tag:blogger.com,1999:blog-14798090.post1472751585940866395..comments2024-03-27T06:42:31.956+00:00Comments on Mark Brinkley (aka House 2.0): Unintended consequences No 12: PV for water heatingMark Brinkleyhttp://www.blogger.com/profile/03473684038478246288noreply@blogger.comBlogger10125tag:blogger.com,1999:blog-14798090.post-66032760685302037302014-03-11T12:41:29.230+00:002014-03-11T12:41:29.230+00:00The advantages of Solar PVs certainly override tha...The advantages of Solar PVs certainly override that of solar thermal panels. Firstly the output yielded by them is convertible and can be exported to the grid for reuse. Secondly it is cheaper in terms of cost and simple to install and maintain. Thirdly it occupies less space as compared to a thermal system. You can get experience further advantages by having a surplus power manager installed SEPhttp://www.solarimmersion.co.uknoreply@blogger.comtag:blogger.com,1999:blog-14798090.post-27038090555942114882012-11-26T12:14:28.570+00:002012-11-26T12:14:28.570+00:00A small hot water tank with a DC heater run of a P...A small hot water tank with a DC heater run of a PV, preheating water that is heated by a coombe boiler can be very cost effect as it is cheap to install. If the preheating tank is needed to get enough flow rates for more than one bathroom, the add-on cost of the DC heater and PV panel cannot be beaten.<br /><br />SuperFlow Solar-PV is an example of such a system.<br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-14798090.post-43770820274013884772012-01-30T11:52:45.237+00:002012-01-30T11:52:45.237+00:00Interesting; So how would I go about feeding all m...Interesting; So how would I go about feeding all my excess generation into my hot water tank. (I'm about the replace the immersion heater) <br /><br />I guess a cheap & chearful method might be to add 2nd, an extra low power heater element on a timer.Geoff_Shttps://www.blogger.com/profile/18412009857566923357noreply@blogger.comtag:blogger.com,1999:blog-14798090.post-71373319297561222082011-09-02T17:40:10.103+01:002011-09-02T17:40:10.103+01:00In carbon terms feeding PV generation into the gri...In carbon terms feeding PV generation into the grid is good, it will displace fossil power sources. So if you are grid connected then using your PV on site is the same in carbon terms as using electricity from the mains.<br />So the question is, how does solar thermal compare with on-peak electricity? Not very well usually, but in some cases (like offices) an instantaneous electric water heater Alan Clarkenoreply@blogger.comtag:blogger.com,1999:blog-14798090.post-15996990859745590612011-08-29T12:48:03.657+01:002011-08-29T12:48:03.657+01:00Water heater Uk small house i like themWater heater Uk small house i like themmauricecflynnhttp://www.finzelsreachblog.com/noreply@blogger.comtag:blogger.com,1999:blog-14798090.post-77541597408645441012011-08-18T16:01:08.429+01:002011-08-18T16:01:08.429+01:00It's nothing to do with the FITS scheme, but s...It's nothing to do with the FITS scheme, but simply, as you say, what to do with the surplus of electricity produced e.g. on sunny summer days, regardless of FITS or not. What do you suggest? more public spirited to feed it back to the grid perhaps but a) the grid then has to store it and b) the grid pays peanuts for the feed back. Localisation says it's better to find a way to usefully Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-14798090.post-52472177173825805092011-08-09T17:12:57.248+01:002011-08-09T17:12:57.248+01:00Mark,
Before we get carried away with PV and its o...Mark,<br />Before we get carried away with PV and its onslaught on solar thermal we need to see daytime generation in the context of lifestyle.<br />Two folk,showered,hair dried,light breakfast, tea (with chilled milk from the fridge) and toast, ironed shirt, quick doze of breakfast news,PC on standby then off to work.Consumption in daylight hours 5.9kwh.<br />Same couple in all day with tell&mike menzieshttps://www.blogger.com/profile/04291424354441247833noreply@blogger.comtag:blogger.com,1999:blog-14798090.post-54364980128994156852011-08-09T13:51:44.435+01:002011-08-09T13:51:44.435+01:00Next thing you know someone will propose a zero ca...Next thing you know someone will propose a zero carbon school with electric water and space heating offset by PV . . .Nick Granthttps://www.blogger.com/profile/11949493936074643201noreply@blogger.comtag:blogger.com,1999:blog-14798090.post-15288140197846107982011-08-08T15:20:15.646+01:002011-08-08T15:20:15.646+01:00I've made similar calculations for an off-grid...I've made similar calculations for an off-grid system, not wanting to have anything to do with the FITs, RHI or anything. My numbers came out with PV being three times more expensive than solar thermal. If you use a heat pump with a COP anywhere approaching 3 the flexibility of PV begins to make a lot of sense.<br /><br />The points Rainbow Bob makes about stagnation and freezing are minor Ed Davieshttp://edavies.me.uk/noreply@blogger.comtag:blogger.com,1999:blog-14798090.post-49438841788115128702011-08-08T12:43:15.088+01:002011-08-08T12:43:15.088+01:00Heating water using PV makes a sort of sense consi...Heating water using PV makes a sort of sense considering the UK's small houses. There isn't a lot of roof space, there isn't a lot of space for a more complicated hot watertank with two coils in it. <br />Solar hot water needs extra plumbing and isn't quite fit and forget - you need to worry about whether there is too much heat in the summer and whether the system is going to Bob Irvinghttps://www.blogger.com/profile/06637476707951876595noreply@blogger.com