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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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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- What is the name of the conference that was held in Canada in 1987 to attempt to solve the problem of refrigerants released into the atmosphere?arrow_forwardAn increase in the natural greenhouse effect that leads to heating of the earth is called _____.arrow_forward1-What is fog? Show on the psychrometric chart when two air streams yield fogged state of air? 2-Show the following processes on the skeleton psychrometric chart: (a) Dehumidification of moist air by cooling; and (b) Adiabatic mixing of two air streams? 3-With the help of psychrometric chart, explain the following processes: 1. Sensible heating and sensible cooling process; 2. Heating and dehumidification process : 3. Cooling and humidification process; and 4. Cooling and dehumidification process? 4- Prove that the partial pressure of water vapour in the atmospheric air remains constant as long as the specific humidity remains constant? 5-An unsaturated air stream is undergoing adiabatic saturation process and the outgoing air is saturated. Draw the system schematically. Represent the process on T-s and psychrometric charts. Find, for the incoming stream of air, humidity ratio from the adiabatic saturation equation obtained from heat balance? 6-Prove that the enthalpy of the…arrow_forward
- What is the role of gases like CO2, N2O and CH4 in Earth's atmosphere?arrow_forwarddetermine the saturation mixing ratio and the mixing ratio of each of the following air samples. For the SMR and MR, leave three decimal places (round to the nearest thousandth). The rank the air samples from highest vapor content to lowest (1 is highest and 6 is lowest). Temp: 14C ; SMR: g/kg ; RH: 90% ; MR: g/kg; Rank: Temp: 20C ; SMR: g/kg ; RH: 60% ; MR: g/kg; Rank: Temp: 24C ; SMR: g/kg ; RH: 40% ; MR: g/kg; Rank: Temp: 30C ; SMR: g/kg ; RH: 40% ; MR: g/kg; Rank: Temp: 34C ; SMR: g/kg ; RH: 30% ; MR: g/kg; Rank: Temp: 38C ; SMR: g/kg ; RH: 15% ; MR: g/kg; Rank: Please explain how you got the rank number.arrow_forwardhelp asap The conditions of the inside air are 31°C and the water vapour pressure is 36,000 PA and the atmospheric pressure is 76,000 please calculate the moisture content in kg wv/kg dry air.arrow_forward
- 27 - If the temperature of methane gas at a temperature of 20ºC in a tank of constant volume and pressure of 1.21 atmospheres is increased by 10ºC, what will its pressure be? a) 104.78 kPa B) 126.79 kPa NS) 115.26 kPa D) 125.1 atm TO) 0.98 bararrow_forwardMultiple Choice. Choose the correct answer and show COMPLETEsolution. (Gas-Vapor Mixtures Properties of atmospheric air)arrow_forwardWhy is information regarding the specific volume of gases important to the designer of air-conditioning, heating, and refrigeration equipment?arrow_forward
- Air at 24 °C dry-bulg and 15 °C wet-bulb enters a humidifier and leaves at 41 °C dry-bulb and 21 °C wet-bulb. How much moisture has been added per kilogram of dry air?arrow_forwardDefine specific heats. Differentiate between specific heats at constant pressure and constant volume. Give their examples. Write the values of cp, cv, R, and γ for air and combustion products.arrow_forwardWould entering a room which contains air that is 80% nitrogen, 15% oxygen and 5% carbon dioxide alter ventilation rate?arrow_forward
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