Refrigerant under what circumstances is negative pressure

refrigerant under what circumstances is negative pressure? Believe that a lot of used refrigerants friend also don't know, it doesn't matter, because this is a question of a scientific attitude and concept. Below small make up for everyone to do the introduction, let's learn together.

should put the refrigerant under what circumstances, Temperature) Is the concept of negative pressure to clear up!

as refrigerant R12, according to its physical and chemical thermodynamic properties, when the temperature in - 31 degrees just is negative pressure ( - 0. 0182 kg/cm2 gage pressure) , under the normal operation of tank temperature will not to - 31 degrees and the following, so R12 system operation pressure is positive pressure.

like R600a refrigerants, according to its physical and chemical thermodynamic properties, when the temperature in - 12 degrees of corresponding pressure is 0 gage pressure, only in - 12 degrees below will enter the negative pressure. In the refrigerator freezer refrigeration temperature normally are - basic 12 degrees below, so that it reflects the operation pressure is displayed in a negative state.

a refrigerant is not in the negative pressure, it is the premise of temperature under corresponding pressure temperature? Refrigerant R12, for example, if the temperature of the in - 31 degrees? If the temperature of refrigerant R600a in - 12 degrees below? Otherwise it must be a positive pressure!

if the temperature of R12 system in - 31 degrees or above, can get a negative pressure? If R600a system of temperature in - More than 12 degrees, can be negative pressure? So can't routinely questioned how a refrigerant pressure is not a negative pressure? Blind pursuit of negative pressure. In filling R600a refrigerants, the pursuit of negative pressure, wrongly, that did not dare to make pressure for positive pressure, the results go detour, wasted time and energy.

the above refrigerant under what circumstances is the introduction of negative pressure over here, hope to bring you some help. Everything is inseparable from science, with scientific attitude to treat everything, use the scientific method to straighten out the problem.

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