Chapter 5, Problem 5.3E

Solve last 3 parts

The figure belows shows three components of an air-conditioning system, where T3 = 115°F and ng = 3 lb/s. Refrigerant 134a flows through a throttling valve and a heat exchanger while air flows through a fan and the same heat exchanger. Data for steady-state operation are given on the figure. There is no significant heat transfer between any of the components and the surroundings. Kinetic and potential energy effects are negligible. Air T = 535°R p= 0.240 Btu/lb-"R Saturated liquid R-134a T3, m3 Fan Wey=-0.2 hp Throttling valve 5 www Saturated vapor Ps=P4 P.= 60 lbfin.? T;= 528°R +2 - Heat exchanger Modeling air as an ideal gas with constant c, = 0.240 Btu/lb - °R, determine the mass flow rate of the air, in Ib/s. mi = Ib/s

The figure belows shows three components of an air-conditioning system, where 105°F and 4.5 lb/s. Refrigerant 134a flows through a throttling valve and a heat exchanger while air flows through a fan and the same heat exchanger. Data for steady-state operation are given on the figure. There is no significant heat transfer between any of the components and the surroundings. Kinetic and potential energy effects are negligible. Modeling air as an ideal gas with constant cp = 0.240 Btu/lb · °R, determine the mass flow rate of the air, in lb/s.

1- A boiler plant comprises a boiler, superheater, economizer and air preheater. The feedwater enters the economizer at 45 °C. Air is preheated from a temperature of 15 °C to 150 °C. The steam is generated in the boiler at a pressure of 35 bar, 0.98 dry and leaves the superheater at 350 °C. When using oil of calorific value 42 MJ/kg, the evaporation rate is 10 kg steam per kg fuel and the air to fuel ratio is 20: 1 by mass. Neglecting heat losses and pressure drops, estimate the heat transfer per kg fuel in each component and the plant efficiency. Assume cp for air and flue gas as 1.005 and 1.045 kJ/ kg K, respectively.

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2) A heat pump with the amount of heat of liquid refrigerant (mix) when it will enter the expansion of 480 Btu/lb. while the amount of heat from the refrigerant vapor after leaving the evaporator is 412 Btu/lb. What is the coefficient of performance (COP) if the heat amount of the superheated refrigerant after being compressed by the compressor has a value of 572 Btu/lb?

As shown in the figure, an air conditioner operating at steady state maintains a dwelling at 70°F on a day when the outside temperature is 103.5°F. The rate of heat transfer into the dwelling through the walls and roof is 30,000 Btu/h and the net power input to the air conditioner compressor is 3.45 hp. Step 1 B Inside, 70° F Determine the coefficient of performance for the air conditioner. = Evaporator i 30,000 Btu/h Determine the coefficient of performance of the air conditioner. Determine the power input required, in hp, and the coefficient of performance for a reversible air conditioner providing the same cooling effect while operating between the same cold and hot temperatures. Refrigerant loop Compressor Outside Q + Condenser

1. Steam enters a turbine with an enthalpy of 1292 Btu/lb and leaves with a enthalpy of 1098 Btu/lb. the transferred heat is 13 Btu/lb. what is the work in Btu/min and in hp for a flow of 2 lb/sec? Hint:1 Btu/min = 42.4 hp. 2. A thermodynamic steady flow system receives 4.56 kg/min of a fluid where p1 %3D 137.90 kPa, Vị = 0.0388 7m Vi = 122, and u = 17.16. The fluid leaves the %3D kg' kg system at a boundary where p2 = 551.6 kPa, v2 = 0.193 kl = 183, and ug %3D v2 %3D kg' 52.80 during passage through the system the fluids receives 3,000 of heat. kg Determine the work. Hints: (a) you have a positive heat(Q), (b)your unit in your final answwer is min." 3. In a steady flow apparatus, 135 kJ of work is done by each kg of fluid. The specific volume of the fluid, pressure and speed at the inlet are 0.37 m3 600 kg' 77L kpa, and 16 - respectively. The inlet is 32 m above the floor, and the discharge pipe is at floor level. The discharge conditions are 0.62 , kg 100 kpa, and 270 kg kJ The total…