What is vapor compression cycle of a refrigeration system?
Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles.
What cycle does a refrigerator work on?
Air cycle refrigeration works on Reversed Carnot cycle and Bell Coleman cycle. Air is compressed and then heat removed, this air is then expanded to a lower temperature than before it was compressed. .
How does a vapor compression cycle work?
The compressor takes in a low temperature, low pressure refrigerant vapor, and compresses it into a high temperature, high pressure vapor. This high temperature/pressure vapor then enters the condenser where heat is removed to either air or water.
What is the most serious results of damage to the stratospheric ozone layer?
Ozone depletion Stratospheric ozone loss can result in potential harm to human health and the environment, including: increased incidence of skin cancer and cataracts. immune system system damage. damage to terrestrial and aquatic plant life.
Which of the following is an approved drop in service replacement for R-22?
As a matter of fact, there are many different alternatives to R-22 that don’t deplete the ozone layer, including: R-134a, R-507, R-404A, R-407c and R-410A. R-410A is the best alternative option for air conditioning applications, while the best alternative for refrigeration applications are R-404A and R-507.
Which of the following refrigerants is very high pressure and generally does not need to be recovered?
This will prevent loss of refrigerant from the hoses. It is not mandatory to repair the leak on small appliances, but it is recommended to do so whenever possible. Co2 refrigerant R-744 (Carbon dioxide) is a very high-pressure refrigerant and generally does not need to be recovered.
Why is it important to not mix different refrigerants in the same container when recovering refrigerant?
When recovering refrigerant it is important not to mix different refrigerant in the some container because? A. The mixture would explode. The mixture may be impossible to reclaim.
What is the strongest evidence that Hcfcs are in the stratosphere?
What is the strongest evidence that CFCs are in the stratosphere? Measurements of CFCs in air samples from the stratosphere. What compounds have the highest ozone depletion potential? May be fined.
Which condition can cause excessive pressure conditions on the high side of a self contained?
What can cause excessive pressure on the high side of an active self-contained recovery device? A closed recovery tank inlet valve or excessive air or other non condensables in the recovery tank (either A or B)
How many access valves are needed to recover the refrigerant on a sealed system?
Two valves
What should a technician do if refrigerant in a recovery cylinder is suspected to be contaminated?
If the refrigerant in a recovery cylinder is suspected to be contaminated, a pressure reading of the cylinder should be taken and compared to a pressure/temperature chart. Recovery cylinders are specifically designed to be refilled. Recovery cylinders have 2 ports, one liquid and one vapor.
What type of appliances are technicians certified to charge and open after passing the Type 1 exam?
What type of appliances are technicians certified to charge and open after passing the Type 1 examination? Appliances containing 5 pounds or less of refrigerant that have been hermetically sealed and charged at the factory.
Can refrigerants be mixed in an appliance?
Do not mix refrigerants. Store recovered refrigerant by refrigerant type (e.g., R-22, R-134a, R-1234yf, etc.)
What happens if you use the wrong refrigerant?
If the wrong refrigerant is put on top of another refrigerant, the Expansion device will become erratic in operation. If the wrong refrigerant is put on top of another refrigerant, the Expansion device will become erratic in operation.
Can R22 and R410a be mixed?
R-22 and R-410a are both refrigerants, true. They can both be used in air conditioners or heat pumps to cool your home during summer. You should never, ever try to mix them in the same system, or use them in a system not rated specifically for that kind of refrigerant.
Can R22 and 407C be mixed?
Mixing R22 with R407C or any other refrigerant. According to the 609 EPA rule, mixing refrigerants is illegal and anybody caught doing so will be heavily fined. If your system is running on R22 most likely is using mineral oil to lubricate the compressor.