A thermal wheel is used to recover energy from the extract air leaving a building at...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
A thermal wheel is used to recover energy from the extract air leaving a building at 5 kg/s mass flow rate and 23 °C dry bulb temperature. The heat is used to preheat the fresh air supply coming in at 5.5 kg/s and temperature of 12 °C. The thermal wheel speed is 20 rev/ min. (a) Draw a schematic of a typical thermal wheel with the temperature distribution of the air across the wheel - assume counter flow. (20%) (b) Using the data below calculate; i. ii. iii. The effectiveness of the matrix wheel. The rate of actual heat recovery. The temperatures of the air leaving the wheel. |(40%) (10%) (10%) c) Calculate the temperature of the air leaving the wheel if the speed is increased to 25 revs/min. (20%) Data Assume mass of the thermal wheel is 25 kg Specific heat capacity of Air, cp air = 1.005 kJ/kg-K Specific heat capacity of Matrix, Cp matrix = 0.4 kJ/kg-K Heat transfer coefficient for extract air stream = 20 W/m²-K Heat transfer coefficient for supply air stream = 25 W/m²-K Face area for the wheel = 1.2 m² Width of the wheel = 0.2 m Assume the matrix has a surface area to volume ratio of 3200 m²/m³ A thermal wheel is used to recover energy from the extract air leaving a building at 5 kg/s mass flow rate and 23 °C dry bulb temperature. The heat is used to preheat the fresh air supply coming in at 5.5 kg/s and temperature of 12 °C. The thermal wheel speed is 20 rev/ min. (a) Draw a schematic of a typical thermal wheel with the temperature distribution of the air across the wheel - assume counter flow. (20%) (b) Using the data below calculate; i. ii. iii. The effectiveness of the matrix wheel. The rate of actual heat recovery. The temperatures of the air leaving the wheel. |(40%) (10%) (10%) c) Calculate the temperature of the air leaving the wheel if the speed is increased to 25 revs/min. (20%) Data Assume mass of the thermal wheel is 25 kg Specific heat capacity of Air, cp air = 1.005 kJ/kg-K Specific heat capacity of Matrix, Cp matrix = 0.4 kJ/kg-K Heat transfer coefficient for extract air stream = 20 W/m²-K Heat transfer coefficient for supply air stream = 25 W/m²-K Face area for the wheel = 1.2 m² Width of the wheel = 0.2 m Assume the matrix has a surface area to volume ratio of 3200 m²/m³
Expert Answer:
Related Book For
Essentials of Federal Taxation 2019
ISBN: 9781260190045
10th edition
Authors: Brian Spilker, Benjamin Ayers, John Robinson, Edmund Outslay, Ronald Worsham, John Barrick, Connie Weaver
Posted Date:
Students also viewed these operating system questions
-
During one month, 45 preflight inspections were performed on an airplane at Southstar Airlines. 15 nonconformances were noted. Each inspection checks 50 items. Assuming 2 sigma off-centering, what...
-
Ken is 63 years old and unmarried. He retired at age 55 when he sold his business, Understock.com. Though Ken is retired, he is still very active. Ken reported the following financial information...
-
The following information applies to the questions displayed below Juan Diego began the year with a tax basis in his partnership interest of $50,000 During the year, he was allocated $20,000 of...
-
Windy Company manufactures surfboard bags in a one-department process: Design and Manufacturing. The Design and Manufacturing Department uses weighted-average costing method. The following tables...
-
-2/3 + (-5/6) Find the sum by hand.
-
Let andconsider the Trapezoid Rule (T(n)) and the Midpoint Rule (M(n)) approximations to I. a. Compute T(6) and M(6). b. Compute T(12) and M(12). 1 = Sox dx = 9
-
The records of Anderson Inc. provide the following information for the tax year 2020. - There was no beginning balance in deferred tax account(s). - Taxable income for 2020 was \(\$ 60,000\). - Tax...
-
Latona Hardware Store completed the following merchandising transactions in the month of May. At the beginning of May, the ledger of Latona showed Cash of $5,000 and Owners Capital of $5,000. May 1...
-
This is a Question in the Advanced Accounting Book, which i need a tutor's help to solve to prepare for my exam. GROUP REPORTING IL APPLICATION OF THE ACQUISITION METHOD UNDER IFRS 3 151 P3.2...
-
The Specialty Department Stores, Inc. chief executive officer (CEO) has asked you to compare the company's profit performance and financial position with the averages for the industry. The CEO has...
-
The file P12_16.xlsx contains the daily closing prices ofAmerican Express stock for an eight-week period. Use the randomwalk model to forecast the closing price of this stock on the nexttrading day 0...
-
Identify three items that decrease retained earnings.
-
The role of analytical procedures relative to tests of details may be greater for income statement accounts than balance sheet accounts. Why?
-
Identify several differences in preparing audit programs for initial engagements versus recurring engagements.
-
a. What are the auditor's objectives in auditing related party transactions? b. Identify the substantive tests that may be used in auditing related party transactions.
-
What are irregular items and what effect might they have on the estimation of future profits and future cash flows?
-
Dehner Corporation uses a job-order costing system with a singleplantwide predetermined overhead rate based on direct labor-hours.The company based its predetermined overhead rate for the currentye 2...
-
You are thinking of investing in one of two companies. In one annual report, the auditors opinion states that the financial statements were prepared in accordance with generally accepted accounting...
-
Would a corporation with a small amount of currentyear taxable income (before the net operating loss deduction) and a large net operating loss carryover have a tax liability for the current year?...
-
Sarah was contemplating making a contribution to her traditional individual retirement account for 2018. She determined that she would contribute $5,000 to her IRA and she deducted $5,000 for the...
-
Describe how purchased goodwill leads to temporary booktax differences.
-
Thirty-four percent of U.S. college graduates work in jobs that do not require a college degree. You randomly select 20 U.S. college graduates. Find the probability that the number working in a job...
-
Find the probability that the number who feel they have little or no control over data collected about them by companies is (a) at most 200, (b) less than 210 , and (c) exactly 202 . Identify any...
-
A survey of U.S. adults found that 72% used a mobile device to manage their bank account at least once in the previous month. You randomly select 70 U.S. adults and ask whether they used a mobile...
Study smarter with the SolutionInn App