Estimate the maximum coefficient of performance

Assignment Help Chemical Engineering
Reference no: EM131155968

Example 6.21: Household Refrigerator

Estimate the maximum coefficient of performance of a household refrigerator.

Example 6.22: Ammonia Refrigerator

Design a vapor compression cycle using ammonia as the refrigerant that will be used to maintain the temperature of a stream at - 20 °C. The evaporator is air cooled and the ambient temperature may be assumed to be 25 °C. Assume a compressor efficiency of 80% and allow for 2 °C of temperature difference between streams in the evaporator and condenser for practical heat transfer.

Reference no: EM131155968

Questions Cloud

What is the implied discount rate : If the future value of an annuity due is $25,000 and $24,000 is the future value of an ordinary annuity that is otherwise similar to the annuity due, what is the implied discount rate?
Determine the heat load and the entropy generation : The steam in the previous example is cooled using water at 1 bar, 25 °C. The cooling water emerges at 40 °C at the exit of the heat exchanger. Determine the heat load and the entropy generation. Compare the result with the previous example.
Calculate the present value : calculate the present value of this security. Use the constant growth model to find the stock value.- Determine the value of the stock using the new dividend and required return from part b.
Perform the energy and entropy balances : The precooler uses cold vapor from the separator as the cooling medium; this vapor leaves the precooler at 20 °C (stream). Perform the energy and entropy balances on the basis of 1 kg/s of liquid nitrogen produced.
Estimate the maximum coefficient of performance : Design a vapor compression cycle using ammonia as the refrigerant that will be used to maintain the temperature of a stream at - 20 °C. The evaporator is air cooled and the ambient temperature may be assumed to be 25 °C. Assume a compressor effici..
Determine which method is thermodynamically more efficient : In the process of Example 6.2, the flow rte of streams 1′ and 2′ is made very high, while the state of streams 1, 2, and 1′ are the same as in the previous example. Repeat the calculation of entropy generation for these new conditions.
Calculate the entropy of propane at its critical point : A member of our engineering team objects that the reference state is not valid because a substance is not ideal at the critical point. What is your response?
Draw an appropriate er diagram : Draw an appropriate ER diagram - Use the symbols as prescribed in your course-textbook to draw the ER diagram (ERD) for the above case study.
Are they able to climb in and out of a tub : Dressing. Are there any difficulties with gross movements such as pulling on clothes, or fine motor movements, such as buttoning, or tying shoes? With reaching over the head, such as when brushing the hair?

Reviews

Write a Review

Chemical Engineering Questions & Answers

  Calculate the tower diameter and packing height

Calculate the tower diameter and packing height and calculate NTU - Ammonia in air being absorbed by a pure water stream in a packed tower.

  What is the other product resulting from the decay

Seaborg, discoverer of the transuranium elements. a. 263Sg was produced by the bombardment of 249Cf with a beam of 18O nuclei. Complete and balance an equation for this reaction. b. 263Sg decays by  emission. What is the other product resulting f..

  Calculate the pxy graph for this system at 80 °c

Calculate the chemical potential of methanol in solution with acetic acid at xMeOH = 0.8, 80 °C, 0.4 bar. The reference state is the pure liquid at 80 °C, 0.4 bar. How is your answer affected by the fact that methanol is in the vapor phase at 80..

  Combusted in a constant-volume

Combustion of table sugar produces CO2(g) and H2O(l). When 1.46 g of table sugar is combusted in a constant-volume (bomb) calorimeter, 24.00 kJ of heat is liberated.

  Evaluate the temperature and conduction heat rate

Temperature variations are small over the shaft cross section. Evaluate the temperature and conduction heat rate at the shaft-pipeline joint (x = 0) and at the shaft-ground interface (x = 1 m)

  Describe how these limestone objects are corroded by the

when sulfuric acid is a component of polluted air it chemically attacks statues memorials and monuments made from

  Determine the acceleration potential

Determine the acceleration potential (in Volts) that must be applied to electrons so that in an electron diffraction experiment of {200} planes of silver, Ag, they will result in first order diffraction at 2?

  Illustrate the operation of demodulator

Show that the instantaneous frequency of the input FM signals is proportional to the number of zero crossings in the time interval t - (T1/2) to t + (T1/2), divided by T1, Assume that the modulating is essentially constant during this time interva..

  Fabry-perot interferometer that performs worse

In general, when is a Fabry-Perot interferometer preferred over a standard Michelson interferometer? Can you make a Fabry-Perot interferometer that performs worse than a Michelson interferometer? Explain.

  Draw t-s diagram of the cycle

Draw T-S diagram of the cycle.

  How the specific volume of each liquid varies with temp

Using the information in the above table to show how the specific volume of each liquid varies with temperature.   You should plot a graph for each liquid and use this graph to estimate the exact value of a at 50°C for each liquid.

  Compare macrs depreciation and straight-line depreciation

Compare MACRS depreciation and straight-line depreciation: based solely on the tax effects, which depreciation method (SL or MACRS) would yield a higher net present value for the project?

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd