Context
Rexol is a new operation that our association AGEDEN conducted for the municipalities for two years. We did this action for a dozen projects.
What’s Rexol and why?
Duration: 4 days per project.
Targets : “tertiary public” operation preferably delivered (if possible with minimum 6 months operation) and having a technical interest (overall rehabilitation, innovative system ..).
Component 1: Record detailed Site
Obtain an inventory detailed of technical s solutions which have been implemented with pictures and a possible interview of the owner.
Component 2: Financial Engineering
Collect the distribution of prices charged by consignment and compare. Identify and comment on any differences if necessary. Study the financial package.
Part 3: Return of the construction phase
Retrieve and analyze the differents price lists.
Collect the felt of the owner in the conduct of site (difficulties, time available, trade with team…) .
The conditions for the delivery of equipment (explanations for example).
Component 4: Building Use
Analyze the operating costs of the building (P1 and P2), compared with the theory and explain.
Identify potential adaptations , modifications or replacements of equipment upon receipt and explain the causes.
Analyze occupant comfort in summer / winter period with the possibility of laying recorders t ° C if perceived problems or use the thermal camera (without interpretation ) for information if doubts exist on the implementation.
An example of project. The nursery of Montbonnot.
The city of Montbonnot as the Community of Communes Gresivaudan is very sensitive about the environment, energy savings and renewable energy. In 2010, the municipality has launched a very good operation in terms of environmental and energy performance by choosing to build a small child very innovative on the energy aspects.
This particular building is equipped with various innovative, efficient and making use of among other local sources of renewable energy.
The hot water is produced by the installation of solar panels and green electricity is produced by photovoltaic panels.
The building is also equipped with a VMC double flux linked with a Canadian wells to ensure both the heating, cooling and ventilation.
What we did.
A campaign of temperature measurements will be carried out during summer 2013 and winter 2013/14. These campaigns focus on measures ambient temperatures, humidity inside the CO2 and external measurements of temperature and humidity for the winter party.
In light of all of these measures and these tests, and according to the report by The AGEDEN, it will be investigated the possibility of implementing a hygro-adjustable air humidifier standing on the double CTA stream or another independent system CTA.
Test and Measurements
During 1 month of measurements and recording of humidity, temperatures and rate of CO2 dispatched in all room.
Types of material:
4 temperature probes Voltcraft ®
1 probe humidity and temperature Voltcraft ® (No. 4)
Four temperature sensors Testo ® (No. 1.3, 9, 10)
1 probe humidity and temperature Testo ® (6)
1 recorder CO2 / humidity and temperature Kilog Kimo ®
5 meters humidity non recorders hand display and manual readings by the staff.
Results and analysis
– Analysis of CO2
The values of CO2 concentration also vary proportionally with temperature humidity which is logical because the CO2 is directly dependent on occupancy rates and containment. Recall that CO2 levels too high (> 1700 ppm) may be indicative of inadequate ventilation and it may be necessary to open the windows to air a few minutes.
Whatever we see through these measures (a month at a time of 10 mins time steps) that CO2 is often high, which may indicate a ventilation / insufficient ventilation.
– Analysis of heating temperatures
Temperatures are correct for the needs of a nursery, they are rather homogeneous and generally constant and thermal comfort is pretty good after this month measurement. There is therefore no discomfort at this level .
It would be inappropriate to criticize these values in terms of energy economy that we promote as we have no knowledge of ideal temperatures for child. However, doctors often report should not exceed 17° C during the rest to avoid problems with cold.
Temperature control at night and weekends seem well done based on intermittent, however, we think, that period of holidays, the reduced is low and it would be useful in terms of optimizing consumption the lower energy below 18 ° C.
– Analysis of humidity
The humidity varies proportionally to the temperature is very low, sometimes it even goes below 20 % which shows that the air is very dry.
Implementation humidifiers has increased considerably humidity, even the lowest values were doubled from 24 % to 48 %.
Recall again that the optimum humidity is between 40 and 60% without regulation or requirement.
When removing probes, personal home early childhood have informed us that they are very satisfied with humidifiers and since they were established they no longer have itchy eyes and have more sore throat.
We recalled the hygiene regulations / essential maintenance to be carried out with these devices to prevent bacterial risk and we discussed with the Technical Services of the Municipality on the fact that humidifiers are only a temporary solution pending work CTA (enthalpy membrane).
We also discussed with the technical service on the need for regular maintenance dual flow ventilation and regularly change the filters, the City has a maintenance contract with a maintenance company now.
