Homework Answers
Question 12 1 pts In a shower, cold water at 10 °C flowing at a rate...
Question 12 1 pts In a shower, cold water at 10 °C flowing at a rate of 5 kg/min is mixed with hot water at 60°C flowing at a rate of 2 kg/min. The exit temperature, in °C, of the mixture is: 14.1 19.3 30.3 320 24.3 26.4 28.0 343
5 pts In a bath, cold water at 60°F flowing at a rate of 4 Ibm/min...
5 pts In a bath, cold water at 60°F flowing at a rate of 4 Ibm/min is mixed with hot water at 120°F flowing at a rate of 1 lbm/min. The specific heat of the hot and cold water is 1 Btu/ibm-R. The exit temperature of the mixture is closest to: 120°F 70°F 80°F 100°F 110F 900 600F Next BI a
D Question 1 1 pts An adiabatic heat exchanger is used to heat cold water at...
D Question 1 1 pts An adiabatic heat exchanger is used to heat cold water at 12 °C entering at a rate of 4 kg/s by hot water entering at 95°C at rate of 2.5 kg/s. The specific heat of water is C_w 4.18 kJ/kg- C. If the exit temperature of hot water is 50 °C, the exit temperature of cold water is O 50 °C 90 °C 95 °C 57 °C 40 °C
A heat exchanger is used to heat cold water at 8C entering at a rate of...
A heat exchanger is used to heat cold water at 8C entering at a rate of 1.2 kg/s by hot air at 90 C entering at rate of 2.5 kg/s. The heat exchanger is not insulated, and is loosing heat at a rate of 28 kJ/s. If the exit temperature of hot air is 20 C, the exit temperature of cold water is
1 pts Cold water at 10°C flowing a rate of 2 kg/s is heated to 35°C...
1 pts Cold water at 10°C flowing a rate of 2 kg/s is heated to 35°C inside a heat exchanger by saturated steam. The steam enters the heat exchanger as saturated vapor at 100 kPa and leaves as saturated liquid at the same pressure. The heat exchanger losses heat at a rate of 20 KW. The mass flow rate of the steam is most nearly: 0.185 0.101 0.748 0.548 0.312 0.243 0.443 0.085
Cold water (Cp = 4180 J/kg · °C) leading to a shower enters a thin-walled double-pipe...
Cold water (Cp = 4180 J/kg · °C) leading to a shower enters a thin-walled double-pipe counter-flow heat exchanger at 15°C at a rate of 0.25 kg/s and is heated to 45°C by hot water (Cp = 4190 J/kg · °C) that enters at 100°C at a rate of 3 kg/s. If the overall heat transfer coefficient is 950 W/m2 · °C. determine the rate of heat transfer and the heat transfer surface area of the heat exchanger using the...
Hot water flows thorough a parallel flow heat exchanger at a rate of 10 kg/min and...
Hot water flows thorough a parallel flow heat exchanger at a rate of 10 kg/min and is cooled by a cold water stream of flow rate 25 kg/min. The inlet temperatures of hot and cold water streams are 70 oC and 25 oC, respectively. The outlet temperature of the hot water is expected to be 50 oC. The individual convective heat transfer coefficient on both sides of the heat transfer area is 600 W/m2 .K. Take the specific heat for...
(c) The diagram below shows part of the heating circuit of a domestic shower. insulated wire...
(c) The diagram below shows part of the heating circuit of a domestic shower. insulated wire water pipe 240 V supply cold water 14°C — hot water 40°C insulated heating element Cold water enters the shower unit and flows over an insulated heating element. The heating element is rated at 7.2 kW, 240 V. The water enters at a temperature of 14°C and leaves at a temperature of 40°C. The specific heat capacity of water is 4.2 x 103 J...
A hot-water stream at 80°C enters a mixing chamber with a mass flow rate of 0.56...
A hot-water stream at 80°C enters a mixing chamber with a mass flow rate of 0.56 kg/s where it is mixed with a stream of cold water at 20°C. If it is desired that the mixture leave the chamber at 42°C, determine the mass flow rate of the cold-water stream. Assume all the streams are at a pressure of 250 kPa. The enthalpies are 335.02 kJ/kg, 83.915 kJ/kg, and 175.90 kJ/kg. The saturation temperature at a pressure of 250 kPa...
P11-104. Cold water (Cp = 4180 J/kg-K) leading to a shower enters a thin-walled double-pipe counterflow...
P11-104. Cold water (Cp = 4180 J/kg-K) leading to a shower enters a thin-walled double-pipe counterflow heat exchanger at 15°C at a rate of 0.25 kg/s and is heated to 45°C by hot water (cp=4190 J/kg K) that enters at 100°C at a rate of 3 kg/s. If the overall heat transfer coefficient is 950 W/m2.K, determine the rate of heat transfer and the heat surface area of the heat exchanger using the effectiveness-NTU method.
Question 12 1 pts In a shower, cold water at 10 °C flowing at a rate of 5 kg/min is mixed with hot water at 60°C flowing at a rate of 2 kg/min. The exit temperature, in °C, of the mixture is: 14.1 19.3 30.3 320 24.3 26.4 28.0 343
5 pts In a bath, cold water at 60°F flowing at a rate of 4 Ibm/min is mixed with hot water at 120°F flowing at a rate of 1 lbm/min. The specific heat of the hot and cold water is 1 Btu/ibm-R. The exit temperature of the mixture is closest to: 120°F 70°F 80°F 100°F 110F 900 600F Next BI a
D Question 1 1 pts An adiabatic heat exchanger is used to heat cold water at 12 °C entering at a rate of 4 kg/s by hot water entering at 95°C at rate of 2.5 kg/s. The specific heat of water is C_w 4.18 kJ/kg- C. If the exit temperature of hot water is 50 °C, the exit temperature of cold water is O 50 °C 90 °C 95 °C 57 °C 40 °C
1 pts Cold water at 10°C flowing a rate of 2 kg/s is heated to 35°C inside a heat exchanger by saturated steam. The steam enters the heat exchanger as saturated vapor at 100 kPa and leaves as saturated liquid at the same pressure. The heat exchanger losses heat at a rate of 20 KW. The mass flow rate of the steam is most nearly: 0.185 0.101 0.748 0.548 0.312 0.243 0.443 0.085
(c) The diagram below shows part of the heating circuit of a domestic shower. insulated wire water pipe 240 V supply cold water 14°C — hot water 40°C insulated heating element Cold water enters the shower unit and flows over an insulated heating element. The heating element is rated at 7.2 kW, 240 V. The water enters at a temperature of 14°C and leaves at a temperature of 40°C. The specific heat capacity of water is 4.2 x 103 J...
P11-104. Cold water (Cp = 4180 J/kg-K) leading to a shower enters a thin-walled double-pipe counterflow heat exchanger at 15°C at a rate of 0.25 kg/s and is heated to 45°C by hot water (cp=4190 J/kg K) that enters at 100°C at a rate of 3 kg/s. If the overall heat transfer coefficient is 950 W/m2.K, determine the rate of heat transfer and the heat surface area of the heat exchanger using the effectiveness-NTU method.
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