Within an air-handling system, a stream of air at T=30°C and 91=40% relative humidity is being mixed with air at T2-5°C and p2=20% relative humidity in order to create an outlet stream of air at T3=20°C with an absolute humidity of 03=0.006708 kgH20/kgdry air. The whole duct system has an overall pressure of 102 kPa. What is the ratio of volumetric flow rate ratio between the warm and cold incoming air streams (V, /V2)? 1 Mixing section 3.

Within an air-handling system, a stream of air at T=30°C and 91=40% relative humidity is being mixed with air at T2-5°C and p2=20% relative humidity in order to create an outlet stream of air at T3=20°C with an absolute humidity of 03=0.006708 kgH20/kgdry air. The whole duct system has an overall pressure of 102 kPa. What is the ratio of volumetric flow rate ratio between the warm and cold incoming air streams (V, /V2)? 1 Mixing section 3.

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

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 3RQ: The evaporator will normally operate at a(n) _____F boiling temperature when the indoor temperature...

See similar textbooks

Similar questions

In an uncomfortable summer day, the air is at 87OF and 80% relative humidity. A laboratory air conditioner is to deliver 1.00 x 103ft3/min of air at 55OF in order to maintain the interior air at an average temperature of 75OF and relative humidity of 40%.a. If the vent switch on the air conditioner is turned to the open position, outside air enters the unit as shown belown the air conditioner, the air is cooled to a temperature low enough to condense the necessary amount of water and reheated to 55OF, at which point it has the same absolute humidity as the room air. Determine the rate (lb/min) at which water is condensed, the temperature to which the air must be cooled to condense water at this rate, and the net tons of cooling required (Q), where 1 ton of cooling = -12,000 Btu/h. Assume A = 87 οF, B = 80 %, C = 55 οF.
what is the relationship and formula of relative humidity and temperature?
The design condition for a space is 77oF db and 50% relative humidity with 55oF db supply air at 90% relative humidity. A 50-ton, constant-volume space air- conditioning system uses face and bypass and water temperature control. Outdoor air is supplied at 95oF db, 60% relative humidity with a ratio of 1 lbm to 5 lbm re-circulated air. A part-load condition exists where the total space load is decreased by 50% and the SHF is increased to 90%. The outdoor air condition changes to 85oF db and 70% relative humidity. Assume sea-level conditions. a) At full – load conditions:a. Show all the processes on a psychrometric chart.b. Determine the temperature must the air be supplied to the space at fullload conditions.c. Determine the apparatus dew point temperature at full load conditions. b)At part – load conditions:a. Show all the processes on a psychrometric chart.b. Determine the temperature must the air be supplied to the space at partload conditions.c. Determine the apparatus dew point…
Saturated steam at standard atmospheric pressure is injected into a passing air stream in an amount sufficient to raise the absolute humidity from 0.0057 to 0.0143 kg w.v./kg d.a. If the air enters the humidifier at 21°C DBT, deter- mine its leaving state.
HUMIDIFIER: MASS BALANCE On a hot summer day, the air is at 30.6 ° C and 80% relative humidity. The air conditioning in a building supplies 30 m3 / min of air at 13 ° C to keep the air inside the building at an average temperature of 24 ° C and 40% relative humidity. If the ventilation switch of the air conditioner is “open”, the air from outside enters the unit as shown in the drawing (I): The air conditioner cools the air to a temperature low enough to condense the required amount of water and reheat it to 13 ° C (unsaturated current), at which point it has the same absolute humidity as the air in the building. Calculate: a. the speed at which condenses water (kg / min) b. the temperature at which the air must be cooled to condense water at this rate. Do the calculations without using the psychrometric chart (although 1 atm of current pressure can be assumed). If the ventilation switch is closed, as normal, the air from inside the building would be recirculated in the air…
ASHRAE standard 62.2 states that the minimum acceptable rate of airflow into and out of a room is 15cfm (cubic feet per minute). If air is supplied at 68°F with a relative humidity of 45%, how many gallons of water (minimum) must be added to a portable room humidifier before you go to sleep if you would like to maintain the room at 65% humidity for 7 hours?
An air-vapor mixture has a dry bulb temperature of 30°C and humidity ratio of 0.015. Calculate the enthalpy and the relative humidity.
Q# 2: Chapter 14: Gas vapor mixtures and air-Conditioning (Psychrometric chart) doly to design air conditioning systems using the psychrometric chart, and mass and energy balance relations CLO 4 Air enters an air-conditioning system at 20C and 70 percent relative humidity at a rate of 2 m' /min It is cooled to 15 °C and saturated when the liquid water leaves the system at 32°C. Calculate the amount of water removed from the air and the rate of heat removal from the air.
Calculate the relative humidity if the specific humidity is5g/kg and the capacity of the air (saturation specifichumidity) is 25g/kg. Options are :
a) How much heat in kW is required to raise 35 m3/min of air at 25∘Cdb and 0.016 specific humidity to 40∘Cdb?
Define absolute humidity and relative humidity. When an air conditioner is operated insummer, lots of water needs to be drained out from it. Briefly explain this situation inrelation to psychrometry.
Air with a total pressure of 101.3 kPa, a temperature of 12 °C and a relative humidity of 75% is both heated and humidified by water vapor. The exit conditions from the system are 25°C temperature and 75% relative humidity. If the flow rate of dry air is 1.9 kg/s, how much kg/s should the flow of steam be given to the air?