Your boss also asks you to solve this problem: R-134a enters the condenser of a residential heat pump at 800 kPa and 55°C at a rate of 0.018 kg/s and leaves at 750 kPa subcooled by 4°C. The R-134a enters the compressor at 200kPa superheated by 4°C. Construct a T-s diagram and evaluate; (i) the isentropic efficiency of the compressor; (ii) the rate of heat supplied to the heated room; (iii) the COP of the heat pump; and

Your boss also asks you to solve this problem: R-134a enters the condenser of a residential heat pump at 800 kPa and 55°C at a rate of 0.018 kg/s and leaves at 750 kPa subcooled by 4°C. The R-134a enters the compressor at 200kPa superheated by 4°C. Construct a T-s diagram and evaluate; (i) the isentropic efficiency of the compressor; (ii) the rate of heat supplied to the heated room; (iii) the COP of the heat pump; and

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

Related questions

Q: R134-a enters the condenser of a residential heat pump at 800 kPa and 40°C at a rate of 0.018 kg/s,…

A: Given Pressure, P = 800 kPa Mass flow rate, m = 0.018 kg/s Power, W = 1.2 kW Find COP…

Q: For a two-stage cascade system working on Carnot cycle and between low and high temperatures of…

Q: The working fluid of a liquid-vapor cycle is 1kg of R-134a. The cycle operates between two pressures…

A: Given data,(A) Table for temperature, pressure, enthalpy, volume,entropy and quality factor:…

Q: Steam is expanded in the high pressure stage of a turbine from 4000kPa, 360°℃ to 1000kPa with an…

A: The steam entering the high-pressure turbine is at P1=4000 kPa, T1=360°C. The isentropic efficiency…

Q: (7). In a gas turbine system air is taken into the compressor at 100kPa and 18°C. It is compressed…

Q: produce ice at a final temperature of - 10 degrees * C from water at 27 degrees * C . The compressor…

Q: Steam enters the turbine of a simple vapor power plant with a pressure of 10 MPa and temperature of…

A: GivenP1=10MPaT1=580oCP2=6kPa

Q: In a thermal power plant, steam is obtained from the boiler at 70 bar and 450 °C. This steam is…

A: For Solving The Problem Help Of Moiller Chart Has Taken. Note: Please Provide the properties of coal…

Q: A gas turbine draws in air at 98kPa and 27°C. It is adiabatically compressed to 600kPa in a…

A: “Since you have posted a question with multiple sub-parts, we will provide the solution only to the…

Q: Refrigerant 134-a enters the condenser of a residential heat pump at 800kPa and 35°C at a rate of…

A: Given: Saturation pressure of the condenser→Pc=800 KPa At this saturation pressure from the R134a…

Q: 1. A device with refrigerant-134a as the working fluid as illustrated in figure attached is used to…

A: Process 1-2s: Isentropic compression process,Process 1-2a: Actual compression process,Process 2-3:…

Q: A steam turbine with rated capacity of 42,000 kW (actual work produced) operates with steam at inlet…

Q: Consider a fully reversible cycle consisting of isentropic compression, isothermal heat addition,…

Q: A gas turbine for an automobile is designed with a regenerator. Air enters the compressor of this…

A: Given: Compressor inlet temperature T1=30∘C=303 k Maximum cycle temperature T4=800∘C=1073 k The…

Question

Your boss also asks you to solve this problem: R-134a enters the condenser of a
residential heat pump at 800 kPa and 55°C at a rate of 0.018 kg/s and leaves at 750
kPa subcooled by 4°C. The R-134a enters the compressor at 200kPa superheated
by 4°C. Construct a T-s diagram and evaluate;
(i)
the isentropic efficiency of the compressor;
(ii)
the rate of heat supplied to the heated room;
(iii)
the COP of the heat pump; and
(iv)
the COP and the rate of heat supplied to the heated room if this heat pump
operated on the ideal vapour compression cycle between the pressure limits
of 200 and 800 kPa.

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 3

VIEW

Step by step

Solved in 3 steps with 5 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

Consider a variation of the Carnot cycle in a closed system with 10 kg of pure water operating. ranging between temperatures of 130 C and 350 ◦C. State 1 is a saturated liquid. Process 1-2 is a isothermal expansion with a supply of QH = 10 MJ. Process 2-3 is an adiabatic expansion with isentropic efficiency from 0.75 to minimum temperature. Process 3-4 is a compression isothermal, and the 4-1 process is a reversible adiabatic compression. Calculate: a. The pressure p2, the bonds x4 and x3, and the specific entropies s1 and s3; b. The work in each expansion and compression process; c. The heat rejected QL, the net work produced Wl i q and the yield η of the cycle; d. The entropy generated Sg in the cycle
R134a enters the condenser of a residential heat pump at 850 kPa and 70°C at a rate of 0.020 kg/s and leaves at 750 kPa and 2°C. The refrigerant enters the compressor at 180 kPa and 8.0°C. Determine (a) the isentropic efficiency of the compressor (in %), (b) the rate of heat supplied to the heated room (in kW) and (c) the COP of the heat pump. Disregard any heat loss in the expansion valve and compressor as well as the change in potential and kinetic energy of the refrigerant in any part of the cycle.
Q5/ For a steam power plant, the turbine operates isentropically and adiabatically with inlet steam at 6800 kPa and 550 °C and the exhaust steam enters the condenser at 50 °C. Saturated liquid water leaves the condenser, and is pumped to the boiler. Neglecting pump work and kinetic and potential energy changes, determine the thermal efficiency of the cycle?
P
A vapor-compression cycle is used as a refrigerator to extract 8 kW of heat from a cold space at 0°C and rejects heat into a space at 25°C. R-134a enters the compressor at 140 kPa superheated by 4°C above the saturation temperature and leaves at 900 kPa. It exits the condensor as a saturated liquid. Assume that pressure losses are negligible and that the compressor is isentropic. Report your answers to four significant digits using rounding. QUESTION 1 Report the maximum possible COP. QUESTION 3 Report the power required by the compressor. QUESTION 2 Report the mass flow rate in kg/s. QUESTION 4 Report the COP for the cycle.
Refrigerant-134a at a rate of 0.08 kg/s enters the compressor of a refrigerator as superheated vapor at 0.18 MPa and 0 ℃ and leaves at 0.9 MPa and 80 ℃. The refrigerant is cooled in the condenser to 31.3 ℃ and 0.8 MPa and it is throttled to 0.18 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between the components, a) Show the cycle on a T-S diagram b) Determine the rate of heat removal from the refrigerated space and the power input to the compressor c) Determine the adiabatic efficiency of the compressor d) Determine the coefficient of performance of the refrigerator.
Consider the conditions of Problem 1, homework 5 (it is repeated below) and that the surroundings are at a temperature of 4 C. Instead of mixing the two fluids together consider the following proposal. Heat is allowed to flow from the 3 Kg mass of water through a Carnot heat engine and is rejected to the cooler mass which acts as the low temperature thermal reservoir. Determine the maximum amount of work that could be performed by the heat engine, the entropy produced, and the exergy destroyed in the 3 Kg mass during this operation. Also, determine the total entropy produced and exergy destroyed in the total system. In this case the temperature and internal energy of the mass of water is changing unlike the infinite heat reservoir case. Since the temperature of both the high temperature and low temperature heat input is changing, the Carnot efficiency is also changing. This problem should be solved using a numerical technique that you write using either excel or Matlab. In…