[89attendees] cold rooms

Jakob Heitz <jakob.heitz@ericsson.com> Tue, 04 March 2014 00:51 UTC

From: Jakob Heitz <jakob.heitz@ericsson.com>
To: Alia Atlas <akatlas@gmail.com>, Alexa Morris <amorris@amsl.com>
Thread-Topic: cold rooms
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Date: Tue, 4 Mar 2014 00:51:18 +0000
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Subject: [89attendees] cold rooms
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I once built a control system for a mushroom farm.
Had to control humidity and CO2 as well. No CH4, luckily mushrooms don't produce that.
I had the same problem with temperature. Multiple rooms sharing the same cooler, making the loop highly non-linear, thus hard to control.
Solved it by adding a temperature sensor in the air as it exited the heat exchanger and using it in a cascaded loop.
This confined the non-linearity to a fast loop, leaving the slow loop linear. Worked much better.
Maybe someone can tell the HVAC company.

Cheers,
Jakob.


From: 89attendees [mailto:89attendees-bounces@ietf.org] On Behalf Of Alia Atlas
Sent: Monday, March 3, 2014 12:16 PM
To: Alexa Morris
Cc: 89attendees
Subject: Re: [89attendees] not enough mikes?


Alexa,

Thank you very much!  I know temperature is hard to adjust with variable numbers of people in the rooms too.

Alia

[89attendees] cold rooms Jakob Heitz
Re: [89attendees] cold rooms Barry Leiba
Re: [89attendees] cold rooms Jakob Heitz