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Great title, isn’t it? Even better article!

It’s not my title or article but one composed and authored by the renowned energy efficiency management professional Vilnis Vesma.

Would you like you read it ?

As I received it an email I will post the relevant content then the actual email.

AIR WE GO AGAIN…

I have had some enquiries from readers about three products which claim to improve the efficiency of wet heating systems by removing ‘dissolved air’. Now I acknowledge that dissolved nitrogen and oxygen (if present in sufficient concentrations) will tend to come out of solution at typical boiler flow temperatures, especially at the pump suction where the pressure is lowest. The resultant air bubbles may affect heat transfer, but most heating systems will be fitted with automatic air vents through which any air escapes. At worst you might have to bleed the air manually but once it’s gone, it’s gone.

These de-aerators can be viewed in effect as another form of circulating-water treatment not unlike the branded detergent and antifreeze which I have written about previously. What should ring alarm bells is the dodgy science used to promote them, and their claims of 20-30% energy savings (if you want to know why such a claim is ludicrous, please see http://www.enmanreg.org/circwater/).

Here’s a copy of the actual email so you know I am not simply making it up!
From: Vilnis Vesma <vilnis@vesma.com>
Date: 13 March 2017 at 07:59:46 GMT
To: Philip Smith-Lawrence <prsl@XXXX.com>
Subject: Energy update: energy jobs; air removal; updated M&T training 
Reply-To: Vilnis Vesma <vilnis@vesma.com>

Good morning

MONITORING AND TARGETING

I spent much of last week updating the monitoring and targeting training course that well over 500 people, including many readers, have attended in recent years. The 2017 revision incorporates a substantial new section on the sorts of advanced benchmarking techniques that are made possible by submetering and automatic meter reading. The first outing for the new material is on the 23rd March at the Energy Institute in London, followed by Leeds on 27th April.

–o–

AIR WE GO AGAIN…

I have had some enquiries from readers about three products which claim to improve the efficiency of wet heating systems by removing ‘dissolved air’. Now I acknowledge that dissolved nitrogen and oxygen (if present in sufficient concentrations) will tend to come out of solution at typical boiler flow temperatures, especially at the pump suction where the pressure is lowest. The resultant air bubbles may affect heat transfer, but most heating systems will be fitted with automatic air vents through which any air escapes. At worst you might have to bleed the air manually but once it’s gone, it’s gone.

These de-aerators can be viewed in effect as another form of circulating-water treatment not unlike the branded detergent and antifreeze which I have written about previously. What should ring alarm bells is the dodgy science used to promote them, and their claims of 20-30% energy savings (if you want to know why such a claim is ludicrous, please see http://www.enmanreg.org/circwater/).

–o–

ENERGY MANAGEMENT JOBS

Feeling restless? See http://www.enmanreg.org/job-ads/.

–o–

Kind regards
Vilnis Vesma

P.S. Information on forthcoming training courses is at www.vesma.com/training

Degree Days Direct Ltd trading as VESMA.COM
Pound House
Market Square
Newent, Glos GL18 1PS
United Kingdom
+44(0)1531 821350

Have a great day.
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