F gas A2A and A2W

[Oz07]

23 minutes ago, JohnMo said:

Be careful if you bother doing a cooling heat gain calculation, as instantaneous solar gains can give you a huge heat gains. Others on here have tried it got 20kW cooling requirements and 2kW heating requirements. Then got bogged down with indecision. Size your heat source for heating needs, accept cooling isn't perfect, but better than nothing. Or go full A2A. Be pragmatic or pay £20k for a good plated solution.

 

Think @Nickfromwales did a cooling solution where he cooled the upstairs/downstairs hallway instead of the bedrooms directly. That sort of solution cuts the number of fan coils needed, moves noise away from bedrooms and any drafts away caused by fan coils.

Are the fan coils excessively noisy then?

[JohnMo]

8 minutes ago, Oz07 said:

Are the fan coils excessively noisy then?

No not noisy, but there is some fan noise depending on fan speed.

[Oz07]

3 minutes ago, JohnMo said:

No not noisy, but there is some fan noise depending on fan speed.

Just similar to an aircon unit then?

[JohnMo]

4 minutes ago, Oz07 said:

Just similar to an aircon unit then?

Basically, same design really one uses water the other refrigerant

[Oz07]

Why are some wall mounted, like aircon and some floor mounted like radiators? I need to visit a house with these working.

[JohnMo]

1 hour ago, Oz07 said:

Why are some wall mounted, like aircon and some floor mounted like radiators

Personal choice 

[Nickfromwales]

3 hours ago, JohnMo said:

Be careful if you bother doing a cooling heat gain calculation, as instantaneous solar gains can give you a huge heat gains. Others on here have tried it got 20kW cooling requirements and 2kW heating requirements. Then got bogged down with indecision. Size your heat source for heating needs, accept cooling isn't perfect, but better than nothing. Or go full A2A. Be pragmatic or pay £20k for a good plated solution.

 

Think @Nickfromwales did a cooling solution where he cooled the upstairs/downstairs hallway instead of the bedrooms directly. That sort of solution cuts the number of fan coils needed, moves noise away from bedrooms and any drafts away caused by fan coils.

That was the original plan, when considering a combined hydronic solution with heat / cool via slab / MVHR / one big built in fan coil unit to scavenge the excess heat from the first floor.

 

Binned that now in favour of full AC, all built in to purpose made ‘hideouts’ with 4 units for 4 bedrooms, and a large 5th unit for the large gallery aspect / FF landing.

 

Each bedroom will have it’s own stat so each can respond linear to sunshine / solar effects, but also so the second they're not needed anymore they go into standby.

 

As always, early prevention means you don’t need an aggressive cure. 

[Oz07]

1 hour ago, Nickfromwales said:

That was the original plan, when considering a combined hydronic solution with heat / cool via slab / MVHR / one big built in fan coil unit to scavenge the excess heat from the first floor.

 

Binned that now in favour of full AC, all built in to purpose made ‘hideouts’ with 4 units for 4 bedrooms, and a large 5th unit for the large gallery aspect / FF landing.

 

Each bedroom will have it’s own stat so each can respond linear to sunshine / solar effects, but also so the second they're not needed anymore they go into standby.

 

As always, early prevention means you don’t need an aggressive cure. 

What could be less aggressive than an aircon unit for each room? Or you mean atleast you've planned for it so no reason routing services? Have you taken a condensate to each ac location?

[Nickfromwales]

3 hours ago, Oz07 said:

What could be less aggressive than an aircon unit for each room? Or you mean atleast you've planned for it so no reason routing services? Have you taken a condensate to each ac location?

Units designed and sized to be near silent in operation, without the wart on the wall or ceiling.

 

Most of my projects (for clients) are planned out meticulously, using the slack in the sails during the 12 months before putting the foundations down, and this pays huge dividends.

 

Ducts and service risers, MEP pathways, removal of boxing in and avoidance of conflict or ‘shit hitting the fan during the construction phase’ are all sorted well in advance. Makes life so much easier, and also allows cost savings and value-engineering a plenty; for example, MBC didn’t charge for the service penetrations to be made in both of the 2 steels in the GF ceiling / amongst the posi-joists, where 8x mvhr ducts, 1x soil pipe, and x qty of small bore plumbing and electrics will pass through with blissful simplicity.

 

Condensate pipework to all locations, yes, on this atm. I discussed this with the client and explained why the pipework is not perfectly vertical; I explained that these condensate drains are constantly drip-drip-dripping and the sound of a water droplet landing on the rest bends in the GF ceilings would be like Chinese torture. My method for these is to put the rising 2.5m pipes in at an angle so the water runs down the pipe so it’s 100% silent.

 

Every detail needs to be in check, ahead of construction, and LONG before they become missed opportunities / compromises / annoyances / outright feckups.