedures are “non-intrusive” because they rely only on voltage and current signals measured on the compressor power cable. The electrical sensor based method allows for easy and non-intrusive determination of many fault sensitive signals that...

The rotor of a magnetic suspension centrifugal compressor is supported by bearing, and power failure will cause the high-speed to fall directly onto protective bearings, affecting reliability compressor. To solve this problem, paper proposes an abnormal shutdown control method with semi-switching modulation inverter. Firstly, overall scheme designed, its feasibility analysed in detail through m...

An experimental investigation of the effects of stage matching on compressor surge-by-This paper summarises some exploratory tests on o low speed low pressure ratio multi-stage a;:ial compressor, in rJhich mism2Ltchi.q w&s simulated by appropriate staggering of the stages, the last ztrgo alone being unchanged. Overall and stage characteristics anil surge flow coefficients were determined for tw...

This study compares the performance characteristics of a household refrigerator equipped with an Electronic Expansion Valve (EEV) with those with a capillary tube. A 513-liter top-mount refrigerator, originally equipped with a capillary tube, was retrofitted with a Pulse Width Modulated (PWM) expansion valve and extensively tested. Comparative analyses were performed based on standardized pull-...