Enhancement Necessary Two Questions 1 Likely Use Refrigerator Days Life Refrigerator Heat Q28206258
No enhancement necessary, because there are two questions 1. You are likely to use a refrigerator most days of your life. Your refrigerator is a heat pump that makes use of the expansion and compression of gas to move heat from inside the refrigerator to the outside. You can learn more about the refrigerant cycle if you read page 13 of the week2 lecture slides or you can watch the video at https:// www.youtube.com/watch?v-nA-XbfxqgRo For food safety reasons, your refrigerator should be kept below T-4°C Most people keep their refrigerator at 2°C. The internal dimensions of my refrigerator are 1.0m x 51cm x 65cm. I keep my apartment temperature at a comfortable 68 F My refrigerator takes refrigerant HFC-134a gas (which does not deplete the ozone) from the coils inside the fridge and compresses it adiabatically (i.e. with no heat loss). This heats the gas to T>Toutside and pushes it into the coils on the outside of the fridge. Once outside the gas is cooled down to the outside temperature a) What is the maximum possible COP for this fridge? b) The gas in the coils inside the refrigerator is at a lower temperature than the refrigerator so that t can absorb heat (T-23 C and 0.6 bar). This is compressed adiabatically in the compressor to a temperature of 95°C to 8bar. If there are 2.5 x 1018 molecules going into the compressor in each cycle, what is the change in thermal energy of the gas? c) What is the work done on the gas? d) If refrigerator is operating at optimal COP, draw a heat pump cycle for refrigerator and show the energy transfers in the system Show transcribed image text