Season 2018-2019

 

Please see the Calendar Page for future dates

 

 

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SO sorry  but our Feb meeting has had to be cancelled due to the Greenwich Tavern being modernised throughout February

 

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NEXT Meeting 

March  14th at the Greenwich Tavern   all very welcome

 

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On 10th January Mr Richard Metcalfe from   "ICS Cool Energy"

 presented a talk on 

"Free Cooling and Refrigerant Selection" 

follows the report from this very informative meeting " 

 

 

In 2015, 80% of the units tested, had a SEER rating lower than the Tier 1 rating that was originally to come into effect in 2017 and 88% of units tested was below the Tier 2 requirement set for 2019.  This means that much still needs to be done to improve energy efficiency. Lot 1 came into effect on January 1^st 2018

 

The SEER values are regulated by Regulation (EU) No.: 2015/1095 and Regulation (EU) No.: 2016/2281 for comfort and process chillers.

 

The direct contribution due to the use of refrigerants is far smaller than the indirect contribution of using electricity, therefore improving the energy efficiency of a system, must be a priority.

 

Brexit and Eco Design link to refrigerants

 

In the 1900’s refrigerated vessels predominantly used air, ammonia and CO₂ as refrigerants indicating that natural refrigerants have been used extensively for a long time whilst some went out of fashion others are making  a comeback.

 

The ErP (improve efficiency levels of chillers) and  F-Gas (reduce production to 21% of 2012 baseline) legislation and the Kigali agreement means that the UK have to continue with the F-Gas phase-out and the improvement of chiller efficiencies after Brexit.  

 

Alternative refrigerants include HFC, HFO, natural refrigerants and refrigerant mixtures.

 

A replacement for R134a includes the non-flammable HFO blend, R513A with a GWP of 631 or the A2L refrigerant R1234ze with a very low GWP of 6 offers the best efficiency levels with a short atmospheric life of 18days  

 

For R410A there is various alternatives on the market that is being tested including R32, R452B and R454B. These refrigerants all have various levels of flammability.

 

The replacement refrigerant options for R404a includes R449a, R448a and R452a.

 

R290 has similar properties as R22 but has a high flammability classification and isn’t really suitable as a retrofit.

 

When using R717, toxicity should be considered and copper can’t be used in the system.  Oil management is crucial since oil is heavier than ammonia and don’t mix well with ammonia. A R717 system is very miscible with moisture requiring special attention.

 

When selecting the appropriate refrigerant for a system, the impact on the environment, system efficiency and safety should be considered. The difficulty surrounding Brexit is if we move to a quota system which refrigerants will you put into your quota

 

Free Cooling

 

Traditional free cooling occur when fresh air is used for cooling in a HVAC application. In an application that requires cooling or conditioning throughout the year, the low temperature conditions can be used to help provide cooling during the winter seasons.

 

In London, an average of 7115 hours per year is below 16 ℃ and can be utilised to reduce energy consumption on chillers by up to 44%.

 

Free cooling can happen fully, where ambient air is used to provide the full cooling load, or partial free cooling can be employed where the initial cooling is done with free cooling and the rest of the cooling is supplied by traditional cooling.

 

In a system utilising free cooling, the free cooling will start once the ambient temperature becomes lower than the return water temperature

 

ICS COOL energy provides built-in options as part of a packaged product or with separate coils

 

 

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WEDNESDAY  5th Dec  @ 4.45pm

Our  combined meeting with the IOR was on

"Historical talk in the Canal museum"

 The Birth of the Refrigeration Industry in London:1850 to 1900

 The address is London Canal Museum,

New Wharf Road, Kings Cross, N1 9RT

14 of  us  LRS guys and gals joined about 50 IOR members at a very interesting meeting in the Museum who guided the keen to explore the deep centry's old Ice Wells afterwards.  I didnt make copious notes Sorry !

8 of us later visited a local restaurant for a beer and meal  to celebrate the coming Christmas festivities 

 

 

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8th November - Graeme Fox  of REFGas -

"the latest on Refrigerants"

 

Ref Gas was founded in 1994 to change and maintain the Standards in the Industry.  In 2009

The Refrigeration Industry regulations were certified by the government but much watered down from other European standards

 Graeme spoke   fully on   the legal requirements of gas handlers, emphasizing the mandatory importance of accurate keeping of log books for all systems over 3Kg on site and on line  (“in the cloud”)  obviously for all to access. At every visit to site.  Personal and Business registration is mandatory for the purchase of gases and working on systems.

Ref Gas have  a  free “Job Logic” app which  contains all gas tables  which will also produce graphs and spread sheets with relevant data.

The link for the flammables training courses through BESA Training is here.

 The links for the EN378 and F-Gas app is here for iPhones and iPads and here for android devices.

 We had 16 Engineers in attendance!    & we welcomed 2 new members who signed up.

After Graeme’s talk we held ou r Mini AGM where accounts were presented and approved. Our assets  are  £9456   at March 2018    Our loss on the past year was £ 525   The expenses including our monthly drinks bill and friends New Year’s meal  and London Walk  was £1218     We agreed to donate £200 to Prostrate Cancer research.   All current committee were re-elected and we welcomed  New Secretary  Miss Helena Potgieter to  our organization

 New members are always welcome and with membership fee remaining at £15 each good value .

Our next meeting is on Wednesday  5th Dec  @ 4.45pm 

It is a Joint meeting with the IOR  titled

 

The  Birth of the Refrigeration Industry in London:1850 to 1900

 

 We meet at The London Canal Museum, New Wharf Road, Kings Cross, N1 9RT please see our web site full data.   We look forward to seeing you there    -   please use the link to book a place

 

Regards Ron Filer

 

 

 

                           

 

 

 

 On 11th October - John Bawden  of Testo -presented

"Smart solutions for Refrigeration and AC Engineers!

 

On Thursday 11^th Oct 2018 (Mr Jon Bawden  of Testo Ltd  - Alton in Hampshire)  www.testo.co.uk) Jon gave an excellent presentation at our “Greenwich Tavern” meeting venue, on his worldwide company’s electronic testing products. These are designed for Refrigeration, Air Conditioning, and associated trades, and they all have memory recording of multiple types of temperature, pressures of 62 multiple gasses etc with blue tooth transmission to engineers phones tablets etc. in PDF format at 20 sec intervals!    Some devices also talk to the cloud to allow remote monitoring!

The pressure “gauge manifold sets” are very compact in sturdy carrying cases as are the leak detectors, Tor Gauges, Temperature monitoring Alarms, The Infra red  “thermal imaging camera” is excellent for finding hot spots on bearings, electrical relays and contactors, giving speedy maintenance on potential future failings.

Their web site www.testo.co.uk displays all products and prices and local suppliers to you who hold these very user friendly stocks. Their Facebook account has demonstrations of setting up and using their products.

They are also holding a free draw for various products until Dec 2018  go to www.testo.co.uk/en-UK/win/35and find out!

An excellent evenings display

We also welcomed 3 new visitors Niccole  Lenie and Jon.

 

 

 

 

Lens comments concerning the talk by TESTO 

 

We had an interesting talk given by Mr.Jon Bawden of Testo which was about the latest update from the manifold set. They now have sets of pressure and temperature sensors that can be read by Blue tooth to an App that can be downloaded onto an iPad or Android phone. Whereas the older style unit had to connected through hoses the new units are corrected directly to the system and can be read up to 10m away giving the information on a selection of 90 different refrigerants which are being updated regularly

The pressure sensors have ¼” connections which require an adaptor for 5/16”. The temperature sensors clamp onto pipe up to 1.1/8” but if larger pipe is on site the sensor may be taken from the clamp and strapped directly to the pipe. 

The true suction superheat is given taking into account any glide of the refrigerant.        Len Fiddler

 

 

 

 

 

A post note from Jon our speaker  

 

Something that your members might be interested in as well, we now have a dedicated landing page via

 

https://www.testo.com/en/applications/hvacr-refrigeration     

 

 for the testo range of refrigeration service instruments

 

Best regards - Jon       www.testo.co.uk 

 

   

 

  

+44 1420 544433                  

Newman Lane

Alton

Hampshire

GU34 2QJ

 

 

 

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 On Thursday 13^th September we met for the first meeting of this season at the Greenwich Tavern

Regretfully there were only 6 members in attendance to hear Mss Amy Gittoes of Artic Circle give her presentation  on ”Efficient Heat Reclamation” for Packaged Refrigeration Plant!

There has been  many styles of recycled discharge temperatures with in the trade ie  - heating air or water ,  Artic Circle has with great electronic controls given standby refrigeration plant a duty to heat larger areas efficiently and as  our last notification email said “Heating Car Parks”

With surface rain water now not allowed to enter sewage drains on new builds –surface water has to be returned to sub soil,  and car parks cause problems due to their large surface area. Porous surfaces are now being laid to allow water penetration and by laying water lines 50cm below (these discharging unwanted discharge temperatures from large refrigeration plant..

 Now it sounds complicated and you should have been with us to ask those relevant questions -as we did!

It was a gentle evening and if more information is required about these systems being installed by Morrison’s Tesco’s and Aldi look up Artic's web site  www.acl-online.com  or call 01432 273333 or Amy direct  at  This email address is being protected from spambots. You need JavaScript enabled to view it.

 

 

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       Our Next meeting  is on Oct 11th 2018   Join us if you can    See the Calandar page for full program 

 

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 We are a society of active refrigeration engineers with "hands on experience" , with a history going back 50 years; we meet socially during the cooler months for updates in technology, legislation and information on associated products.

Our current Venue is in South East London at The GREENWICH TAVERN , 1 King William Walk , Greenwich, SE10 9JH

We meet on the second Thursday iof the month from September to April from  7.30 till 9.30pm. The format of the evening is a speaker with Q&As to 8.30pm , society business / issues on sites / Technical Advice / social chat till 9 or 9.30pm. It is very informal, but if you visit our site you will see the calibre of speakers we attract. A great society for your staff to belong to.

We would like to invite you , your technicians, your trainees, and your managers to come and join us; you might find you will enjoy it as well as learn something !  Below I have attached a brief history and contact details, please call us if you have any questions.

A Brief History

The LRS was formed in the 1960's following the demise of the "Refrigeration Serviceman's Association". Its aims are to help engineers keep abreast of the latest developments in air conditioning and refrigeration. As the gasses Carbon Dioxide, Methyl Chloride, Sulphur Dioxide and Ammonia fell from grace, the wonders of those great "non smelly" "non flammable" and "totally safe" R12 and R22 compounds came into common use and our membership grew.    

The Society members in 1969 funded and organised the 1st "London Refrigeration Exhibition" at the White City Dog Track, which showed mainly components, then in '71 complete systems were displayed. In 1973 the Venue moved to Heston just off the new M4 where the British Refrigeration Industry and Hevac had their headquarters.

In 1975 it, like "topsy", had grown and with our very good friend Terry O'Gorman who was editor of the RAC magazine. Wembley Arena was taken over for the show area. As it was now a very successful (but time consuming biannual event), our dedicated committee members agreed that the "RAC magazine" took over the complete organisation and gave us joint sponsorship donations to assist our running expenses. In later years, the venue moved to The Agricultural Halls in Westminster.      All of these shows were great places to meet with competitors, and late nights in the west end of London were often the bonus of the successful shows.

We see that in the 100th Volume of RAC magazine in May 1998 a long article including photos of the show committee gave the LRS full credit for beginning this trade show, and we today must thank our predecessors for our heritage.

We are still "hands on" engineering folk interested in furthering our knowledge in Refrigeration and Air Conditioning Practices, and are affiliated to the Institute of Refrigeration.

Today the Society's committee still arranges eight "out of season" monthly meetings where we invite others with skills and information on "latest refrigeration developments, gas and oils, rules codes and practices, training, and health and safety regulations etc", to share their knowledge through discussion and open forum.

Our meetings are held on the second Thursday of the month, September through to April, and anybody within striking distance at 7.30pm can attend for just £15 pa. (or just receive our monthly emailed reports on the previous month's discussions)

We have supported the  RAC shows since their start up by our predecessors way back in the 1960's.  We have had exhibition stands where many new contacts are made and old faithful friendships are renewed, which seem to be a foundation of this great industry.

We hope, through the keenness of new comers to the trade, we will still be around for another 50 years, helping to pass on our knowledge, and encouraging suppliers and manufacturers to share their expertise / developments with the active guys at the sharp end!

 

CONTACT :

Ron Filer  (Hon Treasurer)                                       Brendan O’Reilly

91 Herongate Road                                                    c/o Blygold UK Ltd

Wanstead                                                                      Unit 1A, Corinium Ind Est., Raans Road,

London                                                                           Amersham,  Bucks.,

E12 5EH                                                                           HP6 6YJ

Phone:(home)   020 8989 7815                              01895 259346  Mob 07876 654319

This email address is being protected from spambots. You need JavaScript enabled to view it.                                             This email address is being protected from spambots. You need JavaScript enabled to view it.

 

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 Notes on 2017 to 2018 Season 

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Meeting notes on Thursday March 8th at Greenwich

We met with Blue Diamond Condensate Pumps

Full report will follow but their contacts and web site follows

 

UK-  BlueDiamond Pumps                                                                                                          

Royston Road, Byfleet, Surrey, KT14 7NY

tel: +0044 (0) 1932 355277   fax: +0044 (0) 1932 351285  mob: 0044 (0) 7392087272

e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.       web: www.bluediamondpump.com

 https://www.bluediamondpump.co.uk/home  

 

 

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Meeting on  Thursday Feb 8th   Joint meeting with the Institute of Refrigeration at the South Bank University Campus

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 Regretfully our December 2017 meeting has had to be cancelled at short notice  therefore our next meeting will be in 2018  Please attend if able 

 

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Dear friends of The London Refrigeration Society

Follows the report on Thu 9th Nov meeting    other Notes follow. please read on

 

Regretfully only 7 members attended our November meeting  to welcome

Mr Shane Leather from Armstrong Fluid Technology, a company

based in Manchester, Birmingham and London

"Armstongs" (not related to the insulation company of the similar name)  manufacture a comprehensive range of pumps,  pump control systems and Packaged Plant Rooms for the HVAC Industry.

            Shane explained that one of the main considerations within the HVAC is energy saving and carbon footprint reduction and well as the obvious cost factor. His presentation covered how traditional methods of pump selection and installation are now being challenged by more energy efficient and cost- effective pump selections, methods of installation and control strategies.

     Armstrong have just released to the HVAC market place their new Tango Twin pump,

         Shane explained to the guys present how Armstrong are challenging the conventional thinking and installation methods in the arena of parallel pumps and multiple pumping systems.

      By trying to move the consensus away from the traditional duty/standby scenario plus 15% safety margins being added on to the pump duties; to a more energy efficient installation of smaller pumps sharing a proportion of the load. This results in smaller pumps being installed, leading to a reduction in the size, weight and energy consumption of the electrical installation.        This also has a reduction in the carbon footprint of the installation of the pumps; This is due to the Armstrong's vertical in line method of mounting the pumps which does away  with heavy concrete inertia bases.      

    Armstrong’s manufacturing processes and the dynamic balancing of the pump impeller, combined with the pump body design allow Armstrong pumps of up to 450 kw. to be suspended within the pipework installation.

    This led into a discussion regarding pump redundancy and how smaller Armstrong pumps can actually increase the level of redundancy and maintain heating and cooling levels in the event of one of the pumps failing in the system.         

    This is due to the Armstrong strategy of selecting pumps to be at their most efficient at part load as opposed to theoretical full load.   Shane explained to us that typically buildings only reach full design load 5 or 6 days a year, while for approximately 60% of the year the plant is normally operating at 40-60% capacity of the installed HVAC plant. 

     It makes more sense to select a pump to be at its most efficient where it spends most of its working life.

The presentation moved on to the built in control strategy and Shane demonstrated that the Armstrong staged parallel pump control can save up to 36% in electrical running costs over a standard BMS controlled parallel pumping system.     This combined with the installation cost savings and low maintenance costs give Armstrong the grounds to claim that their pumps have the lowest whole life costs for HVAC chilled LTHW pumps currently available. 

      Full built in Electronics and remote internet control can anticipate many potential problems even gland leaks!

Armstrong also manufacture at their Halesowen (Birmingham) plant a comprehensive range of Packaged Plant Rooms specialising in chilled water and multiple boiler systems, modular packaged plant rooms for standalone buildings and district energy networks.

The talk generated much discussion from our members and we recommend you look at the benefits on their website www.armstrongfluidtechnology.c om . Shane can be contacted via 07896 691673  or sleather@armstrongfluidtechnol ogy.com  or post to "Armstrong Fluid Technology", 1 Wenlock Way,   Manchester,    M11 2ET.

 

 

  Long Serving member Phill Stark's cremation service is on 17th November at 1.30pm at East Hampstead Crematoruium: Bracknell: RG40 3DW   we agreed to send £50 to the charity “Crisis at Christmas” in his memory.

 

Our  December Meeting    Unfortunately we cannot meet at Greenwich but kindly Shane offered hospitably premises at their offices on Thursday 14^th December open at 7pm for a prompt 7.30 start @ The Adams Room

           We welcome you all to attend   The address so you can look it up is; 10 Fitzroy Square  London  W1T 5HP Please meet up there for the final meeting of 2017

 Warren Street Tube Station (Northern Line) is 150 yards away and there are numerous pubs around if you all wish to meet for a beer beforehand or afterwards.

14th Dec.   "Teslamiser – continuity of cooling for Data Centres”

Mr Tim Mitchell  of  Klimatherm

 

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Report on Meeting held Thursday 12^th Oct 2017

We welcomed Mr Richard Betts of RABScreen, a company based in Newbury, who provide the RABScreen washable air intake filter for Condensers and Air Handling units etc.

Richard explained that in every environment where there is air movement, e.g. chillers, cooling towers, air handling units etc, this air movement carries with it lightweight debris such as seeds, pollen, insects and leaves.

 

This in turn is drawn through the finning of condensers and the air filters provided in duct work.

The efficiency of plant is dramatically reduced and the cost of power rises too. 1mm of dust reduces efficiency of cooling condensers by 21% and can increase running costs by as much as 35%.

A RABScreen prevents this debris from being drawn into the air intake due to its inherently electrostatic properties.

This RABScreen is a flexible polyester and polypropylene mesh which can be made to any size or shape required which a multiplicity of fixing designs including magnets, drop tab fixings and the new KEDER profile.

The media is an engineered mesh using polyester and polypropylene. Polyester is negatively charged and polypropylene is positively charged which means that any air movement excites the mesh to create an electrostatic charge.

RABScreen filter mesh can be cleaned without removal by using a hose, vacuum or brush taking care not to push the debris through the filter. If using nitrogen or high-pressure water jetting this must be done from the fan side to drive debris through the coil and filter.

To minimise downtime a second set of filters could be used to allow the maintenance engineer to remove and wash one set whilst maintain optimum filtration with the second set. This is particularly relevant to high end production lines where any downtime can be costly.

RABScreen also produce what Richard called the ‘Air Net which is a circular filter that fits over the air intake fan guards. These filters use an elasticated or draw string border to make them quick and easy to remove and replace.

It is estimated that there are 47,000 chillers rated at 250Kw & above in the UK. Add to this figure the smaller cooling plant, condensers and individual cabinets on shop floors and you can see that a significant amount of energy is wasted by compacted coils. RABScreen filters have a typical ROI of 3-6 months on energy alone and can also significantly reduce labour cost, chemical use and filter changes 

The talk generated much discussion from our members and we recommend you look at the benefits on the website www.rabcreens.com . Richard can be contacted on 0800 999 5750 or  This email address is being protected from spambots. You need JavaScript enabled to view it.  

 

 

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 Report  on London Refrigeration Society meeting September 14^th 2017 

 

13 members 2 guests and our Speaker attended the first meeting of the season at The Greenwich Tavern

We welcomed Mr Z Ure of ECO MESH who gave a very descriptive presentation on Improving the efficiency of roof top condensers when subject to high ambient temperatures through poor circulation due to “protective” screens and close installation of other condensers and buildings.

Descriptive visual screen shots of installations at home and abroad were explained (which can be viewed via www.ecomesh.eu ) 

The history of this is based on hot countries hanging damp hessian across windows to cool incoming air!

Basically the “AIR OFF “ of one condenser is trapped or recirculated by drafts or by adjacent installations. This heated air is induced into the “AIR ON” causing excessive head pressures and failures.

Ecomesh solution is to install triple layer “curtains” approx. 500mm from the air on fins of the condenser and spraying electronically controlled untreated mains water onto the mesh.   This Adiabatic system cools the “air on” when demanded; its mesh also traps dust, leaves, etc from fouling the coils. And in Winter snow conditions raises air on temperatures too!

Traditional emergency solutions are to put a garden spray onto the condensers - but this causes Salts, Verdigris, etc to foul the condensing areas giving expensive maintenance problems.  By electronically regulating the water flow as demanded by air on sensing – water consumption can be 75% reduced and when in use up to 25- 30%  greater efficiency achieved in the Cooling system.

These screens are installed by the end user contractor. Installations include Sainsbury, Tesco, Morrison,  Asda and many companies  overseas.

 

Please look up their website if you clients suffer this common problem on ever increasing crowded roof space. I’m sure Ecomesh will be pleased to advise 

 

Ron Filer 

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Minutes of the final meeting of the 2016/7 season which was held on Thursday April 13th  

when 16 of us gathered at Farringdon Underground station for our now traditional London walk.

       Stan Medland our guide led us past many public houses overflowing with drinking office workers spilling out onto the pavements of old London outside the city walls. Walking around Spittlefields, Barts Hospital, Smithfield Market and centuries old churches. Schools museums and monasteries, then passing the excavation sites of Cross Rail Railway construction.  walking many roads and back ways I had never visited before. Very interesting and full of details to keep us entertained for 2 hours. We finished at a noisy hostelry for a end  of season drink.

 

    ( Look out for our next season's program resuming in September, which hopefully will magically appear due to the dedicated work of " BK " This is now published on our Calendar Page)

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Minutes of London Refrigeration Society meeting on March 9^th 2017

 

13 members welcomed Mike, Tim and Rob from Gree UK who presented their companies history and plans for the future.

Gree UK are based in Wimbledon SW19 and the parent company is the largest A/C company in the world. Their Chinese Hong Kong, owned Company have depots in 200+ countries. Their 70,000 employees design, manufacture and service all the components in their systems. The 2 stage Compressors used in their systems are  Hitatchi and there are currently around 5.5 million Industrial and 60 million residential units

Their systems are fully fitted with inverters and diagnostic logic to commission and fault find these 7 year guaranteed systems.  These are sold to contractors who have undertaken and passed Gree’s installation courses

Built in to their control logic is Sola Panel Power generation technology; Converting from DC to AC  which will, in milli seconds select best power saving be it mains or free sola energy.  If the sola energy is over generating, feed surplus back into the grid system or divert into over battery storage! It was stated that Sola panels are light (not necessarly sun) generated and efficiency is reduced in ambient over 50C as are dirty panels etc .   Systems are built to work and tested in ambient temperatures of -28 to +30 C - Gas used is r410a

Graphs were shown which indicated the steep use of sola power uptake since 2006 in GB also the many quality Certification awards Gree have from around the world

Heat pumps too are part of their AC industry and Air to Air systems are preferred as ground source heat extraction very expensive to build in to refits. 

Gree Technical support can easily be found via www.gree.uk.com   020 3376 3533 or email This email address is being protected from spambots. You need JavaScript enabled to view it.

 

 

 

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 Minutes of Meeting for February 9th 2017

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Minutes for January 2017

The first snow of 2017 arrived  and so did  9 members who braved  it to the Greenwich Tavern 

As did our speaker

Mr Barry  Morris of  “ Chalmor – Experts in Energy Saving Lighting and Heating”

Who gave a most informative and interesting talk and presentation on their 35 years of expertise!

Concentrating on Schools Warehouses and Hospital etc Barry explained how technology has improved in savings on capital costs and energy consumption. Also how zonal control of unoccupied areas can either be dimmed or switched off automatically easily

Explaining how shops and show rooms demand good lighting levels but with technology colour LEDs can give enhanced white light or warm feeling illumination at reduced costs to traditional Fluorescent lighting.

There are grants, business loans and incentives to meet legislation on fuel economy and carbon emissions.  Chalmor are well respected to produce competitive quotes showing alternative solutions to suit budgets and pay back demands.

Barry said that badly installed LED lighting can produce Glare, Migraines, and poor product illumination .  Chalmor do not install but their quotes on design and product selection includes their well trusted installation partner companies: or customers can use their own trusted companies

Chalmor can be contacted by visiting www.chalmor.co.uk  their HQ is in Luton, Beds and phone contact is 01582 748700  or call Director Barry direct  This email address is being protected from spambots. You need JavaScript enabled to view it. Mob 07967 192899          

  If you or your contacts are interested please mention the LRS 

 

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London Refrigeration Society minutes of 8th December 2016

 

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London Refrigeration Society minutes of 10th November 2016

    The Information provided on Alan's presentattion has been made available in a DropBox - please follow this link if  you can www.ecocooling.org or visit Evaporative Cooling

 

 

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On Thursday 8^th September 2016;

 

15 of our members met at the Greenwich Tavern for the first meeting after the summer break.  We welcomed Mr Luke Jones of Air Flow who presented their range of fans from 6” window mounted units to major air handling systems

 

Luke moved on to explain why we need ventilation, we all need to breath ‘fresh air’ and as humans we all exhale a lot of moisture, we need the air changed regularly to maintain a reasonably dry environment both for our own health and for the environment as it limits the growth of mould and fungus's

 

MVHR (Mechanical Ventilation with Heat Recovery) was now presented as a heat exchange unit which provides fresh air at a temperature approaching that of the conditioned space either as backup for the heating or cooling systems or as the main source.  The air is filtered coarsely to stop bricks and bugs, both in and out of the building with an additional #7 grade (Virtually Heppa) screen to limit spores, micro organisms and fine dust into the conditioned space.

 

The unit will cut off if the air passage becomes restricted with blocked filters and the integral controller will send a signal to the user/owner/maintenance and to Airflows office where it is monitored it to ensure it is cleaned.

 

Additional components that can be supplied include duct heaters or coolers to temper the air supply to give the desired conditions.  A ‘Summer Bypass’ allows the filtered air to miss the heat exchanger and give free heat/ cooling where the external ambient is closer to the desired conditions than the exhaust air.

 

Selection is based on maximum occupancy with 2 or more speed fans to minimise energy consumption.

 

With the European regulations all energy consuming products have to be rated, A to F dependant on the normal operations consumption.  The regulation is not policed but Air Flow thinks it should be complied with and DEFRA would be the ideal body the administer it.

A need has been identified to stress the requirement of ventilation in domestic dwellings and for this to be considered at an early stage in all new developments.

 

Many large engineering companies produce ventilation products as an addition to their main portfolio while Air Flow specialist in ventilation with only one or two other major players in the same discipline trying to police the whole industry.

 

The European Regulation also requires all buildings to be given an A to F rating, again with A as the best.

 

Germany has adopted a ’Passive Building’ approach where there is minimal interaction with the outside environment; with a required efficiency of 75% whilst minimising energy consumption and cost.  This means the air tightness must be very high which means internal ventilation is required with efficient heat transfer.

 

Crossover heat transfer units previously used gave poor thermal efficiency, better were the thermal wheels which gave lower pressure drops or used less energy with a reasonable Thermal Efficiency but gave cross contamination between the air flows.

 

The option just presented is the Counter Cross Flow unit which works like two cross flow units feeding each other so that there is no contact between the two airflows.

 

The fans are Electronically Commutator (EC) controlled as opposed to AC (alternating current) the EC fans are fixed speed, set by the manufacturer and are completely sealed.  (EC motors are brushless DC motors with external electronics. The rotor contains permanent magnets and the stator has a set of fixed windings. A circuit board continually switches the phases in the fixed windings to keep the motor turning. Because the speed of the motor is controlled by the commutation electronics, these motors are not limited to synchronous speeds. Appliance design)

 

Integral CO2 and H2O sensors are provided to allow ‘boost’ when required which is useful for areas with intermittent use, Kitchens, Offices or Schools.

 

In multiple or varied use buildings either individual units can be supplied for each area or one or more major unit ducted throughout with damper control  managed by a BMS function which can be set up to be monitored remotely by ‘phone; tablet of PC.

 

To give an idea of the cost a four bedroom with a central unit, fully ducted would cost around £4,000.

 

A ducted system usually aims to have the supply in one corner of a dry room and extract from a wet one (Bathroom/Kitchen/Shower/WC) with undercut door or similar.  The external intake and discharge are designed to be at least ½m apart but preferably on different building faces.

 

After our usual “half time tea break” Luke answered many varied questions. Our Chairman warmly thanked Peter and presented him with “full bottle” as a small token of appreciation.

 

During the general conversation that followed Lee raised the question of domestic A/C stating ‘Do not buy cheap because of the noise nuisance which may be present.  The main causes are

A               The sound of running water caused by the liquid refrigerant trickling into the evaporator.

B               Condensate pumps               they are never quiet

C               Fan noise the on/off causes nuisance.

Remedies include  

external mounting avoiding other dwellings,               gravity drain condensate                acoustic insulation and possibly more.

 

If you have a question of these about air movement and fans please look up their comprehensive web site www.airflow.com or email This email address is being protected from spambots. You need JavaScript enabled to view it.

 

This email address is being protected from spambots. You need JavaScript enabled to view it.

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