Find the cop and temperature at which it can deliver energy
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A refrigerator in a laboratory uses R-134a as the working substance. Find the cycle COP and the electrical power required.
What is the mass flow rate of the R-134a, and what is the low-temperature heat transfer rate? What is the mass flow rate of air at 10oC?
After the compressor, the temperature is measured to be 60oC. Find the actual compressor work and the actual cycle COP.
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A heat pump uses R410a with a high pressure of 3000 kPa and an evaporator operating at -10oC. Find the COP and the temperature at which it can deliver energy.
Find the specific heat transfer from the cold space and that to the hot space, the COP, and the isentropic efficiency of the compressor.
A heat pump for heat upgrade uses ammonia with a low temperature. If it receives 1 MW of shaft work, what is the rate of heat transfer at the high temperature?
Find the high temperature, the condensing temperature and the COP if it is used in a standard cycle with high and low pressures of 6 MPa and 3 MPa respectively.
In "What Was Volkswagen Thinking?," Jerry Useem (2016) discusses James Burke, the CEO of Johnson & Johnson.
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