Views: 65 Author: Site Editor Publish Time: 2021-05-11 Origin: Site
The two main advantages of hydrocarbon refrigerants are energy saving and environmental protection; energy saving: air conditioners with hydrocarbon refrigerants save 15% to 35% of energy than those with R134 and R22. Environmentally friendly: Hydrocarbon refrigerants are natural substances, so they do not pollute the atmosphere, do not damage the ozone layer and have almost zero greenhouse effect.
Lubricants: Minerals Alkanes, or saturated group, are chain hydrocarbons with only carbon-carbon single bonds and carbon-hydrogen bonds, and are the simplest class of organic compounds. The alkane molecule has a single bond between the carbon atoms to form a chain (straight chain or containing branched chains), except for the rest of the chemical compounds are all saturated by hydrogen atoms.
The number of hydrogen atoms reaches a maximum in the alkane molecule. The general formula of an alkane is CnH2n+2. Each carbon atom in the molecule is sp3 hybridized. The role of alkanes is mainly to make fuel. Natural gas and biogas (the main component is methane) are widely used as clean energy sources. The various fractions obtained by petroleum fractional distillation are used in various engines. Properties of alkanes
Alkanes undergo regular changes in their physical properties as the number of carbon atoms in the molecule increases.
1. At room temperature, their states range from gaseous, liquid to solid, and they are colorless whether they are gases or liquids. Generally, C1~C4 gaseous state, C5~C16 liquid state, C17 and above solid state.
2. Their melting and boiling points are from low to high. For the same number of carbon atoms, the more branched the chain is, the lower the melting and boiling points are.
3. The densities of alkanes range from small to large, but they are all less than 1g/cm^3, i.e., they are all less than the density of water.
4. All alkanes are insoluble in water, but easily soluble in organic solvents.
HCR433B is flammable, but must simultaneously meet the concentration in the range of flammable concentration and temperature above the ignition point of two conditions to burn, HCR433B flammable concentration for the volume concentration between 2.1-9.5%, the ignition point of 490 ℃. According to experiments, the actual explosion conditions are higher, even in the best detonation concentration of 5.5% to 810 ℃ before the explosion.
The lowest detonation concentration of 2.6%, when the detonation temperature of 918 ℃. As R433b concentration increases, the detonation temperature decreases to 5.5% when the detonation temperature reaches a very small value of 810 ℃, the concentration increases again detonation temperature will increase, when the concentration of 8.5% when the detonation temperature reaches 880 ℃, the concentration of more than 8.9% and less than 2.5% of R433b air mixture does not have flammable explosive, at this time the burning cigarette is not enough to make it explode.
However, the refrigerantis in a closed space for physical transformation, and in the filling before the vacuum has been pumped, simply does not have the conditions of combustion and explosion.
