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Old 01-29-13, 06:39 AM   #380
kostas
Helper EcoRenovator
 
Join Date: Dec 2012
Location: Venice, Italy
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Ham789 no upset at all, I apologize if I gave that idea

You are right about the measurements, I have a fairly good semi-professional thermometer / hygrometer (analog, not IR) but getting the right values is quite a task. But anyway I do not pretend to be 1000% precise, a 10% or slightly more error threshold is acceptable for my needs.
The data you see there were taken last October. The weather was mild at the time and there wasn't a big difference between internal and external temperature, so I used a hair dryer as hot air inlet and ambient air as the stale air. Regarding the PP solid core I've had these values:

T3 (hair dryer): 49°
T4 (HRV exit air): 45,7°
T2 (hair dryer outlet): 38,5
T1: (ambient air inlet): 21°

PP solid core efficiency: 88,2%



I do not have anything to measure the airflow yet, so I reported the fan's manufacturing values hoping that the're close to reality

Regarding the internal temperatures and dewpoint values I am planning to install 4 T/RH sensors cabled to an Arduino in order to log the report.
As far as I had already seen there was low condense inside, and that's because the exhausting stale air is quite dry (38% @21°).
For instance, yesterday's measurements were:
External fresh air: 3° @ 87% RH
Internal stale air: 21° @ 38%RH
Fresh air from HRV inlet: 18,9 @ 31% RH
No condense in the chambers.

Hope that helps.
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