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Search: Posts Made By: stevehull
Forum: Conservation 06-08-14, 03:57 PM
Replies: 105
Views: 57,559
Posted By stevehull
BBP, AC and I have gone around this...

BBP,

AC and I have gone around this discussion several times. Be aware that he has a very small home and he has sealed it almost like a boat. In his case, about 1 home in a million (or less), he...
Forum: Conservation 03-28-13, 11:47 AM
Replies: 105
Views: 57,559
Posted By stevehull
AC, Please note that I am not against all...

AC,

Please note that I am not against all gas appliances. But they must be put in properly. I really like vented water heaters in the garage - not in the home. And I never ever recommend the...
Forum: Conservation 03-28-13, 08:28 AM
Replies: 105
Views: 57,559
Posted By stevehull
You are correct, carbon monoxide (CO) is by FAR...

You are correct, carbon monoxide (CO) is by FAR more of a danger than carbon dioxide (CO2).

Carbon monoxide binds to hemoglobin with 200 times the strength (affinity) of oxygen. It binds in the...
Forum: Conservation 03-28-13, 07:50 AM
Replies: 105
Views: 57,559
Posted By stevehull
AC - good observation on how "ventless" heaters...

AC - good observation on how "ventless" heaters are dangerous. Sadly, the national appliance alliance has labelled many appliances as "ventless". These include not only small heaters, but...
Forum: Conservation 03-08-13, 05:48 PM
Replies: 105
Views: 57,559
Posted By stevehull
Really? Digital has precision, not...

Really?

Digital has precision, not necessarily accuracy. There could be an entire discussion of double and triple precision data logging here :eek:

On the other hand analog thermistors have...
Forum: Conservation 02-14-13, 09:56 AM
Replies: 105
Views: 57,559
Posted By stevehull
This is GREAT news and you have done well by...

This is GREAT news and you have done well by hacking a control transistor to drive an output pulse.

Digital controls have incredible precision, but the analog world often is much faster. Chips...
Forum: Conservation 02-11-13, 02:27 PM
Replies: 105
Views: 57,559
Posted By stevehull
AC, A quick calibration can be the CO2...

AC,

A quick calibration can be the CO2 content of your breath at the end of expiration ~ 7%.
Forum: Conservation 02-07-13, 08:02 AM
Replies: 105
Views: 57,559
Posted By stevehull
worldtrekker, AC has a good sensor and it...

worldtrekker,

AC has a good sensor and it doesn't respond to humidity and temperature as do many CO2 sensors. All that said, we need to look at the total volume sampled (VERY small) inside a home...
Forum: Conservation 01-31-13, 02:45 PM
Replies: 105
Views: 57,559
Posted By stevehull
AC, I apologize. Been down the road you are...

AC,

I apologize. Been down the road you are going (sensing CO2) many years ago and was trying to give you some factual information on sensing variables.

Again, sorry about the...
Forum: Conservation 01-31-13, 10:24 AM
Replies: 105
Views: 57,559
Posted By stevehull
AC and gang, Good information on ERV vs HRV...

AC and gang,

Good information on ERV vs HRV graphics.

First off, homes rarely have any CO2 buildup as the inherent ventilation of a home is far more than a school, office or other work space. ...
Forum: Conservation 01-30-13, 02:16 PM
Replies: 105
Views: 57,559
Posted By stevehull
AC, I can guarantee that CO2 is not building...

AC,

I can guarantee that CO2 is not building up. Rather, "stale air" is out gassing of construction components, the infamous body odor, cooking smells, but by far the humidity is the dominant...
Forum: Conservation 01-29-13, 09:28 PM
Replies: 105
Views: 57,559
Posted By stevehull
AC, Using CO2 as a trigger for an HRV (or...

AC,

Using CO2 as a trigger for an HRV (or ERV) will not work as a reliable index of home air "staleness". Here is why . . .

The average adult at rest gives off about 200 ml of pure CO2 per...
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