Refrigeration

Approximately 30 years ago, several refrigerants emerged as alternatives for chlorine-containing CFCs. Just a few examples of some of these alternatives are R401A, R401B, R402A, R402B, etc. The majority of these refrigerants were in the R400-series category and are also referred to as zeotropic refrigerants...

One of the main challenges with using carbon dioxide as a refrigerant is its low critical point of approximately 87.8°F or 31°C. Historically, when the critical point of a refrigerant is lower than the ambient air, it was dismissed as a viable

By Phil Boudreau Subcooling is simply the process of reducing the temperature of the refrigerant below its saturation temperature. Natural subcooling takes place as the cool ambient temperature or cool fluid temperature enters the condenser and removes additional heat from the already condensed liquid. Mechanical subcooling is a…

In Part I in the November/December 2020 issue (available online at www.mechanicalbusiness.com), the need for oil cooling in screw compressors at higher compression ratios was...