Zwembadonderhoud for dummies : 1 – Introductie

Het leuke van ons nieuwe huis is dat het vol zit met leuke extra’s zoals domotica en een zwembad. Ik was een beetje huiverig voor zwembaden (“duur, vreet energie, veel onderhoud, patserig”) maar volgens de keurmeester van het zwembad, die we hadden ingehuurd voor de koop, was hij degelijk gebouwd en was onmiddellijk (duur) onderhoud niet te voorzien. Toen vond ik het eigenlijk ook best wel een leuk idee, een eigen zwembad.

Van zwembaden wist ik eigenlijk nog niets dus moet er flink veel over gelezen en geleerd worden. Ik vind dat er erg weinig goede info te vinden is op het web die ook nog eens weinig consistent is. In het volgende feuilleton: wat ik tot nog toe wijzer ben geworden.

Eerst maar eens de specs van ons zwembad:
– een 8 x 4 x 1,5 meter diepe gemetselde bak, gevuld dus 48 kuub.
– of het gemetselde piepschuimblokken zijn weet ik nog niet, ik hoop het inmiddels wel
– blauwe folie (“liner genoemd”)
– een blauwe lamellenafsluiting, elektrisch aangedreven
– een overloop (skimmer) met mandje (bladvanger)
– 2 inspuitpunten
– 2 zonnecollector verwarmingsmatten (op de erker), kapotgevroren

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Een tuinhuisje (bij een villa noem je dat “poolhouse”) met daarin
– een zwembadpomp die 12 kuub per uur kan pompen (aldus het label)
– een eng uitziende megaschakelaar met een zwenk-arm (“6-standen regelaar”)
– een zandfilter (diameter 64cm)
– een roestvrijstalen buis met daarin een defecte UV-lamp met urenteller.
– kado van de vorige eigenaar : emmers met chloorblokken, pH+, pH-, vlokmiddel en wandreiniger
– stofzuiger mond, slang stang.

Bij de overdracht bestond de instructie ongeveer uit “zo gaat de pomp aan, zo gaat de pomp uit”.
Het was juni, dus de pomp maar aangezet want we zouden snel gaan zwemmen.
In de derde week toch maar eens gekeken hoeveel de pomp eigenlijk gebruikt. Dat bleek 630 watt te zijn (met verbruiksmeter gemeten). Oeps. Dat is dus 24 uur x 0,63kW = 15 kWh per dag x 0,2€ = € 7,50 per dag aan stroom. Slik. Snel uitzoeken hoe lang je eigenlijk moet pompen. Voor gezond zwemwater wordt geadviseerd om het volume van het bad 2x per dag te filteren. Aha, 48 kuub / 12 kuub per uur (van de pomp) is 4 uur voor 1 x filteren, dus 8 uur per dag is genoeg! Dus snel een schakelklok ertussen. Dat scheelde gelijk 2/3!

Morgen : De zes-standen schakelaar
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MOOC Refelctions : Climate Change, Exeter, week 1

How cool is that! My First ever MOOC, and the first thing they tell me is that I have to write blogs and tweet about them! I love to write blogs! ha!

So here we go, my first reflections on “climate-change-challenges-and-solutions”

What is the difference between weather change and climate change?

Weather, in my part of the world, The Netherlands, changes on a daily basis. Yet streams transport low and high pressure systems across the Atlantic and bring wet & windy weather when the wind blows from the west, cool and wet when wind blows from north, cool and dry when from the east and soft and wet when blowing from the south. The yet stream is the motor of weather changes.

“Climate” used to be the average measured, by definition, over a period of 30 years. Looking at these averages you could tell that winters were soft and wet, springs usually pleasant, summers comfortable, and autumn wet and windy. These averages show a lot of variability leading to winter periods with frost and snow (skating!!!) and sometimes semi tropical summers.

What I see changing in my lifetime is that the variability both in weather AND climate are changing:
– weather patterns get stuck : weeks on end with northerly winds, switching to weeks on end of southerly wind. Huge downpours, unknown since measuring began in the 1700’s, dried out dikes because of lack of rain. All weather phenomena.

With the changing of the weather (freak events every month, we just had the three “hottest” January days ever recorded) we see a changing of the climate: spring starts sooner (second week of January and we still see flowers), autumn ends later.

The relationship between the changing of the weather and changing if the climate was one of the reasons to enter this MOOC. I’ve done a lot of reading, and I think the culprit is the yet stream that is powered by the temperature difference between the equator and the poles. Because the poles (at least the arctic) heats up a lot faster than the equator, the delta-T gets smaller! and the motor behind the yet stream fails.

Time to discuss now, please do!!

World Energy Outlook 2013 – What it doesn’t say

Today the International Energy Agency delivered its World Energy Outlook, edition 2013 . One picture says more than a thousand words, they must have been thinking, because we get loads of Powerpoint sheets and pictures. All this work just to report that it’s business as usual, although there are some issues requiring our attention.

The report itself is available for €120, even though all the IEA’s work is payed by us, the tax payers. I will leave this shameful practice for what it is, because there is more important ranting to do. On page 5 of the press information kitt we find:
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You see, we have this little issue with the Philippines. In order to prevent the Pacific from starting to boil, there is a growing consensus that something needs to done about the rising (sea) temperatures. The world community seems to agree that we need to have some sort of “carbon budget” that we must not exceed in order to prevent temperatures from rising 2 degrees above pre-industrial levels. The picture above tells this story.

“Nice pie chart”, I thought. But than I looked again and saw this “1750-2011” label. Wait a minute! Is this pie chart really showing all the carbon ever used since James Watt invented the steam engine?Wow! The yellow slice is all the carbon that “we” will use between now and 2035, it’s our “budget”. The other slices are all the carbon used in history PLUS all the carbon ever to be used by mankind after 2035. I think that that story needs more detail than a three slice pie chart. I created the graph below with data from Carbon Dioxide Information Analyses Center:

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(Reduction of CO2 emissions by 0.5% per year after 2012; 1/12 of CO2 budget remaining for all future generations.)

Inconvenient isn’t it? More than half of all the carbon dioxide mankind will ever emit will be from the generation now alive. All the cars, coal plants, holiday trips to the tropics, summer air conditioning, just-in-time production schemes, warehouse on wheels invented in the 70’s-80’s-90’s are using 2/3 of all fossil energy ever to be used by mankind. That is our generation doing this, we created this mess, we signed the climate contract with the planet blindfolded, we accepted the consequences.

The contract says we will leave as much fossil fuel (for heating homes, cooking and maybe even some driving) to our children as our (grand) parents used in the 50’s and 60’s of the last century.

I think that the whole WEO report can be binned and replaced with just one line of text:

Stop burning fossil fuels now!

Isn’t it a reassuring idea that our governments are using the WEO-report as a primary source for energy (let alone climate) policy decisions? Give your kids a good hug tonight, it may be all the warmth they get in the rest of their lives.

Ps. As Manjana Milkoreit (@ManjanaM) pointed out, the IPCC has calculated that our generation will actually burn ALL the remaining carbon budget before 2035, so “My” graph is highly optimistic, in leaving something for our kids and grandchildren.

Pps. This article went viral on Twitter today, and I felt a little uncomfortable about my guesstimate chart below (including typo) that was in the original version of this post. I am happy that my gut feeling was so much in line with real historic data:
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Pps.
Others have used information in this article to write own blogposts!
Mark Trexler
Paula Reed
David Appell

other articles in English on this site (the rest is in Dutch)

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