Air at 85°F, 1 atm, and 10% relative humidity enters an evaporative cooler operating at steady state. The volumetric flow rate of the incoming air is 895 ft3/min. Liquid water at 68°F enters the cooler and fully evaporates. Moist air exits the cooler at 70°F, 1 atm. There is no significant heat transfer between the device and its surroundings and kinetic and potential energy effects can be neglected.

Air at 85°F, 1 atm, and 10% relative humidity enters an evaporative cooler operating at steady state. The volumetric flow rate of the incoming air is 895 ft3/min. Liquid water at 68°F enters the cooler and fully evaporates. Moist air exits the cooler at 70°F, 1 atm. There is no significant heat transfer between the device and its surroundings and kinetic and potential energy effects can be neglected.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter50: Commercial, Packaged Rooftop, Variable Refrigerant Flow, And Variable Air Volume Systems

Section: Chapter Questions

Problem 3RQ: Mixed air is best described as the combination of A. exhaust air and return air. B. return air and...

See similar textbooks

Similar questions

For a typical sample of ambient air (at 30°C, 75% relative humidity and standard atmospheric pressure), the amount of moisture in kg per kg of dry air will be approximately, (a) 0.002 (b) 0.027 (c) 0.25 (d) 0.75
The figure shows a spray dryer operating at steady state. The mixture of liquid water and suspended solid particles entering through the spray head contains 30% solid particles by mass. Dry air enters at 177°C, 1 atm, and moist air exit at 85°C, 1 atm, and 21% relative humidity with a volumetric flow rate of 310 m3/min. The dried particles exit separately. Determine: the volumetric flow rate of the entering dry air, in m3/min. the rate that dried particles exit, in kg/min.
150cfm of saturated air at 85F dry bulb temperature is adiabatically mixed with 75cfm of air at 65F dry bulb temperature and 30% relative humidity. The mixture dry bulb temperature is most likely: 67F 72F 75F 78F 80F
A mixture having a molar analysis of 60% N2 and 40% CO2 enters an insulated compressor operating at steady state at 1 bar, 30°C with a mass flow rate of 5 kg/s and is compressed to 3 bar, 157°C.Neglecting kinetic and potential energy effects, determine:(a) the magnitude of the power required, in kW.(b) the isentropic compressor efficiency, in percent.(c) the rate of exergy destruction, in kW, for T0 = 300 K.
19 - Refrigerant 134a flows through two different pipes, forming a mixture. If the pressure of the mixture is 1.2 MPa and the enthalpy is 153.11 kJ/kg, which of the following is the degree of dryness? a) 0.3074 B) 0.1348 NS) 0.1290 D) 0.2264 TO) 0.1857
1. 1.5 kg of air is compressed at a pressure of 7 barg(gauge pressure). The isentropic index is 1.2 and the air intake is at 1 bar, 20 degrees Celcius & Relative Humidity =65%. Determine:(i) the amount of work required to compressed the air. (ii) the temperature at the end of compression.
1. "For questions 2, 3, and 4 you have a state point of 10C and 60% rh, give the values for these other properties. Enthalpy in kJ/kg dry air (within 2 kJ/kg da)" 2. "For questions 2, 3, and 4 you have a state point of 10C and 60% rh, give the values for these other properties. Moisture content in kg water vapour/kg dry air (within 0.0004 kg wv/kg da)" 3. "For questions 2, 3, and 4 you have a state point of 10C and 60% rh, give the values for these other properties. Specific volume in m3/kg dry air (within 0.01 m3/kg da)". 4. "Using the chart, find the relative humidity (in %) corresponding to a wet bulb temperature of 10C and a dry bulb temperature of 19C. (RH within 3%)" 5. What is the moisture content of this air/water vapour mixture in the previous question? (within 0.0004 kg wv/kg da) 6. "Questions 9, 10, 11, 12, a friend has a house in Toronto and is complaining of a damp, musty smelling basement. He tells you that to dry it, he will open the basement windows and have a fan blow…
Moist air enters a duct at 10 °C, 80 % RH, and a volumetric flow rate of 150 m3/min. The mixture is heated as it flows through the duct and exits at 30 °C. No moisture is added or removed, and the mixture pressure remains approximately constant at 1 bar. For steady-state operation the rate of heat transfer, in kJ/min; and the relative humidity at the exit. Compare your result with the psychrometric chart analysis ans no.3......urgent
Argon (Ar), at T1= 300 K, 1 bar with a mass flow rate of m˙1= 1 kg/s enters the insulated mixing chamber shown in the figure below and mixes with carbon dioxide (CO2) entering as a separate stream at 575 K, 1 bar with a mass flow rate of 0.5 kg/s. The mixture exits at 1 bar. Assume ideal gas behavior with k = 1.67 for Ar and k = 1.25 for CO2. For steady-state operation, determine:(a) the molar analysis of the exiting mixture.(b) the temperature of the exiting mixture, in K.(c) the rate of entropy production, in kW/K.
During performances, a theatre experiences a sensible heat load of 500,000 Btu/hr and moisture load of 175 lb/hr. Air enters the theatre at 65°F and 55% relative humidity and is removed when it reaches 75°F or 60% relative humidity, whichever comes first. What is the ventilation rate in mass of air per hour?
No load Inlet Absolute Humidity Enthalpy Relative Humidity Air Density Vapor Pressure Outlet Absolute Humidity Enthalpy Relative Humidity Air Density Vapor Pressure 0.5 kW load Inlet Absolute Humidity Enthalpy Relative Humidity Air Density Vapor Pressure Outlet Absolute Humidity Enthalpy Relative Humidity Air Density Vapor Pressure 1 kW load Inlet Absolute Humidity Enthalpy Relative Humidity Air Density Vapor Pressure Outlet Absolute Humidity Enthalpy Relative Humidity Air Density Vapor Pressure In regards to a cooling tower practical, I was wondering would someone be able to help me fill out this table using the psychometric chart since I am not exactly sure if I am doing it correctly so it would be please help and also provide a rough idea on how to determine the following parameters for each load case (maybe just…
Part A - Molar mass A gas mixture contains 3.6 kg of H2 with M_bar1 = 2.02 kg/kmol , 8.1 kg of N2 with M_bar2 = 28.01 kg/kmol , and 5.1 kg of Ar with M_bar3 = 39.95 kg/kmol. What is the apparent molar mass of the mixture? Express your answer with appropriate units to three significant figures. Part B - Specific enthalpy The mixture from Part A is initially at 330 K and 155 kPa . Heat is added until the mixture is at 430 K and 255 kPa. If cp1 = 14.307 kJ/kg⋅K, cp2 = 1.039 kJ/kg⋅K , and cp3 = 0.5203 kJ/kg⋅K, what is the change in specific enthalpy of the mixture using the perfect gas model? Express your answer with appropriate units to three significant figures. Part C - Entropy of mixing The mixture in Part A was formed by taking containers of H2, N2, and Ar all at 330 K and 155 kPa and allowing them to mix. Using the energy equation and ideal gas equation of state, it can be shown that if the gases are all initially at the same temperature and pressure, then…