# Tag Info

7

More stuff in the way of the flow causes more back-pressure. Think of a thicker filter as being two filters in series. For example, if a filter develops 0.1 PSI across it when 100 CFM air flow is going thru it, then two filters in the same 100 CFM air flow must together drop 0.2 PSI across them. Depending on what exactly your criteria for efficiency are, ...

4

The short answer is that if the air in or around your home is not safe and breathable, you need to leave the area and possibly seek medical attention. You're extremely unlikely to be able to MacGyver your way out of a truly life-threatening air quality event caused by a wildfire (or any comparable industrial accident). Follow the advice laid out in the CDC ...

3

Generally speaking, Reverse Osmosis is a final step purification and is designed to concentrate up dissolved solids, especially metals (Sodium, potassium etc). With that in mind, anything OTHER than those metals (often abbreviated Total Dissolved Solids) requires upfront filtration. Below is a size occlusion filtration chart showing the relative particle ...

3

We lived in information era. Software here are for any problem. But all sciences software are very hard to master: today (IMHO) more than 80% physics evaluation base on finite-element method (FEM). FEM has a lot tensor's equations. Solvation of these equations are frequently make big load to your computer (CPU and sometimes GPU). Because of this, FEM ...

3

There are are three independent problems with air containing "smoke" from a fire: Particles Poisonous or unhealthy combustion gasses. Oxygen depletion. Unless you're really close to the fire, #1 is the biggest problem. As you already found, plain old mechanical filtration is the simplest way to address this. There are commercial air filters for HVAC ...

2

Filters can be evaluated by a few different parameters. "efficiency" is a broad term that doesnt lend to a better understanding in this application. Here are some better metrics to consider: Maximum flowrate (same as pressure drop or efficency when considering a power loss from the pressure drop. Proportionally increases with filter surface area.) Maximum ...

2

In terms of bed capacity, dry gas—0% moisture, or as close as you can get—is generally optimal. Section 12.4 of Air Pollution Control (Cooper & Alley, 4th ed.) characterizes the impact of several factors on the theoretical equilibrium saturation capacity of a fixed-bed adsorption system: Thickness of the adsorption zone (in which the sorbent is not ...

2

The few important reasons is that the digging was done manually by laborers, who like the miners had to work by getting in and needed cavernous spaces to breath and also needed to move the dirt out on makeshift tracks and wagons. Modern engineering which strives for efficiency and least damage to echo system, designs the minimal working size pipes which ...

2

Some things to consider regarding Victorian era sewers. How much effluent do humans produce each day and how many people are there and thus how large does a sewerage system need to be to accommodate that quantity of effluent? The other thing to consider is the technology available at the time and the ease and cost of construction. Allied to this is the need ...

1

For every doubling of the filter area, the flow resistance is cut in half, and the useful lifetime of the filter is doubled. But because your kiosk is so small, just go down to your local hardware store and buy a disposable furnace filter for a home heating system in the smallest size available. Those filters come in different filtration particle size ...

1

It appears the membranes are available without pressure vessel (which could be a piece of pipe, probably DN125) but since the company does turn key isntallations too you could probably procure a pre-installed filtration plant (wiser than to develop one from scratch). In your place I would ... search and ask if my current employer has priviosly designed/...

1

I think this is the kind of thing you are looking for. http://m.eaton.com/mobile/ProductsandSolutions/Filtration/ManualPipelineStrainers/DuplexBasketStrainers/Model505-8inch/index.htm They are common in fuel systems where you need to be able to clean one strainer while maintaining flow. You could build your own system using any sort of bypass valve and ...

1

Standard lab approach is vacuum filtration: Get a Buchner funnel and filter paper sized to capture the smallest particles you care to measure. Now: Weigh filter. Place filter in funnel and wet with solvent. Connect funnel to vacuum filter flask. Turn on vacuum. Pour sample into funnel. Continue to rinse sample with a volatile solvent until it is clean. ...

1

Your math seems to be sound. It looks like you calculated everything correctly up to where you calculated $L$. At that point you should have all of the variables solved for and there should be no need to refine your numbers.

Only top voted, non community-wiki answers of a minimum length are eligible