# Questions tagged [evaporation]

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### Evaporative cooling fail

Back story: I am trying to make my attic (where I have my home office) comfortable during heat waves. I live in the Paris area, where heat waves are comparatively dry (in fact, they are the only time ...
• 129
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### Calculating Mass Transfer Coefficient for Vaporization Rate

I've been tasked with estimating the evaporation rate of a theoretical spill of 32% HCl solution for the purposes of estimating worst case impact to indoor air quality. The worst case approach would ...
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### Molecular Laser Isotope Separation for vapor $\rm H_2O$ and $\rm D_2O$ and why not implemented?

Based on the material from The absorption spectra of liquid phase H2O, HDO and D2O from 0·7 μm to 10 μm, where the IR absorption spectra of H20 and HDO are somewhat similar but noticeably different ...
263 views

### How can some clouds be removed from the sky?

I order to optimize output from a solar park I need to know how to remove clouds in the sky in an economically feasible way. Output improves tenfold without clouds. How can that be achieved? Weather ...
27 views

### The application of a Fluid (air) cooler on 20mm product, equations for temperature, moisture content and relative humidity (maybe modelling)

I currently have a fluid bed cooler which is cooling fine powder (around 20mm) product which enters upto 80 °C (minimum 40 °C) and leaves at a maximum of 25 °C. The mass flow rate is about 1200 kg/h. ...
68 views

### Is this proposed addition possible for an evaporative cooler?

Check the image attached below. This is a typical evaporative air cooler design. My proposed addition to this design is to retrieve the water back. What if we guide the evaporated water through a tube....
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### Help needed understanding atmospheric tank vent physics principals

I try not to be a complete moron but am not an engineer so please bear with me. I have this LP record ultrasonic cleaner system that uses a solution stored in a "tank" which is a simple ...
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### Will water boil from top-down radiant heating?

I've had a question about the nature of "boiling" for a while. When we observe water boiling, we are actually see several things happen. First, water vaporizes at spot on the bottom of our ...
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### Does forced convection account for energy transfer in this case?

I have to confess that thermodynamics is not a friend of mine. My system consists of a volatile droplet sitting on a thermally conductive substrate. The energy balance comprises heat lost due to ...
184 views

### What contaminant materials should be avoided for reaching ultra-high vacuum?

This question relates to ultra-high vacuum chambers (order of ~10−10 mbar) in experimental setups. [This question was asked at physics.stackexchange.com but removed due to being more about engineering....
71 views

### What would be the best setup to evaporate as much seawater as possible using the propane from a 1kg tank?

Out of curiosity, What would be the best setup to evaporate as much seawater as possible in using the propane from a 1kg tank? Will it be, Big pan, boil them all at once Small wide pan, boil them a ...
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### Homemade spray dryer - how to generate powerful hot air?

I am currently trying to create homemade spray dryer, Which is basically pumping hot air in a chamber where targeted liquid is sprayed, so that the water content could instantly evaporate, leaving ...
5k views

### Why do a swamp cooler and dehumidifier effectively cool a room when paired together in an enclosed space?

I've read in more than one place (e.g., here and here) that a swamp cooler (a.k.a., evaporative cooler) can be effectively paired with a dehumidifier to cool an enclosed space, but this makes no sense ...
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1 vote
79 views

### why not put the compressor right next to the evaporator?

the cold line from evaporator to compressor will gain tons of heat on a super hot day even with insulation. if they put the compressor right outside the evaporator, both of the long lines will be hot ...
1 vote
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### How does plant evapotranspiration reduce the required size of a chiller used to control the climate of an indoor farm?

When HVAC companies estimate the required size of a chiller unit for a greenhouse or an indoor farm, they reduce the estimated load by plant "transpiration cooling." I understand how transpiration ...
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### How could I automatically agitate water by blowing warm air over its surface?

I want to increase the evaporation rate in a tank by blowing warm air over the surface of the water in the tank; this will (hopefully) agitate the water, increase the airflow in the tank, and maybe ...
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### Estimating rate of drying by comparing identical process with different ambient humidity

We have a drying process where we take a thin bread product and cool it in a room at 11 C and 90% relative humidity. The product comes in at 80 C and comes out at 22 C. There is air blowing across the ...
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### How to dump moist air without heat backflow in evaporative cooling system?

I'm looking to design or purchase an evaporative cooling system for a small 70ft^2 California dorm room without air conditioning. This room has a single window and door to a large common space with a ...
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### Exiting air temperature in direct evaporative cooler vs cooling tower

In a direct evaporative cooler, dry air is passed by a water reservoir to evaporate water into the air, causing the latent heat of vaporization to be absorbed from both the air and the water; this ...
1 vote
275 views

### Calculate amount of evaporative coolers needed to cool down an area

I have a task to create a software that calculates how much evaporative coolers are needed to maintain a certain temperature in a given room. I need to create a simple form, where variables are next : ...
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1 vote
22 views

### Safely evaporate electrolyte from fragile porous substrate

We have porous ceramic platelets of ~50x5x1 mm³ thickness infiltrated with ammonium nitrate solution (NH4NO3). We want to decompose and evaporate it w/o damaging the fragile substrate (decomposition ...
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### Why is it generally assumed that the evaporator works isothermally?

Since an evaporator also a heat exchanger, how can the inlet and outlet temperatures of the HEX accepted as the same, i.e. isothermal? In this case, cold stream (inlet and outlet of the evaporator in ...
1 vote
2k views

### Is evaporative cooling for a pool effective?

Hot humid east TX; Large subdivision pool is warm ,92F. A plan is being make to cool it with evaportive spray . One data point is : dry bulb= 82.0 , wet bulb = 79.7 F. This is likely typical average ...
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1 vote
2k views

### Water vacuum evaporation thermodynamics

A vacuum evaporation system works keeping warm water inside a sealed vessel, which is evacuated with a reversed compressor (or vacuum pump) to keep an inside pressure lower than atmospheric pressure, ...
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### Is Vapor Compression Distillation inherently more efficient than a thermal-only boiler-condensor?

I'm having a hard time understanding the benefits of VCD (like Slingshot) over a conventional boiler in terms of volume of condensate produced per unit of energy input. I've found quite a few ...
1 vote
225 views

### Evaporative roof cooling

I have slightly inclined (50 cm over 6 meters) metal roof over my studio. The roof has bad thermal insluation -- 15 cm of mineral wool between sheet metal. The location is Kiev, Ukraine. Ambient ...
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