Robur GAHP are environmental friendly
using natural gas + renewable energy sources(1)
Each Robur gas absorption heat pump:
• adds 1 kW of natural gas to 0.5 kW of renewable energy(2).
This renewable energy is 24-hours-a-day-available, thus avoiding unnecessary integration systems and/or unnecessary heat rejection (e.g. solar panels in summer).
• saves every year 4.2 Tons of CO2 emissions(3), which are equivalent to those absorbed by 599 trees(4) or those produced by 2 green cars(5); every year 1.6 TOE are saved.
• is the best solution to the problem of global warming due to greenhouse gases, using a natural refrigerant with GWP (Global Warming Potential)=0.
Back to Reasons for a choice
(1) All data are tested and certified by ENEA for Italy, DVGW Forsschungsstelle and VDE for Germany, California Energy Commission for USA. Assuming that the specific heating capacity is 38.3 kW with only 25.2 kW of gas input thanks to the use of renewable energy.
(2) With solar termal, to produce 0.5 kW, approx. 1m2 of collectors is necessary.
(3) Each GAHP can save 2.165 m3 of natural gas every year (1 m3 of natural gas produces 1.94 Kg of CO2) assuming 1.000 hours of operation per year.
(4) 1.000 square meters of forest in the Ticino Natural Park absorb 500 Kg of CO2 per year, assuming that one tree occupies 14 square meters. Source: LifeGate.
(5) Assuming that a car covers 15.000 Km per year and produces 140 g CO2 per Km. Source: ACEA European Automobile Manufacturers Association.
Efficiency and use of renewable energy in heat pumps
A heat pump is an appliance capable of exploiting the large amount of energy available in natural sources at a lower temperature and of tranferring it in the form of useful heat to a user at a higher temperature. Electric heat pumps work with a compressor powered by electricity. Absorption heat pumps are powered directly by natural gas or LPG with a very minor electrical consumption.
The advantage is high heating efficiency, due to the fact that main energy input (natural gas) is primary energy and not electricity, which is generated with low efficiencies (40% on average).
In Fig. A, energy balances are shown between electric heat pumps and Robur absorption heat pumps. The energy balance based on primary energy highlights the higher efficiency of Robur gas absorption heat pumps in comparison to the electricalones (COP of 3.8). In spite of seemingly higher use of renewable energy by electric heat pumps, electric power generation requires higher use of primary energy upstream. A Robur gas absorption heat pump, instead, uses primary energy directly (natural gas or LPG).
In fig. B energy balances of Robur gas absorption heat pumps are shown for 3 different types of renewable energy sources: air, water and ground.