15 May 2014

Passive Solar House in Hot & Humid Areas

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Essence of Solar House for hot & humid climate

  • 1. In front of the house should face to the North side so that sun will not hit north and south side of the house with eaves.

    sun orientation for passive house

    sun orientation for passive house

  • 2. Double Wall and Roof to protect direct hit from the sun to the building, cover east and west side of the wall and the roof.

    double roof for insulation

    double roof for insulation

  • double wall for insulation

    double wall for insulation

  • 3. Use airflow, hot air going up and cool air going down, It cools the house effectively
  • http://coolairaustralia.com/wp-content/uploads/2014/05/temperature-difference-night.png
  • airflow to cool building during day

    airflow to cool building during day

  • 4. Bring cool air into the basement at night and use daytime for cooling rooms.

    store night time air into basement

    store night time air into basement

General guidelines for designing your house:

Never Use 2 x 4 Wooden Exterior Walls On 16” Centers – 2 x 6’s on 24” centers are better, we recommend “Tree Free” construction – use less wood, cost less, and allow more insulation. Use simplified 2-stud corner details, wall intersections, etc. Other non-wood alternatives have many advantages over wood framing. There are many modern good reasons to not use wood to frame a home.

Never Use Log Home Exterior Walls – Wood has much less-insulating effect per inch than other superior less-expensive materials, and logs waste a large quantity of a dwindling natural resource. Killing trees is bad for the environment and increases Global Warming.

Never Design A Long Distance Between Hot Water Source and Faucet – Wastes time, water, and energy to heat the replacement water. Use plumbing clusters (and possible re circulation just before hot water usage).

Never Design A Frequently-Used Single Exterior Door . One door is shut before the next is opened, reducing the large volume of air infiltration on windy days.

Never Use Much Glass on a single-shell portion of the house – It is like a thermal hole in your walls. Coolair’s double shell design allows much more glass, daylight and views, with less undesirable heat transfer. Two small Delta T’s are better than one large Delta T.

Never Use Incandescent Lighting –. Fluorescent LED lighting is much more efficient, but most of them have undesirable color temperature.

Never Run Electrical Wiring or Plumbing In Any Exterior Wall – They create poor insulation and air infiltration holes in the building thermal envelope. They can be run in the interior walls that are perpendicular to the exterior walls, or in air-sealed floor outlets, etc. All perforations in the building envelope (including interior wall / ceiling / attic / plumbing / electrical / lighting) must be carefully sealed and inspected. The goal is to eliminate unplanned air infiltration.

Never Design An Open Staircase Or Loft Area in the air-conditioned portion of a building – Warm air rises like a hot air balloon. The upstairs will ALWAYS be either too hot, OR the downstairs will be too cool (or both). A staircase should have a door at the bottom (preferred) or at the top. The staircase may have optional glass looking into a great room for visual appeal. Glass elevators are nice in more-expensive homes.

An open staircase or balcony works well in a double shell thermal buffer zone (sunroom) where a convection airflow loop is engineered to automatically equalize upper and lower temperature differentials.

Never Overlook Any Of The Critical Human Comfort Issues – Temperature PLUS humidity (enthalpy), oxygen and CO2. Intelligent Heating Ventilating and Air Conditioning (HVAC) sensors and controls are desirable on larger homes and commercial buildings. Inexpensive intelligent programmable zoned HVAC with multiple sensors and controls can be used to help balance comfort factor differentials north/south, east/west, morning/afternoon, upper/lower, inside/outside, etc. – improving comfort while greatly reducing energy requirements.

Never Use Roof-Angled Glass (Skylights)– They create a Solar Furnace in the summer. In the winter, warm air rises and heat is rapidly lost through the cold conductive glass. Roof angled glass is always bad everywhere in every season. Eve n on sunny winter days, roof angled glass provides LESS solar gain than vertical south facing glass (in the northern hemisphere).

Never Use A Fireplace or A Clothes Dryer In Air-Conditioned Living Quarters- They suck out your expensive clean conditioned air.

For free consultation conduct us at info@coolairaustralia.com