Calculating RH and Heated Air Take-Up

  • Thread starter chrislock
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In summary, the conversation involves a physics question about the take up of water into air given certain conditions. The person speaking has written a piece of software and is seeking confirmation of their answer, which is 189.6 Kg/hr, taking into account the expansion of air. They initially gave the incorrect answer of 1365.3 Kg/hr.
  • #1
chrislock
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I know that this is a bit off the beaten track, (its a physics question) but I'm trying to confirm the results of a piece of software I've written.

If you have a fan delivering air at 1000 cu m/hr from an ambient source at 27C Dry bulb and 24.3C wetbulb (approx 80%RH i.e. 18 gmswater/ Kg air) and you heat and then spray the resultant air with water to ensure its at 65C and 100% RH - what is the take up of water into the air, assuming it all gets removed? i.e. how many KG / hr.

This sounds complicated but it really isnt. I just need someone to confirm my answer.
Thanks,
Chris
 
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  • #2
What was your answer?
 
  • #3
I didnt really want to give this - in case it influenced anyone else's!
(I will if you have an answer though)
Vhris
 
  • #4
Sorry, but that's not how it works here. We don't just hand out answers, we help people find them. So as a starting point, we need what you have so far.
 
  • #5
OK - 1365.3 Kg/hr, taking into account the expansion of air (8112 cu m/hr)
Chris
 
  • #6
Sorry - I entered the wrong info!
189.6 Kg/hr, taking into account the expansion of air (1126.7 cu m/hr)
Chris
 

FAQ: Calculating RH and Heated Air Take-Up

1. How do you calculate relative humidity (RH)?

The formula for calculating relative humidity is: RH = (vapor pressure/ saturation vapor pressure) x 100%. Vapor pressure can be calculated using the ideal gas law, while saturation vapor pressure can be found in tables or calculated using the Antoine equation.

2. What is the purpose of calculating heated air take-up?

The purpose of calculating heated air take-up is to determine the amount of moisture that a given volume of heated air can hold. This is important in applications such as HVAC systems, where the heated air needs to be able to maintain a certain level of relative humidity.

3. How is heated air take-up affected by temperature?

As the temperature of air increases, its ability to hold moisture also increases. This means that the heated air take-up will increase as temperature increases. This is because warmer air has a higher saturation vapor pressure, allowing it to hold more moisture.

4. How does humidity affect the heating and cooling process?

Humidity plays a crucial role in the heating and cooling process. Higher levels of humidity can make a room feel warmer, as the moisture in the air prevents sweat from evaporating off the skin. In cooling processes, humidity must be removed from the air in order to effectively lower the temperature.

5. Can humidity levels be controlled in a closed system?

Yes, humidity levels can be controlled in a closed system. This can be done through the use of dehumidifiers or humidifiers, which remove or add moisture to the air, respectively. Additionally, proper ventilation and air flow can also help control humidity levels in a closed system.

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