Propane, a hydrocarbon refrigerant, Molecular Formula C3H8, appearance colorless gas, pure odorless, slightly soluble in water, soluble in ether, ethanol, flashpoint °c-104. The upper explosion limit is% v / V 9.5, the lower explosion limit is% v / V 2.1, the relative density of air is 11.56, the heat of combustion is KJ / Mol: 2217.8, the ignition temperature is 450 ~ 470 °C. Note: Flash Point: the temperature at which a mixture of steam and air on the surface of a flammable liquid first occurs in contact with fire. Health Hazards: SIMPLE ASPHYXIA and anesthesia. Short-term exposure to 1% propane does not cause symptoms; concentrations below 10% cause only mild dizziness; high concentrations of exposure can lead to anesthesia, loss of consciousness; extremely high concentrations can lead to suffocation. Hazard characteristics: Flammable Gas, mixed with air can form explosive mixture, heat source and open fire with the risk of combustion and explosion, Safety Class A 3. Small charge: R290 refrigerant dosage is only R22, R410A of 40% ~ 55% , less dosage, more economic. Energy Saving: Low freezing point, higher latent heat of evaporation, faster cooling rate per unit time; less isentropic compression than work, easier compressor work, longer compressor life; small molecular weight, good fluidity, lower conveying pressure, reduced the load of the compressor. Using R290 refrigerant, the energy saving rate can reach 15 ~ 30% .

Article Collation from the "encyclopedia of refrigeration"
cold and warm life, Binger accompanied !