Oil enters a counterflow heat exchanger at 525 K with a mass flow rate of 10 kg/s and exits at 350 K. A separate stream of liquid water enters at 20°C, 5 bar. Each stream experiences no significant change in pressure. Stray heat transfer with the surroundings of the heat exchanger and kinetic and potential energy effects can be ignored. The specific heat of the oil is constant, c = 2 kJ/kg-K. If the designer wants to ensure no water vapor is present in the exiting water stream, what is the minimum mass flow rate for the

Oil enters a counterflow heat exchanger at 525 K with a mass flow rate of 10 kg/s and exits at 350 K. A separate stream of liquid water enters at 20°C, 5 bar. Each stream experiences no significant change in pressure. Stray heat transfer with the surroundings of the heat exchanger and kinetic and potential energy effects can be ignored. The specific heat of the oil is constant, c = 2 kJ/kg-K. If the designer wants to ensure no water vapor is present in the exiting water stream, what is the minimum mass flow rate for the

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Oil enters a counterflow heat exchanger at 600 K with a mass flow rate of 10 kg/s and exits at 350 K. A separate stream of liquid water enters at 20°C, 5 bar. Each stream experiences no significant change in pressure. Stray heat transfer with the surroundings of the heat exchanger and kinetic and potential energy effects can be ignored. The specific heat of the oil is constant, c = 2 kJ/kg · K. If the designer wants to ensure no water vapor is present in the exiting water stream, what is the minimum mass flow rate for the water, in kg/s?
Q/ Super-heated vapor enters condenser of a steam power plant at 2 bar and 250 °C. The vapor is condensed at 0.2 bar and 60 °C. Condensed cooling water enters into another streamline at 25 °C and the water exits at 40 °C. The heat is transferred from the condensing steam to the cooling water with no change in kinetic and potential energies. Calculate (a) the ratio of the cooling water mass flow rate to the condensing steam mass flow rate. (b) The specific heat transfer from the condensing steam to the cooling water. Steam 2 bar 200 C Coodensate 0.2 bar 2 60 C Cooling Cooling water water 25 C 40 C
4. Considering the Typical Energy Balance for gasoline engine, @ atmospheric condition of 1.013 bar and 26°C with constant speed of 2800 rpm, intake air flow rate of 190 Kg/hr, and volumetric efficiency of 75%. If 16.61 KW of energy loss to surrounding was considered. Determine a. The amount of torque in Nm needed b. The mass flow rate of fuel in Kg/hr with calorific value of 45 400 KJ/Kg c. The volume displacement Note: Typical Full Load Energy Balance for Gasoline Engine based on 100% fuel input ЕСТВР -25% ELTCW -30% ELTEG - 37% ELTS 8%
4.30 Refrigerant 134a enters a heat exchanger operating ai steady state as a superheated vapour at 10 bars. 60°C. where it is cooled and condensed to saturated liquid at 10 bars. The mass flow rate of the refrigerant is 10 kg/min. A separate stream of air enters the heat exchanger at 37°C with a mass flow rate of 80 kg/min. Ignoring heat transfer from the outside of the heat exchanger and neglecting kinetic and potential energy effects, determine the exit air temperature, in °C.
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A heavily insulated heat exchanger enters 4 kg/min of refrigerant 134a as a saturated liquid at 0°C. A 1 kg/min stream of air entering at 4 bar and 127°C is cooled to 27°C at constant pressure. determine yourself a) the outlet temperature, in °C, of the refrigerant stream b) the entropy variation of the air, in kJ/K.min
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A condenser of a thermal power plant operates as a surface heat exchanger, 10,000 kg / h of water vapor enters at 0.5 bar and with a quality of 0.95 and the condensate leaves as a saturated liquid at the same pressure. The cooling water enters the condenser as a separate stream at 1 bar and 20 ° C and exits at 35 ° C without pressure change, assuming steady state operation, determine: a) The temperature of the condensed steam b) The amount of cooling water required in m3 / s c) The heat energy transmitted by the steam to the cooling water in Kw
Oil(light) enters a heat exchanger at 450 K with a mass flow rate of 10 kg/s and exits at 350 K. A separate stream of liquid water enters at 20°C, 500 kPa. Each stream experiences no significant change in pressure. Stray heat transfer with the surroundings of the heat exchanger and kinetic and potential energy effects can be ignored. If no water vapor is to be present in the exiting water stream, what is the minimum mass flow rate for the water?
Refrigerant 22 in a refrigeration system enters one side of a counter-flow heat exchanger at 12 bar, 28°C. The refrigerant exits at 12 bar, 20°C. A separate stream of R-22 enters the other side of the heat exchanger as saturated vapor at 2 bar and exits as superheated vapor at 2 bar. The mass flow rates of the two streams are equal. Stray heat transfer from the heat exchanger to its surroundings and kinetic and potential energy effects are negligible. Determine the entropy production in the heat exchanger, in kJ/K per kg of refrigerant flowing. What gives rise to the entropy production in this application? Show state point 1 and 2, then 3 and 4 on a T-s diagram, show the process from 1 to 2 and from 3 to 4. ,(2) 12 bar 20°C 12 bar (1) 28°C (4) 2 bar (3) 2 bar sup. vapor sat. vapor
* Your answer is incorrect. 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 and potential energy effects, determine the temperature change, in °R, as the water flows through the pump. ΔΤ : = i 0.36 °R