remove lagging from cold water tank in summer ?
Hi, I have 2 large plastic water tanks in my loft (= a small header for the CH). The tanks are black plastic and interconnected. They are also well lagged. I was thinking about solar Hot water and it occurred to me that during the summer it may be of benefit to remove the insulation from the tanks. The attic can get unbearably hot and presumably the insulation is working against any preheating of the water before it hits the boiler for HW ? I'd guess by pure infra red radiation the plastci tank would heat fractionally on hot days ? Of course with the mad UK weather there is always the risk of a cold spell, but I'd guess for a few months the risk would be low. anyone do this and get any benefit |
remove lagging from cold water tank in summer ?
On 29 Mar, 21:04, wrote:
On 29 Mar, "jives11" wrote: Hi, I have 2 large plastic water tanks in my loft (= a small header for the CH). The tanks are black plastic and interconnected. They are also well lagged. I was thinking about solar Hot water and it occurred to me that during the summer it may be of benefit to remove the insulation from the tanks. The attic can get unbearably hot and presumably the insulation is working against any preheating of the water before it hits the boiler for HW ? I'd guess by pure infra red radiation the plastci tank would heat fractionally on hot days ? Of course with the mad UK weather there is always the risk of a cold spell, but I'd guess for a few months the risk would be low. anyone do this and get any benefit Don't! It will stagnate at an elevated temperature, and be liable to spread legionella, particulary if there is a cold draw off from it. It must be kept at below 20degC. -- B Thumbs Change lycos to yahoo to reply Many thanks. I had not thought of that. So how do solar water heating systems avoid this ? I'd assumed they preheat stored water before it enters the boiler. Last year while on holiday in Crete I noticed lots of houses *appeared* to have black plastic water tanks on their flat roofs. I'd assumed this was a cheap way to get some raise of temperature. |
remove lagging from cold water tank in summer ?
On 29 Mar 2007 13:19:38 -0700, "jives11"
wrote: On 29 Mar, 21:04, wrote: On 29 Mar, "jives11" wrote: Hi, I have 2 large plastic water tanks in my loft (= a small header for the CH). The tanks are black plastic and interconnected. They are also well lagged. I was thinking about solar Hot water and it occurred to me that during the summer it may be of benefit to remove the insulation from the tanks. The attic can get unbearably hot and presumably the insulation is working against any preheating of the water before it hits the boiler for HW ? I'd guess by pure infra red radiation the plastci tank would heat fractionally on hot days ? Of course with the mad UK weather there is always the risk of a cold spell, but I'd guess for a few months the risk would be low. anyone do this and get any benefit Don't! It will stagnate at an elevated temperature, and be liable to spread legionella, particulary if there is a cold draw off from it. It must be kept at below 20degC. -- B Thumbs Change lycos to yahoo to reply Many thanks. I had not thought of that. So how do solar water heating systems avoid this ? I'd assumed they preheat stored water before it enters the boiler. Last year while on holiday in Crete I noticed lots of houses *appeared* to have black plastic water tanks on their flat roofs. I'd assumed this was a cheap way to get some raise of temperature. I dont think you can have a solar heater with a combi if thats what you mean, you need a stored hot water cylinder system which heats the water to over 60 degrees C. |
remove lagging from cold water tank in summer ?
On 29 Mar 2007 13:19:38 -0700 someone who may be "jives11"
wrote this:- Many thanks. I had not thought of that. So how do solar water heating systems avoid this ? I'd assumed they preheat stored water before it enters the boiler. Assuming you are thinking of the domestic hot water heating part of a combination boiler, the solar panel will feed a relatively small hot water cylinder from which water to the boiler is drawn (either directly or via a heat exchanger). The combination boiler must be able to accept heated water. -- David Hansen, Edinburgh I will *always* explain revoked encryption keys, unless RIP prevents me http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54 |
remove lagging from cold water tank in summer ?
On 30 Mar, 06:39, David Hansen
wrote: On 29 Mar 2007 13:19:38 -0700 someone who may be "jives11" wrote this:- Many thanks. I had not thought of that. So how do solar water heating systems avoid this ? I'd assumed they preheat stored water before it enters the boiler. Assuming you are thinking of the domestic hot water heating part of a combination boiler, the solar panel will feed a relatively small hot water cylinder from which water to the boiler is drawn (either directly or via a heat exchanger). The combination boiler must be able to accept heated water. -- David Hansen, Edinburgh I will *always* explain revoked encryption keys, unless RIP prevents me http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54 Thanks. I wasn't thinking of a combi. My system is a fully pumped system with ho****er tank. I had assumed that anything that raised the temperature of the water in the HW header tank would reduce the amount of gas and hence CO2 consumed. So how do solar hot waters heat the water ? Is there a secondary coil in the hot water tank, through which the solar heated water is pumped OR do they raise the temperature of the water in the storage tank. Sounds like the latter is unlikely given the health issues with having quantities of warm water hanging around with only a lid protecting it. |
remove lagging from cold water tank in summer ?
On 30 Mar 2007 02:16:52 -0700 Jives11 wrote :
So how do solar hot waters heat the water ? Is there a secondary coil in the hot water tank, through which the solar heated water is pumped This is the preferred method, though you can put s pre-heat cylinder in the existing cylinder feed OR do they raise the temperature of the water in the storage tank. No, partly for the reason you give (legionnaires), also because there is potential for this water to become dangerously hot and it is being fed to uncontrolled places (e.g. basin 'cold' taps), also a plastic cistern full of very hot water is not a good idea. -- Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk |
remove lagging from cold water tank in summer ?
On 30 Mar 2007 02:16:52 -0700 someone who may be "jives11"
wrote this:- Thanks. I wasn't thinking of a combi. My system is a fully pumped system with ho****er tank. http://www.navitron.org.uk/solar_collector_panel.htm has a diagram of one way a solar panel can be connected. -- David Hansen, Edinburgh I will *always* explain revoked encryption keys, unless RIP prevents me http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54 |
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