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A heat pump with R-134a as the working fluid is used to keep a space at 25 deg C by absorbing heat from geothermal water that enters the evaporator at 50 deg C at a rate of 0.065 kg/s and leaves at 40 deg C. The refrigerant enters the evaporator at 20 deg C with a quality of 23 percent and leaves at the inlet pressure as saturated vapor. The refrigerant loses 300 W of heat to the surroundings as it flows through the
compressor and the refrigerant leaves the compressor at 1.4 MPa at the same entropy as the inlet.
Determine
a. the degrees of subcooling of the refrigerant in the condenser,
b. the mass flow rate of the refrigerant,
c. the heating load and the COP of the heat pump, and
d. the theoretical minimum power input to the compressor for the same heating load.
Describe how employees learn best, and how to incorporate those methods in the training session.
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Assume a warm air parcel, at sea level, has a temperature of 21°C (70°F) and begins to rise upward. Assume it becomes saturated at 1000 m (3300 ft) altitude, and continues to rise to 2000 m (6600 ft.) altitude. What would the approximate temperature ..
I need help on writing an essay on 'Psychoanalytic, Neoanalytic, Jungian and Individual Psychology.' I need to include:
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One of the best examples of the way in which social class affects life chances is the idea of "The Casualty Gap". The burdens of war, including, importantly, the dying.
As vice president of sales for a rapidly growing company, you are grappling with the question of expanding the size of your direct sales force.
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