Technical Note


Development of Scroll Compressor Technologies

— Continued from August Issue Reported by Kenji Tojo, Tojo R&D Office Compliance Mechanism For higher scroll compressor efficiency, airtightness must be maintained by curbing leakage ...


The 13th International Symposium on New Refrigerants and Env

Japan Refrigeration and Air Conditioning Industry Association (JRAIA) will host the 13th International Symposium on New Refrigerants and Environmental Technology at the International Conference Center...


Future Prospects of Smart Air Conditioners

A smart air conditioner is one of the so-called smart home electric appliances that can be remotely operated and monitored thanks to the incorporation a set of advanced communication functions and by ...


Development of Scroll Compressor Technologies

Reported by Kenji Tojo, Tojo R&D Office History   The concept of transferring a fluid by combining a pair of same -shaped scroll wraps is said to have existed for a long time. During the...


Arkema Contributing to Transition to Low-GWP Solutions Follo

Contributed by Allen Karpman, director, Government Affairs, Arkema, Fluorochemicals – Americas For the past 40 years, most of the industrial and consumer uses of fluorinated gases have been c...


Opteon Series Low-GWP HFO Refrigerants

Opteon XL41 is a replacement for R410A in new equipment. XL41 provides the lowest GWP available (466) of all near-drop-in solutions with a reduction of 78% compared to R410A. In addition to that, it is a very close match to R410A and in some cases even provides superior performances with respect to capacity and efficiency. Classified as mildly flammable (A2L), Opteon XL41 al-lows much higher charg...


Alternative Refrigerant Issues Update

Overview: Kigali Amendment At the 28th Meeting of the Parties to the Montreal Protocol (MOP 28), held in October 2016 in Kigali, Rwanda, the parties agreed to add an amendment to the Montreal Protoco...


Screw & Centrifugal Compressors

– Continued from June Issue Efficiency Improvement of Centrifugal Compressors at Offdesign Conditions Ever since the Air Conditioning, Heating, and Refrigeration Institute (AHRI) introduced ...


Very Successful ACRA2018 Staged in Sapporo

The nineth Asian Conference on Refrigeration and Air conditioning (ACRA2018) was held in Sapporo, Japan, on June 10–13, 2018. Seamlessly organized by Japan Society of Refrigerating and Air Condi...

U.S. VRF Report