Latvia, Riga Technical University

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PASSIVE ARCHITECTURAL COOLING FOR THREE STOREY OFFICE BUILDING DESIGN CONCEPT RTU Working group: KRISTAPS SAFRANOVS, JURIS SOROKINS, NATALY KUZNECOVA, JEKATERINA NAZAROVA, JANIS LUSIS ALEKSANDRS ZAJACS

PASSIVE BUILDING DESIGN PRINCIPLE

W Conventional design N E S Integrated design SHAPE • SOLAR PATH • SUSTAINABILITY

BUILDING ENVELOPE

Key Features:  Structural support  Thermal resistance  Controls  Aesthetic

BUILDING ENVELOPE

North facade South facade

DAYLIGHT FACTOR

2-5%

ILLUMINATION OF ROOMS

December 24th June 24th March 24th

RIGA SUN PATH

INTERNAL COMFORT Comfort of the work environment:

– Solar gain – Glare (contrast)

North facade South facade

EXTERNAL EXPOSURE FACTORS

• • Outside temperature Climate • • Solar radiation Sun path • Wind

EXTERNAL EXPOSURE FACTORS Wind pressure

P v = 0.5 * ρ l * v 2 ref

Pv –wind pressure, Pa; ρl – air density , kg/m3.

V ref = V meteo * k * h a

V meteo – known wind speed in certain area, m/s; k – factor depending on terrain (0,68 – open flat terrain, 0,21 – megalopolis); h – height from the ground surface to the air intake, m; a – factor depending on placement (0,17 – shore line, 0,33 - city).

• • • • • •

CONCLUSIONS

Building is elipse-shaped which gives the best area of the envelope /building space ratio and adapts to the sun path; Increased proportion of glazed facades benefits daylight factor and has a positive impact on residents' health, wellbeing and productivity; At the same time this increase cooling load of working space, that's why office area is located on the North side Building use reflected sun light instead of direct, which reduse glare effect; The use of atrium contributes building sustainability by provision of natural ventilation; The aim of the architectural passive cooling is achieved by setting correct lines of action – BUILDING SHAPE, SOLAR PATH, SUSTAINABILITY.

PASSIVE ARCHITECTURAL COOLING FOR THREE STOREY OFFICE BUILDING DESIGN CONCEPT RTU Working group: KRISTAPS SAFRANOVS, JURIS SOROKINS, NATALY KUZNECOVA, JEKATERINA NAZAROVA, JANIS LUSIS

ALEKSANDRS ZAJACS

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