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Solar Thermal Presentation Plumbers

In this presentation we explore what solar energy is and how we can use it to generate hot water.

Gabriel Cantor

on 2 February 2011

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Transcript of Solar Thermal Presentation Plumbers

Solar Hot Water How Can We Use Solar Energy? Solar vs. Convention Solar Water Heaters
Uses free energy
You can't turn the sun on or off
Requires more storage
Is excellent for pre-heating Electric or Gas Water Heaters
Uses expensive energy
Can be turned on or off at will
Less storage is required
Is an excellent backup to solar What is solar energy?
Motion of the Sun
How can we use it?
Solar Hot Water Systems
Solar Hot Water Components
Design Guidelines Hydrogen becomes helium + energy
Energy leaves the sun in every direction in the form of light
Light particles photons shoot off into space and travel until they hit something
When a photon hits something it will bounce off or be absorbed. Solar Energy is mostly visible light that travels
93 million miles to reach the earth.
The journey takes 8 minutes. When light hits a dark surface, the light is absorbed and the surface heats up. What is Solar Energy? Nuclear Reaction The Sun (Gigantic Nuclear Furnace) Earth Solar Energy Motion of the Sun Breakfast Low in the winter
High in the summer Review:
Sunlight + Black Surface = Hot

Hot + Water = Hot Water Sunlight + Black Surface = Hot
Hot + Egg = Breakfast Tubes for fluid to flow through Metal fin with dark, light-absorbing coating Insulation to reduce heat loss Glass Cover, to reduce heat loss As fluid flows through the collector, the fluid heats up Let's add a few components and make a system
Tank, to store the energy because you can't turn the sun on or off
A pump, to move the fluid through the collectors
A controller, to turn the pump on and off.
A source of back up energy, for cloudy days. OK, if you live where it NEVER freezes, and water quality is excellent. Direct, Active System COLLECTOR Differential Controller
Turns on when the collectors are warmer than the tank
Turns off when the collectors are cooler than the tank Indirect, Active System
Glycol, 1 Tank Uses propylene glycol antifreeze to protect the collectors from freezing and from poor water quality.
A heat exchanger coil in the tank transfers heat from the glycol to the water. We can use two separate tanks if more storage is required. Indirect, Active System
Glycol, 2 Tanks Indirect, Active System
Drainback, 1 Tank Gabriel Cantor Solar Thermal Engineer Design Guidelines: Tilt & Orientation
Facing within 45 deg of South
Tilted between 15 and 60 deg.
Each person uses approx. 20 gal/day.
Each collector produces approx. 30 gal/day in the summer.
Each collector requires approx. 35 gal of storage capacity.
Refer to the chart. Unglazed Evacuated Tube Other Collector Types Shading Data logging
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