A refrigerator absorbs 5 kJ of energy from a cold reservoir and rejects 8 kJ to a hot reservoir. (a) Find the coefficient of performance of the refrigerator. (b) The refrigerator is reversible and is run backward as a heat engine between the same two reservoirs. What is its efficiency?

A refrigerator absorbs 5 kJ of energy from a cold reservoir and rejects 8 kJ to a hot reservoir. (a) Find the coefficient of performance of the refrigerator. (b) The refrigerator is reversible and is run backward as a heat engine between the same two reservoirs. What is its efficiency?

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter1: Energy Basics

Section: Chapter Questions

Problem 5P

See similar textbooks

Related questions

Q: A 1 lbm/s fluid enters a machine at 170 m/s. 800 kPa, and with a specific volume of 0.3 m³/kg. The…

A: Determine workdone by the fluid?

Q: A closed tank whose bottom is 45 cm in diameter is filled with three liquids: 30 cm of carbon…

Q: a. The velocity before the jump b. The depth after the jump c. The velocity after the jump d. The…

Q: 7. What is the potential energy of the 100-N block? 3 2 m Datum a. 50 J b. 100 J

A: Weight of the block = mg = 100 N . Height above datum = h =2 m . The potential energy depends upon…

Q: 3. The motor unit A is used to elevate the 300-kg cylinder at a constant rate of 2 m/s. If the power…

Q: Q3. A pump is required to pump water from a large reservoir to the water tower located 20 m above…

A: a) The expression for energy between velocity 1 and 2 is given as P1γ+V122g+z1+HP=P2γ+V222g+z2…

Q: A pump delivers water from a lower to a higher reservoir. The difference in elevation between the…

A: As fluid moves from a more extensive line to a smaller one, the volume of the liquid that moves a…

Q: A power nozzle throws a jet of water which is 30 mm in diameter at a velocity of 40 m/s. What is the…

A: Given data: Diameter of nozzle=30 mm Velocity=40 m/s It is asked to find the power exerted by…

Q: HW. For the figure below fined the temperature of the nodels 1 to 9. 2 cm h, T= 50°C 4 1 cm T= 300°C…

A: A Fourier transform system is a way of calculating points in a system area with the correct…

Q: A closed tank whose bottom is 45 cm in diameter is filled with three liquids: 30 cm of carbon…

Q: 1. A block of woods floats in water with 50 mm projecting above the water surface. When placed in…

A: Question 1: Given: Projection of wood in water=50 mmSpecific gravity of glycerin=1.35Projection of…

Q: Paolo owns a hydroelectric power generating system as shown in HG008. Water flows from an upper…

Q: 5 A8 kg mass is attached to a 2 m long spring. At equilibrium, the spring measures 2.1 m. The mass…

Q: A heat pump supplies heat energy to a house at the rate of 140,000 kJ/h when the house is maintained…

A: It is required to determine the maximum Coefficient Of Performance for air. We know that, 0oC = 273…

Q: Q.2. Air flows through a constant-area duct is connected to a reservoir at a temperature of 500°C…

A: Given T=500℃ P=500kpa Heat lost=250kj/kg D=0.02m

Q: Compute the number of watts which are equivalent to 1 horsepower. (1 watt = 10^7 cm-dynes per sec; 1…

A: 1HP=550 lb-ft per sec

Q: A 9.2-kg plastic tank that has a volume of 3.3 m3 is filled with liquid water. Assuming the density…

Q: certain fluid has an enthalpy 1800 KJ/kg and 500 KJ/kg work flow. Find the internal energy.

Q: Example -3.12- Two pipes, one carrying toluene of sp.gr. = 0.875, and the other carrying water are…

A: PA-0.875×1000×9.81×2.5=1.2×1000×9.81×2.5PA=50889.375Nmm-2

Q: Air at 1 atm and 20 C flows in a 2-cm-diameter tube. The maximum velocity (m/s) of air to keep the…

A: Reynolds numbers : In various fluid flow scenarios, the Reynolds number aids in the prediction of…

Q: Calculate the change in 5 m long copper wire when its temperature changes by 60∘C. State your…

Q: Question 2 b) Water flows from a large reservoir through a pipe system which consists of 200 mm…

Q: An engine absorbs 100 J and rejects 60 J in each cycle. (a) What is its efficiency? (b) If each…

A: Given: The energy absorbs by the engine is 100 J. The energy released by the engine is 60 J. The…

Q: A fluid flowing in a pipe 30 cm in diameter has a uniform velocity of 4 m/s. The pressure at the…

Q: 2. With an initial pressure of 30x105 Pa and constant operating temperature of 200°K in a 40 m³-tank…

A: Given data:- Initial pressure =30×105 Pa Operating temperature =200°K Volume of tank =40 m3 Length…

Q: Motor unit A is used to elevate the 300-kg, cylinder at a constant rate 2 m/s. If the power meter B…

A: Solution-The given values are as followsThe motor unit A is used at =300kgConstant rate =2m/sThe…

Q: Q3. A pump is required to pump water from a large reservoir to the water tower located 20 m above…

A: Given : z1 = 0 z2 = 20 P1 = 0 P2 = 0 hL = 0 D = 30 mm Q = 0.03 m3/s ρ=1000 kg/m3 V1 = 0 A)…

Q: My question is in this problem: A 3-m-diameter tank is initially filled with water 2 m above the…

Q: 6.0 g of cream at 13.2 °C are added to an insulated cup containing 150.0 g of coffee at 92.9 °C.…

Q: 3 A flocculation tank contains 1800 m³ of water, which is mixed using paddles at an average velocity…

A: Given data: Volume, V=180 m3 Velocity gradient, G=100s Viscosity, μ=0.798×10-3 Nsm2

Q: Determine the work done by an electric motor lifting an elevator weighing 4 kN through five floors;…

A: Given: Weight of lift, W = 4 kN = 4000 N Number of floors, n = 5 Distance between each floor, d = 3…

Q: 1. A 2,000 ft long PVC pipe of 12-in diameter carries 1.0 cfs of water. The "C" coefficient is…

A: Energy loss due to friction hf=10.65Q1.85C1.85×d4.87×LWhere; Q- dischrge in m3/sd-diameter in meterL…

Q: Q: The tank in Figure is closed at top and contains air at pressure PA. Calculate the value of PA of…

Q: A pump drawing water from a reservoir and discharging it into the atmosphere at point B. The…

Q: Example: For the system shown in Figure calculate the height H of the oil at which the rectangular…

Q: A nozzle of inner radius 1.06 mm is connected to a hose of inner radius 9.05 mm. The nozzle shoots…

Q: If a horizontal force of 890 N is developed by the water jet leaving the pipe on the 90° deflector…

A: Solution-The given values are as follows, Horizontal force(F)=890NEfficiency(η)=90%To DetermineThe…

Q: Power for Agitation and Scale-Up. A turbine agitator having six flat blades and a disk has a…

A: For the turbine power, you have to know the hydraulic power, which depends on the flow and the…

Q: A coal-fired power plant discharges 1 m^3/s of cooling water into a river, which has a flow of 9…

A: The temperature of the river before mixing is 20 oC and as per the regulation the temperature in the…

Q: A flocculation tank contains 1800 m³ of water, which is mixed using paddles at an average velocity…

A: Given data in question Volume Velocity gradient Temperature Dynamic viscosity To find out…

Q: The following information is given for n-pentane at 1 atm:boiling point = 36.20°C ΔHvap (36.20°C) =…

A: A type of elastic collision in which two objects of equal mass initially move in the same direction…

Q: Figure Q2(b) shows water at 25°C flows through a 60 mm diameter 30 m long galvanized iron pipe from…

A: given dia = 60mm l =30m power = 40kw efficency =80 % Q = 0.046 m^3/s to find the height difference…

Q: Oil (s.g.=.8) flows @ 25L/s, if the energy produced by the fluid is 10 determine the power produced…

Q: Discuss the truth or falsehood of the following statements: a) "The rate of change of the…

A: Given, statement (a): "The rate of change of the cross sectional area of the tub with respect to…

Q: An oil pump is drawing 18 kW of electric power while pumping oil with density 860 kg/m3 at a rate of…

Q: placed

A: statement (b) false

Q: 0/ A fire has been happened near a wall in a building, suppose the heat transfer ation in the wall…

Concept explainers

Thermal Processes

Some of the key areas where thermal processes find their application are:

Question

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Step 5

Trending now

This is a popular solution!

Step by step

Solved in 5 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

Calculate the temperature of 0.39 mole of Xenon gas that occupies 9850 millimeters under a pressure of 631 torr.
A certain fluid has an enthalpy 1800 KJ/kg and 500 KJ/kg work flow. Find the internal energy.
2. With an initial pressure of 30x105 Pa and constant operating temperature of 200°K in a 40 m³-tank containing ethylene and connected through a long pipe with a length of 1500 m and a diameter of 0.2 m to a reactor operating at atmospheric pressure. a. Calculate the volumetric flow in m3/s to the reactor when the valve is opened. b. Calculate the time needed to halve the pressure in the tank. c. Calculate the mass of gas discharged from the tank from the condition of b.
Which of the following statements is FALSE? a) Kerosene is lighter than water. b) If kerosene was placed in the U-tube first, it would have settled at the bottom. c) Kerosene and water will never mix. d) If water was replaced by a heavier liquid, the specific gravity of kerosene will remain the same.
3.5 kg of an ideal gas is heated at constant temperature from 15 m3 and 4.0 atm to 35 m3 at Determine the work done
Your answer is partially correct. An insulated Thermos contains 110 cm3 of hot coffee at 83.0°C. You put in a 15.0 g ice cube at its melting point to cool the coffee. By how many degrees has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it were pure water and neglect energy exchanges with the environment. The specific heat of water is 4186 J/kg-K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.00 g/cm³. Number i 20 Units C°
A flocculator tank has a volume of 2800 m³. The temperature of water in the tank is 15°C, and the average velocity gradient maintained in the tank is 100/s. The temperature of water is reduced to 5°C, but all other operating conditions including the power input are maintained as the same. The decrease in the average velocity gradient (in %) due to the reduction in water temperature is (round off to nearest integer). [Consider dynamic viscosity of water at 15°C and 5°C as 1.139 × 10-³ N-s/m² and 1.518 x10-3 N-s/m², respectively]
A power nozzle throws a jet of water which is 30 mm in diameter at a velocity of 40 m/s. What is the power exerted by the nozzle? Select one: O a. 80 hp O b. 30 hp O c. 20 hp O d. 50 hp
A nozzle is a device for increasing the velocity of a steadily flowing stream of fluid. At the inlet to a certain nozzle, the specific enthalpy of the fluid is 3320 kJ/kg and the velocity is 60 m/s. At the exit from the nozzle the specific enthalpy is 2530 kJ/kg. The nozzle is horizontal, and the heat supply, the heat loss, the work input, and the work output to or from the nozzle are all negligible. (a) Determine the velocity at the nozzle exit
Question 2 Lauren has worker bullding her house on a hot summer day. She prepares a drink for them by adding a certain amount of ice at 0.0 °C to 1.8 kg of tea, initially at 80°C. How much ice in kilograms does she need to get the iced tea to be at final temperature of 10C? The heat of fusion of ice is 333 kJ/kg, specific heat of ice is 2100 J/kg. "Cand that of tea is 4186 Jkg. C 1.0 kg 15 kg O 12 kg
A 9.00-mol sample of H₂ gas is contained in the left side of the container shown below, which has equal volumes on the left and right. The right side is evacuated. When the valve is opened, the gas streams into the right side. H₂ Valve Vacuum (a) What is the entropy change of the gas? J/K (b) Does the temperature of the gas change? Assume the container is so large that the hydrogen behaves as an ideal gas. The temperature decreases. O The temperature increases. The temperature does not change. ✓
Prob-3 A cyclic machine, shown in Fig. below receives 300 kJ from a 1000 K energy reservoir. It rejects 125 kJ to a 400 K energy reservoir and the cycle produces 200 kJ of work as output. Is this cycle reversible, irreversible, or impossible? TH= 1000 K HE Q..=300 kJ H W 200 kJ = 19₂² 125 kJ TL=400 K