This paper describes some of the challenges experienced in the application of a carbon dioxide reciprocating piston compressor to a water heating heat pump. Due to the characteristics of CO2 in a trans-critical cycle, including high pressures, high discharge temperatures, and high solubility in oil, particular difficulties may be experienced such as reduced bearing reliability caused by bearing...

Reciprocating compressors are most common type of compressor and most flexible machine to handle wide capacity and condition swings. They offer a most efficient method of gas compressing. They are vital machines in various units of industrial plants. In this paper advanced technologies and latest configurations and methods regarding condition monitoring, performance, flow management, capacity c...

A numerical method is presented for computing the time varying stresses in reciprocating compressor discharge tubes during starting. The tube is described using shell elements, and mounting springs are described using beam elements. Mass and stiffness matrices are assembled into a second order system of equations that is then solved in a time step fashion along with mechanism and induction moto...

The paper describes design and optimisation of a tubular moving-iron linear permanent magnet motor for reciprocating compressor using finite element. The four leading design parameters are optimised individually. To validate the process reaches an optimal design, two leading parameters are varied simultaneously. This is due to one parameter may influence other parameters. The linear motor is ai...

A numerical simulation of the thermal and fluid-dynamic behaviour of hermetic reciprocating compressors has been developed by solving the one-dimensional and transient governing equations of the flow (continuity, momentum and energy) in the whole compressor domain. The governing equations are discretized using an implicit control-volume formulation. A SIMPLE-like algorithm, extended to compress...

The adjustment and control mode of frequency conversion for an air-conditioner can make the refrigeration capacity adapt the variety of its load very well. Thus, it has many advantages such as low variety in in-door temperature, short time to reach the wished temperature, low energy consumption, low start electric current and low strike to electric source etc. This mode is widely used in room a...

The development of more efficient hermetic compressors for refrigeration involves a sound analysis of the heat exchanges inside the machine to evaluate the interaction among compressor structure, flow characteristics, refrigerant properties and operative conditions. This work presents a computational procedure for the steady-state thermal analysis of a hermetic reciprocating compressor. The mac...

A typical reciprocating co~pressor consists of a motor, a pump, suction discharge system and a lubrication system. An integrated computer simulation model incorporating all these components simultaneously was developed to predict, evaluate and optimize the overall performance and reliability. For the given design variants of a compressor, the computer program first calculates the mass flow rate...

A system is described in which a digital computer was used to control the acquisition, storage, processing and display of experimental data from a reciprocating compressor plant. Analog signals were conditioned, passed to an analog-digital converter and transferred to a mini-computer with direct memory access. The maximum processing rate of the analog-digital converter was 100, 000 readings per...