828
C. Faé et al.
to be used for the implementation of the complete system were surveyed in the
local commerce, and a comparison was made between the cost of the work and the
expected time of return for the project.
The period of return of the investment was calculated considering the unpredictability of the rain and frequency of daily use of the air conditioners. For the
calculation of the return of the system based on the apparatuses was considered the
monthly water generation of the same multiplied by the tariff of the concessionaire. The value found represents the monthly savings, which was deducted from the
amount invested, thus obtaining the expected term.
The calculation of the return period of the rainwater system considered that the
volume of 15,000.00 L of the reservoir multiplied by 5.61, which is the rate applied
by the local Company of Treated Water and Supply, CESAN, for volumes up to
15.00 m
3 . Due to the imprecision related to the randomness of the hydrological
phenomena, it was considered to calculate the occurrence of 50 mm of rain on the
roof monthly, which would represent a value of 16,000.00 L captured by the studied
area. Therefore, for academic purposes, the capacity of the reservoir in the calculation
of the period of return of the investment was adopted.
5 Results and Discussion
Roof dimensions were obtained using AutoCAD software. Through the pavilion
plants, a length of 55.45 m and a width of 9.73 m was found for corrugated tiles,
with a slope of 17% and a height of 1.02 m. The rail is 50 cm wide. With the inspection
of the roof it was possible to perceive the existence of seven pipes of descent of the
rainwater, and among these, only two present the pipe visible and the other five are
embedded in the construction. Furthermore, it was found that the roof is divided in
half by two concrete obstructions in the larger rails. The visit to the roof also identified
a large accumulation of leaves in the gutters. The accumulation of leaves can cause
obstruction of the flow section and, if routed to the cistern, directly interfere with
the water quality, mainly increasing the content of organic matter and, consequently,
resulting in the presence of microorganisms, which may be pathogenic due to the
feces of birds and rodents.
There were 38 air conditioners counted, including two types and five brands
(Table 1). The split models correspond to 18 devices (47% of the total) while the
window models are represented by 20 devices (53% of the total). Among all models
observed, only two present different power of 18,000 BTU/h, both models being split
of the Carrier brand.
The 38 apparatuses observed in the study were installed in 18 rooms, and the
Department of Mathematics was the responsible for six window models of the
Springer brand. Of all the rooms classified as office of the Head of Department,
it has the largest area and the largest number of people attending. In fact, of all
rooms, those that presented constant frequency of use during different days and in
different periods of the same day were those of the Head of Department.
C. Faé et al.
to be used for the implementation of the complete system were surveyed in the
local commerce, and a comparison was made between the cost of the work and the
expected time of return for the project.
The period of return of the investment was calculated considering the unpredictability of the rain and frequency of daily use of the air conditioners. For the
calculation of the return of the system based on the apparatuses was considered the
monthly water generation of the same multiplied by the tariff of the concessionaire. The value found represents the monthly savings, which was deducted from the
amount invested, thus obtaining the expected term.
The calculation of the return period of the rainwater system considered that the
volume of 15,000.00 L of the reservoir multiplied by 5.61, which is the rate applied
by the local Company of Treated Water and Supply, CESAN, for volumes up to
15.00 m
3 . Due to the imprecision related to the randomness of the hydrological
phenomena, it was considered to calculate the occurrence of 50 mm of rain on the
roof monthly, which would represent a value of 16,000.00 L captured by the studied
area. Therefore, for academic purposes, the capacity of the reservoir in the calculation
of the period of return of the investment was adopted.
5 Results and Discussion
Roof dimensions were obtained using AutoCAD software. Through the pavilion
plants, a length of 55.45 m and a width of 9.73 m was found for corrugated tiles,
with a slope of 17% and a height of 1.02 m. The rail is 50 cm wide. With the inspection
of the roof it was possible to perceive the existence of seven pipes of descent of the
rainwater, and among these, only two present the pipe visible and the other five are
embedded in the construction. Furthermore, it was found that the roof is divided in
half by two concrete obstructions in the larger rails. The visit to the roof also identified
a large accumulation of leaves in the gutters. The accumulation of leaves can cause
obstruction of the flow section and, if routed to the cistern, directly interfere with
the water quality, mainly increasing the content of organic matter and, consequently,
resulting in the presence of microorganisms, which may be pathogenic due to the
feces of birds and rodents.
There were 38 air conditioners counted, including two types and five brands
(Table 1). The split models correspond to 18 devices (47% of the total) while the
window models are represented by 20 devices (53% of the total). Among all models
observed, only two present different power of 18,000 BTU/h, both models being split
of the Carrier brand.
The 38 apparatuses observed in the study were installed in 18 rooms, and the
Department of Mathematics was the responsible for six window models of the
Springer brand. Of all the rooms classified as office of the Head of Department,
it has the largest area and the largest number of people attending. In fact, of all
rooms, those that presented constant frequency of use during different days and in
different periods of the same day were those of the Head of Department.