The figure belows shows three components of an air-conditioning system, where T3 = 105°F and m3 = 1.5 lb/s. Refrigerant 134aflows through a throttling valve and a heat exchanger while air flows through a fan and the same heat exchanger. Data for steady-stateoperation are given on the figure. There is no significant heat transfer between any of the components and the surroundings. Kineticand potential energy effects are negligible.AirT1 = 535°RC, = 0.240 Btu/lb-°RSaturated liquid R-134aT3, ṁ33.Fan= -0.2 hpThrottlingvalveSaturated vaporP5=P4P4 = 60 lbf/in.2T2= 528°R2Heat exchangerModeling air as an ideal gas with constant c, = 0.240 Btu/lb · °R, determine the mass flow rate of the air, in Ib/s.m¡ =iIb/s

Answered: Image /qna-images/answer/7e0f9d9f-b0ea-4dcc-aacc-5549de5b280e.jpg

Answered: The figure belows shows three…

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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The Figure shows a solar collector panel embedded in a roof. The panel, which has a surface area of 24 ft2, receives energy from the sun at a rate of 200 Btu/h per ft2 of collector surface. Twenty-five percent of the incoming energy is lost to the surroundings. The remaining energy is used to heat domestic hot water from 90 to 120°F. The water passes through the solar collector with a negligible pressure drop. Neglecting kinetic and potential effects, determine at steady state how many gallons of water at 120°F the collector generates per hour.
The figure below shows a turbine-driven pump that provides water to a mixing chamber located dz⁢= 5 m higher than the pump, where m˙=50 kg/s. Steady-state operating data for the turbine and pump are labeled on the figure. Heat transfer from the water to its surroundings occurs at a rate of 2 kW. For the turbine, heat transfer with the surroundings and potential energy effects are negligible. Kinetic energy effects at all numbered states can be ignored. Determine:(a) the magnitude of the pump power, in kW.(b) the mass flow rate of steam, in kg/s, that flows through the turbine.
Find the minimum work done per Kg of air in a cycle according to the following process: a. isothermal expansion from state 1 to state 2 b. Constant volume compression form state 2 to state 3 c. Constant pressure compression from state 3 to the initial state Data: P1= 350KPa T3= 1650⁰C V1 = 1 m³/Kg represent the work in a P-V diagram
3. A thermodynamic system operates under steady flow conditions, the fluid entering at 2 bar and leaving at 10 bar. The entry velocity is 30 m/s and exit velocity is 10 m/s. During the process 25 MJ/hr of heat from an external source is supplied and the increase in enthalpy is 5kJ/kg. The exit point is 20 m above the entry point. Determine flow work from the system if the fluid flow rate is 45 kg/min.
A fluid expands reversibly according to a linear law from 3.8 bar to 1.1 bar, the initial volume is 0.006 m3. The fluid is then cooled reversibly at constant pressure, and finally compressed reversibly according to a law pv = constant back to the initial conditions of 3.8 bar and 0.006 m3. Calculate the net work of the cycle if the work done during the constant pressure cooling is given by 5930 N.m. Sketch the cycle on a p-v diagram
Develop the general energy balance applied to closed systems
A piston and cylinder device contains 0.15 kg of water at 25◦C (state 1). As shown in the figure, the piston weighs 500 N and has a cross-sectional area of 0.01 m2. Atmospheric pressure is 100 kPa. Heat is transferred to the cylinder from a reservoir at 200◦C, raising the piston. When the piston touches the stops, the volume inside the cylinder is Vmax= 0.165 m^3 (state 2). Heat continues to be transferred until the control mass reaches the boundary temperature (state 3). Determine: a) The initial pressure of the water (kPa) b) The temperature (Celsius) when the piston hits the stops c) The total work (kJ) d) The total heat transfer (kJ) e) The total entropy production for the entire process (kJ/K)
) Two boilers, one with superheater(B1) and other without superheater(B2) are delivering equal quantities of steam into a common main. The pressure in the boiler and main is 20 bars. The temperature of the steam from a boiler with a superheater is 350oC and temperature of the steam in the main is 250oC. The steam in B2 is wet steam at 20oC. i) Draw a sketch of the problem with all thermodynamic properties from steam table shown on the sketch. ii) Determine the quantity of steam supplied by the other boiler. Take the heat capacity of steam, Cps = 2.25KJ/Kg.hgas= hg + Cps (Tsap-Tsat)
Give solution to the thermodynamics problem.
An industrial sized boiler, operates at a pressure of 20 bar. Saturated liquid enters the boiler and at the exit becomes steam with a temperature of 1100 K. Determine the following: a. Heat transfer (kJ/kg) b. Change in internal energy (kJ/kg) c. Change in Entropy (kJ/kg.K)
Shown below is the plot for three processes from state 1 to state 2. Select the area that represents the minimum boundary work in the plot. A. A B. B C. C
Assume 9.84 lb/sec of fluid enter a steady-state, steady-flow system with P₁ = 107.18 psia, p₁ = 0.379 lb/ft³, u₁ = 94.7 fps, u₁ = 793.87 BTU/lb, and leave with P2 = 28.47 psia, p2 = 0.122 lb/ft³, u2 = 450.93 fps, and u2 = 750.79 BTU/lb. During the passage through the open system, each pound rejects 10.6 BTU of heat. Determine the work in hp.

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