Refrigerant 134a at p₁ = 30 lb/in², T₁ = 40°F enters a compressor operating at steady state with a mass flow rate of 150 lb/h and exits as saturated vapor at p2 = 160 lb/in². Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 1.5 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr. R.

Refrigerant 134a at p₁ = 30 lb/in², T₁ = 40°F enters a compressor operating at steady state with a mass flow rate of 150 lb/h and exits as saturated vapor at p2 = 160 lb/in². Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 1.5 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr. R.

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

See similar textbooks

Similar questions

In an air conditioning system running at steady-state, m ̇ = 0.7 kg/s of refrigerant 3 134a in saturated liquid state at 48◦C flow through a throttling valve reducing its pressure to a value of p4 = 4 bars. The system is shown in Fig. 1. Then the refrigerant flows through the internal side of a heat exchanger exiting at saturated vapor with p5 = p4. Air enters the external side of the heat exchanger at T1 = 300 K and exits at T2 = 295 K moved by a fan ̇ Figure 1: Problem 1 that consumes WCV = 0.15 kW. Determine the mass flow rate of the air, in kg/s
Consider a turbine operating at steady-state with the operating conditions shown in the figure. Superheated water vapor enters the turbine with a mass flow rate of m = 5 and superheated water vapor exits at p2 and T2. Ignoring stray heat transfer and kinetic and potential effects: a. Calculate the net power of the turbine, Wr, in kW b. Calculate the entropy produced in kW/K All state properties needed to solve are provided below: State T (°C) p (bar) h (kJ/kg) s (kJ/kg-K) (1 1 240 10 2920.4 6.8817 Wr 2 160 3 2782.3 7.1276 P1 = 10 bar T = 240 °C = 3 bar (2) P2 T2 = 160 °C
Refrigerant 134a at p1 = 30 lbf/in2, T1 = 40°F enters a compressor operating at steady state with a mass flow rate of 350 Ib/h and exits as saturated vapor at p2 = 16O Ib/in?. Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 3.5 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr.°R.
Argon (molar mass 40 kg/kmol) compresses reversibly in an adiabatic system from 5 bar, 25 0C to a volume of 0.2 m3. If the initial volume occupied was 0.9 m3, calculate the work input in MJ to 3 decimal places. Assume nitrogen to be a perfect gas and take cv = 0.3122 k J / k g K.
Water vapors at 40 bar enters a pipe fitting (adapter) with a velocity of 169 m/s and exits thefitting at 10 bar and 572°F. If the temperature at the inlet is 1004°F., calculate the exit velocity.The system is assumed to be at steady state.
1. thermodynamics
Calculate the energy requirement to raise the temperature of 1 kg of water from 60 ° C of water to 90 ° C using the following approach; a. Average specific heat usage (Tab A Singh's Book. 4.1) = kJ b. The enthalpy change in the water - vapor saturation table (Tab A Singh's Book. 4.2) = kJ
Refrigerant 134a at p1 = 30 lb/in?, T1 = 40°F enters a compressor operating at steady state with a mass flow rate of 400 lb/h and exits as saturated vapor at p2 = 160 lb;/in?. Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 4 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr-°R.
Refrigerant 134a at p1 = 30 lbş/in?, T1 = 40°F enters a compressor operating at steady state with a mass flow rate of 250 lb/h and exits as saturated vapor at p2 = 160 lbę/in?. Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 2.5 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr-°R.
Steam enters a turbine operating at steady state at 850oF and 450 lbf/in2 and leaves as a saturated vapor at 1.4 lbf/in2. The turbine develops 12,000 hp, and heat transfer from the turbine to the surroundings occurs at a rate of 2 x 106 Btu/h. Neglect kinetic and potential energy changes from inlet to exit. Determine the exit temperature, in oF, and the volumetric flow rate of the steam at the inlet, in ft3/s.
Refrigerant 134a enters an insulated diffuser as a saturated vapor at 80°F with a velocity of 1400 ft/s. The inlet area is 1.4 in². At the exit, the pressure is 400 lb/in² and the velocity is negligible. The diffuser operates at steady state and potential energy effects can be eglected. Determine the mass flow rate, in lb/s, and the exit temperature, in °F. Step 1 Your answer is correct. Determine the mass flow rate, in lb/s. m = 28.887 Hint Step 2 lb/s. Determine the exit temperature, in °F. T₂ = i OF Attempts: 1 of 4 used
6.14