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Prof. YANG Hongxing Department of Building Services Engineering, The Hong Kong Polytechnic University06-03-2021 Chapter 4 Part IPassive Solar Energy Applications in Buildings
What are passive solar buildings?Constructional elements for residential buildingsHow does passive solar design use the suns power?Main types of passive buildingsPotential of applicationsPassive solar in the worldApplications in Hong Kong
In PASSIVE SOLAR BUILDINGS, windows, walls, and floors are made to collect, store, and distribute ’SOLAR ENERGY’ in the form of heat in the winter and reject solar heat in the summer.
Passive House PrinciplesThermal insulationThermal bridge freedesignProper ventilationAirtight buildingenvelopePassive HousewindowsAmina LangPassive House: an urban solution October 20, 2016
Placementofroom-types, internal doors & walls, & equipment in the house;Orienting the building to face the equator;Extendingthe building dimension along the east/west axis;Adequately sizing windows to face the midday sun in the winter, and be shaded in the summer;Minimizing windows on other sides, especially western windows.Using thermal mass to store excess solar energy during the winter day(which is then re-radiated during the night).
Procedures for design of buildings to passively use solar energy for heating buildings may typically involve:Use of shading devices to reduce heating by radiant (solar) energy in the summer and allow it in winter;Utilize thermal convection (i.e. hot air rises) to maximize heating by convection inwinter, andUtilizethermal storage (mass-effect)to transfer excess heating capacity from daylight to night time hours.
AwningsBlindsVenetianblindsShuttersBinsDesign of buildings to passively use solar energy for cooling
Direct GainIndirect GainDay lightingCooling
Passive Solar Energy Concept1. Solar HeatingDirect gain system Air collector systemAir flow windowsMass wall systemTransparent insulation systemAbsorber wallStorage wall
Passive Solar Energy ConceptTwo Broad Categories:Use sun energy to directly or indirectly impact the thermal need(heating or cooling)Use sun energy to directly impact the lighting needsin the built environment
Typical AspectsCollectionThrough windows and/or solar aperturesStorage (Heating)Structural massDistribution & ControlFormed by the shape, size and location of rooms in buildingControlLighting sensors
Adoption of Passive Solar SystemPassive Solar Energy Application is integrated with the building fabric designNew building project: Architectural design stageExisting building: Retrofit may involve the re-construction of building fabric.
HeatingDirect gain with storageDirect gain without storageIndirect gainCoolingIntegrated with ventilation strategiesPassive Concept Thermal System
Passive HeatingUse heat from the sun to offset winter heating needsCollection system

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Passive solar, Passive solar building design

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