Example 3 A house requires 2 x 105 kJ/h for heating in winter. Heat pump is used to absorb heat from cold air outside in winter and send heat to the house. Work required to operate the heat pump is 3 x 104 kJ/h. Determine : (i) Heat abstracted from outside ; (ii) Co-efficient of performance.

Example 3 A house requires 2 x 105 kJ/h for heating in winter. Heat pump is used to absorb heat from cold air outside in winter and send heat to the house. Work required to operate the heat pump is 3 x 104 kJ/h. Determine : (i) Heat abstracted from outside ; (ii) Co-efficient of performance.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.46P

See similar textbooks

Related questions

Q: The crate, which has a mass of 180 kg If it is originally at rest, determine the distance it slides…

Q: find area between line y=-2+x and y=x^(1/2) and x-axis

Q: • A stone is thrown horizontally at +17 m/s from the top of a cliff 40 m high. How long does the…

Q: Air enters a compressor at a mass flow rate of 0.04 kg/s with a stagnation pressure of 100 kPa and a…

Q: 0.00 19.00 kN-m Moment diagram I₂ = 22×106 mm* Beam section y 10.00 -26.00 kN-m 100.00 mm 200.00 mm…

Q: Q1: A gas turbine power plant operating on an ideal Brayton cycle has a pressure ratio of 8. The gas…

Q: 1) Two parallel black plates 2 by 1.0 m are spaced 0.1 m apart. One plate is maintained at 800 C and…

A: When two large parallel surfaces at temperatures T1 and T2T1>T2 and emissivities ε1 and ε2 are…

Q: Q₁:- In figure. 1 v = (25 s-0.15s¹) m/s, compute car's acceleration at B, where s = 54 m, X= 50m…

A: Find , Acceleration at B

Q: b. Draw the free body diagram of bar BC of the plane structure and determine the internal loads…

Q: Differentiate between ductile and brittle fracture in materials. Discuss the importance of ductile…

A: Difference Between Ductile and Brittle Fracture in Materials Ductile Fracture Brittle Fracture…

Q: ..s) The beam shown is fixed at A and to be supported by rod BC at B. The beam carries a uniform…

Q: Q1 A Carnot refrigeration cycle absorbs heat at -8°C and rejects heat at 55°C. (a) If the heat…

Q: Two balls A and B, having a mass of 600 g and 1 kg, respectively, collide with the velocities shown…

A: given data mass of ball A = 600 g mass of ball B = 1 kg e = 0.8

Q: Q.6 A vapor compression cycle uses R134a as the refrigerant. The vapor condenses at 40°C and is…

Q: m weight of 80N and rests against the wall at B.If the coefficient of 4, determine the smallest…

Q: Question Block A and B are homogeneous with 20 kg and 25 Kg mass respectively. The system is…

Q: Q2/ find the outcome of the cove -Q2/ find the outcome of the convergent forces system in the figure…

Q: Given: Time, t (s) 0 Position, x (m) 0 Using Centered-Finite Difference Method, find: find the…

A: as per the central difference method we know that f'(xi)=f(xi+1)-f(xi-1)2hh = step difference

Q: Find the steady state response xss(t) K(+) etter torg min FIND 40kg/s 2 7 m F(t) = 60SIN (40+) THE…

Q: Example 3 300 N 3 4 400 N P Q/ The figure above is in equilibrium find the value of the angle and…

Q: A study of the physical characteristic of honey was conducted due to the large demand of royal…

Q: If the value of Reynolds number is less than 2000 the flow is called ...................flow steady…

Q: A vented tanker is to be filled with fuel oil with Density= 920 kg/m3 and Viscosity =0.045 kg/m s…

Q: A trough has congruent triangular ends of top base 4 ft and height at the center of 1 ft. If the…

A: Given: The height of the trough→h=1 ft length of the top base→l=4 ft Let w is the specific weight…

Q: Homework: For the element shown find 1) Principle stresses and their direction 2) Shear stresses and…

A: find a)the principal stress and direction b) the shear stress and direction

Q: Q1-In the figure given below calculate the of (H) for the given data:

Q: The wall shear stress in fully developed flowportion of a 30 cm diameter pipe carrying water is…

A: we have to figure out pressure gradient

Q: For a Diesel cycle, the temp. and pressure at the beginning of compression are: T=27°C P=180 kPa.…

Q: An ideal refrigeration cycle that has a condenser temperature of 25°C and an evaporator temperature…

A: following is the solution to the above question-

Q: Q.2. Determine the moment of inertia of the composite area about the x and y axis. 150 mm -150 mm--…

Q: O F=300 M P: 400 N

Q: Convert 104KPa to meters of H2O @ d= 15mm = 225psi to inches Hg in a pipe of circumference =…

A: INTRODUCTION: Unit conversion is the use of particular terminology to express values. The defined…

Q: An open tank contains water upto a depth of 2 m and above it an oil of specific gravity 0.8 for a…

A: We know that an open tank contains water upto a depth of 2 m and above it an oil of specific geavity…

Q: A particle which moves with curvilinear motion has coordinates in meters which vary with the time t…

Q: 24. 1.6 kg/min of saturated steam at 2.86 mpa undergoes a p=c process until its temperature become…

Q: A solid prismatic rod is L₁ = 330 mm long and has a circular cross section with a diameter of d = 24…

A: GivenLi=330mmd=24mmLf=330.265mm

Q: If the ultimate strength of a steel rotating-beam test specimen was around 1600 MPa. Estimate the…

Q: Draw how it look if it is a turbulent flow in pipe.

Q: A 20 k B 20 k C 20 k 20 k D G 80 k LBR 80 k 8 ft 8 ft LOR 1 8 ft 8 ft 8 ft Find Reaction in points A…

A: First Calculate the reactions, And then use method of joint and method of section method to solve…

Q: Refrigerant 134a enters the condenser of arefrigeration cycle at Sookpa and bod with a flow rate of…

Q: A pipe with diameter 30 cm carries oil of sp.gr. 0.95 at a velocity of 4 m/s .at another section the…

Q: A uniform circular thin rod of radius 10 in. is attached to a pin at C and to the cable AB. Find the…

Q: Q4) Why do we need orthotropic analysis for composite laminates?

A: given; Q4) Why do we need orthotropic analysis for composite laminates?

Q: When the flywheel rotates 20 revolutions, it achieves an angular velocity of wf = 30 rad/s, starting…

A: Given: Final angular velocity = 30 rad/s Initial angular velocity = 15 rad/s Revolution = 20

Q: Q2/ An ideal gas, Cp= (2) R and Cv=R, undergoes the following mechanically reversible changes in…

Q: For the connection shown in the figure, determine the average shear stress (psi) produced in the…

A: ◆ The average shear stress produced in each of the bolt is 5660 psi. ◆ Therefore, option (b) is…

Q: Extensive property of a system is one whose value *

A: Their are two property : Intensive Extensive Extensive property are those which changes with amount…

Q: 11) In water jet cutting and abrasive water jet cutting, the separation between the nozzle opening…

A: As per bartleby guidelines we are allowed to solve only 1st 3 subparts if multiple subparts are…

Q: 10. At the instant shown the boomerang has an angular velocity w = 4 rad/s and its mass center G has…

A: given data Vg= 6 in/se w= 4 rad /se find the velocity of point B.

Q: The boiling temperature of water decreases by about 3°C for each 1000-m rise in altitude. What is…

Concept explainers

Fire safety

Fire safety is a new domain emerged in the early 90s to enable the design of buildings, structures, and infrastructure against destruction through fire. It also includes the provisions of building codes. This field is mostly associated with the design and efficient planning of a building, to reduce the destruction caused by fire. The branch of engineering that deals with it for the safety of the buildings from destruction of fire, is known as fire safety engineering.

Question

I need answer within 20 minutes please please with my best wishes

Example 3
A house requires 2 x 105 kJ/h for heating in winter. Heat pump is used to absorb heat
from cold air outside in winter and send heat to the house. Work required to operate the
heat pump is 3 x 10 kJ/h. Determine :
(i) Heat abstracted from outside;
(ii) Co-efficient of performance.

Expert Solution

This question has been solved!

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

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 2 images

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, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

Q3/ A refrigeration unit is cooling a space to −5°C by rejecting energy to the atmosphere at 20°C. It is desired to reduce the temperature in the refrigerated space to −25°C. Calculate the minimum percentage increase in work required, by assuming a Carnot refrigerator, for the same amount of energy removed.
What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0ºC and a cold reservoir temperature of −20.0ºC? (b) How much heat transfer occurs into the warm environment if 3.60 × 107 J of work (10.0 kW · h) is put into it? (c) If the cost of this work input is 10.0 cents/kW · h, how does its cost compare with the direct heat transfer achieved by burning natural gas at a cost of 85.0 cents per therm. (A therm is a common unit of energy for natural gas and equals 1.055 × 108 J.)
PROBLEM 2A household refrigerator has a coefficient of performance of 3 and requires a net powerinput of 0.8 kW. Question:(a) Determine the rate of heat transfer removed from the refrigerated space.(b) Determine the rate of heat transfer discharged from the refrigerator to thesurrounding kitchen.(c) Determine the annual cost in $ for supplying power to the refrigerator assuming24/7 operation and a cost of 12 cents per kWh.
Estimate the annual operating cost for a heat pump that delivers 30,000 BTU per hour of heat during winter and a similar rate of cooling during summer. Assume the heat pump operates 8 hours per day for 120 days in summer, and 12 hours per day for 120 days in winter. The Seasonal Energy Efficiency Ratio (SEER) for summer cooling is 16 BTU/Wh, and the Heating Season Performance Factor (HSPF) for winter heating is 12 BTU/Wh. The cost of electricity is $0.20/kWh.
A heat engine operates on the Carnot cycle, and has a thermal efficiency of 75 percent. The waste heat from this machine is rejected to a nearby lake at 15 ° C at the rate of 14 kW. Determine the power output of the motor and the temperature of the source, in ° C.
It is claimed that a certain cyclical heat engine operates between the temperatures of TH = 448°C and TC = 155°C and performs W = 3.98 MJ of work on a heat input of QH = 4.97 MJ. a. How much heat, in megajoules, would be discharged into the low-temperature reservoir? b. Which choice, by itself, is unreasonable about the claim? 1. The efficiency is greater than the Carnot efficiency for the stated temperatures 2. The work performed is less than the heat input. 3. The temperature difference is greater than 273.15 K. 4. All of these. 5. None of these
A heat pump is absorbing heat from the cold outdoors at 5 degrees celsius and supplying heat to a house at 22 degrees celsius at a rate of 18,000kJ/h. If the power consumed by the heat pump is 2.5kW, the coefficient of performance of the heat pump is?
An inventor claims to have devised a refrigeration cycle operating between hot and cold reservoirs at 308 K and 278 K, respectively, that removes an amount of energy QC by heat transfer from the cold reservoir that is a multiple of the net work input—that is, QC = NWcycle, where all quantities are positive. Determine the maximum theoretical value of the number N for any such cycle.
A Carnot heat engine, shown in Fig. 6–47, receives 500 kJ of heat per cycle from a high-temperature source at 652°C and rejects heat to a low-temperature sink at 30°C. Determine the thermal efficiency of this Carnot engine.
A heat engine is operating on a Carnot cycle and has a thermal efficiency of 55 percent. The waste heat from this engine is rejected to a nearby lake at 60°C at a rate of 900 kJ/min. Determine the temperature of the source.
14. Calculate the net work output of a heat engine following path ABCDA in the figure below.
A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa. The mass flow rate of the refrigerant is 0.05 kg/s. Determine:a) the rate of heat removal from the refrigerated space (kW),b)the power input to the compressor (kW),c) the rate of heat rejection to the environment (kW), andd) the coefficient of performance.Submit your solution by multiplying (a)*(b)*(c)*(d) = _________.