What is the example of a device undergoing transient (rather than steady-state) operation? Group of answer choices the turbine that is not heating up or cooling down the electric motor that has just been turned off and it starts to cool the heat exchanger where the neither mass nor energy is accumulated inside the nozzle/diffuser system that has been operating continuously for 3 hours

What is the example of a device undergoing transient (rather than steady-state) operation? Group of answer choices the turbine that is not heating up or cooling down the electric motor that has just been turned off and it starts to cool the heat exchanger where the neither mass nor energy is accumulated inside the nozzle/diffuser system that has been operating continuously for 3 hours

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter33: Hydronic Heat

Section: Chapter Questions

Problem 25RQ: The temperature of the water at the outlet of a three-way mixing valve will most likely be A. equal...

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Frost accumulates on the evaporators of forced-draft refrigerators because A. they are generally located within a house. B. they are generally located in high-humidity areas. C. they are low-temperature appliances. D. there is a heat exchange with the suction line.
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Problem 2 – Heat Pump Thermodynamic Analysis Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 50°C at a rate of 35 L/min and leaves at 750 kPa subcooled by 3°C. The refrigerant enters the compressor at 200 kPa superheated by 3°C. Neglecting changes in kinetic and potential energy and any stray heat transfer, please answer the following. a. Create a schematic of the cycle, use the same numbers used in your textbook for the inlet and exit states of each device, and include the energy exchanges between the cycle devices and the surroundings. b. Sketch the cycle processes on a T-s diagram. c. Determine the isentropic efficiency of the compressor. d. Compute the rate of heat supplied to the heated room. e. Determine the COP of the heat pump.
An 500-HP engine with a thermal efficiency of 30% is using a remote radiator which absorbs 20% of the heat supplied to the engine. Cooling system with cooling tower is used with a cooling range of 5°C. The temperature rise after passing the remote radiator is 10°C. Air enters the cooling tower at 30°C dry-bulb; 20°C wet-bulb temperatures and leaves the tower at 38°C & 65%RH. Make a schematic diagram of the system, the process in the provided psychrometric chart and calculate the following: (a.) The amount of cooling water for the engine, kg/min; (b.) The water flow rate in the cooling tower in liters per hour; and (c.) If the heat absorbed by air is 5% of heat absorbed by the cooling tower water, what is the air flow needed in cu.m/hour.
Problem # 2: In a steam thermal plant, it operates with a condenser outlet temperature of 180 ° F, and a boiler outlet temperature of 1000 ° F. If the pressure at the pump outlet is 300 psia. If the efficiencies of the turbine and pump are 85%. Determine: a.) The real work of the turbine, in Btu / Ibm. b.) The actual work of the pump, in Btu / Ibm. c.) The thermal efficiency of the real cycle. d.) The thermal efficiencies of the ideal cycle and Carnot. e.) Diagram T vs s, with all possible values and indicating the real and ideal cycles.
The following image describe a single-flash geothermal power plant. We have the follow informations about the system: The flash chamber (throttling valve) is a isenthalpic device The system is adiabatic The power generated by the turbine is 10kW The pressure and temperature at point 4 are 50 kPa and 100°C respectively The pressure at separator is 500 kPa The separator has the function of separating the phases of a saturated mixture The mass that exits the system through the separator is 5 times the mass that exits the turbine. The pressure at point 1 is 1 MPa If all the information is sufficient, fill in the table below and plot all the points on a T x v graph.