Dan
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Posts: 96
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« on: August 08, 2009, 06:28:51 PM » |
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After Julys poor results it looks like august could be better than June
TDC3 turned off the pumps at approx 1400hrs ( bot reached the limit set on TDC3@75C) and the panels temperature was as high as 140C (stopped looking) . The temp got high in June but it never reached the limits and turned the pumps off.
172L East west with 20x47 on each side.
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« Last Edit: March 06, 2010, 09:40:40 AM by Paulh_Boats »
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try all things at least once
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Greenbeast
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« Reply #1 on: August 08, 2009, 11:35:41 PM » |
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i have my max set at 90C, that's an extra 15C you're missing out on!
but yes, august is better so far
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sjaglin
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« Reply #2 on: August 09, 2009, 06:54:53 PM » |
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Yes August is not as bad as July so far, I am on target but it is early days. 70 degrees regularly so far top to bottom. About 60 kWh produced on the PV so far... Stef  |
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rob26440
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« Reply #3 on: August 09, 2009, 09:14:57 PM » |
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I was going to post my kWhs chart for Aug 07 through to Aug 09 but it doesn't want to know. Probably doing something wrong but its a .doc of 26k so should work.
Anyway, July wasn't bad for me - just about the same as last year. Aug is setting off better than July and if it carries on like this it will easily outstrip Aug 2008 - which was a bad month.
If someone can tell me how to post the .doc I'll post it!
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S/E England. 30x58mm tubes, S/W facing 40deg pitched roof, 216L primary and 184L secondary cylinders, TDC3 with home-made, separate controller to switch between cylinders, 15mm tubing with min 25mm insulation.
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martin W
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« Reply #4 on: August 11, 2009, 06:45:12 AM » |
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Sunday the heat dump came on... 3 days of good (not brilliant, but good) sunshine and wife here all day (so normal water usage) and the cyllinder reached 80°C. We went away twice in june/july (3 days and then 5 days) so no water usage and the heat dump never ran.... goes to show how bad the sunshine was in our summer months - bring on september  . |
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Woodstove Newbie since Feb 2011  (yes it's finally off the pallet) Solar Water Heating since 17th March 2009 Chicken Owner - Self sufficient in chicken c*@p, boy watch those tomatoes grow. Now an allotment wannabie |
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Ivan
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« Reply #5 on: August 11, 2009, 10:18:57 PM » |
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My washing machine experiments are using huge quantities of hot water. Assuming it's around 50litres pf water per wash, I managed to empty the cylinder the other day - 3x50litres for washing machine, 1x20litre dishwasher, 2x20litres kids bath, 1x15litre plus 1x30litre showers....that's 235litres out of my 260litre cylinder. Before the water was consumed, base of cylinder was 85C. When I had my shower (15litre), the water was decided cool - I checked the cylinder and at the TOP it was only 39C. By this morning, after breakfast (and some dishes washed/ morning washing etc) it was down to 37C at the TOP, and 23C at the bottom (probably mostly 23C). By this evening, we'd hit almost 80C again. Not bad for a single day's solar gain.
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rob26440
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« Reply #6 on: August 11, 2009, 10:40:55 PM » |
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Ivan,
Are your volumes of hot water for each of the types of use based on estimates or do you have a water meter on the input to the cylinder? I'm contemplating fitting a meter but they appear to be 15mm jobs and I don't want to reduce the flow into the cylinder from the header tank, which is on a 22mm feed. With a low head of water, that would lead to ugly scenes!
Rob.
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S/E England. 30x58mm tubes, S/W facing 40deg pitched roof, 216L primary and 184L secondary cylinders, TDC3 with home-made, separate controller to switch between cylinders, 15mm tubing with min 25mm insulation.
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Ivan
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« Reply #7 on: August 24, 2009, 01:36:50 AM » |
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Rob,
Nope, my figures are estimates - but I think they're realistic.
I too have been thinking of fitting a water meter to monitor my hot water usage. Here's a suggestion that would get over the problem: Assuming you don't have anything running directly from the cold water storage tank except the hot water cylinder (that's the case in my house) - why not fit the water meter to the rising main supplying the cold water storage tank?
P.S. Some forum members have ALREADY fitted flow meters to their hot water supply - would be interesting to know if they had pressure drop problems.
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kristen
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« Reply #8 on: August 24, 2009, 08:28:17 AM » |
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My DHW is mains pressure, so maybe different scenario, my meter is on the cold feed (before the branch to the mixer valve after coil).
My meter reads to 1/10th Litre, would resolution be OK if you have to wait for ballcock to drop far enough to activate?
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Greenbeast
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« Reply #9 on: August 24, 2009, 08:51:10 AM » |
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Well the water still has to pass the meter, whatever goes out (of the tank) must come back in
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Justme
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« Reply #10 on: August 24, 2009, 09:07:21 AM » |
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What about TMV's?
Ok you will be metering the pure hot water but not the total volume of water used out of the hot supply.
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Navitron solar thermal system
30 x 58mm panel 259L TS
1200watts solar 120vdc
FX80 Solar controller
Victron 12v 3000w 120a
200w (250w peak) 12v turbine as a tester
6kva genny
6 x 2v cells 1550amp/h 5C
24 x 2v cells 700amp/h 5C
Total bank 4350 amp/h @12v
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kristen
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« Reply #11 on: August 24, 2009, 09:28:27 AM » |
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"Well the water still has to pass the meter, whatever goes out (of the tank) must come back in"
Indeed, but possibly not with a resolution decent enough to know what when into a single wash cycle; would be accurate enough L/day though.
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rob26440
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« Reply #12 on: August 24, 2009, 10:32:01 AM » |
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My plan would be to fit the meter on the dedicated supply from the cold water header tank to the DHW cylinder then it will only measure the hot water used. But the siting of the meter (in the loft) will be awkward for regular checking. Need a 22mm pulse meter - or a 22mm H/W capable meter that I can fiddle into the airing cupboard (not going to be easy).
Getting back to the August figures. I'm already slightly up on the heat gain for all of Aug 08 - and still a week to go. But 4.5% down on the period 01 Sep 07 to 23 Aug 08 in comparison to 01 Sep 08 to 23 Aug 09. Will post the month by month charts for the 2 years at the end of the month.
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S/E England. 30x58mm tubes, S/W facing 40deg pitched roof, 216L primary and 184L secondary cylinders, TDC3 with home-made, separate controller to switch between cylinders, 15mm tubing with min 25mm insulation.
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Greenbeast
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« Reply #13 on: August 24, 2009, 10:36:32 AM » |
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I ought to start taking readings i guess, rob do you have data logging hardware or are you taking manual readings?
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rob26440
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« Reply #14 on: August 24, 2009, 10:46:24 AM » |
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Manual. Getting v. tedious. Have been thinking about 1 wire but still not done anything about it. Really just want a simple low power consumption "box" that can take the info from about 10 to 12 sensors (mainly PT1000), store it on an SD/XD card and then I download it onto my laptop and analyse it with Excel. Ericw has posted a link to the Logomatic product but it still looks like I will need to do some techy stuff - & maybe some config/coding - and I'm not really interested in all that. Had enough of it after 36yrs in IT.
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S/E England. 30x58mm tubes, S/W facing 40deg pitched roof, 216L primary and 184L secondary cylinders, TDC3 with home-made, separate controller to switch between cylinders, 15mm tubing with min 25mm insulation.
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