Case study - The project of comfort - Indoor environmental quality and comfort perception in of

4 The project of comfort

4.2 Case study

The office under study is located in the first floor of the headquarters of ARPA Valle d’Aosta (Agenzia Regionale per la Protezione dell’Ambiente Valle d’Aosta) in Saint-Christophe (AO).

Figure 13: orthophoto of ARPA Valle d’Aosta.

Figure 14: office plan, first floor, scale 1:100.

LOCATION Country: Italy

City: Saint-Christophe (AO) Latitude: 45.735° N

Longitude: 7.351° E

Altutude above see: 552.0 m Climate zone: E

BUILDING

Construction years: 2002-2005 OFFICE UNDER STUDY First floor plan

Volume: 130 m³ Floor surface: 49 m²

The office faces south, towards the internal courtyard. Opposite, at a distance of 5 meters, there are two trees.

0 0.5 1 3

4.2.1 Office features

Figure 15: photo of the office. Source: “Qualità dell’ambiente interno e comfort globale:

misure in campo ed analisi nella sede dell’ARPA della Valle d’Aosta” (Oggiani, 2020).

Figure 16: photo of the office. Source: “Qualità dell’ambiente interno e comfort globale:

misure in campo ed analisi nella sede dell’ARPA della Valle d’Aosta” (Oggiani, 2020).

Figure 17: office view.

Figure 18: Survey features presented in “Qualità dell’ambiente interno e comfort globale:

misure in campo ed analisi nella sede dell’ARPA della Valle d’Aosta” thesis (Oggiani,

Exposure:

south Overlooking:

courtyard

N 5 windows Double glass Aluminium frame

Integrated window shading:

internal blinds External window shading:

drop arm awning

2 system terminals:

fan coil

6 luminaires Fluorescent light

bulb

Acoustic ceiling N. occupants

3 N. PC

4.2.2 Opaque and transparent envelope

The office stratigraphy of opaque envelope has been composed using the information about construction typology, period of construction of the building (years 2002-2005) and by means of the UNI 11552:2014, because specific data on materials and layers thicknesses were not available.

The only available information was related to the typology of stratigraphy:

concrete panels have been used for this building construction. Furthermore, it is known that false ceiling with a layer of fiberglass insulation has been added after the building construction in the roof package.

Starting from this knowledge, in standard UNI 11552:2014 have been detected the most proper stratigraphy for each technology package.

The only information owned about windows is that are made up of two glasses and by aluminium frame.

4.2.2.1 Abacus scale 1:20

12 34 5 67 8 9 1011 12

ROOF

Thikness: 60.00 cm U-value: 0.44 W/(m2K)

Rw: 68.00 dB _{3.0 cm}

2.0 cm 1.0 cm

2.0 cm 2.0 cm 4.0 cm 16.0 cm 2.0 cm 20.0 cm 4.0 cm 2.5 cm 1.5 cm 1. Outdoor flooring

2. Polystyrene insulating panel 3. Bituminous

waterproofing membrane 4. Concrete screed 5. Cement mortar 6. Reinforced

concrete

7. Concrete beams-brick blocks 8. Render 9. Air

10. Fibreglass 11. False ceiling

structure 12. Gypsum

REALIZZATO CON UN PRODOTTO AUTODESK VERSIONE PER STUDENTI

5 1 2

1. Gypsum 2. Cement mortar 3. Fibreglass 4. Concrete 5. Render

3.0 cm 1.0 cm 4.0 cm 27.0 cm 2.0 cm EXTERNAL WALL

Thikness: 37.00 cm U-value: 0.58 W/(m2K) Rw: 35.80 dB

REALIZZATO CON UN PRODOTTO AUTODESK VERSIONE PER STUDENTI

REALIZZATO CON UN PRODOTTO AUTODESK VERSIONE PER STUDENTI REALIZZATO CON UN PRODOTTO AUTODESK VERSIONE PER STUDENTI

3 1 2

1. Gypsum 2. Air 3. Gypsum INTERNAL WALL

Thikness: 13.00 cm Rw: 42.90 dB

3.0 cm 7.0 cm 3.0 cm

REALIZZATO CON UN PRODOTTO AUTODESK VERSIONE PER STUDENTI

REALIZZATO CON UN PRODOTTO AUTODESK VERSIONE PER STUDENTI REALIZZATO CON UN PRODOTTO AUTODESK VERSIONE PER STUDENTI

1 2

3 4 5

1. Ceramic tiles 2. Cement mortar 3. Concrete screed 4. Predalles lattice

slab (concrete, 5. RenderEPS)

INTERNAL SLAB Thikness: 31.00 cm Rw: 51.00 dB

1.0 cm 4.0 cm 24.0 cm

2.0 cm

4.2.2.2 Window properties

Figure 19: current state window and shadings properties

4.2.3 Data monitoring

The measurements taken from the thesis work “Qualità dell’ambiente interno e comfort globale: misure in campo ed analisi nella sede dell’ARPA della Valle d’Aosta” (Oggiani, 2020) are related to the physical quantities that are used to evaluate indoor comfort, with reference to standard EN 16798.

The monitoring period is between 18/08/2020 and 03/09/2020. The period of daily employment by workers is between 9:00 and 17:00, from Monday to Friday.

The measurements were differentiated into two types: continuous measurements and punctual measurements. The former refers to physical quantities monitored over the working hours for three consecutive days in all three weeks. The punctual measurements, on the other hand, refer to physical quantities monitored in three specific days (18/08/2020, 24/08/2020 and 02/09/2020) and used to obtain the environmental indexes present in the legislation and useful for the assessment of indoor environmental comfort.

External shading Drop arm awning Internal shading Internal blinds Frame

Aluminium Glass

Double glazing, air in cavity SHGC: 0.76

t: 0.7 tvis: 0.81

It must be noticed that the monitoring survey was carried out during the Covid-19 pandemic period, thus air conditioning system was kept switched off to reduce the circulation of the virus.

In Table 14 are presented the physical parameters monitored.

Table 14: punctual and continuous monitoring of physical parameters. Source: “Qualità dell’ambiente interno e comfort globale: misure in campo ed analisi nella sede dell’ARPA

della Valle d’Aosta” (Oggiani, 2020).

THERMAL DOMAIN

Indoor air temperature T_i [°C] Punctual and continuous measure

Outdoor air temperature T_o [°C] Continuous measure Indoor relative humidity RH_i [%] Punctual and continuous

measure Outdoor relative humidity RH_o[%] Continuous measure Mean radiant temperature T_mr [%] Punctual measure

Air velocity V_a [m/s] Punctual measure INDOOR AIR QUALITY

CO₂ concentration CO₂ [ppm] Punctual measure Volatile organic

compounds VOC [μg/m³] Punctual measure Particulate matter: PM₁,

PM_2.5, PM₁₀

PM₁, PM_2.5,

PM₁₀[μg/m³] Punctual measure ACOUSTIC DOMAIN

Equivalent continuous

sound pressure level L_,A,eq [dB(A)] Punctual and continuous measure

Reverberation time T₃₀ [s] Punctual measure VISUAL DOMAIN

Average illuminance E [lx] Punctual measure

Nel documento Indoor environmental quality and comfort perception in offices (pagine 89-96)