How to reduce humidity through mist eliminator

Welcome to PF.

farispksalmanul said:

TL;DR Summary: Hy. I was working on a project to reduce humidity levels through mist eliminators. I have a room 1 that intakes air and i spray coolled mist to the same room 1. At the end of the room there is a fan and mist eliminator. What i was thinking is when air temp outside is 45 degree and humidity is 85% percentage, to achive dew point we need to reduce only 4 degree celecious.

Since you are introducing mist artificially and then extracting it, I assume this is a project for schoolwork? If so, I can more your thread to the schoolwork forums for you.

Also, you seriously have an interior temperature of 45C and exterior temperature of 4C? What kind of a hothouse is this?

Why are you spraying mist into an airstream you want to dehumidify? It seems like you are doing the opposite of what you really want. And why isn't the answer just "air conditioner"? You seem to be leaving out a lot of important details. Please give a complete description of the application and known constraints.

I want to implement this in a greenhouse for agriculture. Its not a project for schools. Outside temperature is 45 degree and relative humidity is 85%. Mist eliminator only collects water droplets not fog, or it canot collect water from a normal air. So i was planning to add moisture to make airstream to reach dew point and collect this water using mist eliminators.

farispksalmanul said:

Outside temperature is 45 degree and relative humidity is 85%. Mist eliminator only collects water droplets not fog, or it canot collect water from a normal air. So i was planning to add moisture to make airstream to reach dew point and collect this water using mist eliminators.

This approach will increase the humidity past saturation and then collect the excess mist, leaving the air at 100% RH.

Welcome!
Is the temperature in C or F?
How much air is being introduced and exhausted?
What interior conditions are desired?
Insulated building?
Solar load?

For clarity i have uploaded a video to youtube. Please.

Lnewqban said:

Welcome!
Is the temperature in C or F?
How much air is being introduced and exhausted?
What interior conditions are desired?
Insulated building?
Solar load?

Degree celcious
Interior condition is 75% to 85 % relative humidity and temp between 23-27 degree celcious
Building is made by (closed greenhouse) all side covered with poly sheets.
Solar load have no idea
How much air is supplied (no idea)

You would get better results if you sent the cooled water from the chiller thru a heat exchanger, maybe something like a radiator from a car or truck.

Then a fan could blow air thru the heat exchanger, radiator, and you have cool air.

That is about how air conditioners work.
Cheers,
Tom

Tom.G said:

You would get better results if you sent the cooled water from the chiller thru a heat exchanger, maybe something like a radiator from a car or truck.

Then a fan could blow air thru the heat exchanger, radiator, and you have cool air.

That is about how air conditioners work.
Cheers,
Tom

I agree. If he OP has a mechanism for producing cold droplets of air then it will involve a heat exchanger (/condenser / something) . At some stage, the water droplets will need to be collected and pumped away before they heat up and start to evaporate which could take you back to square one. So why not just condense the water directly from the air to the surface of the heat exchanger.

This thought experiment has been far from a waste of time, though because it's made us all think.