test-01-335-615-Spring-2024

.pdf

School

Texas A&M University *

*We aren’t endorsed by this school

Course

335

Subject

Mechanical Engineering

Date

Apr 3, 2024

Type

pdf

Pages

5

Uploaded by ConstableSalamanderMaster962 on coursehero.com

NAME _____________________ __________ Take Home Test #1, page 1 ARCH 335 / 615, Spring 2024, Prof. J.Haberl DO YOUR OWN WORK! ARCH 335 / 615 - ENVIRONMENTAL SYSTEMS TAKE HOME TEST #1 THIS TEST IS AN OPEN BOOK, OPEN NOTE, TAKE HOME TEST. YOU ARE EXPECTED TO USE YOUR NOTES FROM CLASS AND THE COURSE TEXT BOOK. DO YOUR OWN WORK. DO NOT CONSULT WITH OTHERS ABOUT YOUR ANSWER BEFORE YOU TURN IN YOUR TEST. FILL-IN ONLY (1) ONE ANSWER FOR EACH OF THE QUESTIONS. DO NOT FILL-IN MORE THAN (1) ONE ANSWER FOR A QUESTION. IF TWO ANSWERS APPEAR TO BE CORRECT, CHOOSE ONLY ONE (1) OF THE ANSWERS. NOTE: Use of CHATGPT on a previous 335 test gave 19/30 correct answers, which is a “D” . Therefore, do not rely on CHATGPT or any other generative AI tool to give you correct answers. 1. Use the spreadsheet for Test #1 to indicate your answers. Cells colored yellow require your response 2. Fill-in your ""name"" and ""e-mail"" in the yellow Box. 3. Fill-in the answers for Question #1 "Q1", "Q2" ... "Q30" ... and submit this excel file to the grader for 335 / 615: 4. Use email subject and file headers as: ""ARCH335 'Your Name' Test 1"" 5. Due date for Test #1 submission is Tuesday, February 22 nd , 2022 before class. ANSWERS WILL BE POSTED AFTER THE TEST IS GRADED. 1. Your friend in England calls you and says to come and visit in the summer, saying that the average annual temperature is 281 o K (your friend has always been a little different). You tell him that you’ve love to visit, since you love it when it is ____ outside. A. 13 o C B. 58 o F C. 289 o K D. 8 o C E. 65 o F 2. Convert the 0.5 gal/min to ??? ml/sec. A. 315.6 ml/sec B. 3.156 ml/sec C. 31.56 ml/sec D. 3,156 ml/sec E. 0.3156 ml/sec 3. Willis Carrier was an American engineer who is best known for inventing modern air-conditioning. He also developed the formula for analyzing moist air that led to today’s psychrometric chart. Which of the following are true about Mr. Carrier: 1. He was working for Buffalo Forge company at the time he published his equations. 2. He presented his findings at the annual meeting of the American Society of Heating, Refrigeration and Air-Conditioning Engineers. 3. He founded the Carrier company to manufacturer HVAC systems. A. 1 and 2 above B. 2 and 3 above C. 1 and 3 above D. All of the above E. None of the above 4 . The correct definition of “specific humidity” is: A. Measure of the moisture in moist air as a percentage of the saturated air. B. Measure of the moisture in moist air expressed in (lb-moisture/ft 3 -air). C. Measure of the moisture in moist air expressed as a ratio of the liquid moisture to the vaporized moisture (lb/lb). D. Measure of the moisture in moist air as a ratio of the moisture to the dry air (lb/lb). E. Measure of the moisture in moist air expressed as a relative amount compared to saturated air (%).
NAME _____________________ __________ Take Home Test #1, page 2 ARCH 335 / 615, Spring 2024, Prof. J.Haberl DO YOUR OWN WORK! 5. If 500 CFM of outside air at sea level, at 100 Tdrybulb and 50% RH is mixed with 1,500 CFM of return air at 80F Tdrybulb and 50% RH, find the best pair of values that describe the mixed air: A. Tdrybulb = 85 F, Twetbulb = 65F. B. Twetbulb = 71 F., Specific humidity = 0.00134 lbm/lba. C. Tdewpoint = 65 F, Tdrybulb = 71F. D. Twetbulb = 71 F, Tdewpoint = 65 F. E. Tdrybulb = 58 F, specific humidity = 0.0134 lbm/lba. 6. Why does the ASHRAE thermal comfort chart have a ‘winter’ and ‘summer’ range? A. To account for the differences in the weather conditions. B. To account for the differences in the metabolic rates. C. To account for differences in skin exposure. D. To account for the differences in the clothing. E. None of the above 7. According to the U.S. Energy Information Agency (EIA) the United States used approximately 30 quadrillion Btu in 1950. By 2018 this amount had risen to almost 101+ quadrillion Btu. In 2020 the largest energy source for the U.S. was: A. Petroleum B. Natural gas C. Coal D. Nuclear E. Other (wind, biofuels, hydro, other) 8. In 2020, according the the LLNL energy flow chart, if the United States was to supply all their energy from non-fossil fuel sources how much would these sources need to expand to meet all the U.S. energy needs? A. 2.0 times B. 2.5 times C. 3.0 times D. 3.5 times (Questions #9 - 12) Moist, sea level air at Tdrybulb = 90 F and 60% RH is passed through a cooling coil and exits the cooling coil at Tdrybulb = 12.77 C and 100% RH. 9. How much sensible cooling takes place (Btu/lb)? A. 10.2 Btu/lb B. 8.8 Btu/lb C. 7.2 Btu/lb D. 12.2 Btu/lb E. 5.2 Btu/lb 10. How much latent cooling takes place (Btu/lb)? A. 10.2 Btu/lb B. 7.2 Btu/lb C. 12.2 Btu/lb D. 5.2 Btu/lb E. 8.8 Btu/lb 11. How much water is removed is 10,000 CFM enters the coil? A. 38.74 lb/hr B. 985.6 oz/min C. 0.77 gal/min D. 7.7 gal/min E. 3.874 lb/hr
NAME _____________________ __________ Take Home Test #1, page 3 ARCH 335 / 615, Spring 2024, Prof. J.Haberl DO YOUR OWN WORK! 12. What is the sensible heat factor (SHF) for the coil? A. 0.45 B. 0.54 C. 0.35 D. 0.65 E. 1.00 13. On the psychrometric chart if I’m at a point A (75 Tdb, 60% RH) and I move to a point B (65 Tdb, 100% RH) up and to the left above point A what must I do to the air at point A? A. Heat the air (sensible heating). B. Spray water into the air that is the same temp as the air (evap. cooling). C. Spray water into the air that is the same temp as the air (evap. cooling) and then heat the air. D. Spray hot steam into the air. 14. According to LLNL, in 2020, residential and commercial energy end uses consumed 20.16 Quads, or 21.7% of the total source energy use (i.e., 92.9 Quads). How much source energy use would this represent if the waste energy use from the electricity power production were included? A. 35.7 Quads B. 37.6 Quads C. 39.0 Quads D. 40.3 Quads 15. The temperature -25 C is equal to what? A. -13 F B. 410 R C. -22 F D. 240 K 16. Calculate + 100 GigaWatts + 1,000 MegaWatts + 1,000,000 kiloWatts? A. 102.0 GigaWatts B. 102,000 MegaWatts C. 102,000 kiloWatts D. A and B above 17. On the shading mask protractor shown, what are the vertical elliptical lines in the lower half of the diagram used for? A. To locate the front edge of a horizontal shade (point C). B. To locate the front edge of a side fin (point B). C. To locate the upper edge of a side fin (point A). D. None of the above
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help