Renewable Energy Workshop CDAE-106 Intro Gary Flomenhoft gflomenh/CDAE106

Renewable Energy WorkshopCDAE-106Intro

Gary Flomenhofthttp://www.uvm.edu/~gflomenh/CDAE106/

Peak Oil

CLIMATE CHANGE

WORLD

ENERGY

Fossil Fuel: 75.9%

Nuclear: 5.7%

Renewable: 18.4%

Net Energy

DIRECT-GAIN

• Large south facing windows that let in the sunlight.

• Thermal mass is used to absorb the radiation.

• At night the absorbed heat is radiated back into the living space.

CDAE 170 Solar Building StrategiesPV system design Dec. 1, 2003

Gary FlomenhoftBSME, MAPP, CEEResearch AssociateGund Institute, SNR

Collectors-Flat Plate

Collectors-Evacuated tube

Installation

Offgrid-24V Inverter-batteries-generator

Photoelectric Effect

A picture of an typical silicon PV cell

Now a short video:

http://www.eere.energy.gov/solar/multimedia.html

CZOCHRALSKI PROCESS

• This is the process of creating an ingot.

• A small single silicon rod (seed) is placed in an inert gas at high temps.

• When the seed is rotated up and out silicon adheres to it to form an ingot.

EVERGREEN-STRING RIBBON

NONOSOLAR: paint-on

CELLS -> MODULES

• Wafers 5 inches square and .012 inches thick are sliced from the ingot.

• They are then processed into cells and soldered together to achieve the desired voltage.

• Cells arrayed in series are called modules.

MANUFACTURERS

• Sharp Electronics Corporation

• Sanyo• bp Solar• Shell• Sunwise• Uni-Solar• AstroPower

POLYCRYSTALLINE SOLAR PANELS

“Energy of the Future”

Thin Film History

• Developed in 1980

• Applied to calculators, watches and other portable low-watt appliances

• Expanded to larger appliances as efficiency rate increased

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Cost by Brand

• Unisolar 21 watt= $153.00

• Shell 20 watt= $198.00

• Isofoton 165 watt= $650.00

-research shows that on average thin cell costs $5 per watt

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Solar Charge Controllers

Alison Ray and Scott Hamshaw

Solar Trackers

Getting the most out of your PV panels

What is an Inverter?

• An inverter is an electrical circuit capable of turning DC power into AC power, while at the same time regulating the voltage, current, and frequency of the signal

Batteries?

Micro-Hydro site

• 15 kw of power• Servicing 25 homes• $30,000

Turbines: Reaction or Impulse

Turbines: Reaction or Impulse

Impulse-type Turbine

• High-head use-• (Vertical drop > 10m)

• High pressure (PSI)

Harris DC Hydro systems

Inside of Micro Turbine

• 4 inch diameter impulse turbine

• Creates 200 watts of power

• Cost $1440

Impulse Turbines

Pelton: High head (>10ft), low flow

Turgo: Medium head (>4ft)

Crossflow: Low head, high flow

Stream engine top

Stream engine bottom

Impulse machines-Stream engine -$1895

PF-175

PF-175-$950 (plus shipping from India)

14KW Canyon Industries Pelton

Reaction-type Turbine

• Low-head situations (high flow/ low PSI)

Reaction-type Turbine-Propellor

• Low-head situations (high flow/ low PSI)

REACTION TURBINES

Francis Kaplan or propellor

Reaction machine installation

LH (Low head)-1000 reaction machine-$1895

Reaction-type Turbine-Kaplan

• Low-head situations (high flow/ low PSI)

Wind Turbines

Biomass: In VermontVT Energy Consumption Sources• Nuclear 36%• System 14%• Hydro Quebec 35%• Oil 2%• Gas 1%• Other Renewable 5%• Small Hydro 7% Since 1984, Vermont has met all increase

in energy demands(a total of 125 Mw) by renewable in-state sources:

-40 Mw Small Hydro

-73 Mw McNeil/Rygate (Biomass Plants)

-6 Mw Searsburg Wind Farm

EPA Landfill Incentive Programhttp://www.epa.gov/lmop/

Kinds of Biomass-traditional

• Trees- Wood has been used as a source of energy throughout human history and today the most commonly used form or biomass. Today there are still many people in third world countries using it to provide heat and energy. There are also ‘purpose grown’ tree farms which are specifically grown to produce wood for energy in larger developed countries.

More traditional Biomass types

• Straw is used similarly too wood, it is burned and used to make heat and energy

• Animal Dung- Poop is often used as a source of heat and energy

More non-traditional Biomass

• Landfill gas- The gas emitted from landfills is very rich in methane, it is collected and used to generate power in small scale power plants.

Gasohol• Ethanol Alcohol

generated by fermenting sugar cane or corn is combined with gas and used to power cars…mmm…tasty gasohol.

BiodieselBiodiesel is made from:• vegetable oil• alcohol (20-30%)• sodium/potassium

hydroxide (2-3%)

Geothermal Heat Pumps• A geothermal heat pump system consists of

pipes buried in the shallow ground near the building, a heat exchanger, and ductwork into the building. In winter, heat from the relatively warmer ground goes through the heat exchanger into the house.

• In summer, hot air from the house is pulled through the heat exchanger into the relatively cooler ground. Heat removed during the summer can be used as no-cost energy to heat water.

Seasonal GHP’s

Geysers

• Water at bottom of container is under great pressure and will not boil until temperature is above 100oC

• When boiling begins, a great amount of pressure is released, causing the water to boil rapidly.

• Steam-driven water, under great pressure, rushes up to the neck, and sprays steam into the air