In an attempt to conserve water and to be awarded LEED (Leadership in Energy and Environmental Design) certification, a 15.0 x 10° L cistern has been installed during construction of a new building. The cistern collects water from an HVAC (heating, ventilation and air-conditioning) system that is designed to provide 1.00 x 105 ft/min air at 22.0 °C and 40.0 % relative humidity after converting it from ambient conditions ( 35.0 °C, 86.0 % relative humidity). The collected condensate serves as the source of water for lawn maintenance. Assume P = 1 atm.

In an attempt to conserve water and to be awarded LEED (Leadership in Energy and Environmental Design) certification, a 15.0 x 10° L cistern has been installed during construction of a new building. The cistern collects water from an HVAC (heating, ventilation and air-conditioning) system that is designed to provide 1.00 x 105 ft/min air at 22.0 °C and 40.0 % relative humidity after converting it from ambient conditions ( 35.0 °C, 86.0 % relative humidity). The collected condensate serves as the source of water for lawn maintenance. Assume P = 1 atm.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

In an attempt to conserve water and to be awarded LEED (Leadership in Energy and Environmental Design) certification, a 20,000-liter cistern has been installed during construction of a new building. The cistern collects water from an HVAC (heating, ventilation, and air-conditioning) system designed to provide 2830 cubic meters of air per minute at 22°C and 50% relative humidity after converting it from ambient conditions (31°C, 70% relative humidity). The collected condensate serves as the source of water for lawn maintenance. Estimate (a) the rate of intake of air at ambient conditions in cubic feet per minute and (b) the hours of operation required to fill the cistern.
Define the range of permissible values for the barometric pressure, relative humidity, and temperature in your environment.
QUESTION 2 A new induced raft cooling tower is circulating 120 000 L/h of water that is cooled from 50 °C to 22 °C. How much blow-down and make-up is required to maintain the concentration of dissolved solids in the circulating water at four times the concentration in the make-up water? Assume the following: - The evaporated water contains no dissolved solids so all solids entering the system in the make-up must be removed by blow-down and windage. - The windage value of the induced draft cooling tower is 0.3% for each 5.6 °C. - The evaporative losses value is 1.1%.
The wet and dry bulbs of a wet/dry thermometer read 75°F and 112°F, respectively. What is the relative and absolute humidity?
Q2) Air is supplied to an automobile cabin from the outside, where the temperature is 20F and the relative humidity is 70%. It is desired to keep the cabin at 70F and Ø = 60%. Hoe many pounds of water must be supplied to each pound of air entering the car cabin if these conditions are to be met? The barometric pressure is 29.5 in.Hg. %3D Ans. (0.00797 lbs/Ibdry air)
ASHRAE standard 55, Thermal Environmental Conditions for Human Occupancy, notes that for thermal comfort purposes, the indoor temperature should range from approximately 67ºF to 82°F (19.4ºC to 27.8ºC), and systems designed to control humidity must be able to maintain a dew-point temperature of 16.8°C (62.2°F). ASHRAE standard 62.1, Ventilation and Acceptable Indoor Air Quality, recommends that relative humidity in occupied spaces be controlled to less than 65% to reduce the likelihood of conditions that can lead to microbial growth. Determine the minimum allowable indoor temperature that will ensure a humidity control system designed according to ASHRAE standard 55 will also satisfy the humidity requirements of standard 62.1
At an altitude of 1,600m, the atmospheric pressure is 81.49kPa. What is the specific humidity and relative humidity at this altitude when the dry and wet bulb temperatures are measured to be 10ºC and 5ºC respectively? Note, due to the low atmospheric pressure at 1,600m, the 1atm psychrometric chart is not valid for this problem. You will receive no points if you use it Result Relative humidity should be greater then 1 if we use 1600m altitude in solution not 1 atm
Atmospheric air passing over the cooling pipes of a cooling system is both cooled and dehumidified. Air enters the system at 33 °C temperature and 0.023 kg water/kg dry air humidity; It comes out at 15 °C temperature and 0.015 kg water/kg dry air humidity. If the flow rate of dry air is 0.55 kg/s, what is the amount of heat drawn from the system?
Find a formula to obtain the relative humidity of the air at different altitudes or atmospheric pressures different from sea level.
For Questions 6 and 7 The dry-bulb temperature and wet-bulb temperature of a sample of air are 23°C and 18°C, respectively. The pressure of the air is 97 kPa. If the air was adiabatically saturated: Question 6 Calculate the humidity ratio in kg of vapor per kg of dry air. Round your answer to 5 decimal places. Add your answer Question 7 What is its degree of saturation in %? Round your answer to 0 decimal places. Add your answer
Calculate the specific humidity if the relative humidity is50% and the capacity of the air (saturation specifichumidity) is 30g/kg. answer choices can be: 15 g/kg0.15 g/kg0.60 g/kg60 g/kg
After reaching saturation, if the room continues to cool to a temperature of 1.2 \deg C, how many grams of water vapor (per kg of air) will have had to condense out of the air to maintain a relative humidity of 100 %? g/Kg