Water enters an ice machine at 58°F and leaves as ice at 25°F. 169 BTU of...
Water enters an ice machine at 58°F and leaves as ice at 25°F. 169 BTU of energy is needs to be removed from each lbm of water at 58°F to turn it in to ice at 25°F. If the COP of the ice machine is 2.89, determine the required power input, in kW, if the ice machine needs to produce ice at a rate of 28 lbm/hr.
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Water enters an ice machine at 58°F and leaves as ice at 25°F.
169 BTU of...
ID = 38 Problem 027-50E Water enters an ice machine at (60 ID) 'F and leaves...
ID = 38
Problem 027-50E Water enters an ice machine at (60 ID) 'F and leaves as ice at 25'F. Assume latent heat of fusion of ice s 144 Btu/lb) If the COP of the ice machine is 2.4 during this operation, determine the required power input for an ice production rate of 28 pounds per hour. Give answer in both Btu/hr and hp units
Q.3 Outside air at 90°F, 1 atm, and 95% relative humidity with a flow rate of...
Q.3 Outside air at 90°F, 1 atm, and 95% relative humidity with a flow rate of 4000 cfm is blown over an evaporator of a refrigeration system and exits at 75°F and 60% relative humidity. The refrigeration system has operating with the COP of 2.5. Determine (a) the amount of cooling provided by the evaporator Btu/hr (b) the amount of water condensed in the evaporator, lbm/hr and (c) the power required by the compressor of the refrigerator in kW. 1...
10. (25 Points) Steam enters an insulated nozzle at 140 psia, 600 F with a velocity...
10. (25 Points) Steam enters an insulated nozzle at 140 psia, 600 F with a velocity of 100 ft/s. It leaves the nozzle at 20 psia, 360°F. The mass flow rate is 10 lbm/s. Find: Ans a) b) Ans. The actual kinetic energy of the steam at the exit, in Btu The exit velocity in ft/s for part a) The exit cross sectional area of the nozzle, in in The nozzle isentropic efficiency (%) Show the actual and the ideal...
1. Water enters the constant 130-mm inside-diameter tubes of a boiler at 7 MPa and 65°C...
1. Water enters the constant 130-mm inside-diameter tubes of a boiler at 7 MPa and 65°C and leaves the tubes at 6 MPa and 450°C with a velocity of 80 m/s. Calculate the velocity of the water at the tube inlet and the inlet volume flow rate. [5-14] 2. Air enters a nozzle steadily at 50 psia, 140°F, and 150 ft/s and leaves at 14.7 psia and 900 ft/s. The heat loss from the nozzle is estimated to be 6.5...
Question 10 5 pts A steam engine converts 1640 million Btu input energy obtained by burning a fuel into mechanical energy. The steam goes into the turbine at 210 °C and condensed water leaves the tur...
Question 10 5 pts A steam engine converts 1640 million Btu input energy obtained by burning a fuel into mechanical energy. The steam goes into the turbine at 210 °C and condensed water leaves the turbine at 21 °C. Assuming that the turbine operates as an ideal Carnot engine determine the mechanical energy output in MWh. Question 11 5 pts Which ones below are the benefits of hydroelectric power generation? O Hydro electric power don't depend on market conditions. Hydroelectric...
A pump is used to circulate hot water in a home heating system. Water enters the...
A pump is used to circulate hot water in a home heating system. Water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. The inlet pressure and temperature are 14.7 lbf/in.2, and 180°F, respectively; at the exit the pressure is 90 lbf/in.2 The pump requires 1/15 hp of power input. Water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 Btu/lb · °R. Neglecting kinetic...
4: Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 40°C...
4: Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 40°C in a condenser by air. The air enters at 100 kPa and 27 C with a volume flow rate of 600 m3/min and leaves at 95 kPa and 65°C Determine the mass flow rate of the refrigerant. 5: The hot- water needs of a household are to be met by heating water at 55°F to 180°F by solar collector at a rate of 5...
Please answer Questions e-f-g-h: (a) The boiler of a power plant operates at a maximum temperature...
Please answer Questions e-f-g-h: (a) The boiler of a power plant operates at a maximum temperature of 750oC. The condenser of the power plant draws in cooling water at 20oC. What is the theoretical maximum efficiency of the plant? (b) Now suppose that a real power plant is built to have an efficiency that is 80% of the theoretical efficiency. The power plant needs to generate 1GW (giga-watt) of power. How much energy (per second) needs to be supplied by...
A reheat power plant operates between the pressures of 10 MPa and 5 kPa. Steam enters...
A reheat power plant operates between the pressures of 10 MPa and 5 kPa. Steam enters the high and low pressure turbines at 400 °C. If the steam leaves the high pressure turbine at 4 MPa and steam is at saturated vapour state at the end of both turbines, total specific power output of this power plant is; A heat pump is absorbing heat from the cold outdoors at 5°C and supplying heat to a house at 25°C at a...
3. Saturated water vapor at 300°F enters a compressor operating at steady state with a mass...
3. Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow rate of 5 lb/s and is compressed adiabatically to 800 lbf/in. Ignore kinetic and potential energy effects. If the power input is 2150 hp, determine for the compressor a) The isentropic compressor efficiency b) Rate of entropy production (hp/ R)
ID = 38
Problem 027-50E Water enters an ice machine at (60 ID) 'F and leaves as ice at 25'F. Assume latent heat of fusion of ice s 144 Btu/lb) If the COP of the ice machine is 2.4 during this operation, determine the required power input for an ice production rate of 28 pounds per hour. Give answer in both Btu/hr and hp units
Q.3 Outside air at 90°F, 1 atm, and 95% relative humidity with a flow rate of 4000 cfm is blown over an evaporator of a refrigeration system and exits at 75°F and 60% relative humidity. The refrigeration system has operating with the COP of 2.5. Determine (a) the amount of cooling provided by the evaporator Btu/hr (b) the amount of water condensed in the evaporator, lbm/hr and (c) the power required by the compressor of the refrigerator in kW. 1...
10. (25 Points) Steam enters an insulated nozzle at 140 psia, 600 F with a velocity of 100 ft/s. It leaves the nozzle at 20 psia, 360°F. The mass flow rate is 10 lbm/s. Find: Ans a) b) Ans. The actual kinetic energy of the steam at the exit, in Btu The exit velocity in ft/s for part a) The exit cross sectional area of the nozzle, in in The nozzle isentropic efficiency (%) Show the actual and the ideal...
1. Water enters the constant 130-mm inside-diameter tubes of a boiler at 7 MPa and 65°C and leaves the tubes at 6 MPa and 450°C with a velocity of 80 m/s. Calculate the velocity of the water at the tube inlet and the inlet volume flow rate. [5-14] 2. Air enters a nozzle steadily at 50 psia, 140°F, and 150 ft/s and leaves at 14.7 psia and 900 ft/s. The heat loss from the nozzle is estimated to be 6.5...
Question 10 5 pts A steam engine converts 1640 million Btu input energy obtained by burning a fuel into mechanical energy. The steam goes into the turbine at 210 °C and condensed water leaves the turbine at 21 °C. Assuming that the turbine operates as an ideal Carnot engine determine the mechanical energy output in MWh. Question 11 5 pts Which ones below are the benefits of hydroelectric power generation? O Hydro electric power don't depend on market conditions. Hydroelectric...
4: Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 40°C in a condenser by air. The air enters at 100 kPa and 27 C with a volume flow rate of 600 m3/min and leaves at 95 kPa and 65°C Determine the mass flow rate of the refrigerant. 5: The hot- water needs of a household are to be met by heating water at 55°F to 180°F by solar collector at a rate of 5...
A reheat power plant operates between the pressures of 10 MPa and 5 kPa. Steam enters the high and low pressure turbines at 400 °C. If the steam leaves the high pressure turbine at 4 MPa and steam is at saturated vapour state at the end of both turbines, total specific power output of this power plant is; A heat pump is absorbing heat from the cold outdoors at 5°C and supplying heat to a house at 25°C at a...
3. Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow rate of 5 lb/s and is compressed adiabatically to 800 lbf/in. Ignore kinetic and potential energy effects. If the power input is 2150 hp, determine for the compressor a) The isentropic compressor efficiency b) Rate of entropy production (hp/ R)
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