Questions tagged [evaporation]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
2
votes
2answers
89 views

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 ...
3
votes
2answers
1k 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 ...
1
vote
1answer
1k 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 ...
1
vote
2answers
73 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
0answers
13 views

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 ...
0
votes
1answer
30 views

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 ...
0
votes
0answers
21 views

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 ...
0
votes
3answers
53 views

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 ...
2
votes
1answer
558 views

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 ...
2
votes
1answer
62 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 : ...
1
vote
0answers
20 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 ...
2
votes
1answer
171 views

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
1answer
1k 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, ...
3
votes
1answer
274 views

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
2answers
141 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 ...
3
votes
1answer
728 views

Optimum airflow for drying with heated air

I'm building something to dry glass tubes. It's raised a question which I'd like some background knowledge on before I draw up requirements for the design. Say I want to dry something with heat alone,...