The planners had to face two considerable challenges: the plan of the technology units operating in the Resort and the design of the various buildings. Their commitment to reduce the environmental impacts as much as possible has resulted in a real power plant built at the back of the Resort.
It hosts all the most advanced systems for the production of electrical energy, heating and cooling and is made of three main plants:
- Biomass Plant
- Micro-turbines cogeneration plant
- Absorption cooling system
A biomass plant fed by wood chips has been installed to produce thermal energy. It significantly reduces the carbon dioxide emissions and allows to optimize the use of the wood of this area minimizing the
environmental impact. As for the stock up on biomass, the usage of woods and remains of gardening implies a strong involvement of the local agriculture.
With a production of thermal 720 Kwh, the biomass plant covers about 70% of the thermal energy demand of the Resort, namely heating rooms, swimming pools and producing sanitary warm water.
The biomass plant allows an annual oil saving of about 220,000 liters that means an annual CO2 emission reduction worth about 510 tons.
Micro-turbines cogeneration plant
Next to the biomass plant, we have built a cogeneration plant for the combined production of electrical and thermal energy. The plant is made of two identical micro-turbines fed by methane gas; there is an electric generator, a heat-exchanger and a control and supervision system.
The heat produced by the micro-turbines is used to power the heating system in the winter as well as the absorption cooling system in summer. The whole plant can yearly produce about 1,100 Mwh of electrical energy and about 1,900 Mwh of thermal energy, thus reducing the CO2 emission of about 380 tons/year. Moreover, the micro-turbines are optimized in order to operate in compliance with the minimum limits for exhaust emissions.
Absorption cooling system
The cooling production is covered for about 75% by an absorption cooling system, which can be considered the real plus of Lefay Resort & SPA Lago di Garda; as a matter of fact, this technology plant is one of the few in Italy and it enables to generate cooling by using the heat exhausted through the micro-turbines and the biomass boiler.
The remaining 25% cooling is produced by a high-performance compression cooling system.
Methane powered boiler
In order to cover the remaining 10% of the annual energy consumption, a methane powered boiler has been installed. This serves also as a security system in case of breakdowns or extraordinary repairs carried out to other systems.
Our Guests are going to be deeply impressed by the photovoltaic plant placed above the dining room – to the extent that they can see it. The cupola is in fact completely made of photovoltaic panels; in addition to their decorative function, it also serves as shading system, thus avoiding overheating in summer and providing an atmosphere similar to an airy and bright pergola.
The plant can produce about 12,200 kwh/year of electric energy and together with the micro-turbines, it ensures about 60% of the demand for electric energy, while the remaining 40% is supplied by the electric energy network.
Further saving potentials are provided by various operational software implemented in the Resort; in particular, the daytime light control is managed by a dedicated software which receives information about natural light from a heliometer installed on the roof. The system allows reducing the artificial lighting levels when sufficient natural light is available, as well as during the night or in case of scarce use.
Moreover, the lighting of common areas and walkways is operated by a presence or movement detector, while outdoor areas feature lighting parts directing the shaft of light only where it is needed, without dispersions. Light and shadow upon request provide a particular ambience and allow energy saving.
In addition to this, there is also a facility for the optimization of electrical loads and control of withdrawal peaks. The power absorbed by all the electrical users is continuously monitored by the software which compares it with predefined maximum values; in case of overload and consequent exceeding of the values set, the system controls the partial or entire disconnection of users and groups of selected users according to a specified priority scheme.
Energy saving and reduction of CO2 emissions (carbon dioxide emissions)
At present, the share of renewable energy sources at Lefay Resort & SPA Lago di Garda amounts to about:
- 85% for thermal energy production used for heating, hot water production and swimming pools
- 100% for room cooling and air cleaning,75% own production
- 100% for electric energy production, 60% own production, the rest is purchased and certified RECS, which guarantee that the energy comes from renewable sources
- 60% for electric energy production
In addition, the use of renewable sources of energy and innovative and advanced technologies enables to dramatically reduce CO2 emissions (carbon dioxide emissions) and to achieve a global reduction in emissions of 1,130 tons per year.