I'd have to go with the Rust accumulation on the nail, it adds more surface area.
Seasonal moisture is adsorbed by wood (humidity in summer) and will rust nails over time.
although I do agree with Feebell & Danger that Pine resin will harden as well.
over eons it becomes amber...
in the housing energy trade we use hydrostatic pressure considering ground water perculating thru a slab or concrete wall.
in your filter HOUSING hydrocyanic pressure may be the rating that the molecules of plastic
can take before the material allows perculation thru the housing.
Just a...
you can rent smaller lawn-mower sized compacting units as well.
are you pouring your slab or foundation on top of this or is this the ground around the building?
if it's just the ground, you are doing a dis-service by adding in hard to shovel concrete.
Future gardeners will curse you LOL...
also: a design temp of 70'f
means delta-T would be:
20'F outside, 70'F inside = ΔT of 50'F
a general rule of thumb, and a "healthy" interior environment would be an air change rate of ONE total volume of air per hour in a relatively tight structure.
it can vary widely in old buildings...
generally speaking and in BTU's (US)
Two factors make up a total heat load of a given "box"
Transmissive calculation: Q=A*ΔT/R
In/ex filtration calculation: Q=.018*V*ΔT
Where Q is the Quantity of heat lost expressed in BTU's
R= R(esistive) value
A= area
ΔT= delta T (the...
typical, persistent leading down the garden path of theoretical efficiency's, equations
will not take "perpetual motion" as the answer.
more vague proposals/questions from a slightly different angle
aka a waste of time. TROLL.
please close and lock this thread LOL
I live in maine.
Had to dig up the well supply line one year, and didn't have time to finish the job before winter
we get minus 20'F from Christmas to mid January even February.
I took a 1" piece of pink foamboard (R-7) and laid it on top of the water line
covered with one foot of sand...
GRID & WIND:
===========
First I'd like to address the MYTH that the electrical grid is old and aging.
Power delivery companies spend fortunes improving the grid to insure that when you flick a switch the power is there. It's in their propaganda that they send with each bill ;)
The real...
I like FleeBell's answer for ready made other purposing of a control unit.
Basically they are all using resistance.
You could build your own small control using a multi position switch
that is connected to various resistors of differing values.
you can then experiment with the WIDE...
The EMF generated by Faraday's law of induction due to relative movement of a circuit and a magnetic field is the phenomenon underlying electrical generators.
When a permanent magnet is moved relative to a conductor, or vice versa, an electromotive force is created.
If the wire is connected...
The induced voltage depends on the diameter (area) of the coil and the number of turns of the coil.
The power is determined as well by the resistance of the coil.
Faraday's law will give you the induced emf in the coil:
V= (dΦ/dt)= NA(dB/dt)
N=the number of turns in the coil
A=area...