The present draft report deals with the analysis and the preliminary elaboration of data and information collected during the audit of the shop of Mr. Ivan Buenano Fierro. The audit data permitted to determine the monthly and yearly building consumption, to compare them with the invoiced yearly consumption and to estimate the percentage weight of each systems or appliance in the total consumption of the shop. Afterward a preliminary identification of some possible RES/RUE interventions in the shop will be carried on in order to lower both energy consumption and load.

Architectural general description

Mr. Ivan Buenano's shop is in located in the Avenida Alsacio Northia an important street of Puerto Baquerizo Moreno. In the surroundings there are few buildings of shorter height.
The shop takes up the ground floor of one storied building in the first floor of which there is the house of Mr. Ivan Buenano (see fig.1). The shop has a square shape and its main entrance facing East is shaded by a yellow awning 4 square meters large. General information about the building are reported in table 1.

Parameter Value Description
Site area, m˛101 Total lot area
Area of foundations, m˛ 101 Area of typical floor
Green Areas, m˛0 Green Areas
Height of typical floor, m 3 Height of typical floor
Number of floors 1 Number of floors, ground floor included.
Number of basement floors 0 Number of floors, below ground floor.
Gross floor area, m˛ 101 Gross floor area (basement included)
Heated floor area, m˛ 0 Heated floor area
Conditioned area, m˛ 0 Conditioned area
Installed heating power, kW
(Thermal) 0 Installed heating power
Installed cooling power (thermal), kW 0 Installed cooling power (thermal)
Installed electrical cooling power 0

Table 1

Construction

The building has a reinforced concrete structure. The external walls consist of perforated concrete blocks 13 cm thick with an external finishing of light coloured plaster. The building has an asbestos cement roofing mounted on a light wood structure (see Fig.2). The floor is made of ceramic tiles placed on concrete slabs 10 cm thick. All of the windows are single pane with aluminium frames and are protected by external iron gratings (see fig. 3).
In Galapagos islands roofs and external walls do not have thermal insulation materials and generally they have light structures with low value of thermal capacity, consequently the U-value of external walls is in the range of 3-3.5 W/m2 °C.
Indeed high thermal mass and thermal insulation are not required in the constructions of Galapagos Islands due to the mild climate without strong temperature changes.

Lighting systems

In the shop there are 3 standard incandescent luminaires and 2 tube fluorescent lamps (see fig. 4).
A complete list of lighting typologies used in the shop, their number, electric power, locations and daily use is reported in table 2.

Internal type External type Power (Watt) Daily use (h)
Tipo/N#/W Tipo/N#/W
1/3/100 100 5Hr/day
3/1/20 3/1/40 20/40

Type of existing lamps
1: standard incandescent,
2: efficient incandescent,
3: tube fluorescent,
4: compact fluorescent,
5: discharge,
6:other

Table:2 Lighting systems in the shop

Ventilation system

In Galapagos the climate is much humid with a relative humidity ranging in between 75-80% all over the year. It needs ventilation inside the interior spaces for removing moisture causing an additional cooling load.
In the shop there is a ceiling fan for ventilation purposes. The fan absorbs 75 W and is in operation 8 hours per day in the hot months (December through May)(see fig.5).

Refrigerators and freezers

This kind of shop is quite common in Puerto Baquerizo and sells meat, fish and other foodstuffs.
It is equipped with two freezers and one refrigerator to store the foodstuffs (see Fig. 6,7, and 8). The technical specification of these machines are missing.
The freezers look quite old and it can be estimated a daily energy consumption of 2000 Wh each.
More or less the same daily consumption has been ascribed to the refrigerator.
The shop is open every day of the week from 9 a.m to 8 p.m.

Additional electrical appliances

The 2 or 3 persons who work in the shop use for 2 hours per day a radio and a television.
The shop is provided with a booster pump (600 W) for the water supply (see fig. 9).

Electric energy consumption

The electric utility (EEPG) provided for the shop the electric consumption and related bill referred to the period January 2002 to July 2003 as reported in table 3.
Table 3 shows that in the year 2002 the summer average monthly consumption are double in respect to the winter ones (328 kWh vs 166 kWh). It is well known that both freezers and refrigerators consume much more energy in summer in respect to the winter, but, furthermore, probably in summer the shop uses more often freezers and refrigerators because of the higher number of tourists. Table 3 shows also a strong deviation on the energy consumption between 2002 and 2003 summer. The average monthly consumption invoiced in summer 2003 is 52 % higher than that referred to summer 2002 . This very strong deviation is not easily explicable only by some climatic effect (was summer 2003 much hotter than summer 2002?). In reality a deviation between 2002 and 2003 summer consumption even if of smaller amount has been noticed in many other buildings belonging to different user categories (Residential, hotels, public offices). Unfortunately it is not possible to provide a final answer since we do not have the 2002 climatic data for making a comparison.
An analysis of the typology of energy consumption has been done through the information and data collected during the energy audit in the shop.
Table 4 summarises the results of the data analysis.
The following comments and consideration arise from the results reported in table 4:

1) Due to the anomalous deviation of 2003 invoiced consumption data, it is better to limit the considerations to the year 2002. The data analysis done in table 4 in terms of global yearly energy consumption is very close to the 2002 billed energy consumption : 3143 kWh (table 6) vs 2998 kWh (billed consumption).
There is also a very good agreement between the analysis results and the invoiced consumption for the monthly average summer consumption and for the monthly average winter consumption.

2) According to the data analysis the main source of consumption in the shop is given by the refrigerating systems for the food storage. Freezers and refrigerator account for about 46 % of the total yearly consumption. Since these machines look quite old their replacement with new and more efficient systems could reduce of about 50 % the related energy consumption with a global yearly energy saving of about 23 %. The choice of the energy class of the refrigerators (the class specifies the efficiency and the energy saving) requires a cost/benefit analysis considering that the cost of a new machine increases with the energy efficiency.

3) Lighting systems account for about the 20 % of the building yearly consumption. It would be certainly better to replace the existing incandescent lamps with fluorescent low consumption lamps.
The replacement of the incandescent lamps with fluorescent tube luminaires leads to a yearly energy saving of 60 % in the lighting and to a yearly global energy saving of 12 % .

4) The interventions on lighting and refrigerators would produce a yearly global energy saving of about 35 % in the shop. However only a careful cost/benefit analysis will exactly determine the global advantage of the interventions.

Year Month Elec.Cons.
kWh
2002 1 318
2002 2 380
2002 3 365
2002 4 210
2002 5 366 327.8 Average Summer 2002
2002 6 332
2002 7 291
2002 8 146
2002 9 132
2002 10 119 166 Average Winter
2002 11 143
2002 12 196 2998 Total 2002
2003 1 254
2003 2 415
2003 3 384
2003 4 917
2003 5 824 498 Average Summer 2003
2003 6 838
2003 7 716 387 Total Average
7346 Total 2002 - 2003

Table3:Electric energy consumption of the shop(EEPG invoice)

Appliances Month.Cons YearlyCons. Spec./tot.
Wh kWh %
Lamps
Std. Incand. 45 540
Tube fluoresc. 9 108
Total lamps 54 648 20.6
Radio 1.62 19.44
Television 5.28 63.36
Total media syst.6.9 82.8 2.6
Refrigerator 60 720
Freezer 60 360
Freezer 60 360
Total Refrigerat180 1440 45.8
Ventilation Fan 18 108
Water buster 72 864
Total Techn. Syst.90 972 30.9
Gran total 331 3143 100

Table 4: Estimated consumption of the shop