Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 50, Problem 18RQ
Explain how carbon dioxide levels can be used to estimate the occupancy level in a particular area in a structure.
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In regards to a cooling tower practical, the values in the table below are what I have found from the psychometric chart but I was wondering using this how would I be able to determine the following parameters for each load case:
Relative humidity of inlet air and outlet air
Humidity ratio of inlet and outlet air
Enthalpy of inlet and outlet air
Specific volume of inlet and outlet air
1. Plot the four locations in the psychrometric chart and determine the other properties foreach condition using a psychrometric chart (Appendix 8a and 8b).
Locations of air
Tdb, °C
Twb, °C
Ambient air
32
28
Conditioned air
25
20
Air at the dryer inlet
30
23
Air at the dryer outlet
33
27
3. What is the relationship between relative humidity and temperature? What about humidityratio and temperature?
What is the role of gases like CO2, N2O and CH4 in Earth's atmosphere?
Chapter 50 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 50 - Which of the following is true regarding the...Ch. 50 - Which process would best represent the opposite of...Ch. 50 - Mixed air is best described as the combination of...Ch. 50 - Which of the following should be taken into...Ch. 50 - A bonded roof is one that has A. reinforced steel...Ch. 50 - Properly installed roof curbs will reduce the...Ch. 50 - When rigging a unit to the roof, what minimum...Ch. 50 - What is the acceptable method for communicating...Ch. 50 - Prob. 9RQCh. 50 - Prob. 10RQ
Ch. 50 - The most efficient way to establish the best...Ch. 50 - Free-cooling can be accomplished if the
A....Ch. 50 - Prob. 13RQCh. 50 - Prob. 14RQCh. 50 - Explain why the outside air damper is typically...Ch. 50 - Briefly explain the purpose of ASHRAE Standard 62.Ch. 50 - Explain the concept of demand control ventilation.Ch. 50 - Explain how carbon dioxide levels can be used to...Ch. 50 - Describe the blowers used on VAV systems.Ch. 50 - A cooling-only VAV box has all of the following...Ch. 50 - Which of the following is true regarding a reheat...Ch. 50 - Variable refrigerant flow systems sense the...Ch. 50 - The acronym PID stands for ______, _____, and...Ch. 50 - Explain the main benefit of a heat-recovery VRF...Ch. 50 - The pump on a dry cooler can direct water to...Ch. 50 - During low ambient conditions, the space cooling...
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- please help me with thisarrow_forwardYour team started by assessing the boiler and steam network. You gathered the following information: The boiler operates at a pressure of 7 bar. The AF ratio is adjusted manually. The steam network is insulated, except at certain points where fittings and valves are present No visible steam leaks. The exhaust gas temperature is 330°C. The O2 percentage in the exhaust was found to be 8.5%. Maintenance is not regular. The boiler consumed 23,000 GJ of natural gas in 2022 (price of natural gas is JD 7.5/GJ). Prepare a short note (to be incorporated in the audit report which your team leader will compile) to provide your assessment of the boiler and steam system. Your contribution should include the following: 1. Estimation of current boiler efficiency. 2. Measures that can be taken to improve the boiler efficiency.arrow_forward1arrow_forward
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