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A gas refrigeration system using air as the working fluid has a pressure ratio of 5. Air enters the compressor at 0°C. The high-pressure air is cooled to 35°C by rejecting heat to the surroundings. The refrigerant leaves the turbine at -80°C and then it absorbs heat from the refrigerated space before entering the regenerator. The mass flow rate of air is 0.4 kg/s. Assuming isentropic efficiencies of 80 percent for the compressor and 85 percent for the turbine and using constant specific heats at room temperature, determine (a) the effectiveness of the regenerator, (b) the rate of heat removal from the refrigerated space, and (c) the COP of the cycle. Also, determine (d) the refrigeration load and the COP if this system operated on the simple gas refrigeration cycle. Use the same compressor inlet temperature as given, the same turbine inlet temperature as calculated, and the same compressor and turbine efficiencies.
Run the system for a single replication of 8 hours to observe the time in the system for both types of customers.
The methodology in summary form is to design and implement improvements to the nickel-iron battery. This is your basic methodology, which needs more detail in the type of tests you will perform.
If the total range of voltages started at zero and there are 512 intervals, what would the maximum possible voltage be?
Determine the required airflow for diesel dilution at the face of the heading if the requirement is for 0.05 m3/s of air per kW of diesel power and what is the total development airflow
Search the Internet for pertinent information that supports the integration of unmanned aerial systems into the National Airspace Plan and the Air Traffic Control system.
a flat field with a standard surface of water which needs to get to 50000 people by means of a water treatment facility
Describe environmental issue that has national and Global implications. For this issue, develop a Policy Initiative for a private organisation.
find the optimum solution or optimum solutions. Does the model have infeasibility, unique optimum, alternative optima, or unboundedness?
environmental engineeringquestion 1 iron species in solution exist in two major forms with different charges
How long does it take to grow 100nm of oxide in wet oxygen at 1000oc (assume 100crystal orientation of silicon) ? In dry oxygen? Which process would be perfect?
Formulate a linear programming model for problem. Define decision variables, and then define your constraints and objective function accordingly. Combine everything to get the final model.
What would be your ideal situation if you are the prosecuting attorney?
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