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    Popheat Popheat Presentation Transcript

    • Solar – just for fun• The sole purpose of this project is to experiment with possibilities for solar space heating.• Unlike a normal experiment, I knew what I wanted to do so I looked for a problem that would fit the solution.• The process is documented in a classroom format as an easy way to communicate it to others that may be interested.• A special thank you to my wife and daughter for tolerating pop cans, power tools, and spray paint in the house.
    • AET290 Unit 1 Slide 12 A DIY Response
    • Identify the problem• Master Bedroom is too cold during the day• Temp is ok at night• Bedroom is at the farthest point from the central furnace• The rest of the house is OK during the day
    • Brainstorm• Space heater – too noisy and costly• Turn up the thermostat – rest of the house would be too warm• The room has south facing window – develop a solar collector to heat the room
    • Design• Adapt a 2nd generation hot box to fit the window• Pop can style collector• Use the cans as independent chimneys• Passive air flow• Old window is usually cold, anything is an improvement
    • Safety first !!!• Safety glasses• Ear protection• Leather gloves
    • Build – 1st round The first step was to puncture holes in the bottom of the cans. The logic was to let the air through slowly in an attempt to collect as much heat as possible from the cans
    • Assembly No alterations were made to the can tops. The cans were glued together with hot glue and then painted black
    • The chimneys • Each chimney would consist of 14 cans, each can vented though the bottoms. • The bottom can has a hole in the side to allow fresh air intake
    • Test and Evaluate• 8 chimneys were assembled in this fashion• The chimneys were placed on the window sill between the curtain and the glass• Δt was impressive, each chimney averaged a 40° rise in temp and they peaked at 60°• Airflow was not measured so BTU calculations were not possible• Very little air flowed through the chimneys and they began to self destruct at 135°
    • Qualitative results• The room was -4° relative to the central thermostat• With the chimneys the room is +4°• The room is 15x15x10’• I consider this performance OK, I expected better
    • Redesign – improve air flow • The bottoms of the cans were cut out completely using a 1 5/8” hole saw • The tops were roughly cut completely away using a Roto Zip cut out tool
    • New Logic • Each joint inside the chimney will cause a turbulence in the air flow • This turbulence will be enough to aid the heat transfer from the chimney to the air
    • Assembly line production • 14 cans are laid in place • The joints are glued 1/3 of the circumference then the whole chimney is rotated • Repeat glue procedure twice so all joints are 100%
    • Henry Ford • In the spirit of assembly line productions • “you can have your chimney in any color, as long as it is black” • The second set of chimneys are ready to go to the window
    • Tools usedHot glue gun The foam can coolers are perfect to hold the cans while tooling, non slip and protects your hands
    • Tools used3/8” electric drill with 1 5/8” hole saw bit Roto Zip cut out tool, Dremel Would work also
    • What about next summer?• My wife’s first question• Probably divide the chimneys into 2 or 3 modular units• Mount them into a traditional black box• Use them to circulate hot air in the wood shed to dry the firewood for next winter• Or use for solar cooling of unvented attic space