CO2 as a refrigerant in cascade supermarket systems, transcritical applications, transport refrigeration, and heat pumps were among major developments in recent years. Here is a summary of those developments.
It appears as if the spigot of new R-22 available to HVACR contractors has been tightened even more in 2013. Users of the world’s most popular HCFC could expect close to 30 percent less of new R-22 this year than last, according to some reports.
The Copeland Scroll™ FFAP Series condensing unit utilizes the Copeland Scroll ZSKA refrigeration compressor (1.5 to 5 hp) and is compatible with a variety of refrigerants, including R-404A, R-134a, R-407C, and R-22. It also has a wide operating range (from -30° to 45°F) of evaporator temperatures.
Designed to control refrigeration units, the KE2 Temp + Defrost saves time on installation by eliminating the need for both a time clock and defrost thermostat, the company said, requiring only wires to connect power, solenoid, and temperature sensor.
An enhanced monitoring and controls system allows restaurants to actively manage their refrigeration using a web-based solution. The Remote Refrigeration Control (RRC) provides real-time reports and alerts, which empowers users to manage the integrity of their food supply from any location.
The European Commission (EC), the executive body of the 25 member countries of the European Union (EU) responsible for proposing legislation, is continuing its efforts to phase down — and in some applications phase out — use of HFC refrigerants in much of Europe.
The refrigerator is actually a heat pump, as the method of operation is identical apart from one difference: Heat is extracted from the refrigerator and discharged into the surroundings, whereas the heat pump uses the thermal energy in the surroundings for heating purposes.
The purpose of this article is to not only demonstrate the proper use of the pressure-temperature relationship, but to also illustrate how service technicians can use the P-T chart to thoroughly analyze a refrigeration or air conditioning system.
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