ALTENER PROJECT NUMBER EIE/04/252/S07.38608
Renewable Energy Sources and Micro CHP in Rural Lodges
GREEN LODGES
ENERGY AUDITS SUMMARY
FRANCE
ENERGY AUDIT
SUMMARY
«”REFUGE DE L’AIGUILLE”»
LODGE’S GENERAL DATA
1. GENERAL DATAS
Name : Refuge de l’Aiguille
Adress: Mairie de Morzine - FRANCE
Telephone: +33 (0)4 50 79 04 33
Contact person : Monsieur le Maire
Type of lodge : refurbishment, isolated mountain refuge
Use range :
Open periods : Summer & Winter
Capacity : 40 beds et 60 meals per service
Occupancy rate (%): The refuge being in construction, the occupancy
rate was not estimated
LODGE’S DESCRIPTION
•
The commune of Morzine renovates the country cottages of the Aiguille to carry out a refuge. The
buildings are old (1 900) and must be entirely renovated. With term, the refuge will count forty beds.
•
A restoration integrating Environmental High Quality (HQE®) criteria is previewed. Work must be
completed in 2006.
•
The refuge is located at 2’000 meters in altitude and not grid-connected to the electrical network.
ENERGY DEMAND
As the refuge will be not grid-connected to the electrical network, the needs for electricity will be limited to
the maximum (5 to 10 kWh / open day). Heating and production of hot water will be produced by a
propane boiler. According to the opening periods, consumption will be able to strongly vary. These ones
are estimated about 20’000-30’000 kWh/an.
IMPROVEMENT ACTIONS
•
Rational use of energy (RUE): Refurbishment will integrate High Environmental Quality criteria
(HQE®).
•
Energy efficiency: The site being in isolated place from the electrical network, all the equipments
will be powerful in terms of energy efficiency; in particular lighting and cold equipment.
•
Renewable energy sources (RES) integration :
1. Electricity will be produced by photovoltaic power station with a supplement by power generating
unit. The photovoltaic installation will have a power of 2’500 WC associated with a park battery
with 55 kWh. Electricity will be distributed in 220 V thanks to an inverter of 4’000 W. This
installation will produce the total needs for the refuge except from the large-scale electricity
consumers (washing machine, dishwasher...). A power generating unit of 10 kVa will ensure the
production of electricity in complement. The cost of the photovoltaic installation is about 50’000
euros (material + installation + transport by helicopter) and will be financed to a total value of 85%
within the programme called “FACE”.
2. The domestic hot water will be also produced by a thermal solar installation. Approximately 20 m²
will be necessary to the production of domestic hot water, a complement being brought by the
propane boiler in the event of prolonged bad weather. The cost of such an installation is about
20’000 euros.
Generally, simple payback cannot be calculated in this case. Indeed, the refuge is located in isolated
site from the electrical network. A photovoltaic installation is essential to ensure the production of
electricity and makes it possible to avoid the creation of a power line. This installation also makes it
possible to limit the operation life of the power generating unit. As for the thermal solar installation, it
makes it possible on the one hand to save propane, but especially to limit the number of rotation of
helicopter (very expensive) necessary to its delivery.
These kinds of measures can be summarised through the following table:
Description
Energy saving
(kWh/year)
CO2 saving
(ton / year)
Economic
saving (€/year)
Investment
(€)
Lighting low 2’500
consumption
(LBC)
Not calculated 450
Refrigerator
1’000
and
freezer
(cat. A)
Not calculated 1’500
PV installation 2’000
Not calculated 50’000
Solar
water
Not calculated 20’000
hot 15’000
Simple payback (years)
ENERGY AUDIT
SUMMARY
« CHATEAU DES AVENIERES »
LODGE’S GENERAL DATA
1. GENERAL DATAS
Name : CHATEAU DES AVENIERES
Adress: Les Avenières – 74 350 CRUSEILLES - FRANCE
Telephone: +33 (0)4 50 44 02 23
Contact person : M. Odin Nicolas
Type of lodge : Hôtel
Use range :
Open periods : whole year
Capacity : 12 rooms
Occupancy rate (%): autumn & winter = 40%; spring = 50%; summer =
80%
LODGE’S DESCRIPTION
•
The Château des Avenières is located on the Southern slope of Salève at 1’000 m of altitude, it was
built in 1907 and was renovated in 1994, that’s a gourmet restaurant, with 12 rooms with individualized
style, a watery basin and a large forest in the immediate vicinity.
•
The architectural style of the Castle is unique, building materials are traditional: stone and wood.
•
Electric power ensures ventilation (simple flow), cold group and lighting. Heating of 1’500 m² and
domestic hot water are provided by two fuel boilers feeding hydraulic systems to air unit heater
(ground floor) and radiators (rooms).
ENERGY DEMAND
•
2 fuel boilers for the heating and domestic hot water of the castle (cumulus volume: 2* 500 L.)
Propane heating system for the staff building (a hundred meters from the castle).
•
Electricity : 160’000 kWh/an: ventilation, lighting, cold rooms; Fuel: 300’000 kWh/an: heating and
domestic hot water; Propane : 6, 5 t/year: additional heating.
•
185 kWh/year/m² for the castle heating (more than 3’000 nights and 8’000 meals per year).
IMPROVEMENT ACTIONS
Rational use of energy (RUE) :
- Centralized programmation and regulation of the heating on station with the reception
- Installation of water meter of the cumulus (knowledge and management of the volume of
domestic hot water)
•
Energy Efficiency :
- Refurbisment of the 1st floor windows: double glazing and door frames.
- Hygroadjustable extractions in the bathrooms (moisture probe starting extraction).
- Balancing of the heating hydraulic systems according to the exposure of the NORTH-SOUTH
frontages: increase in the fluid flow of the Northern circuit and reduction of the fluid flow o in the
Southern circuit.
- Treatment of the steel door, window frames and verandas cold bridges in rooms (installation
of thermal stoppers : specific insulation inside the door frame).
- Choice of low consumption electric household appliances : A or B when replacement of the
old material.
- Installation of low consumption lighting outside.
- Installation of independent shutters with automated closing at the ground and 1st floor
- Installation of thermostatic taps in the staff residence and regulator according to the outside
temperature with external probe in Northern frontage.
- Installation of an isothermic floating cover in night period and/or of cold wind on the surface of
the watery basin, this cover allows a significant heat saving (losses by convection under the
effect of a cold airstream on the surface, by nocturn evaporation and thermic losses)
•
Renewable energy sources (RES) integration :
1. Possibility of installation of thermal solar collectors (plane glazed or “moquettes”) to increase the use
period of the not heated watery basin (surface: 300 m², volume: 330 m3) and to obtain a temperature of
the water from 20 to 25 °C of May 15 at September 15.
2. Project installation of a wood chips boiler with a heat network within the framework of the enlargement of
the hotel (second building): not technically & economically measured.
These kinds of measures can be summarised through the following table:
Description
Solar
Water
Wood
boiler
Energy saving
(kWh/year)
Hot 19’000
chips Not measured
CO2 saving
(ton / year)
4
Economic
saving (€/year)
950
Not calculated
Investment
(€)
20’000
Simple payback (years)
20
ENERGY AUDIT
SUMMARY
« AU BALCON DU LEMAN »
LODGE’S GENERAL DATA
1. GENERAL DATAS
Name : Au Balcon du Léman
Adress: Chez les Vesins – 74 500 THOLLON LES MEMISES - FRANCE
Telephone: +33 (0)4 50 70 23 53
Contact person : M. Yves CHEREAU & Mme Ghislaine GALLAND
Type of lodge : Guest house
Use range :
Open periods : whole year
Capacity : 3 rooms (+ 2 rooms soon)
Occupancy rate (%): 70% for the year
LODGE’S DESCRIPTION
•
The lodge is located in the hamlet of Vesins on the French slope of the Léman lake, 1’000 m of
altitude, this old renovated farm has a table of hosts and 3 rooms with individualized style.
•
The architectural style of the lodge is alpine and traditional, the building materials are traditional :
stone and wood.
•
The electric power ensures lighting. Heating and domestic hot water are provided by a wood chips
boiler located in an additional building in the immediate vicinity. Hydraulic system of radiators ensures
the heating of the 200 m² building.
ENERGY DEMAND
•
1 wood chips boiler for the heating and domestic hot water (cumuus volume: 300 L).
•
Electricity: 3’500 kWh/year: lighting, electric household appliances; Wood chips: 58’000 kWh/year:
heating and domestic hot water;
•
265 kWh/year/m² for the heating.
IMPROVEMENT ACTIONS
•
Rational use of energy (RUE) :
•
Energy Efficiency :
Use of low consumption lighting
•
Renewable energy sources (RES) integration :
- Project of solar thermal installation: 15 m² of plane glazed on the 20 ° Southern roof of the additional
building. It will bring 55 % of the future needs for domestic hot water (main lodge + 5 rooms), about 6’500
kWh/year. The annual economic profit is weak because of the supplement to wood chips at low cost.
The project is interesting for the complementarity’s needs and resources:
- In summer: solar hot water,
- In winter: heating and hot water with wood chips boiler.
These kinds of measures can be summarised through the following table:
Description
Solar
Water
Energy saving
(kWh/year)
Hot 6’500
CO2 saving
(ton / year)
2
Economic
saving (€/year)
300
Investment
(€)
Simple payback (years)
15’000
with 25
50% of public
funds
ENERGY AUDIT
SUMMARY
« REFUGE DE LARIEUX »
LODGE’S GENERAL DATA
1. GENERAL DATAS
Name : refuge de Larieu - THONES
Adress: Les Diacquenot – 74 SAINT MARTIN - FRANCE
Telephone: +33(0)450021952 or +33(0)450603409
Contact person : Albert HOFER
Type of lodge : refuge and mountain pasture
Use range : The lodge is 2 hours walking from a road access. Walkers stay there for one night in
general.
Open periods : June to September
Capacity : 30 beds
Occupancy rate (%): 100% during the week ends, 50% during the weeks
LODGE’S DESCRIPTION
The lodge was built in isolated place at 1’500 m of altitude. It is an old mountain pasture without insulation.
The building is used in summer and welcome mountain walkers (30 beds maximum).
ENERGY DEMAND
As the lodge is not grid-connected to the electricity network, electricity needs are limited ( about 1
kWh/open day). Heating and hot water production are made by a wood cooker, consumption is about 10
m3 / an of rough-hew.
IMPROVEMENT ACTIONS
•
Rational use of energy (RUE) :
The site being not grid-connected, energy consumption is already optimized.
•
Energy Efficiency :
Low Consumption lighting and fridge are used (cat. A)
•
Renewable energy sources (RES) integration :
Renewable energy sources are used for the heating and electricity production.
These kinds of measures can be summarised through the following table:
Description
Solar
Water
Energy saving
(kWh/year)
Hot 2’000
CO2 saving
(ton / year)
Economic
saving (€/year)
300
Investment
(€)
6000
Simple payback (years)
20
ENERGY AUDIT
SUMMARY
« GITE LA FERME DU TOUR – LE GUARREC
»
LODGE’S GENERAL DATA
1. GENERAL DATAS
Name :
Adress:
La ferme du Tour
Chef Lieu – 74440 SERVOZ - FRANCE
Telephone:
Contact person :
Jean Louis LE GUARREC
Type of lodge : Guest house
Use range : during the holidays
Open periods : whole year
Capacity : 4 rooms (6 beds)
Occupancy rate (%): 34 weeks a year
LODGE’S DESCRIPTION
M. Leguarrec is refurbishing an old country cottage on the commune of Servoz at 1’000 m. of altitude, to
create a guest house. This lodge is embed between two other buildings. The original building was built in
1600, in wood material. The guest house will be composed by 4 rooms (6 beds).
ENERGY DEMAND
50’000 kWh/year are used for heating and hot water. Needs are covered by a wood chips boiler installed in
2004. 5’000 to 7’000 kWh/year are used for specific electricity appliances.
IMPROVEMENT ACTIONS
•
Rational use of energy (RUE) : In order to gather heating production, a house close to the
cottage (30 meters) will be feed by a heating network. Heat will be generated by wood chips
boiler. Joint cost are estimated about 6’000 € and will save 1’500 L of fuel.
•
Energy Efficiency : The lodge was entirely refurbished in 2004, especially with insulation.
Lighting and cold systems are also low consumption.
•
Renewable energy sources (RES) integration :
A wood chips boiler was installed to feed the cottage. Soon, a house will be connected to the
heating network. Actually, the boiler is 55 kW and use 50 m3 of wood chips a year. With the
connected house, consumption will be 75 m3 of wood chips. The wood chips are produced from a
close joinery.
These kinds of measures can be summarised through the following table:
Description
Wood
boiler
Heating
network
Energy saving
(kWh/year)
CO2 saving
(ton / year)
Economic
saving (€/year)
Investment
(€)
Simple payback (years)
chips 50’000
3’000
50’000
with 10
40% of public
funds.
25’000
1’500
60’000
4
ENERGY AUDIT
SUMMARY
« GITES DE CHAUNU »
LODGE’S GENERAL DATA
1. GENERAL DATAS
Name :
Adress:
Gîtes de Chaunu
Chemin de Chaunu- 74 150 Marcellaz-Albanais - FRANCE
Telephone: +33 (0)4 50 69 73 04
Contact person :
M. et Mme Martin Jean-Louis et Claudie
Type of lodge : Guest house
Use range :
Open periods : whole year
Capacity : 2 lodges (2*6 people)
Occupancy rate (%): 100% in summer, 50% in winter
LODGE’S DESCRIPTION
The house is composed by 2 lodges in Marcellaz-Albanais, 600 m in altitude. Built in 1993, each lodge has
a kitchen, 3 bedrooms and a quality environment : swimming-pool, countryside, lake and mountains. The
building is a wood construction. Electricity is used for lighting and specific electrical appliances. Heating for
a 150 m2 area and hot water are produced by a fuel boiler feeding hydraulic system and radiators.
ENERGY DEMAND
The fuel boiler produces heating and hot water for the lodges (cumulus volume = 150L).
Electricity : 4’000 kWh/year : lighting, electrical appliance
Fuel : 20’000 kWh/year : heating (100 kWh/year/m²) and hot water
IMPROVEMENT ACTIONS
•
Rational use of energy (RUE) : Using Low Consumption Lighting
•
Energy Efficiency
•
Renewable energy sources (RES) integration :
Project of a solar thermal installation for hot water, on the South-West roof, about 8 m².
These kinds of measures can be summarised through the following table:
Description
Solar
water
Energy saving
(kWh/year)
hot 4’000
CO2 saving
(ton / year)
1
Economic
saving (€/year)
250
Investment
(€)
Simple payback (years)
4’000
with 15
public funds.
ENERGY AUDIT
SUMMARY
« LA MELUSINE »
LODGE’S GENERAL DATA
1. GENERAL DATAS
Name :
La Mélusine
Adress:
49, chemin du Creux – 74 190 Saint-Gervais-les-Bains - FRANCE
Telephone: +33 (0)4 50 47 73 94
Contact person :
M. Lettoli Stéphane
Type of lodge : Guest house
Use range :
Open periods : whole year
Capacity : 20 bedrooms (=50 beds)
Occupancy rate (%): 100% in August and February, 80% in January,
March and July, 60% in Spring, 20% in Autumn
LODGE’S DESCRIPTION
•
The lodge is located in St Gervais les Bains in front of the Mont-Blanc, 900 m in altitude. Built 100 yers
ago, this old cottage has a wide kitchen, 20 bedrooms with traditional alpine style, in the countryside.
•
The architectural style is alpine, construction materials are classical : stone and wood, roof in
corrugated sheet.
•
Electricity is used for lighting and electrical appliance. Heating (450 m²) is ensured by a fuel boiler with
radiators. Hot water is produced by the same boiler.
ENERGY DEMAND
The fuel boiler produces heating and hot water for the lodge (cumulus volume = 500L).
Electricity : 17’500 kWh/year : lighting, electrical appliance
Fuel : 140’000 kWh/year : heating (230 kWh/year/m²) and hot water
IMPROVEMENT ACTIONS
•
Rational use of energy (RUE)
•
Energy Efficiency
•
Renewable energy sources (RES) integration :
Project of a solar thermal installation for hot water, on the South roof. The sun collectors will have to
be clean from the snow regularly.
20 m² of sun collectors will produce 14’000 kWh, so 40% from the needs. A 1’000 L solar cumulus
will feed the supplement cumulus. The solar cumulus and the regulation will be located at the
ground floor close to the supplement cumulus and the fuel boiler.
Invest Cost are 20’000 € HT. Public fundings can reach 50% (Ademe + Rhône-Alpes Region).
Operation Cost include energy consuption for hot water, 0,05 € TTC/kWh for the fuel ressource
(with a 85% output).
These kinds of measures can be summarised through the following table:
Description
Solar
installation
Energy saving
(kWh/year)
16’500
CO2 saving
(ton / year)
5
Economic
saving (€/year)
600
Investment
(€)
Simple payback (years)
20’000
with 15
(with
50%
public fundings)
funds.
ENERGY AUDIT
SUMMARY
« LES MOULINS »
LODGE’S GENERAL DATA
1. GENERAL DATAS
Name :
Les Moulins
Adress:
Gîte Les Moulins – 74 340 SAMOËNS - FRANCE
Telephone: +33 (0)4 50 34 95 69
Contact person :
Mme GABORIAU Mireille
Type of lodge : Guest house
Use range :
Open periods : whole year
Capacity : 15 beds
Occupancy rate (%): 100% in February, July and August, 50% in Spring,
20% in Autumn.
LODGE’S DESCRIPTION
•
The « Château des Moulins » is located in Samoëns, 700 m in altitude. Built in 1880 and refurbished,
it’s equipped with a kitchen, a living room and 15 beds. The Samoëns station (alpine and touring ski,
trekking, alpinism, mountain bike, climbing,…) and the natural site “Cirque du Fer à Cheval” are very
close.
•
The architectural style is alpine, construction materials are classical : stone and wood.
•
Electricity is used for lighting and electrical appliance. Heating (165 m²) and hot water are produced by
a fuel boiler that should be changed as soon as possible.
ENERGY DEMAND
The fuel boiler produces heating and hot water for the lodge (cumulus volume = 2*300L).
Electricity : 8’000 kWh/year : lighting, electrical appliance
Fuel : 45’000 kWh/year : heating (275 kWh/year/m²) and hot water
IMPROVEMENT ACTIONS
•
Rational use of energy (RUE)
•
Energy Efficiency : Use of Low Consumption lighting
•
Renewable energy sources (RES) integration :
Wood chips project :
Yhe wood pellets boiler wil be 35 to 40 kW and will cover the annual needs of 45 to 50’000 kWh. 12
tonnes/year of pellets will be necessary (20 m3/year). The 7 m3 storage area will be located
underground in place of the fuel storage. In winter, autonomy will be 2 months, the delivery can be
operated by a cistern truck with blower pipe, trough an existing hole. A storage of pellets in bags
can be managed if deliveries are not possible. The storage will have to be located in a dry area and
used regularly.
Solar project :
Sun collectors will be placed on the south roof (30° inclination).10 m² will produce 3’100 kWh/year,
about 55% of the annual needs. A solar storage of 500 L will be necessary for the hot water. It will
feed a supplement cumulus (300 L) feeded by a fuel boiler. The solar cumulus and the regulation
will be placed underground close to the supplement cumulus and the fuel boiler.
Hot water savings are estimated about 200 € TTC / year for 10 m² of sun collectors, which
corresponds to 400 L fuel or 1,6 m3 of pellets.
These kinds of measures can be summarised through the following table:
Description
Energy saving
(kWh/year)
CO2 saving
(ton / year)
Economic
saving (€/year)
Investment
(€)
Simple payback (years)
Solar
installation
3’100
2,5
200
9’000 HT with 20 (with funds)
4’000 € of
public funds.
Pellets boiler
5’000
12
500
20’000 HT with 16
8’000 € of funds)
public funds.
(with
ENERGY AUDIT
SUMMARY
« LES RAPILLES »
LODGE’S GENERAL DATA
1. GENERAL DATAS
Name :
Les Rapilles
Adress:
Gîte Les Rapilles – 650 route de Chatillon – 74 970 Marignier - FRANCE
Telephone: +33 (0)4 50 34 63 41 – +33 (0)4 50 34 63 72
Contact person :
M. Jean Léger
Type of lodge : Guest house
Use range :
Open periods : whole year
Capacity : 20 beds
Occupancy rate (%): 100% in summer (6 weeks) and winter (1 month)
LODGE’S DESCRIPTION
•
The lodge is located in Marignier, 500 m in altitude. Built 100 years ago, this huge building is
composed by 2 lodges.
•
The architectural style is classical, construction materials are traditional: stone and wood.
•
Electricity is used for lighting and electrical appliances. Heating (500 m²) is ensured by radiators and a
wood chips boiler (installed in the end of 2005). Hot water is produced by a solar thermal installation
with a fuel supplement at this time and a wood chips supplement soon.
ENERGY DEMAND
The actual fuel boiler produces heating and a part of hot water for the lodge. The boiler will be replaced by
a wood chips one of 70 kW. Hot water is produced by 10 m² of sun collectors (solar cumulus = 750 L) and
completed by the boiler.
Electricity : 7’000 kWh/year : lighting, electrical appliance
Wood chips : 100’000 kWh/year : heating (180 kWh/year/m²) and 50% of the hot water
IMPROVEMENT ACTIONS
•
Rational use of energy (RUE)
•
Energy Efficiency : Use of Low Consumption lighting and electrical appliances
•
Renewable energy sources (RES) integration
These kinds of measures can be summarised through the following table:
Description
No
improvements
necessary
Energy saving
(kWh/year)
CO2 saving
(ton / year)
Economic
saving (€/year)
Investment
(€)
Simple payback (years)
ENERGY AUDIT
SUMMARY
« HÔTEL LE SEMNOZ »
LODGE’S GENERAL DATA
1. GENERAL DATAS
Name : Hôtel Le Semnoz
Adress: Le Semnoz – 74 320 Leschaux - FRANCE
Telephone: +33 (0)4 50 01 23 17
Contact person : M. Couttet Alexandre
Type of lodge : hôtel
Use range :
Open periods : summer & winter (closed from 15/5 to 15/6 and from 15/10
to 15/12
Capacity : 14 rooms
Occupancy rate (%): 90% in February, July & August; 60% in March, June
& December; 30% in January, April, May and September
LODGE’S DESCRIPTION
•
The hotel of Semnoz is located at the top of the station of Semnoz with 1’650 m of altitude; built in
1870 and regularly renovated, the hotel has a restaurant, 14 rooms and an environment of quality:
family winter and summer station (Alpine and Scandinavian ski, mountain pastures, excursions).
•
The hotel architectural style is traditional and corresponds to the beginning of tourism in the Alps of
North, the building materials are traditional: stone and wood.
•
Electric power ensures electric household appliances and lighting. The 600 m² surface heating and
domestic hot water are provided by a fuel boiler feeding hydraulic systems of radiators.
ENERGY DEMAND
•
The fuel boiler produces heating and domestic hot water for the hotel and the restaurant (cumulus
volume: 1’000 L).
•
Electricity: 30’000 kWh/year: lighting, electric household appliances; Fuel: 140’000 kWh/year:
heating and domestic hot water;
•
150 kWh/year/m² for the hotel heating (more than 2’500 nights and of 6’500 meals per year).
IMPROVEMENT ACTIONS
•
Rational use of energy (RUE) :
Actions on the electric subscription: checking of electric consumption, checking of EDF contract.
•
Energy Efficiency :
Actions on the building : Installation of double glazing and treatment of the windows sealing,
installation of air vents in the rooms on the higher door frames of the double windows, balancing of
the hydraulic systems of the radiators.
Actions on the equipment : Insulation of the roof (in under-roof), Installation of a controlled
mechanical ventilation (VMC) simple flow (on outgoing air) in the bathrooms (stops extraction,
ventilation shaft vitiated). Modulation of the air flow can be controlled to the moisture of the ambient
air (hygroadjustable VMC). Installation of low consumption lighting outside and in the night reception.
Insulation of the wood walls of the second floor with mineral, synthetic or natural insulator (possible
technical process : doubling on metal frameworks adapted to the irregular walls). "Désembouage" of
the hydraulic systems of heating (high pressure cleaning of the conduits)
•
Renewable energy sources (RES) integration :
Project of solar equipment: 30 m² of integrated solar thermal collectors in the width of the Southern
roof. Feasibility of the project also depends on a favourable opinion of the commune of LESCHAUX
(declaration of building from the authority) and the Architect on the Building industries on France in
the event of classification or inscription on the site on Semnoz and/or the hotel. The installation of
thermal solar collectors for the production of Domestic hot water (ECS) of the Hotel can cover up to
50 % of the annual needs for ECS. - the orientation of the roof (full South) is optimal. - the surface
of sensors inclined according to the slope of the roof (45°) would be 30 m², the sensors would be
posed above the sheet cover, the installation of a thermal solar installation will make it possible to
preheat domestic hot water of the hotel in all seasons and to heat it in summer, the orientation and
the slope of the roof make it possible to obtain a great productivity of the sensors, the time of return
on investment is thus relatively interesting (13 years).
These kinds of measures can be summarised through the following table:
Description
Solar
Water
Energy saving
(kWh/year)
Hot 6’500
CO2 saving
(ton / year)
2
Economic
saving (€/year)
300
Investment
(€)
Simple payback (years)
15’000
with 25
50% of public
funds