How does CO2 work as a refrigerant?
How does CO2 work as a refrigerant?
The fluid (CO2) is first boiled and expanded into a superheated vapor by an evaporator. Then, a compressor is used to increase the heat and pressure of the superheated vapor. Once that pressure exceeds the critical point of CO2 (1055 PSIG/74 BAR), the CO2 is transformed into what’s described as an undefined gas.
Can CO2 be used as a refrigerant?
From an environmental perspective, CO2 is a very attractive refrigerant with zero ODP and a GWP of 1. It is a naturally occurring substance and abundant in the atmosphere. CO2 is a high-pressure refrigerant where high operating pressures are required for efficient operation.
What is CO2 refrigerant number?
R744
This is post number 3 of a series. Carbon dioxide is a naturally occurring substance; the atmosphere is comprised of approximately 0.04 percent CO2 (370 ppm). It is produced during respiration by most living organisms and is absorbed by plants.
Is Freon 12 a refrigerant?
Dichlorodifluoromethane is a colorless gas usually sold under the brand name Freon-12, used as a refrigerant and aerosol spray propellant.
What pressures does CO2 run at?
As with other pure substances, CO2 has a direct pressure/temperature relationship in saturated condition (mixture of liquid and gas). At typical low temperature suction temperatures, CO2 operates around 180 psig. At medium temperature suction temperatures, the pressure is around 400 psig.
Can I replace R744 with R134a?
Installation: NOTE: The R744 (CO2) Refrigeration System must be replaced with an R134a Refrigeration System as part of this procedure.
Can CO2 be used as a coolant?
The most important property of carbon dioxide as a coolant is that, when expanded to the atmosphere, a portion of the liquid becomes gas, while the consequent cooling, due to the absorption of the latent heat of vaporization, converts a further portion of the liquid to solid CO2 in the form of ‘snow’.
What is the phase diagram of CO2?
The Phase Diagram of Carbon Dioxide 3) has a more typical melting curve, sloping up and to the right. The triple point is −56.6°C and 5.11 atm, which means that liquid CO2 cannot exist at pressures lower than 5.11 atm.
What is R12 made of?
The chemical name of refrigerant R12 is dichlorodifluoromethane and its chemical formula is CCl2F2. The molecular weight of R12 is 120.9 and its boiling point is -21.6 degree F. Since R12 has the molecules of chlorine and fluorine, it is called as chlorofluorocarbon (CFC).
