[Nick Grant]

And Tahir has just volunteered to market the conference next year!
🙂

[Nick Grant]

The only case I can think of for it being open to non members is to encourage enthusiasts within larger organisations who might have difficulty getting approval for their company to join.

For individuals it costs very little to join so it is not a significant barrier at time of booking. ie the conference is open to anyone who wants to pay the fee and their sub.

[Nick Grant]

I would have thought that if we got expenses to attend AGM/board meeting then it would be only fair that we pay to attend the conference. Unless running a workshop or helping run it.

I'm very pleased not to have had to pay to attend.

Nick

[Nick Grant]

I think this flags up a general issue with black box software where the workings cannot be seen.

When a result goes so against the accepted physics it seems prudent to test the software as Exeter seem to have done with their simple experiment varying the area to perimeter ratio. If a contrary result is to be presented as a major finding rather than an anomaly in need of explanation, then I'd say even more due diligence is required.

As Carl Sagan said, 'extraordinary claims require extraordinary evidence'.

[Nick Grant]

Yes Thanks for flagging this up Mike.

I would however suggest that the papers do rather more than 'raise questions about whether Tas and IES can accurately model heat loss from solid floors' since they actually offer a proof that they don't.

As you know a number of us have been concerned that the Glamorgan claims have been picked up by Architects as fact but have not had the resources to do the work that Exeter have done.

I do hope that a clarification if not an apology can be published at least as widely as the original article. It is hard enough getting Architects and clients excited about insulation without articles claiming that it makes no difference (in floors).

Nick

[Nick Grant]

Not sure what you are suggesting Andy given that all seems to be designed and ready for them to contact PHI directly. If any of us get involved as individuals there will be an extra layer of cost.

None of us are qualified, experienced and and PHI approved to actually do the checking instead of PHI and I expect that will be some way off.

Nick

[Nick Grant]

Sun at 1pm BST

[Nick Grant]

Colin

Sorry but I can only answer your first question.

PHPP assumes 25 litres @ 60C per person and occupancy is based on 1 person per 35m2 so you can then work out DHW/m2. As I said it is 15 before you add in the losses and any extra for white goods if hot fill.

Nick

[Nick Grant]

My guess is that you won't make 15 kWh/m2 unless Alan can do some jiggery pokery, will be interesting to see. Might be able to argue a temperature reduction factor for wall that is nearly attached to neighbour.

Good luck

[Nick Grant]

Hi Ben

Glad to see this is taking off.

Have you got calcs and approvals for up to 300mm cavities in terms of structure or does each case need to be calculated by an engineer?

Cheers

Nick

[Nick Grant]

Mark

My understanding was that it is probably only possible for flats and terrace housing rather than detached. As non South windows seem to give a net heat loss they might need to be smaller than we might like otherwise will need to be particularly low heat loss.

I don't think any of us have tried modelling anything NS yet and Jürgen only had one example.

Nick

[Nick Grant]

Tom try

https://aecb.net/forum/index.php?topic=13.0

and Google Larsen Truss.

Whether the webs carry shear load or the outer skin is supported depends on design.

Nick

[Nick Grant]

Colin

You probably twigged that PHPP 25 litres @ 60C doesn't include washing machine or dish washer (if hot fill is used this is added to DHW load).

From sums such as yours I concluded that 25 litres is possible with some care but not over generous. Interestingly this equates to 15 kWh/m2, same as space heat, before losses.

Big issue in reality with SAP and PHPP is that water use is well correlated to occupancy but not floor area.

Obviously this is about energy prediction rather than sizing of DHW systems which have to cope with peaks such as guests etc.

Nick

[Nick Grant]

Thanks Pete

[Nick Grant]

Bill Butcher said I can post one of his photos showing a nice big radiator in a Passivhaus.

I did look briefly at combi boilers and low flows with water efficient fittings but only issues of function rather than efficiency:

http://www.elementalsolutions.co.uk/downloads/combis%20and%20low%20flows.pdf

Nick

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