Air Source Heat Pumps

lovesgshp

just something from my boss who has the AirX 90.
Apologies, as it it a google translation from the Italian.

As for the direct experience relative all'IVT AirX 90 that heats my home, I have indicated, from 1 August 2015 to 20 January 2016 (six months) Electrical 1500kWh consumed, including circulation pumps. The data are in line with the consumption of the tab of the heat pump.
Referring to the daily consumption can say that in my case are consumed (2015-2016 winter values):
- 1.7-2.3 kWh / day for domestic hot water (often a bath and a couple of showers)
- 10 kWh / day for ACS and heating in autumn
- About 20-22kWh / day when temperatures are stiff and for some time it goes below zero. For example these days we touched -8 ° C outside

matelodave

beanyman1000 wrote: »

Hi matelodave

I was under the impression mono bloc meant just that, it was mono (stand alone.)
not a techie on this so I have no idea, I am trying to find out before I go ahead and purchase a system, and then find out I have to have more kit to make it work.
I have had IVT/Bosch around today trying to advise, But I live in France so conversation was not too helpful as my technical French is not very good. they say I need a hydrobox/controller with their system. problem is I have not designed the internals of the house to put one anywhere.

That's what I said, the compressor & hydrobox functions are all in the outside unit. You have to get the hot water from it into the heating system inside the house

beanyman1000

OK understood, So I can use just the outside heat pump connected directly to Manifold just the other side of the wall?

matelodave

Yes, although you need to make sure that your u'f system is capable of producing enough heat to heat the house when the heat pump is running at it's optimum temperature. Increasing the flow temperature has a disproportion increase in the cost of electricity so you need to get it right at the system design stage.

You do need to know how a heatpump differs from a conventional boiler and how to operate it efficiently otherwise you could be very disappointed

Likewise flow rates and system volumes have to be adequate to suit the heatpump requirements especially if you've got zone controls.

Shutting down the flow shuts down my heatpump with an alarm that needs to be reset unless there's a bypass system to ensure adequate flows until the pump shuts off.

beanyman1000

Oh dear sounds complicated, maybe I had better put the internal unit in as well.
because later I will be renovating the upstairs to put in Rads or fan units.

matelodave

It sounds as though you need to fully understand what your ultimate requirement will be as you'll have to get the system design and sizing right. Going at it piecemeal and trying to add on bits without having a proper design is a recipe for disappointment.

Some advice from experts is required

lovesgshp

Beanyman1000.
You have not really given a lot of information, just bits and pieces.
What is the size of the house and the area to be heated in the end?
If you are going to have a dual system, UFH and rads/fan coils, then you will need a buffer tank, so plan for that as well. To do the primary installation in the first place with everything set up, is far easier than adding bits later.
We are just finishing a GSHP install, that the client decided after the initial design, that they wanted 4 heating zones. Buffer tank of 300ltrs had to be added, plus many more costly thermostatic units, for remote control of the system.
Plan for what you want in the future, as it will be probably more cost effective in the short term.

beanyman1000

I have a 300 year old stone house, 120 sq metres down stairs and 100 sq metres upstairs(upstairs yet to be completed). the house was a total ruin. but in the process of restoring.
The house has all new wooden framed double glazing, windows and doors.
300 mm insulation to the roof 100 mm on 2 foot thick stone walls. and underfloor insulation.
I have installed underfloor pipework, and screed up to tile level.
there are 9 floor loops connected to Manifold.
Upstairs may have 3 beds and 2 baths with Rads or fans.
I have been told by 2 "sales People"( french of course), one says I need 6/7 kW pump the other says I need 9kW pump, one says I don't need hydrobox and the other one says I do. HELP.....

lovesgshp

Your first choice should be to get the thermal requirements for the whole house. Your architect should be able to complete this from the design plan, otherwise you need a thermal engineer. From that you will get a better idea of the pump size.
I would think 6/7kw for the size is a little too low, but the above report would be far more beneficial than a off the top of the head sizing. In Italy it is a requirement for us and we deal with many houses 300 years old, mostly with low insulation. Mine is 300 years old, stone walls and just roof insulation. Heating the top floor @ 120m2 is a 11 kw gshp. This also provides all the DHW.

beanyman1000

I have had the heat losses calculated by a UK pump company, who says 6kW would suffice, and French company say I need 9kW
what are the consequences of a too small or too big heat pump. apart from the cost to buy it?