Consider an actual vapor-compression refrigeration cycle. R-134a enters the compressor as superheated vapor at 0.18 MPa and -10°C at a rate of 0.055 kg/s, and it leaves at 1.2 MPa and 60°C. The refrigerant is cooled in the condenser to 42°C and 1.15 MPa, and it is throttled to 0.22 MPa. Determine the rate of heat addition to the evaporator, in kW.
Q: How many turns should a 14 cm long solenoid have if it is to generate a 0.875 mT magnetic field when...
A: following is the solution for the above problem-
Q: A vertical rod of length L and diameter d is fixed at its upper end and carries a load Wat its lower...
A:
Q: 10- A piston-cylinder device contains 5 kg of saturated water vapor at 3 MPa. Now heat is rejected f...
A: Given:mass of the saturated vapor, m=5 kgPressure of saturated liquid, Pf=3 MPaPressure of saturated...
Q: P5.37 The volume flow Q through an orifice plate is a function of pipe diameter D, pressure drop Ap ...
A:
Q: Water (Cp = 4200 J/kg: °C) is used cool an unknown fluid (with a given Cp = 3810 J/kg-°C) using a tw...
A: Unknown fluidmh˙=1.46 kg/sCph=3810 J/kgoCTh1=66oCTh2=39oC Cooling fluid...
Q: Water (Cp = 4200 J/kg. °C) is used cool an unknown fluid (with a given Cp = 3810 J/kg.°C) using a tw...
A:
Q: fillet weld on low carbon steel has a cross‑sectional area of 25.0 mm2 and is 900 mm long. Determine...
A:
Q: The tension in the supporting cable AB is 10 kN. Write the force which the cable exerts on the boom ...
A:
Q: 13. What are the major functions of drill string in drilling engineering?
A: Since we only solve one question, we will answer the first. Please resubmit the other questions you ...
Q: Q1// A heat engine operates between a source at 550°C and a sink at 25°C. If heat is supplied to the...
A:
Q: meitttangulai compONtits of tmt attticiaLION at pomI A 20. Determine the force P that will give the ...
A:
Q: 40 kN 15 kN 30 3. Two forces are acting on a beam as shown. Determine a single resultant force and s...
A:
Q: Calculate the maximum load (P) that can be supported by the knuckle joint that shown in the figure b...
A:
Q: The 3.0 kg pendulum with mass center G is pivoted at A to the ficed support CA. It has a radius o gy...
A:
Q: A flat belt is used to transmit a couple from pulley A to pulley B . The radius of each pulley is 50...
A:
Q: Calculate the weight of block A shown in the figure. 37 530 36 N
A:
Q: A mass weighting 1.25 kg stretches a spring 0.1 m. The mass is in a medium that exerts a viscous res...
A:
Q: What is the discharge of the pump?
A: To find Discharge of pump
Q: Steam is generated in the boiler of a cogeneration plant at 9 MPa and 450C at a steady rate of 5 kg/...
A: Here we have at 20 kPa h1=hf=251.42 KJ/kgv1=vf=0.001017 m3/kg
Q: Rod DC rotates counterclockwise with angular velocity N of 2 rad/s. Determine: The angular velocity ...
A:
Q: 5.5 An automobile has a characteristic length and area of 8 ft and 60 ft²', respectively. When teste...
A: Answer: The properties of air at sea level are: P = 0.00238 slug/ft3μ =3.72x10-7 slug/ft.s The Reyno...
Q: :A simple VCRC using R-134a operates with a condensing temperature of 30°c and an evaporating temper...
A:
Q: Q1) A beam undergoes shear of V = 27 kN, determine the web's shear stress at A and B. Indicate the s...
A: Solution to Q1 as per our company policy:
Q: Rod DC rotates counterclockwise with angular velocity N of 2 rad/s. Determine: The angular velocity ...
A:
Q: An inert gas held in a plunger undergoes three stages: Stage 1-2: the gas is compressed without any ...
A:
Q: 1) Engine oil at 80°C flows over a 6-m-long flat plate whose temperature is 30°C with a velocity of ...
A:
Q: Determine the tension needed in cables AB, BC, and CD to support the 12-kg and 15-kg traffic lights ...
A:
Q: m k 0.61 0.61 Drive the equation of motion of the above structure using two methods comparing the eq...
A:
Q: Fused deposition modelling is an additive manufacturing process where a binder is used to join the m...
A: Fused Deposition modeling is an additive manufacturing process in which 3D objects are manufactured....
Q: A 50 mm by 100 mm timber is used as a columns with fixed ends. Determine the minimum length at which...
A: Given:Timber dimension=50 mm×100 mmE=10 GpaProportional limit=30 MPa2nd part,Length, l=2.5 mFoS=2
Q: A common actuator in control systems is the DC motor. It directly provides rotary motion and, couple...
A:
Q: 8 kg/s of R134a is condensed from 700 KPa and 70 °C to saturated liquid at 700 KPa in a water- coole...
A: Given Data Mass flow rate of refrigerant=8 kg/s State 1: 700 kPa,70°C State 2: saturated liquid,700...
Q: P1-1. Draw a free-body diagram of the ring at A and identify each force. 30 45° 200 N 500 N
A: As per bartleby guidelines we are allowed to solve only 1st question if multiple questions are poste...
Q: The velocity of a particle traveling along a straight line is v= (312 - 6t) ft/s, where t is in seco...
A: Given: Velocity of the particle→v=312-6t fts We know that→v=dsdt Hence: →dsdt=312-6t→ds=312-6tdt→∫d...
Q: 2) Consider the system shown in the figure. If a change of 0.9 kPa in the pressure of air causes the...
A:
Q: Hydrogen is expanded in a cylinder in an equilibrium process from initial conditions of volume of 0....
A: It is very basic question of thermodynamics. Used concept is work done in a closed system.
Q: An arc welding operation on nickel performs a groove weld, whose cross-sectional area = 20.0 mm2. Th...
A:
Q: The velocities of the particles at an instant are VA = 6m/s and VB= 8m/s, with the angle between the...
A:
Q: In a mass spectrometer a beam of singly-charged ions pass through a velocity filter that selects ion...
A:
Q: 10. What are the component of pressure loss of drilling fluids flow for a well drilling? What's the ...
A: Since we only answer one question at once, we will solve the first. Please resubmit the other questi...
Q: QUESTION 1: A centrifugal pump consists out of an impeller, diffuser and casing and is powered by 30...
A:
Q: The velocity of a particle travelling along a straight line is v = (3t^2 - 6t) ft/s, where t is in s...
A: Given data as per question v = (3t^2 - 6t) ft/s Calculations The Position of particle can be determi...
Q: Find the discharge if flow velocity 0.8 m/s and area of channel 0.3 m2
A: Given data : Area of channel=A Flow velocity=V Find : Discharge
Q: One mole of an ideal gas, originally at a volume 8.21 liters at 1,000 K, is allowed to expand adiaba...
A:
Q: Homework; In Figure below, a cantilever beam is subjected to an inclined force (P); calculate: 1- Th...
A:
Q: 1. Suppose that a car at rest begins accelerating at a constant rate of 15ft/sec2. (a) Determine how...
A: It is very basic question of mechanics. Topic motion under constant acceleration. Used concept is eq...
Q: -why should the supply frequency be maintained constamt
A:
Q: Water (Cp = 4200 J/kg- °C) is used cool an unknown fluid (with a given Cp = 3810 J/kg.°C) using a tw...
A:
Q: the velocity of a particle traveling along a straight line is v=(3t^2-6t) ft/s, where t is in second...
A:
Q: Theoretical calculations: 3. How dose the bandwidth change in relation to increasing signal amplitud...
A: Answer: consider the wide band Frequency modulation ( WBfm) β ⇒ modulation Index ⇒▵ ffm β = kf...
Step by step
Solved in 2 steps with 2 images
- Refrigerant 134a enters the compressor of a vapor-compression refrigeration cycle at 150 kPa as a saturated vapor and leaves at 850 kPa. The refrigerant leaves the condenser as a saturated liquid. The rate of cooling provided by the system is 7kW. a. Determine the mass flow rate of R-134a and the cop of the cycle. b. If the condenser pressure is changed to 950 kPa, find the cop of the cycle.a) A freezer working on an ideal vapour-compression refrigeration cycle uses refrigerant R- 134a with a mass flow rate of 0.10 kg/s. The refrigerant leaves the evaporator as saturated vapour at a temperature of -8 °C. It leaves the condenser as saturated liquid at a pressure of 0.8 MPa. Determine the power required to drive the compressor. Note that the thermodynamic properties of R-134a are attached at the end of the paper. 0.8 MPa A Figure Q4 b) A freezer wall is made of a composite material with a thickness of 20 mm and a conductivity of 0.03 W/m-K. Air temperatures inside and outside the freezer are -6 °C and 20 °C, respectively. The convection coefficient is 2 W/m² K on both the inner and outer surfaces of the freezer wall. Determine the heat flux through the freezer wall. -8 CAn ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and the evaporator at 15 kPa. Given 300 kW of cooling load, determine the following: 3. Estimate the reversible COP values, if the low and high medium temperature are as for the evaporator and condenser. 4. Determine the Refrigeration effect (RE), heat of compression (HOC), and heat of rejection (HOR) and their corresponding rate/power values in kW. 5. Estimate the COPR using thermodynamic tables 6. Calculate the COPR using the P-h chart and show the refrigeration cycle on the p-h chart.
- Refrigerant-134a enters the compressor of a refrigerator at 140 kPa and -10°C at a rate of 0.3 m3/min and leaves at 1 MPa. The isentropic efficiency of the compressor is 78 percent. The refrigerant enters the throttling valve at 0.95 MPa and 30°C and leaves the evaporator as saturated vapor at -18.5°C. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the power input to the compressor, (b) the rate of heat removal from the refrigerated space, and (c) the pressure drop andrate of heat gain in the line between the evaporator and the compressor. answers 1.88 kW, 7.11 kW, 1.72 kPa, 0.24 kWA vapor-compression refrigeration system uses R-134a. The evaporator pressure is 200.60 kPa and a condenser pressure of 770.20 kPa. The refrigerant enters the compressor as a saturated vapor and leaves the condenser as subcooled liquid at 20°C (there is subcooling from Tsatn to 20°C). Calculate the following: (a) The flowrate of R-134a in kg/s, if the refrigeration capacity is 35.5 kw (b) Work requirement in the compressor in kl/kg, if the compressor efficiency is 0.80 (c) COP of the refrigeration cycle. (d) Provide the P-H diagram of the cycle.A vapor compression cycle with R-134a is being used as its refrigerant. The refrigerant leaves the evaporator at -10 C and 120 kPa and it enters the condenser 1.0 MPa. Assuming there is a heat loss due to compression which is equal to 20 kJ/kg, and it has a cooling capacity of 75 tons of refrigeration, Determine the following: (a)heat rejected (b)cooling effect (c)work of compression (d) coefficient of performance (e)volume flow rate of refrigerant (f)compressor discharge temperature
- A vapor compression refrigeration system with R-134a as refrigerant is used to cool down 0.1 m3/s air at 25°C and 20% RH to 15°C. The condenser outlet is at 36°C and 9.1 bar and the evaporator outlet is at 0°C and 2 bar. Calculate the power requirement of the compressor, COP of the system and the temperature of the refrigerant at compressor outlet.A refrigerating system has a load of 50 kJ/s uses ammonia as working fluid. The refrigerated space is kept at a temperature of –30°C. Condensing pressure is at 1.0 MPa. The ammonia refrigerant exits the evaporator with 5-degree superheat and at 160 kPa. Superheated refrigerant is discharged from the compressor at a temperature of 140°C. Wire drawing at the compressor suction is 5 kPa and the compressor discharge is 20 kPa. If the overall mechanical efficiency is 82%, determine the power input to the compressor.An ideal vapor-compression refrigeration cycle using refrigerant-134a as the working fluid is used to cool a brine solution to -5°C. This solution is pumped to various buildings for the purpose of air-conditioning. The refrigerant evaporates at -12.00°C with a total mass flow rate of 8.000 kg/s and condenses at 600 kPa. Determine the COP of the cycle and the total cooling load. (Take the required values from saturated refrigerant-134a tables.) The COP of the cycle is (Round the final answer to three decimal places.) and the total cooling load is kW.
- Refrigerant vapor enters into the compressor of a standard vapor compression cycle at - 10°C (h = 402 kJ/kg) and leaves the compressor at 50°C (h = 432 kJ/kg). It leaves the condenser at 30°C (h = 237 kJ/kg). Calculate the COP of the cycle.Refrigerant-134a enters the compressor of a cooling system as superheated vapor at 0.18 MPa and 0°C with a flow rate of 0.15 kg/s. It exits the compressor at 0.8 MPa and 60°C. Post compression, the refrigerant is cooled in the condenser to 28°C and 1.4 MPa. Subsequently, it's throttled to 0.16 MPa. Neglecting any heat transfer and pressure drops in the pipelines between the components, represent the cycle on a T-s diagram concerning saturation lines. Calculate: (a) The rate of heat extraction from the cooling area and the energy input to the compressor. (b) The isentropic efficiency of the compressor. (c) The Coefficient of Performance (COP) of the cooling system.A refrigeration system operates on an ideal vapor compression using R-12 with an evaporator temperature of -30 C and a condenser exit temperature of 49.30C and requires 74.6 kW motor to drive the compressor. What is the capacity of the refrigerator in tons of refrigeration? Enthalpy at the condenser ,entrance = 382KJ/Kg, exit = 248.15KJ/Kg, at evaporator entrance= 248.15kJ/kg, exit =338.14kJ/kg.