Beelbeebub Posted October 8 Share Posted October 8 Screenshot from a video The A7W35 performance of 5.6kw with a CoP of 4.29 doesn't seem very impressive. For example the Grant r290 unit is rated at 4.99 at 4KW for the smallest and 4.95 at 7.6kw. If the Octopus unit was very small and compact it migbt be forgivable but it seems pretty, err, "portly" to be honest. Maybe it is very quiet. It is notable the Octopus unit uses 600g of refrigerant which is the same as thr grant 4kw unit. So maybe the Octopus unit is working harder so sacrificing CoP if it was derated to 4kw maybe it would perform like the Grant unit. I wonder what the noise levels are like. Link to comment Share on other sites More sharing options...
PhilT Posted October 9 Share Posted October 9 The MCS tests also record a poor performance for this unit compared to most other models Link to comment Share on other sites More sharing options...
Beelbeebub Posted October 9 Author Share Posted October 9 The refrigerant to air heat exchanger seems smaller than comparable units, partly because of the design of the case. Most "box" units have an L shaped coil to get extra area. Then all the gubbins off to one side. The Octopus one is just a square heat exchanger with the gubbins infront/below. I'm thinking there is probably a really good reason that almost every aircon/heatpump outside unit uses this offset box configuration. Link to comment Share on other sites More sharing options...
JohnMo Posted October 9 Share Posted October 9 1 hour ago, Beelbeebub said: thinking there is probably a really good reason that almost every aircon/heatpump outside unit uses this offset box configuration. Good air flow would be the prime reason I suspect. Makes you think, a small box with the compressor, heat exchanger, pumps etc. to sit outside and a big external to the box condenser, if big enough no fan needed. Link to comment Share on other sites More sharing options...
Beelbeebub Posted October 9 Author Share Posted October 9 50 minutes ago, JohnMo said: Good air flow would be the prime reason I suspect. Makes you think, a small box with the compressor, heat exchanger, pumps etc. to sit outside and a big external to the box condenser, if big enough no fan needed. Did wonder how big a surface area you would need for passive airflow to be enough. I think, given your radiators have a dT of around 20C to the room, and you probably don't want a dT of 20C between the evaporator and outside temp, you would need about 4x the area of your internal radiators on the outside of your building. That wouod imply a dT of 5ac between your evaporator and the outside air. Link to comment Share on other sites More sharing options...
MJNewton Posted October 9 Share Posted October 9 17 hours ago, Beelbeebub said: Screenshot from a video Was this the video? The installation has put me right off. Going from a boiler hidden neatly inside a kitchen cupboard to a grey washing machine sitting on your drive with all that pipework and black trunking going to it really doesn't feel like progress to me. 1 Link to comment Share on other sites More sharing options...
Beelbeebub Posted October 10 Author Share Posted October 10 (edited) 13 hours ago, MJNewton said: Was this the video? The installation has put me right off. Going from a boiler hidden neatly inside a kitchen cupboard to a grey washing machine sitting on your drive with all that pipework and black trunking going to it really doesn't feel like progress to me. No, it was some video about the factory in NI. Usual stuff about bringing employment and being in control of the process. But one shot had a guy putting the sticker on. https://youtu.be/u-kAyg6LOaw You're right about that video, awful placement - I'm a fan of Heatpumps (ha) but I'm not going to argue they are beautiful things. The best we can hope for is unobtrusive - and that isn't. Edited October 10 by Beelbeebub 1 Link to comment Share on other sites More sharing options...
sharpener Posted October 10 Share Posted October 10 (edited) 20 hours ago, MJNewton said: The installation has put me right off. Going from a boiler hidden neatly inside a kitchen cupboard to a grey washing machine sitting on your drive with all that pipework and black trunking going to it really doesn't feel like progress to me. Hideous. But some good technical ideas e.g. internal expansion vessel (which in my (Vaillant) install is bright red and a rather conspicuous feature in the utility room). No obvious provision for condensate drainage. I wonder what the neighbours think? I presume it is within the "curtliage of the dwelling" but AIUI to be sited there it would need PP (even if under 0.6 cu m) bc it is within 1 m of the boundary. Also it looks a reasonable neighbourhood but there are many parts of the country where all that copper would not last 5 mins on the outside of the boundary wall even when concealed neatly in trunking! Edited October 10 by sharpener Link to comment Share on other sites More sharing options...
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