(a) A refrigeration system using R134a as refrigerant is operating at the temperature settings of minus...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
(a) A refrigeration system using R134a as refrigerant is operating at the temperature settings of minus 20°C and 40°C. Plot the refrigeration on the PH Diagram provided. Given that the Power input to the compressor is 100W, estimate the capacity of cooling in term of Watt (25%) (W). (b) If the refrigerant of the system is changed from R134a to R410a with other parameters remain unchanged, what would be the difference between the two refrigerants in term of Coefficient of Cooling? (25%) (c) A centralized air-conditioning system adopts a 20/80 approach on mixing fresh air and return air. Given that general outdoor conditions in 32°C Dry Bulb Temperature (DB) and 80% Relative Humidity (RH) and the return air being 25°C DB and 50% RH. Identify the state of the mixed air through the psychrometric chart. (25%) (d) The mixed air will then pass through the cooling coil and the conditioned air will enter indoor area at 15°C and 90% RH. Plot the cooling process on the psychrometric chart and calculate the capacity of the cooling coil per unit weight. (25%) (a) A refrigeration system using R134a as refrigerant is operating at the temperature settings of minus 20°C and 40°C. Plot the refrigeration on the PH Diagram provided. Given that the Power input to the compressor is 100W, estimate the capacity of cooling in term of Watt (25%) (W). (b) If the refrigerant of the system is changed from R134a to R410a with other parameters remain unchanged, what would be the difference between the two refrigerants in term of Coefficient of Cooling? (25%) (c) A centralized air-conditioning system adopts a 20/80 approach on mixing fresh air and return air. Given that general outdoor conditions in 32°C Dry Bulb Temperature (DB) and 80% Relative Humidity (RH) and the return air being 25°C DB and 50% RH. Identify the state of the mixed air through the psychrometric chart. (25%) (d) The mixed air will then pass through the cooling coil and the conditioned air will enter indoor area at 15°C and 90% RH. Plot the cooling process on the psychrometric chart and calculate the capacity of the cooling coil per unit weight. (25%)
Expert Answer:
Answer rating: 100% (QA)
a Given Refrigerant R134a Evaporator Temperature Te 20C Condenser Temperature Tc 40C Power input to ... View the full answer
Related Book For
Thermodynamics An Engineering Approach
ISBN: 978-0073398174
8th edition
Authors: Yunus A. Cengel, Michael A. Boles
Posted Date:
Students also viewed these mechanical engineering questions
-
What would be the difference between an attributes sampling plan and a variables sampling plan in a test of inventory extensions?
-
A gas refrigeration system using air as the working fluid has a pressure ratio of 4. Air enters the compressor at -7C. The high-pressure air is cooled to 27C by rejecting heat to the surroundings. It...
-
A gas refrigeration system using air as the working fluid has a pressure ratio of 5. Air enters the compressor at 0°C. The high-pressure air is cooled to 35°C by rejecting heat to the...
-
Prove that the curves y 2 = 4x and x 2 = 4y divide the by of the squre bounded by x = 0, x = 4, y = 4 and y = 0 into three equal parts.
-
A textile manufacturer wants to set up a control chart for irregularities (e.g. oil stains, shop soil, loose threads, and tears) per 100 square yards of carpet. The following data were collected from...
-
You are designing a new syntax for a programming language like Java, with the intention of making it more approachable to students by using English words instead of punctuation symbols. (a) How does...
-
Top managers of Bernard Associates are reviewing company perfor- mance for 2009. The income statement reports a 15% increase in net income, which is outstanding. The balance sheet shows modest...
-
Which function is normally responsible for sales volume variances? a. marketing b. administration c. production d. top management
-
Using equal amounts of resources, the city of Cliffordland can produce 10 cars of 10 trucks, whereas the city of Econberg can produce 4 cars or 8 trucks. 1. Which country has the absolute advantage...
-
It is now January 2018. The year 2017 finished well. The finalized year-end financial statements for 2017 are provided in the excel file associated with this assignment. Randolf and Tenisa at Comfy...
-
What is your insights about this?? COLLEGE VISION The College of Business Administration is envisioned to enhance the quality of life of a diverse population of students by enabling them to become...
-
Assume you prepay Body Studio for a package of six physical training sessions. Which type of account should you have in your records? a. Prepaid expense b. Accrued expense c. Accrued revenue d....
-
Unearned revenue is always a (an) a. Asset b. Revenue c. Liability d. Owner's equity because you collected the cash in advance
-
For a test about the population mean, the power of a test depends on a specified value that satisfies the alternate hypothesis. In Exercises 68, determine whether the statement is true or false. If...
-
The power is the probability of making a Type I error. In Exercises 68, determine whether the statement is true or false. If the statement is false, rewrite it as a true statement.
-
Once the significance level ???? has been chosen, the only way to increase the power of a test is to decrease the sample size. In Exercises 68, determine whether the statement is true or false. If...
-
Labor Total Product Marginal Product 4 110 5 115 6 122 7 127 8 130 9 132 10 133 Output TC TVC TFC MC ATC AVC AFC 0 30 1 35 2 60 3 110 4 200 5 320 6 600 Complete the following table
-
The polar coordinates of a point are given. Find the rectangular coordinates of the point. (-1, - /3)
-
Carbon dioxide enters an adiabatic compressor at 100 kPa and 300 K at a rate of 1.8 kg/s and exits at 600 kPa and 450 K. Neglecting the kinetic energy changes, determine the isentropic efficiency of...
-
Somebody claims that oxygen gas at 160 K and 3 MPa can be treated as an ideal gas with an error of less than 10 percent. Is this claim valid?
-
Two concentrating collectors (collector A and collector B) have the same concentration factor of CR = 7 and the optical efficiency of ar = 0.88. The collector temperature for both collectors is 145oC...
-
The gross profit ratio is equal to: (a) profit divided by net sales. (b) cost of sales divided by net sales. (c) net sales minus cost of sales, divided by net sales. (d) net sales minus cost of...
-
What inventory cost flow method does Dominos Pizza Enterprises Ltd use for its inventories?
-
Which inventory cost flow method produces the highest profit in a period of rising prices?
Study smarter with the SolutionInn App