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Search: Posts Made By: ham789
Forum: Conservation 03-21-19, 07:40 PM
Replies: 12
Views: 3,943
Posted By ham789
Filters like Filtrete have spec numbers that...

Filters like Filtrete have spec numbers that relate
to the size of particles and air resistance.
I couldn't find any way to relate the K&N filters to that
scale.
Forum: Solar Power 03-21-19, 07:27 PM
Replies: 5
Views: 1,643
Posted By ham789
There are numerous issues with this. To name a...

There are numerous issues with this.
To name a few...
The output of a panel is related to something like the cosine of
the angle of incidence. As the sun moves the output changes.
You can keep...
Forum: Geothermal & Heat Pumps 06-12-18, 08:02 PM
Replies: 17
Views: 7,283
Posted By ham789
R134 leaks

As it was explained to me...
The R134A molecule is VERY MUCH SMALLER than the molecule
for R12. It leaks out thru the hoses because they are too porous
to contain it. That's why you can't just...
Forum: Solar Heating 06-08-16, 03:13 AM
Replies: 7
Views: 3,171
Posted By ham789
efficiency?

This question created a bunch of other questions. After thinking about it...
The energy out of the system is equal to the solar energy impinging on it.
The efficiency of the system is the ratio of...
Forum: Solar Power 04-16-16, 01:17 AM
Replies: 22
Views: 5,045
Posted By ham789
Interesting project. Please post more pictures...

Interesting project.
Please post more pictures to show how you dealt with some issues...
Looks like sheet metal with the "sign" cut out. Very nice job...

How did you address the issue of having...
Forum: Conservation 01-12-16, 06:56 PM
Replies: 9
Views: 2,541
Posted By ham789
Measure everything.

The more inside/outside differential temperature,
the more resolution you get.
I'd measure both inside and outside. Otherwise,
you have to guess the leakage path.
Windy day can give you even...
Forum: Solar Power 10-06-15, 06:45 PM
Replies: 32
Views: 13,557
Posted By ham789
Looks like a fun project. I don't have any...

Looks like a fun project.
I don't have any direct experience, but I do have some concerns.
I'd worry about the generator shaking the life out of both the
solar panels and the battery.
I do about...
Forum: Other Improvements 08-14-15, 02:48 AM
Replies: 16
Views: 4,653
Posted By ham789
Yep, standard patio door with standard patio...

Yep, standard patio door with standard patio screen.
Not too restrictive.

Not too much chance of a bug flying against the wind
and getting thru the fan anyway.
This fan was made 40 years ago...
Forum: Other Improvements 08-12-15, 03:18 AM
Replies: 16
Views: 4,653
Posted By ham789
arduino temp/humidity

There you go.

Wiring up DHT11 Temp & Humidity sensor to the Arduino | www.hobbyist.co.nz (http://www.hobbyist.co.nz/?q=documentations/wiring-up-dht11-temp-humidity-sensor-to-your-arduino)

Looks...
Forum: Other Improvements 07-14-15, 11:53 PM
Replies: 16
Views: 4,653
Posted By ham789
dew point calculator

Dew Point Calculator (http://www.dpcalc.org/)
It's optimized to show mold growth potential.

it's not a controller, but with current humidity and temperature
forecast, you can make some guesses....
Forum: Tools 01-25-15, 04:58 PM
Replies: 39
Views: 10,158
Posted By ham789
cool

Friend brought his Seek by yesterday. Way cool device.
Seems like it's compatible with relatively few of the newer
Android phones.
I don't need a phone, so buying one to go with the Seek
pushes...
Forum: Conservation 07-29-13, 04:41 PM
Replies: 568
Views: 618,412
Posted By ham789
Intercooler

I stumbled across a turbocharger intercooler and said, "What the heck" and bought it for $5.
Plan is to stick it diagonally in the window so the ports
fall inside and outside the plane of the...
Forum: Conservation 07-17-13, 08:12 PM
Replies: 14
Views: 4,746
Posted By ham789
OK, but with most things in life, the devil is in...

OK, but with most things in life, the devil is in the details.
What's the temperature of the water when you turn off
the heater?
What's the temperature of the water just before you turn
it back...
Forum: Conservation 07-16-13, 08:23 PM
Replies: 14
Views: 4,746
Posted By ham789
What are the advantages of a water heater timer? ...

What are the advantages of a water heater timer?

What's the thermal time constant of a water heater?

How does shorter time help?
Forum: Appliances & Gadgets 06-06-13, 08:13 PM
Replies: 81
Views: 31,349
Posted By ham789
What was the roadblock to just using the freezer...

What was the roadblock to just using the freezer thermostat?
Maybe with some tweaking of the range...
Forum: Conservation 02-02-13, 11:19 AM
Replies: 568
Views: 618,412
Posted By ham789
I took a crack at analyzing the freeze problem. ...

I took a crack at analyzing the freeze problem.

I assumed 75% overall efficiency and 50% for each core
and worked the problem backwards. I assumed a lot
of model parameters I can't really...
Forum: Conservation 02-01-13, 07:24 AM
Replies: 568
Views: 618,412
Posted By ham789
Very nice work. What tools did you use to make...

Very nice work. What tools did you use to make the drawings?

I think you have a fundamental air flow problem.
You want the ports exposed to the outside to be
on the same end of the exchanger. ...
Forum: Conservation 01-30-13, 06:10 PM
Replies: 568
Views: 618,412
Posted By ham789
My Toy HRV runs the air straight thru the...

My Toy HRV runs the air straight thru the coroplast
channels, but the open layers have side-exit at each end.
That should give some turbulence to the flow.

A relatively easy experiment is to cut...
Forum: Geothermal & Heat Pumps 01-30-13, 05:16 PM
Replies: 57
Views: 26,612
Posted By ham789
First thing I'd try is to put a pressure gauge on...

First thing I'd try is to put a pressure gauge on the
output and a vacuum gauge on the input.
Run the compressor and see if you can tell which side
has the problem. Might be interesting to...
Forum: Conservation 01-29-13, 03:20 PM
Replies: 568
Views: 618,412
Posted By ham789
Thanks for the info. The whole metrology...

Thanks for the info.
The whole metrology problem is why I don't chase 100% efficiency.
The goal is to subtract two equal numbers. But, as you approach
that equality, the measurement error in the...
Forum: Conservation 01-28-13, 05:54 PM
Replies: 568
Views: 618,412
Posted By ham789
Didn't mean to upset you... It's hard to argue...

Didn't mean to upset you...
It's hard to argue with numbers. Sounds like yours is working
fine.

I was reacting to:
Now, the first time I made the measurements I got as follows:

Aluminum...
Forum: Conservation 01-28-13, 02:30 AM
Replies: 568
Views: 618,412
Posted By ham789
I think cleaning is a good idea, but don't think...

I think cleaning is a good idea, but don't think you need to go
overboard.
I had a window A/C for 40 years and never cleaned the coils/fins etc.
Every summer evening, I open the windows and suck...
Forum: Conservation 01-27-13, 09:06 PM
Replies: 568
Views: 618,412
Posted By ham789
There's a lot of engineering data here ...

There's a lot of engineering data here
Klingenburg GmbH - Energy Recovery - Counterflow plate heat exchanger (http://www.klingenburg-usa.com/products/cf-plate-heat-exchanger.html)
that might...
Forum: Conservation 01-27-13, 06:57 PM
Replies: 568
Views: 618,412
Posted By ham789
This is my current configuration. I slid out...

This is my current configuration.
I slid out the end fan, raised the top fan slightly
and slid out the core to give some sense of the
construction.

It all fits together like a Chinese jigsaw...
Forum: Conservation 01-27-13, 05:49 PM
Replies: 568
Views: 618,412
Posted By ham789
Ok, I'm still a little confused. Sounds like the...

Ok, I'm still a little confused. Sounds like the solid PP
is identical sheets of coroplast rotated 90 degrees.
There are two problems with that. First, the thickness
of the conductive path is...
Showing results 1 to 25 of 42

 
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