bizzard Posted September 19, 2019 Report Share Posted September 19, 2019 2 minutes ago, Tash and Bex said: honey, if you want to have coitus with a rubber bath then fill ya boots, I don't have the correct equipment for same. That's a shame, think of the electricity you'd save, never mind the minimum of hot water needed. Link to comment Share on other sites More sharing options...
Alan de Enfield Posted September 19, 2019 Report Share Posted September 19, 2019 1 hour ago, Tash and Bex said: I think it is all controlled by an external plc, temp is monitored and if it doesn't rise above the preset point within a given timeframe it switches the immersion on to do so. Ah - so you have mains now , or, are you looking to power the immersion from the inverter ? Link to comment Share on other sites More sharing options...
Tash and Bex Posted September 19, 2019 Author Report Share Posted September 19, 2019 1 minute ago, Alan de Enfield said: Ah - so you have mains now , or, are you looking to power the immersion from the inverter ? Sorry to confuse, no I was describing the method of operation in a solar domestic hot water situation. I continue to not have hook up. substitute the heat source for diesel and it's pretty much the same deal though. 5 minutes ago, bizzard said: That's a shame, think of the electricity you'd save, never mind the minimum of hot water needed. yes, but at what cost! Link to comment Share on other sites More sharing options...
Murflynn Posted September 19, 2019 Report Share Posted September 19, 2019 3 hours ago, Tash and Bex said: indeed, it tells me of a lack of critical thought. I am perfectly fine with being told my ideas are not going to work, as long as when I respond with "why" the reason they give is "because nobody else has tried it" I might remind you of the title of the thread. Does any part of that title suggest that I want information on how to plumb a boiler in? Yet that is all I am getting. Nobody can give me a SINGLE argument for why "my" suggestion WON'T work, except to tell me it won't for a newbie you sure know how to make friends on this forum, don't you? do you really expect to receive constructive replies if you throw it all back in people's faces. .... reminder to self - go to ignore mode. 1 Link to comment Share on other sites More sharing options...
Boater Sam Posted September 19, 2019 Report Share Posted September 19, 2019 22 minutes ago, Murflynn said: for a newbie you sure know how to make friends on this forum, don't you? do you really expect to receive constructive replies if you throw it all back in people's faces. .... reminder to self - go to ignore mode. I already have done!I have found one muff to be enough over the years. Link to comment Share on other sites More sharing options...
Onewheeler Posted September 19, 2019 Report Share Posted September 19, 2019 (edited) You could save a second Webasto by putting a small c/f h/x between your existing Webasto and calorifier coil with a switched pump that feeds secondary side water around your bathtime tank (or bath). It would have no effect on the normal operation of heating the calorifier. Without doing the heat transfer calculations, maybe a metre or so of 10 mm copper tube on the secondary inside 15 mm plastic tube carrying the primary, the whole lot insulated and coiled. Martin/ Edited September 19, 2019 by Onewheeler Missed out some essential words! Link to comment Share on other sites More sharing options...
Boater Sam Posted September 19, 2019 Report Share Posted September 19, 2019 44 minutes ago, Onewheeler said: You could save a second Webasto by putting a small c/f h/x between your existing Webasto and calorifier coil with a switched pump that feeds secondary side water around your bathtime tank (or bath). It would have no effect on the normal operation of heating the calorifier. Without doing the heat transfer calculations, maybe a metre or so of 10 mm copper tube on the secondary inside 15 mm plastic tube carrying the primary, the whole lot insulated and coiled. Martin/ Coaxial plumbing is difficult to arrange, requires special tee pieces. Link to comment Share on other sites More sharing options...
Onewheeler Posted September 19, 2019 Report Share Posted September 19, 2019 2 minutes ago, Boater Sam said: Coaxial plumbing is difficult to arrange, requires special tee pieces. Plenty of c/f heat exchangers are home-made for brewing purposes. Just needs some imagination, and Bex doesn't seem short of that ? e.g. 10 x 15 x 15 tee at each end, with a short length of 15 mm Cu pipe into plastic fittings. Ream out the 10mm end so that the pipe will pass through. Link to comment Share on other sites More sharing options...
Phoenix_V Posted September 19, 2019 Report Share Posted September 19, 2019 why not a steel bath with gas ring underneath? 1 Link to comment Share on other sites More sharing options...
Boater Sam Posted September 19, 2019 Report Share Posted September 19, 2019 You would need a significant length of 10mm pipe to achieve sufficient surface area for heat transfer on the rate that a Webasto kicks it out. Nice idea but it requires more design than has been proposed. 10mm pipe is far too small for the required flow rate in the Webasto heat exchanger matrix. Link to comment Share on other sites More sharing options...
ditchcrawler Posted September 19, 2019 Report Share Posted September 19, 2019 On 18/09/2019 at 14:38, Tash and Bex said: a vented tank is at atmospheric pressure, it's vented! In a house situation if its at atmospheric pressure how does the hot water get out? I know, why not have a plastic tank full of cold water that you heat up when you want a bath and then pump it into the bath from the tank, you could have it open so it doesn't pressurise, Maybe you could heat it with a diesel fired heater, something like a Webasto Link to comment Share on other sites More sharing options...
Murflynn Posted September 19, 2019 Report Share Posted September 19, 2019 (edited) when I was a kid we lived in a caravan and I had a bath once a week. tin bath on the kitchen floor, water heated in a big preserving pan on the twin gas ring. times was 'ard in the 50's. as me mum used to say - "did you no 'arm, lad." Edited September 19, 2019 by Murflynn Link to comment Share on other sites More sharing options...
Paul C Posted September 19, 2019 Report Share Posted September 19, 2019 When I was a kid the hot water/central heating thermostat was crudely controlled to switch on/off twice a day, at set times, rather than being customisable over the week with variable temperatures, linked to weather forecasts, and linked to mobile both for geofencing control and manual override. Link to comment Share on other sites More sharing options...
tree monkey Posted September 19, 2019 Report Share Posted September 19, 2019 9 minutes ago, Murflynn said: when I was a kid we lived in a caravan and I had a bath once a week. tin bath on the kitchen floor, water heated in a big preserving pan on the twin gas ring. times was 'ard in the 50's. Bath; on the floor, luxury , I was dunked in the sink after the dishes were done Link to comment Share on other sites More sharing options...
Onewheeler Posted September 19, 2019 Report Share Posted September 19, 2019 33 minutes ago, Boater Sam said: You would need a significant length of 10mm pipe to achieve sufficient surface area for heat transfer on the rate that a Webasto kicks it out. Nice idea but it requires more design than has been proposed. 10mm pipe is far too small for the required flow rate in the Webasto heat exchanger matrix. I said I'd not done the heat transfer calcs. However, a flow rate through the 10 mm secondary of 2 L / min with a delta T of 40 C would take 5.6 kW of heat. Based on experience with a very differently configured heat exchanger I use for cooling wort with about 1 m of 10 mm pipe, the heat transfer rate probably isn't miles adrift. Link to comment Share on other sites More sharing options...
Tash and Bex Posted September 19, 2019 Author Report Share Posted September 19, 2019 4 hours ago, Murflynn said: for a newbie you sure know how to make friends on this forum, don't you? do you really expect to receive constructive replies if you throw it all back in people's faces. .... reminder to self - go to ignore mode. My attitude is rather reflective, and I choose friends with care, please feel free to ignore me or block me or whatever one does on this site. Link to comment Share on other sites More sharing options...
Tash and Bex Posted September 19, 2019 Author Report Share Posted September 19, 2019 2 hours ago, ditchcrawler said: In a house situation if its at atmospheric pressure how does the hot water get out? I know, why not have a plastic tank full of cold water that you heat up when you want a bath and then pump it into the bath from the tank, you could have it open so it doesn't pressurise, Maybe you could heat it with a diesel fired heater, something like a Webasto well, that sounds like an excellent plan, and the hot water gets out doe to the head of water betwixt that and the header tank. the header tank usually being in the loft, in this case the "header" will be a simple expansion tank to allow for....expansion. I guess just a skin fitting through the deck head would be more than adequate 3 hours ago, Boater Sam said: Coaxial plumbing is difficult to arrange, requires special tee pieces. unless of course you drill a 10mm hole through a couple of push fit copper elbows and solder the 10mm pipe? Link to comment Share on other sites More sharing options...
ditchcrawler Posted September 19, 2019 Report Share Posted September 19, 2019 Just now, Tash and Bex said: well, that sounds like an excellent plan, and the hot water gets out doe to the head of water betwixt that and the header tank. the header tank usually being in the loft, in this case the "header" will be a simple expansion tank to allow for....expansion. I guess just a skin fitting through the deck head would be more than adequate Are so does that 30 foot head appear as pressure in the atmospheric tank? one with a pressure rating of 21 psi. Link to comment Share on other sites More sharing options...
Tash and Bex Posted September 19, 2019 Author Report Share Posted September 19, 2019 (edited) 7 minutes ago, ditchcrawler said: Are so does that 30 foot head appear as pressure in the atmospheric tank? one with a pressure rating of 21 psi. I have no idea, if you would like to work it out the calculation is P=Hx0.433 That will give you the pressure in PSI for any given height. incidentally "H" in this case is expressed in feet. Generally it is not an issue as the HWC is only around 6' lower than the header. gosh I had to pull that one from the back of my mind, i haven't done hydrostatic fluid pressure since school! Hope that helps Edited September 19, 2019 by Tash and Bex clarification Link to comment Share on other sites More sharing options...
Paul C Posted September 19, 2019 Report Share Posted September 19, 2019 Its the Poiseuille Equation, I think? That's assuming the flow remains laminar (I think it will......but you can always check by calculating the Reynolds number). Link to comment Share on other sites More sharing options...
Onewheeler Posted September 19, 2019 Report Share Posted September 19, 2019 If, is suggested elsewhere, you use the bath as your heat store, you could insulate the surface with tesselating plastic ducks. Is that sufficiently out of the box? 2 minutes ago, Paul C said: Its the Poiseuille Equation, I think? That's assuming the flow remains laminar (I think it will......but you can always check by calculating the Reynolds number). That tells you the delta P for laminar flow in a pipe. I've lost the plot as to what you're trying to calculate! Link to comment Share on other sites More sharing options...
blackrose Posted September 19, 2019 Report Share Posted September 19, 2019 Thinking outside the box, I just wouldn't bother with the bath. It's a silly idea on a boat in my opinion, but some people like them. Link to comment Share on other sites More sharing options...
stegra Posted September 19, 2019 Report Share Posted September 19, 2019 How about a whirlpool bath? You could re-plumb it so that the jets circulate through a Webasto. Fill it with cold water and wait for the water to heat up. You could fit a pipe thermostat to switch off the Webasto at the desired temperature. Link to comment Share on other sites More sharing options...
Boater Sam Posted September 19, 2019 Report Share Posted September 19, 2019 The Webasto is designed to operate on a closed circuit, feeding fresh water into it will not do the insides any good at all. Link to comment Share on other sites More sharing options...
ditchcrawler Posted September 19, 2019 Report Share Posted September 19, 2019 6 minutes ago, Boater Sam said: The Webasto is designed to operate on a closed circuit, feeding fresh water into it will not do the insides any good at all. Bath in deionised water Link to comment Share on other sites More sharing options...
Featured Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now