Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
|
LinkBack | Thread Tools | Display Modes |
#41
Posted to uk.d-i-y
|
|||
|
|||
Santon v's Megaflo???
"Doctor Drivel" wrote in message ... Old wives tales. A heat bank (using a plate heat exchanger) can operate a store temperature only 5C above DHW tap temperature. If you set the taps to 50C, you can have 55C store temp. You need to a have an oversized plate heat exchanger, say 150kW, to extract as much heat as possible from the stored water. This does not add much to the cost. Using an internal DHW coil (thermal store) you need to have higher store temperatures. The larger plate heat exchanger makes all the difference and transforms thermal stores into a heat bank which is something special in DHW delivery. I assume the heat pump is air sourced? The Mitsubishi is about the best. Ground sourced heat pumps perform much better and generally will give a 60C plus store temps no problem. My heat pump is water sourced. And although you are right that my heat pump can deliver 60 degrees (in fact my NIBE Fighter 1330 can deliver water at up to 65 degrees) the efficiency drops markedly the higher you go. The NIBE figures that I have to hand a output 35 deg efficiency 481% output 50 deg efficiency 342% output 65 deg - does not say, but no doubt falling fast! We are also in the country and at the moment when the power fails - a few times a year - then we have no hot water because there is no power for our current plate heat exchanger. No combination is perfect in every scenario, but I have made my choice now. Regards Bruce |
#42
Posted to uk.d-i-y
|
|||
|
|||
Santon v's Megaflo???
Doctor Drivel wrote:
"Tim Downie" wrote in message ... Is there anything that you actually *know* about as opposed to be "full of p*ss & wind" about? **** off idiotic arsehole. From anyone else I'd take that as an insult. From you, it means my job is done. Regards Tim |
#43
Posted to uk.d-i-y
|
|||
|
|||
Santon v's Megaflo???
"Bruce" wrote in message ... "Doctor Drivel" wrote: "Tim Downie" wrote in message ... Is there anything that you actually *know* about as opposed to be "full of p*ss & wind" about? **** off idiotic arsehole. Makes a change from "eff off you idiotic plantpot", I suppose. A bit of variation helps then day go along. |
#44
Posted to uk.d-i-y
|
|||
|
|||
Santon v's Megaflo???
"BruceB" wrote in message ... "Doctor Drivel" wrote in message ... Old wives tales. A heat bank (using a plate heat exchanger) can operate a store temperature only 5C above DHW tap temperature. If you set the taps to 50C, you can have 55C store temp. You need to a have an oversized plate heat exchanger, say 150kW, to extract as much heat as possible from the stored water. This does not add much to the cost. Using an internal DHW coil (thermal store) you need to have higher store temperatures. The larger plate heat exchanger makes all the difference and transforms thermal stores into a heat bank which is something special in DHW delivery. I assume the heat pump is air sourced? The Mitsubishi is about the best. Ground sourced heat pumps perform much better and generally will give a 60C plus store temps no problem. My heat pump is water sourced. And although you are right that my heat pump can deliver 60 degrees (in fact my NIBE Fighter 1330 can deliver water at up to 65 degrees) the efficiency drops markedly the higher you go. The NIBE figures that I have to hand a output 35 deg efficiency 481% output 50 deg efficiency 342% output 65 deg - does not say, but no doubt falling fast! We are also in the country and at the moment when the power fails - a few times a year - then we have no hot water because there is no power for our current plate heat exchanger. No combination is perfect in every scenario, but I have made my choice now. Regards Bruce Best you re-assess. A heat bank can operate on two temperatures. The top for DHW can be 55-60C, the bottom can be dictated by a weather compensator - variable temperature. A flow to the top of the cylinder (DHW) and one to the bottom section (CH). Priority DHW. When the top calls for DHW the heat pump comes in and heat the top section. When satisfied, it diverts to the bottom weather compensated controlled variable temperature section, which most of the time will be on a lower temperature than the top. More like 40 to 50C. So, the heat pump on average will be running efficiently. Then if you are on cheap overnight electricity, you can store as much heat as possible by having larger thermal storage - bigger cylinder. Don't make decision flippantly. Look into it properly. Heat pumps and heat banks go together very well. |
#45
Posted to uk.d-i-y
|
|||
|
|||
Santon v's Megaflo???
"Tim Downie" wrote in message ... Doctor Drivel wrote: "Tim Downie" wrote in message ... Is there anything that you actually *know* about as opposed to be "full of p*ss & wind" about? **** off idiotic arsehole. From anyone else I'd take that as an insult. You haven't heard me do insults yet. |
#46
Posted to uk.d-i-y
|
|||
|
|||
Santon v's Megaflo???
"Doctor Drivel" wrote:
"Tim Downie" wrote in message ... Doctor Drivel wrote: "Tim Downie" wrote in message ... Is there anything that you actually *know* about as opposed to be "full of p*ss & wind" about? **** off idiotic arsehole. From anyone else I'd take that as an insult. You haven't heard me do insults yet. Go on then, call him an "effing plantpot"! ;-) |
Reply |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Oso Vs Megaflo... | UK diy | |||
F&E tank for a megaflo? | UK diy | |||
megaflo pressure | UK diy | |||
Santon High Pressure Hot Water Hammer | UK diy | |||
Megaflo CL170 usage | UK diy |