Correction sir 1. Vapour pressure is exerted by liquids not by air. I think you want to say partial pressure of air is less than the saturation pressure or vapour pressure. 2. Latent heat of evaporation for water is supplied by air by decreasing it's own internal energy. There is no such thing like latent heat of absorption as pointed out by Ashish.
In an evaporative cooler what happens to the water temperature as the water evaporates? Is it possible for both the water and the air to cool as a result of the phase change? The reason I ask is that in other lectures I have seen it described as when the water evaporates it takes heat from the surrounding air and the water itself. But in a cooling tower the water cools and the air heats up. What determines which fluid cools and which heats?
In an air washer installation, 100 m3/min of air at 5 oC DBT and 80% relative humidity has to be heated and humidified to 25 oC and 45% of relative humidity by the following processes; (a) preheating, (b) adiabatic saturation in a re-circulated air washer up to 95% relative humidity and then (c) reheat to final state. Calculate: 1. total heat added in kW 2. water mass to be provided to the washer and 3. humidifying efficiency of the air washer. Can you answer this question, thank you
In an evaporative cooler what happens to the water temperature as the water evaporates? Is it possible for both the water and the air to cool as a result of the phase change? The reason I ask is that in other lectures I have seen it described as when the water evaporates it takes heat from the surrounding air and the water itself. But in a cooling tower the water cools and the air heats up. What determines which fluid cools and which heats?
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Sir, I guess it will be partial pressure of water vapour in the flowing air
Correction sir
1. Vapour pressure is exerted by liquids not by air. I think you want to say partial pressure of air is less than the saturation pressure or vapour pressure.
2. Latent heat of evaporation for water is supplied by air by decreasing it's own internal energy. There is no such thing like latent heat of absorption as pointed out by Ashish.
In an evaporative cooler what happens to the water temperature as the water evaporates? Is it possible for both the water and the air to cool as a result of the phase change? The reason I ask is that in other lectures I have seen it described as when the water evaporates it takes heat from the surrounding air and the water itself. But in a cooling tower the water cools and the air heats up. What determines which fluid cools and which heats?
This is a very good explanation. Subtitles would be helpful. Thank you.
In an air washer installation, 100 m3/min of air at 5 oC DBT and 80% relative humidity has to be heated and humidified to 25 oC and 45% of relative humidity by the following processes; (a) preheating, (b) adiabatic saturation in a re-circulated air washer up to 95% relative humidity and then (c) reheat to final state. Calculate: 1. total heat added in kW 2. water mass to be provided to the washer and 3. humidifying efficiency of the air washer. Can you answer this question, thank you
Oh sir tussi great ho!!
How is this temperature different from WBT, you didn't explain.
Sir, I believe you want to say latent heat of evaporation at 4:50. There is no such thing as latent heat of absorption.
phase change at water to vapour in absorption raise latent heat
@@tnmurti6998 pl explain in urdu
why the makeup water enthalpy is hf2 ? why not hg2 ?
Air mass increases due to increase in water vapour content. It is the mass of dry air that remains constant
In an evaporative cooler what happens to the water temperature as the water evaporates? Is it possible for both the water and the air to cool as a result of the phase change? The reason I ask is that in other lectures I have seen it described as when the water evaporates it takes heat from the surrounding air and the water itself. But in a cooling tower the water cools and the air heats up. What determines which fluid cools and which heats?
@@brianmcdonough1685 pl explain
can you explain what is Hfg2?
heat of evaporation
@@tnmurti6998 when it is an inlet isnt it should be Hfg1
thank you so much sir!!!!
how can be enthalpy of moisture in air be hg1 ..it isnt saturated ..shoulnt it b hfg@ 0 celcius +Cpv t ?
Me to have the same
And even in a text book also it is mentioned as hg
Do we get an explanation sir
Thanking you
Plz explain adiabatic saturation temperature in hindi
Thank You