sezze Posted January 16, 2011 Share Posted January 16, 2011 (edited) Hi , I'm going to build a solar water heater . The standard and cheapest systems are working with a pressureless tank , with a thermosyphon system . This is no problem . However , since it is pressureless , it s normally placed on the roof . This is a no go because of several reasons and one of them is that the pressure provided would still be nearly nothing . So , since i got a much better position on floor ( solarangle and looks) this is a very viable option . The only problem then is to get the water , which will be hot , to the inside of the house with more or less the same pressure as the standard pump ( mitsu ) . Are there readily available pumps present who have no problem pumping water which have a temp of 60degrees or a bit more . I guess the standard mitsubishi or Hitashis will be broken quite fast . THX . Edited January 16, 2011 by sezze Link to comment Share on other sites More sharing options...
InterestedObserver Posted January 16, 2011 Share Posted January 16, 2011 I'd get a pump specifically rated for hot liquids. The pump shift seal and motor windings will be subjected to elevated temperatures? As you say, the thermosyphon system uses a pressureless storage tank so you need something to get the hot water inside your house. Link to comment Share on other sites More sharing options...
sezze Posted January 16, 2011 Author Share Posted January 16, 2011 I'd get a pump specifically rated for hot liquids. The pump shift seal and motor windings will be subjected to elevated temperatures? As you say, the thermosyphon system uses a pressureless storage tank so you need something to get the hot water inside your house. Well , that was the original question , wasn't it . I do have enough technical knowledge to figure pump ratings out , that's not the issue . The issue is which one is available in Thailand at a reasonable price . Link to comment Share on other sites More sharing options...
Artisi Posted January 17, 2011 Share Posted January 17, 2011 I'd get a pump specifically rated for hot liquids. The pump shift seal and motor windings will be subjected to elevated temperatures? As you say, the thermosyphon system uses a pressureless storage tank so you need something to get the hot water inside your house. Well , that was the original question , wasn't it . I do have enough technical knowledge to figure pump ratings out , that's not the issue . The issue is which one is available in Thailand at a reasonable price . Well with a reply such as this, you might be waiting quite awhile on an answer. Link to comment Share on other sites More sharing options...
Naam Posted January 17, 2011 Share Posted January 17, 2011 i am using since three years a normal pool pump (½ HP = ~365 Watts) which handles 90ºC hot water (run time continously 3-4 hours daily) without any problems. but in addition you have to solve is the problem of getting equal pressure/flow for your hot and cold water. Link to comment Share on other sites More sharing options...
sezze Posted January 17, 2011 Author Share Posted January 17, 2011 I'd get a pump specifically rated for hot liquids. The pump shift seal and motor windings will be subjected to elevated temperatures? As you say, the thermosyphon system uses a pressureless storage tank so you need something to get the hot water inside your house. Well , that was the original question , wasn't it . I do have enough technical knowledge to figure pump ratings out , that's not the issue . The issue is which one is available in Thailand at a reasonable price . Well with a reply such as this, you might be waiting quite awhile on an answer. Hmm , sorry . I did not want to offend anyone . However , i gave the original story and i was happy with the respons but that were just the facts again . It is just me ... do not worry about it .Maybe somebody had/has a same problem in the past or works with a different pump then the standard Mitsu /Hit who are capable of the higher temp ratings . i am using since three years a normal pool pump (½ HP = ~365 Watts) which handles 90ºC hot water (run time continously 3-4 hours daily) without any problems. but in addition you have to solve is the problem of getting equal pressure/flow for your hot and cold water. This answer gives me something to look for . 90 is hotter then i want the hot water to be anyway , so a very possible solution . Equalisation might be possible by using smaller pipes , so the pressure might be higher but the flow is reduced ( like trying to fil up a bucket with a pressure washer or with a 2 inch pipe . The pressure will be high on the 1 side but by reducing the flow will end up roughly the same ( or enough to work with ). thx . Link to comment Share on other sites More sharing options...
thatguy Posted January 21, 2011 Share Posted January 21, 2011 If cost is a factor, you may still be better off with a tank that will take pressure. The last time I looked in Global House, a steel water tank used for pressure systems was about B10,000, You could run at street pressure, no outlay or maintenance for a pump, and no electric cost. Link to comment Share on other sites More sharing options...
sezze Posted January 21, 2011 Author Share Posted January 21, 2011 If cost is a factor, you may still be better off with a tank that will take pressure. The last time I looked in Global House, a steel water tank used for pressure systems was about B10,000, You could run at street pressure, no outlay or maintenance for a pump, and no electric cost. That is even handier , yes . I thought they were more expensive and difficult to find . For a homebuild solar water system it is by far the best solution . A solar system which is build by a company is from 14k for small , 20k for a non pressurised 180l , and 30k up for a pressurised . In Thailand i think you do not really need the high end solar systems for hot water . sheer surface and isolation will do the trick . THX a lot , this will certainly be looked at . Link to comment Share on other sites More sharing options...
Naam Posted January 24, 2011 Share Posted January 24, 2011 If cost is a factor, you may still be better off with a tank that will take pressure. The last time I looked in Global House, a steel water tank used for pressure systems was about B10,000, You could run at street pressure, no outlay or maintenance for a pump, and no electric cost. what street pressure? Link to comment Share on other sites More sharing options...
sezze Posted January 24, 2011 Author Share Posted January 24, 2011 If cost is a factor, you may still be better off with a tank that will take pressure. The last time I looked in Global House, a steel water tank used for pressure systems was about B10,000, You could run at street pressure, no outlay or maintenance for a pump, and no electric cost. what street pressure? Yeah i know , pump pressure will be more like it , it is the idea that counts . Link to comment Share on other sites More sharing options...
thatguy Posted January 25, 2011 Share Posted January 25, 2011 The pressure of the water as it comes from the street, as provided by the utility that supplies the water. In the US it usually is about a 40 foot head, so called because it is similar to a 40 foot water tower. http://en.wikipedia.org/wiki/Hydraulic_head I would imagine well systems shoot for nearly the same pressures. Link to comment Share on other sites More sharing options...
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