Keep cooling output, electrical input and displacement separate
Cooling capacity describes the refrigeration effect at stated conditions. Motor rating and absorbed electrical power describe different quantities. Displacement describes a swept-volume quantity; it is neither delivered compressed-air flow nor a cooling-capacity rating.
For example, the Hanbell RC2 family includes a published maximum displacement of 1,527 m³/h at 50 Hz. That is a family endpoint, not the rating of every RC2 configuration. Hanbell also identifies alternative motor configurations. Request the complete model and a selection result at the refrigerant and temperatures your system will use.
Write the refrigerant duty precisely
Name the refrigerant and required cooling capacity. State evaporating and condensing temperatures, the temperature convention used for a blend, suction superheat, liquid subcooling and whether an economizer is included. Identify normal and limiting operating cases. Ask the manufacturer to return its selection and permitted operating envelope, including the relevant cooling and protection requirements.
Do not treat a family's list of refrigerants as blanket approval for every model, motor or application. Confirm the exact offered configuration and its documentation. An existing system also needs its oil, connections, controls and protection arrangement checked before a replacement is accepted.
Existing screw-refrigeration product routes
| Manufacturer profile | Existing product route | Information to resolve |
|---|---|---|
| Hanbell, Shanghai | RC2 semi-hermetic screw | Full model and motor option; refrigerant-specific selection |
| BITZER, Beijing profile | CSH / CSW screw families | Offered variant, operating envelope and origin |
| McQuay, Suzhou profile | Semi-hermetic single-screw selection | Actual compressor selection and package boundary |
These links identify product families for further review. They do not establish interchangeability, stock or the production origin of every model. A refrigeration directory can also contain piston and scroll equipment; those architectures should not be presented as screw-compressor matches.
Define the package and handover
Say whether you need a compressor, a unit with auxiliaries or a complete refrigeration package. List the existing or required oil system, controls, sensors, electrical supply, heat exchangers and installation interfaces. Request the current dimensional drawing, connection details, selected-duty performance and protection requirements.
For replacement work, provide the original nameplate and system operating information rather than requesting only an equivalent horsepower. Agree selection approval, commissioning responsibility, documentation and the scope of any applicable model or destination approvals. A corporate certificate does not establish the suitability of the complete installation.
Send a refrigeration-screw enquiry. Keep cooling output and electrical input in separate fields so manufacturers can return comparable selections.