An air conditioner in the airport of Timbuktu runs a cooling system using R-410a with high pressure of 1800 kPa and low pressure of 200 kPa. It should cool the desert air at 45°C down to 15°C. Find the cycle COP. Will the system work?

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Aerielle Anne BeltranLv10

29 Jan 2021

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When air is compressed its temperature increases. The compression process can be done in multiple stages with cooling between thestages. This reduces the amount of work required in the compression process.

The two stage compressor shown in the figure below takes in air at room condition(300 K and 100 kPa) and compresses it to 2 MPa. The cooler then cools the air to 340 K, after which it enters the second stage, which has an exit pressure of 15MPa.

Both compression stages are adiabatic and reversble.

(a) Find the specific heat transfer in the intercooler( the amount of heat in kJ/kg that must be removed from the air).

(b) Determine the total specific work.