Refigeration gauges

Re: Refigeration gauges

The temperature that the back [gauge] pressure relates to is the temperature that the refrigerant is boiling off at in the evaporator. If I understand your question correctly you can’t get the fridge to run at a different cabinet temperature by altering the quantity of the refrigerant charge. if the cabinet’s got a rating plate giving you the weight of refrigerant required the easiest way to charge the system is to go off that.,either by weighing or using the scale on a charging cylinder. If there’s no weight given, charge by watching for icing back down the suction line and then gradually let it out till the icing back disappears.

Re: Refigeration gauges

fraid the old way of doing it, is illegal now…..

However way we all do it, we all are subject to Boyles Law, thats what governs the refrigeration process, understand Boyles Law and understand how it works.

Extracted from the internet

Dr. Schambaugh, of the University of Oklahoma School of Chemical Engineering, Final Exam question for May of 1997. Dr. Schambaugh is known for asking questions such as, “why do airplanes fly?” on his final exams. His one and only final exam question in May 1997 for his Momentum, Heat and Mass Transfer II class was: “Is hell exothermic or endothermic? Support your answer with proof.”

Most of the students wrote proofs of their beliefs using Boyle’s Law or some variant. One student, however, wrote the following:

“First, We postulate that if souls exist, then they must have some mass. If they do, then a mole of souls can also have a mass. So, at what rate are souls moving into hell and at what rate are souls leaving? I think we can safely assume that once a soul gets to hell, it will not leave.

Therefore, no souls are leaving. As for souls entering hell, let’s look at the different religions that exist in the world today. Some of these religions state that if you are not a member of their religion, then you will go to hell. Since there are more than one of these religions and people do not belong to more than one religion, we can project that all people and souls go to hell. With birth and death rates as they are, we can expect the number of souls in hell to increase exponentially.

Now, we look at the rate of change in volume in hell. Boyle’s Law states that in order for the temperature and pressure in hell to stay the same, the ratio of the mass of souls and volume needs to stay constant. Two options exist:

If hell is expanding at a slower rate than the rate at which souls enter hell, then the temperature and pressure in hell will increase until all hell breaks loose.
If hell is expanding at a rate faster than the increase of souls in hell, then the temperature and pressure will drop until hell freezes over.
So which is it? If we accept the quote given to me by Theresa Manyan during Freshman year, “that it will be a cold night in hell before I sleep with you” and take into account the fact that I still have NOT succeeded in having sexual relations with her, then Option 2 cannot be true…Thus, hell is exothermic.”

The student, Tim Graham, got the only A.

Re: Refigeration gauges

Lokring, Yes, you’re quite right of course. Thanks for pointing that out.
Geoff