The invention discloses a compressor. The compressor includes a first primary cylinder (1), a second primary cylinder (2) and a secondary cylinder (3), which are stacked, a separator is provided between two adjacent cylinders. The first primary cylinder (1) is provided with a first air entry, the second primary cylinder (2) is provided with a second air entry, and the secondary cylinder (3) is provided with an air outlet. The first primary cylinder (1) and the second primary cylinder (2) are connected in parallel, and the first primary cylinder (1) and the second primary cylinder (2) are connected in serial to the secondary cylinder (3) after being connected in parallel. A refrigerant entering the first air entry and the second air entry is discharged from the air outlet after primary or/and secondary compression. The two separators are divided into a first separator and a second separator. Any one or two of the first separator, the second separator and a lower flange may be provided with a slide piece control device. An air conditioner having the compressor is provided. The compressor may operate in multiple modes, and different modes are selected according to different application occasions, thus improving the heating capability, and improving the capabilities of a rated point and an intermediate point.

Compressor and air-conditioner

A refrigerant compressor for use in a chiller-heater system that can provide chilled water at less than 10°C and hot water at more than 80°C without the need for additional heat input, the compressor being configured to provide a compression ratio of at least 18: 1 and a temperature lift across the compressor of at least 80K, and the refrigerant fluid being selected to give the desired temperature lift without the pressure at the compressor outlet exceeding 25 bar.

Centrifugal refrigerant vapour compressors

An apparatus and method for cooling a compressor motor (152) having a motor stator (162) and rotor (166) in a refrigerant system (100). The method cools the rotor and the stator, electromagnetic bearings (160) located within a compressor housing providing refrigerant liquid to the stator internal channels, the channels being in fluid communication with a rotor passageway (172), and a flow-control device (168) controlling refrigerant flow into the stator. A temperature monitoring device (176) in communication with a controller (140) monitors motor temperature. The controller (140) evaluates the motor temperature and adjusts refrigerant flow through the flow control device (168), maintaining the motor (152) within a predetermined temperature range.

Hermetic motor cooling and control

A centrifugal compressor with three different shrouded 2D impellers is studied numerically. All impellers have the same dimensions, and they only differ in channel length and geometry. Noticeable differences in efficiency are observed. Two different turbulence models, Chien's k- and k- SST, are compared. For this case, k- SST was found more realistic. The hypothesis that pressure losses in a curved duct and in an impeller passage behave similarly is suggested and found inadequate.

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Effects of Different Blade Angle Distributions on Centrifugal Compressor Performance

A heating, ventilation, air conditioning and refrigeration (HVAC&R) system having a compressor, a heat exchanger, an expansion valve, and a multichannel heat exchanger connected in a closed refrigerant loop. The multichannel heat exchanger has at least two fluid flow paths cooled by a flow of air from an air-moving device through the multichannel heat exchanger. Each of the at least two fluid flow paths have an inlet and an outlet in communication there between. The multichannel heat exchanger also has at least one flow regulator disposed in at least one outlet to regulate through at least one fluid flow path in response to the air flow through the heat exchanger to achieve a substantially equal temperature of a fluid flowing in the at least two flow paths.

Multichannel heat exchanger

A cooling system (10) is provided for a motor (50) powering a compressor (32) in a vapor compression system (14). The cooling system (10) including a housing (114) and a cavity (126) within the housing (114). A first fluid circuit (140) has a first connection (112) to receive a refrigerant into the cavity (126), and a second connection (154) to deliver refrigerant from the cavity (126) to a heat exchanger for a heat transfer relationship with a heat-generating component (120).

Motor cooling applications

An economized refrigeration system includes a main refrigerant circuit having a condenser, an evaporator, an economizer, an expansion device intermediate the condenser and the economizer, and a main compressor fluidly connected by a main refrigerant line. The system also includes an economized refrigerant circuit including an auxiliary compressor system and an auxiliary refrigerant line fluidly connecting the economizer to the auxiliary compressor system and fluidly connecting the main refrigerant line to the auxiliary compressor at a location intermediate the main compressor system and the condenser. The auxiliary compressor system is independently controllable with respect to the main compressor system.

Economized refrigeration system

A method for cooling a compressor motor (170) and a cooling circuit utilizing refrigerant that originates in the condenser (30) to cool a motor (170) and electromagnetic bearings (196, 206). The motor drives a compressor (20), while the electromagnetic bearings support the motor rotor (178) during operation of the compressor. Liquid refrigerant from the condenser is expanded into a two-phase mixture, passed over the stator, expanded a second time, passed over the bearings and between the stator and rotor, before being returned to an evaporator (50).

Motor cooling method for a compressor

A motor coolant method and system is used to cool a compressor motor (36) in a refrigeration system having a multi-stage compressor (38). The compressor includes a first compressor stage (42) and a second compressor stage (44), the first compressor stage providing compressed refrigerant to an input of the second compressor stage. The motor coolant system has a first connection with the refrigerant loop to receive refrigerant into the motor cavity for cooling, the received refrigerant provided from a system component having a high pressure, and a second connection with the refrigerant loop to return refrigerant to an intermediate pressure greater than an evaporator operating pressure. The pressure inside the motor cavity may be approximately the pressure within the first stage discharge and second stage suction to minimized seal leakage between the motor cavity and the internal pressures of the first and second stage compressors.

Method and system for rotor cooling

It is a known fact that machined impellers result in improved compressor performance compared to cast impellers of the same design. The performance improvements can be attributed to better surface finish, more accurate geometric definition (tighter dimensional tolerances), well-defined edges, and the lack of blade tip fillet on shrouded impellers. In addition, it has been observed through experimental investigations that the construction method of the impellers has an impact on performance.
This paper presents computational fluid dynamic investigations of two types of impellers, with blade surfaces generated using straight-line elements (SLEs) and CAD arbitrary definitions. Because there are many different mathematical definitions that CAD tools employ for curves, the resulting arbitrary blade surface is not unique. The numerical results will help understand the causes of the performance differences as well as the effects of SLE blades on the flow through the impeller. Input conditions for computational dynamic simulations are based on experimental results. All references to experimental data in the present paper are for cast impellers. Therefore, the differences in performance are attributed to blade definition (SLE versus other) and not to differences resulting from manufacturing methods.

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Steven T. Sommer

Papers

Motor cooling applications

Economized refrigeration system

Motor cooling method for a compressor

Method and system for rotor cooling

Numerical Analysis of Blade Geometry Generation Techniques for Centrifugal Compressors