John Tomczyk is HVACR professor emeritus, Ferris State University, Big Rapids, Michigan, and coauthor of Refrigeration & Air Conditioning Technology, published by Cengage Learning. Contact him at email@example.com.
Filter driers are designed to remove foreign materials, such as moisture, dirt, sandpaper grit, soldering flux, small solder beads, and acid from a refrigeration or air conditioning system. However, filter driers are notorious for becoming restricted from moisture, sludge, dirt, or oil that has entered the system from a poor service practice or extreme operating conditions.
A company has invented and patented a method for freezing edible alcohol products. The consistency of the products ranges from hard and solid through sorbet-like, and all stay frozen in the temperature range of 24°-28° without affecting taste, consistency, or alcohol content.
One method of head-pressure control during low ambient conditions is to use a mechanical hold-back or flooding valve located at the outlet of the condenser to hold back or flood liquid refrigerant in the condenser. This valve is often referred to as an open on rise of inlet (ORI) valve because it will start to throttle open on a rise in condenser pressure.
Homes, restaurants, bars, and businesses rely on clear, clean ice for many applications. Ice is considered a food source, and the water that makes the ice must be of good quality. Good quality water will produce a crystal-clear, hard piece of ice.
Although today’s portable evaporative coolers will reduce the temperature in almost any environment, for optimum performance, the temperature should be 85° or higher, and the relative humidity should be below 75 percent.
Hydrofluorocarbon (HFC)-134a replaced chlorofluorocarbon (CFC)-12. Now, 134a is on its way out, too. The July 2, 2015, ruling from the U.S. Environmental Protection Agency (EPA) set forth the time frames for the phasedown of certain HFC refrigerants in specific applications.
One of the main components of any refrigeration or air conditioning system is the condenser. As its name indicates, the condenser condenses refrigerant vapor sent to it from the compressor. However, the condenser also performs other important functions, too.
An undercharge of refrigerant will cause low head and suction pressures, but that is not the only thing that will cause both pressures to be low. An undercharge will have low condenser liquid subcooling readings on the high side, where a dirty air filter for the evaporator will not produce low condenser liquid subcooling readings.