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The rate at which ice or water cools/warms is largely dependent on the surface area of contact. If the salted water has more surface area, it will cool faster. This is why "slush" from salted ice cubes works better than just ice cubes. Of course the ice needs at least partially melt to form the "slush."
Salt lowers the freezing/melting point. This results in "slush," rather than solid ice which improves heat transfer. The "slush" will remain at this lower temperature until all the ice is melted. This is why salt is added to the ice in an ice cream maker - to improve heat transfer..
Not true. Because the freezing point is lowered, it takes longer to freeze the water. More heat must be removed.1. Salt lowers the freezing/melting point. This results in "slush," rather than solid ice which improves heat transfer. The "slush" will remain at this lower temperature until all the ice is melted. This is why salt is added to the ice in an ice cream maker - to improve heat transfer..2. Ice can be at any temperature below freezing. If your freezer is set at 10F, the ice will be at 10F. If your freezer is set at -10F, the ice will be at -10F.
1. WATTS=POWER is correct. It is not at all fuzzy. Power is the rate at which energy is transferred. Watts is the rate at which electrical energy is transferred.2. Higher voltage delivers more power through smaller wires, which could result in higher torque, depending on what the power is used for.3. Higher amps at same voltage means more power. Could be used to go faster or to climb steeper hills.4. Electricity is NOT billed in kilowatts (which is power). It is billed in kilowatt-hours, which is energy used.The OP got it right!
Nicely summarized. I see similar misstatements frequently on various forums I participate in. Voltage pushes amps through a wire with resistance like pressure pushes flow through a pipe with friction (or head).
Nice job, but geeze ...all this to save 8 to 10 minutes per day of pedaling? I hope you find other uses. I guess this is a "because I can" project. Anyway, very creative.
Isopropyl alcohol (aka rubbing alcohol) is not denatured. It is commonly available at concentrations of 70% and 91%, the balance being water. Denatured alcohol is ethyl alcohol which is made undrinkable by adding chemicals (denaturants).
Lacquer thinner is my go-to-of-last-resort as it can attack most plastics and can leave a sticky surface. Isopropyl alcohol is commonly applied to the skin as an antiseptic or astringent. The cautions indicated by the author are overblown.
My order of preference to remove surface film (paper, adhesive) is:isopropyl alcohol: will not damage surface, but is often ineffectiveWD-40: usually works with adhesive residue, leaves a shiny surface Lacquer thinner: usually works but can damage plastic surface, OK for metal
What material did you use for the top?
Cleaning and Finishing PVC
Cutting and Making Holes
Very, very well done, however I think your assumption of 10 hours of sun daily to calculate available watt-hours based on panel watt rating is very optimistic. To get the manufacture's rated watts, everything has to be perfect, i.e. optimum orientation of the panel to the sun. Based on my reading of various sources, 4-6 hours/day is more realistic.
AGM lead acid batteries eliminate any spill or watering issues, plus they are not vented. It is true that they are best not routinely discharged below 50% for long life, however occasional discharge below this will have minimal impact. They are also somewhat more expensive than flooded cell batteries. If high quality and properly maintained (minimize discharge below 50%), AGMs will certainly last longer than a couple of years. Mine have been in RV service for 6 seasons with no signs of failure. Lithium batteries have their own issues, including: VERY expensive, different charge profile, cannot be charged when below 32F. The decision to go lithium should be preceeded by a very careful analysis.
A short, to the point, video. Nice!
If "Meths" is ethyl/methyl alcohol, that definitely is NOT minerals spirits.
The microwave method is the fastest, simplest by far.
I find the biggest advantage to this project is that the shower water is hot within about 10 seconds of turning it on, even though the "bypass" is located at a nearby sink.
EXCELLENT! Here's one more: remove duct tape residue. Works great!To all the naysayers: WD-40 is not a universal solution to all problems, but it does have its place.
More like 1/3 of the solution: WD40, duct tape, vice grips. (According to Clint Eastwood in GranTorino.)
Setup and Print
Easy 3D Printing Class
Name That Keychain
Using a Slicer
Tools + Materials
Clever, but the explanation is incorrect. Salt lowers the freezing point of water. Thus, the ice melts at a temperature of less than 32F producing water that is less than 32F. This increases the heat transfer (cooling). This is the same reason why salt is used to make homemade ice cream.
I use Step 5: Toothpick Screw Holder constantly to repair stripped wood screws in my RV. Even better: add a dab of glue to the end of the toothpick bundle before inserting into the hole. The screw and toothpicks will be even more secure.
Hey, maybe it's just me, but some key details are missing. Like: how to connect the poles; how to connect the rope to the cloth. A tarp with grommets might simplify the entire project. Ropes can be tightened with a tauntline hitch.
"Dude, you need to repeat Chem 101; of COURSE its a chemical reaction when one material is dissolved by another. It is the chemical structures of the different substances that determine whether or not one is solvent."Simply not true. Dissolve sugar in water. The sugar remains sugar; the water remains water. The chemical composition is not changed in any way. Perhaps you need better understanding of the definition of "chemical reaction."M.S. Chemical Engineering
I also laid a brick on each corner of the support grate (below the fiberfill). As the fiberfill loads with gunk, the upward water flow tends to lift the filter box. The weight of the bricks prevents this. In addition, I secured each long side side of the lid with a wire tie mid-way, drilling a small hole through the lid and box edge. Again the upward flow of the water against the partially loaded fiberfill tends to bow the lid in the middle and lift it. I am hopeful that these two mods will allow the filters to run all season with no attention.
For the upcoming season, I decided to replace the bulk loose polyester fiberfill with a "blanket" type (see photo), also from Walmart. The loose fiberfill is a pain to remove once it is wet and filled with gunk since there are many pieces. Hopefully, the blanket can be rolled and removed as one piece. One blanket can be easily folded to fit one filter box.
Battery is 2.2Ah, 11.1v, therefore, 24.42 wh.Light draws 100w, therefore, (24.42/100)x60=14.6 minutes to full dischargeAbout right?
item # 17003http://www.command.com/3M/en_US/command/products/~/Command-Large-Utility-Hook?N=5924736+3294529207+3294773688&rt=rudhttp://multimedia.3m.com/mws/media/1070098O/17003e...
Refurbishing Cabinet Hardware
Refurbishing Cabinet HardwareView Instructable »
How to build another useless machine: easy to make, and hard to use!
I solved a similar problem somewhat differently. My original corded wall phone did not have a nearby receptacle. When I installed a cordless phone, I cut the plug end of an extension cord and connected it to the hot wire feeding the switch underneath, along with the neutral (see photo). I then plugged the transformer into the receptacle end of the cord and tucked the whole thing into the wall. I know, codes, codes, codes. It's been 25+ years with no problems. The photo is of the 2nd and newer cordless phone.
That's why God made adjustable wrenches.
Since chlorine is a gas, it's very difficult to sprinkle. Perhaps an instructable ....?
Yes, chlorine is a poison. Which is exactly why it is used and why, unlike many parts of the world, our water, with few exceptions, is safe to drink. Nothing like unsubstantiated paranoia.
Install an under-the-sink reverse osmosis unit. Much simpler long term than this tedious method.
If the loss is 30%, the correct calculation is 365/(1-0.3)=521 (not 475). This is 10% more than the calculation shown.
Actually the battery will have more than rated capacity at current draws less than the 20 hour rate due to the Peukert effect. The reverse is true as well.Also, "watts an hour" is meaningless. A watt is a measure of power, which is energy per unit time, already a rate of energy flow.
The best time to go after a nest is after dusk when the critters are all in the nest. During the day, many are out and about.
Heating the kitchen to cool the bedroom? Actually, that is kind of silly. Especially since the cooler, denser upstairs air will fall and the warmer, less dense kitchen air will rise making both rooms about the same. Maybe an airlock to isolate the bedroom?
The ice in the soda bottles melts. It does not evaporate. There is no evaporation. The discussion regarding "swamp coolers" is irrelevant.
You nailed it. Not just "chasing your tail," but a net heat gain.
I used Command brand hooks, three for the largest lid. Completely removable - no permanent impact.
Not hardly! Air is 78% nitrogen, which doesn't change. The oxygen (21%) combines with carbon and/or sulfur to form CO2 and/or SO2. No change in the moles of gas. If this works, it is likely because the air is heated, allowing some gas to vent. When it begins cooling, the egg likely forms a seal, allowing a vacuum to form in the bottle, pulling in the egg.
Not a bad idea. Maybe rough it up a bit with sandpaper first to help it stick.
Testing the water is not necessary. By the end of the season, when I remove the pump and drain the header pond, the lava rocks have become coated/filled with algae and muck. They become a solid mass by Spring. Without cleaning, the flow would be blocked and the surface area for bacterial growth greatly diminished..Cleaning the poly-fil for reuse is virtually impossible and definitely not worth the $10, or so, annual cost.
Pond FilterView Instructable »
Easiest Cupboard Pan Lid Organiser