When the thermostat calls for second stage heat on an air source heat pump with electric resistance auxiliary heat
A) The heat pump keeps operating and the electric resistance heat is added
B) The electric strip heat shuts off and the heat pump is energized in heating
C) The heat pump shuts down and the electric strip heat comes on
D) The electric strip heat remains on and the heat pump is energized for additional heat
A
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A heat exchanger, operating at steady state, is used to heat an ideal gas. The ideal gas has a constant CP*=5R, molecular weight of 100 g/mol, flowrate of 1000 mol/min, enters at T=100 °C and P=1.1 bar, and leaves at T=190 °C and P=1 bar.
The heat is provided by steam that enters the heat exchanger’s shell side as 50 kg/min of saturated steam at 200 °C. Steam temperature and pressure remain constant in the shell side but a small portion of the steam condenses as heat is transferred to the ideal gas. There are no moving parts in either side of the heat exchanger. A) Determine the quality (vapor fraction) of the exiting liquid-vapor water mixture. B) Determine the rate at which entropy is generated in this heat exchanger. (If you have no answer to part A, assume the quality is 0.97).
Which of the following needs is apparently very important to success as a manager,
according to recent research findings?
a. Self-actualization b. Growth c. Achievement d. Affiliation e. Power
Why are mushroomed chisel heads dangerous?
A) Chips may break off. B) The head becomes extremely bouncy. C) The mushrooms on the head make it slippery. D) The chisel is soft and rotten.
Rear air-conditioning systems use __________
A) An orifice t0ube to control the refrigerant flow into the front evaporator and a TXV with the rear evaporator B) An orifice tube to control the refrigerant flow into the front evaporator and the rear evaporator C) A TXV to control the refrigerant flow into the front evaporator and an orifice tube with the rear evaporator D) A TXV to control the refrigerant flow into the front evaporator and the rear evaporator