Problem 2Refrigerant-134a enters the compressor of a refrigeration system as saturated vapor at 0.16 MPa, and leavesas superheated vapor at 0.9 MPa and 70°C at a rate of 0.08 kg/s. Determine the rates of energy transfers bymass into and out of the compressor. Assume the kinetic and potential energies are negligible.

Answered: Image /qna-images/answer/489bc1ec-3530-415f-b1da-2658e925e9c0.jpg

Answered: Problem 2 Refrigerant-134a enters the…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A Carnot vapor refrigeration cycle operates between thermal reservoirs at 7°C and 28°C. The working fluid is saturated vapor at the end of the compression process and saturated liquid at the beginning of the expansion process. Determine the operating pressures in the condenser and evaporator, in bar, and the coefficient of performance for each of the following as the working fluid. (a) Refrigerant 134a (b) Refrigerant R22 (c) water (d) ammonia
2-64 Nitrogen enters a steady-flow heat exchanger at 150 kPa, 10°C, and 100 m/s, and it receives heat in the amount of 120 kJ/kg as it flows through it. Nitrogen leaves the heat exchanger at 100 kPa with a velocity of 200 m/s. Determine the Mach number of the nitrogen at the inlet and the exit of the heat exchanger.
Steam enters a turbine at 15bar and 600°C with a rate of 0.371 kg/s. The steam expands to 0.08 bar with quality at 90%. Stray heat transfer and kinetic and potential energy effects are negligible. For operation at steady state, • the volume flowrate at the turbine outlet is m³/s, ⚫the power developed by the turbine is ⚫and the temperature at the turbine exit is kW, °C.
Refrigerant-134a is throttled from the saturated liquid state at 850 kPa to a pressure of 200 kPa. Determine the temperature drop during this process and the final specific volume of the refrigerant. P₁ = 850 kPa Sat. liquid 규 R-134a P₂ = 200 kPa
The inlet and exit temperatures of the air expanded at an adiabatic turbine are 50 Cand -30 C, respctively, while operating at a plant. The air enters the turbine with a volumetric flow rate of 25 L/s and at 450 kPa. Assume air behaves as an ideal gas with constant specific heats. Calculate the turbine power output (kW) at isentropic conditions if the turbine operates at isentropic efficiency of 75%?
Several liquids are layered inside a tank with pressur- ized air at the top. If the air pressure is 3.2 kPa, calcu- late the pressure at the bottom of the tank if the lay- ers include 20 cm of SAE 10 oil, 10 cm of water, 15 cm of glycerin, and 18 cm of carbon tetrachloride.
B. A Carnot engine operates between two temperature reservoirs maintained at 200°C and 20 °C, respectively. If the desired output of the engine is 15 kW, as shown in Fig. below, determine the heat transfer from the high-temperature reservoir and the heat transfer to the low-temperature reservoir. TH-200°C On Engine QL T₁ - 20°C W 15 kW
problem 5.3 Consider a steam power plant that operates on the ideal reheat Rankine cycle. The plant maintains the boiler at 5000 kPa, the reheat section at 1200 kPa, and the condenser at 20 kPa. The mixture quality at the exit of both turbines is 96 percent. Determine the temperature at the inlet of each turbine and the cycle's thermal efficiency. Answers: 327°C, 481°C, 35.0 percent High-P turbine Low-P turbine Reheater Boiler Condenser 2 Pump
Question 3 A 2L, 4-stroke, 4-cylinder petrol engine has a power output of 113.9 kW at 5500 rpm and a maximum torque of 235 N-m at 3000 rpm. When the engine is maintained to run at 5500 rpm, the compression ratio and the mechanical efficiency are measured to be 8.9 and 83.2%, respectively. Also, the volumetric efficiency is 93.1 %, and the indicated thermal efficiency is 43.76 %. The intake conditions are at 36.9 °C and 1.00 bar, and the calorific value of the fuel is 44 MJ/kg Determine the Air-Fuel ratio in kg/kgf at 5500 rpm. Use four (4) decimal places in your solution and answer.
Consider 5.0 pounds per minute of water vapor at 100 lb/in², 500°F, and a velocity of 100 ft/s entering a nozzle operating at steady state and expanding adiabatically to the exit, where the pressure is 40 lb/in². The isentropic nozzle efficiency is 85.0%. Determine the velocity of the steam at the exit, in ft/s, and the rate of entropy production, in Btu/min-°R.
A 1.5-ft³rigid tank contains saturated refrigerant-134 at 170 psia. Initially, 20 percent of the volume is occupied by liquid and the rest by vapor. A valve at the top of the tank is now opened, and vapor is allowed to escape slowly from the tank. Heat is transferred to the refrigerant such that the pressure inside the tank remains constant. The valve is closed when the last drop of liquid in the tank is vaporized. Determine the total heat transfer for this process. R-134a, Sat. mixture P = 170 psia V = 1.5 ft³
A steam turbine is to operate on a simple regenerative cycle. Steam is supplied dry saturated at 40 bar, and is exhausted to a condenser at 0.07 bar. The condensate is pumped to a pressure of 3.5 bar at which it is mixed with bleed steam from the turbine at 3.5 bar. The resulting water which is at saturation temperature is then pumped to the boiler. For the ideal cycle sketch the process on the T-s diagram and calculate, neglecting feed pump work,The amount of bleed steam required per kg of supply steamThe thermal efficiency of the plantThe specific steam consumption

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