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Problem 6.30:
Design a vapor compression refrigeration unit using R290 as the refrigerant. The unit must be capable of pumping 1.5 refrigeration tons of heat at -25 °C. The condenser will be operated using water at 25 °C. Determine the flow rate of the refrigerant and the coefficient of performance assuming the compressor to operate with 80% efficiency. Additional information: One standard refrigeration ton is 12,000 BTU/h (3,517 W). Problem 6.31:
The process shown in Figure 6-19 is part of a chiller unit that uses water as the refrigerant. The following data are available: stream 1 is a vapor-liquid mixture at 0.5 bar; stream 5 is saturated vapor at 5 °C; stream 6 is at 500 °C; stream 7 is at 100 °C. Calculate the following on the basis of 1 kg/s of water in stream 1:
In an experiment to determine specific gravity of a soil sample, the following data is obtained:Mass of empty pycnometer 20.4 g Mass of pycnometer with soil sample 51.6 g Mass of pycnometer with soil sample filled with water 88.6 g Mass of pycnome..
Explain what is meant by the term Threshold Limit Values (TLVs). Describe briefly the different TLVs used by Industrial Hygienists. Outline the strengths and weaknesses of these occupational exposure limits and illustrate how they may best be u..
A thermocouple enclosed in a 3.2mm stainless steel sheath (e = 0.6) is inserted horizontally into a duct to measure the air temperature inside. The walls of the duct are at 650o C, and the true air temperature is 560o C. What temperature will be in..
The nutritional information on a cereal box shows that one serving of dry cereal has 90 calories (actually kilocalories). If one were to burn a serving of cereal, the amount of heat given off would be sufficient to raise the temperature of 1 kg of..
The rate constant of a chemical reaction decreases by decreasing the 1. pressure 2. concentration of reactants
Derive an expression for the optimum economic thickness
What is the identity of the solid? Give the balanced equation of this species decaying by -particle production. Why is the solid a more potent a-particle producer?
The azeotrope contains 61mole % CS2. Estimate the work of separation if the feed solution is liquid at 39.250C and the products are withdrawn at the same temperature. At 39.250C, 1 2 604 ; 400 . S S P mmHg P mmHg?
In Addition, Iodine-131 is used in the diagnosis and treatment of thyroid disease and has a half-life of 8.1 days. If a patient with thyroid disease consumes a sample of Na131I containing 10 of 131I, how long will it take for the amount of 131I to..
What ratio of temperatures for the two samples would produce the same root mean square velocity?
Determine the output voltage. Then indicate how the circuit may be modified to perform as a summer.
Compute the worst voltage regulation and the power factor at which it occurs, when the transformer is delivering rated output at rated secondary terminal voltage of 240 V. Sketch the corresponding phasor diagram.
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