Total Heat and Energy @TotalHeatEnergy

@CustomRenewable @ViessmannCS_UK Yeah they say it's compressor only I think. The energy management thing in app seems pretty dynamic to compressor speed though so maybe it's more than an estimate 🤷🏻 dunno

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Total Heat and Energy @TotalHeatEnergy

2 years ago

Got to love heat pumps in new builds. @ViessmannCS_UK 151-A awesome dhw reheat efficiency! This has hydraulic separation, rads and ufh independent WC control with pumps and mixing valves. Can't wait to see it through the cold months expecting mid 4's over a year.

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@Damon_BPHR @BoilerfitNW @ViessmannCS_UK I've got another 150-A no separation all ufh 10ish m 28mm primaries with HG spec 300L cylinder with 3.5 cop on hot water. Sensor is right at bottom though and hys at 10k. Heating cop really good. Cooling cop 7.9🤯

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@Damon_BPHR @BoilerfitNW @ViessmannCS_UK 8kw and about 10m max of flow and return

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@Damon_BPHR @BoilerfitNW @ViessmannCS_UK It's an 8kw I think. Home owner chooses hot water temp. I just tell them to keep it as low as they're comfortable with.

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@russ_the_ref @ViessmannCS_UK @_heatgeek @_ChiefGeek @_heatgeek has developed a small hot water solution that needs a fraction of this space. Especially if coupled with a vaillant arotherm or similar that doesn't need a bulky indoor unit.

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@htfb @_ChiefGeek Exhaust air heat pumps ftw. Dragging out the moisture= dragging out tons of energy

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@_ChiefGeek Try measuring co2 levels in a traditional closed house in winter. 1000ppm not uncommon. I believe we should look more at using heat pumps to recover more from the waste/exhaust air

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@Damon_BPHR @BoilerfitNW @ViessmannCS_UK 52°c set temp and eco mode

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@Damon_BPHR @BoilerfitNW @ViessmannCS_UK Dhw*

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@Damon_BPHR @BoilerfitNW @ViessmannCS_UK 🤣 All day on to manage reheat. 10k hysteresis. High usage, am actually worried that 190L isn't enough for them. Also got secondary circ to waste a bit of energy for 10 mins a few times a day. Yeah the way it runs pumps is 🤯

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@Damon_BPHR @BoilerfitNW @ViessmannCS_UK It actually keeps heating pumps running while she reheating, strange

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@_heatgeek I know this solution as "semi instantaneous hot water" when either plate charging a relatively small dhw store or a buffer with plate dhw delivery.

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@JeremyClimas @_heatgeek When I was a lad a company called sanyo had a system like this for their co2 heat pump. Direct heating of a body of water gives a low return temp, great for co2 HP's and it's wide dt, but also good for letting the return temp dictate flow temp with low dt HP's.

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@JeremyClimas @_heatgeek I'm thinking a thermal store with either plate or coil dhw delivery

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Total Heat and Energy @TotalHeatEnergy

2 years ago

@Damon_BPHR Maybe overkill , just thinking with the possibility of heat gain it would keep the buffer temps stratified and useable then increase runtime and off time, with lower return temp. Hopefully it would follow the heat curve and not be ridiculous over temp for buffer.