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Author Topic: Pros & cons of using GAHP including install costs ?  (Read 1580 times)
Jr. Member
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« on: June 16, 2014, 08:52:55 PM »

Several companies are now producing a better combination of Gas burning / absorption with heat pump tech, ( I think ) will this be the way forward for many or not ?
 These GAHP units can be 150% more efficient in Gas consumption, that`s about a 50% improvement on the best condensing HE boilers, but (as yet ) they are not supported with RHI incentives.
 Is this another abnomally when the government have recognised that GAHP`s have an important role to play in decarbonising heating boilers.
Apparently the units use Gas for the heat transfer process providing a higher grade heat for Hot water and space heating, is that right ?   how ?
I am not sure of the full process, or why "heat pump" does anyone on here know how or why it`s more efficient ? 
Is this hybrid use a good way forward for domestic use or only commercial use ? Anyone know costs ?
I have a website link but not sure if I am allowed to mention it, please let me know.

Wet underfloor & multi zone Hybrid heating. Gas & 15Kw Heat Pump, Heat Stores 20 Evac Tube Solar Thermal. LED Lighting throughout.  Nissan Leaf Tecna Zero Emision Car.
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« Reply #1 on: June 16, 2014, 09:24:01 PM »

With gas at around 4p/kWh and electricity at around 14p/kWh, surely the average CoP figure has to be better than about 3:1 to make it viable, assuming you are paying for grid electricity ?


System:   7.5 kWp, 2 SamilPower 4500 Inverters, array bearing 145 / 43 deg slope.
               Two 200L DHW cylinders fed via Intelligent Immersion I3, using
               Willis (external) heaters, 2nd I3 diverter for space heating.
                Now looking to add wind turbines
Eccentric Anomaly
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« Reply #2 on: June 16, 2014, 09:49:21 PM »

I'm imagining something like a gas fridge but for heating a house. Is this something like that?

He who refuses to do arithmetic is doomed to talk nonsense - John McCarthy.
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« Reply #3 on: June 16, 2014, 09:53:24 PM »

Gas Absorption Heat Pumps - use gas rather than electricity as the prime mover. It's certainly a promising technology, but a long way to go. The principles have been around for years, but like Stirling engines, they have never been mass-produced on a reliable and affordable, practical scale, though hopefully it will improve with time. The COP would be around 1.5 - so nothing like the efficiency of electric heatpumps, but of course, the prime mover (gas) is a fair bit cheaper.
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