Solar Energy - PowerPoint PPT Presentation

Loading...

PPT – Solar Energy PowerPoint presentation | free to download - id: 28b2c-NTZiM



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Solar Energy

Description:

Passive Solar Energy. Sensible architectural design. Use sun in the ... The wall is down and the passive collector is collecting solar energy. Passive Design ... – PowerPoint PPT presentation

Number of Views:41501
Avg rating:3.0/5.0
Slides: 50
Provided by: flox
Learn more at: http://www.trinity.edu
Category:
Tags: energy | solar

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Solar Energy


1
Solar Energy
  • Physics 1303

2
Three forms of solar energy.
  • Passive Solar
  • Active Solar
  • Photovoltaic

3
Passive Solar Energy
  • Sensible architectural design
  • Use sun in the winter
  • Avoid in the summer.
  • Cold climates- large glazing which may be
    insulated at night and opened during the day.
  • Hot climates - blocking the sun and providing
    good ventilation.  

4
Passive Design
  • Arizona Cliff Dwelling is an example of
    traditional low-tech solution to space heating
    and cooling needs.

5
Passive Design
  • This is a modern New Mexico version.
  • There is movable isolation to put in place at
    night.

6
Passive Design
  • Another interesting design.
  • The wall is down and the passive collector is
    collecting solar energy

7
Passive Design
  • In this mode, the wall is up and the building is
    storing solar energy or blocking summer heat gain.

8
An innovative passive design
  • Roof Pond House in Atascadero, California

9
Active Solar Energy
  • Use pumps and solar collectors to provide energy.
  • Two types of solar collectors
  • flat plate
  • concentrating

10
Flat Plate Collector
  • Made of a black absorbing plate with water
    running through it or air blowing past it.
  • Usually a flat plate collector has a glazing to
    stop heat from escaping.
  • Efficiency 50 or better.

11
Flat Plate CollectorHot Water Heater
  • Low cost heater in the roof of this modest Miami
    house

12
Flat Plate CollectorHot Water Heater
  • Low cost heater in the roof of this modest San
    Antonio house

13
Flat Plate CollectorHot Water Heater
  • Solar water heater system has four components
  • Collector
  • Tank
  • Pump
  • Controller

14
Flat Plate Collector
  • Flat Plate Collector components
  • Plate with tubing
  • Insulation
  • Glazing

15
Concentrating Collector
  • A concentrating collector includes some kind of
    lens or mirror.
  • Tracks the sun.
  • High temperature.
  •  Efficiency near 50.

16
Concentrating Collector
  • Components
  • Optics
  • Glazing
  • Absorber
  • Insulation
  • Tracking

17
Concentrating Collector
  • This one uses a mirror and has no glazing

18
Concentrating Collector
  • Used to be on the roof of the Bell center.

19
Concentrating Collector
  • This is the solar concentrating collector on the
    CPS Headquarters building on San Pedro.
  • It runs the air-conditioning system

20
Flat Plat Collector Problem
  • Lets work a problem

21
Solar Hot Water Heater
22
Flat Plate Collector Problem
A flat plate solar collector is used as a solar
hot water heater. The collector area equals 20
square meters. The collector is located in a
location with annual average daily solar
insolation equal to 5.0 kWh/square meter/day.
23
1.    Calculate the amount of solar energy
incident on this collector each day.  
  • Solar Energy
  • 5.0 kWh / sq m / day 20 sq m
  • 100 kWh / day

24
Assuming that the efficiency of the solar
collector and the rest of the system equals 50,
calculate the average daily energy produced (as
hot water) by this system. Express your answer
in kWh/day.
  • Average Produced Energy/day
  • 100 kWh / day 0.50
  • 50 kWh / day

25
3.  Calculate the amount of energy produced by
this system each year. Express your answer in
kWh.
  • Annual Energy Production
  • 50 kWh/day 365 day/year
  • 18,000 kWh / year

26
4. Assuming that the solar energy replaces the
heating of hot water by electric energy and that
electric energy cost 10/kWh, calculate the
yearly savings in electricity costs as a result
of using the solar hot water system. Express your
answer in /year.
  • Money Saved
  • 18,000 kWh 0.10/kWh
  • 1,800 / year

27
5. Suppose this solar hot water system were to
cost 5,400 (installed). Calculate the payback
period for this system
  • Payback Cost / Savings
  • 5,400 / 1,800 /year
  • 3 years

28
Photovoltaics
  • Photovoltaic systems convert solar energy
    directly into electricity. They have efficiencies
    near 10.

29
Photovoltaics
  • PV-powered airplane.
  • Is this really a good idea?

30
Photovoltaics
  • PV arrays are widely used for low power loads.

31
Photovoltacis
  • A PV array is made up of several panels and a
    panel is made up of several cells.

32
Photovoltaics
  • A complete system has an array, a battery, an
    inverter and a load.
  • The system can supply either DC or AC loads.

33
Photovoltaics
  • The inverter converts the DC voltage from the PV
    array into an AC signal to power AC loads or to
    connect to the grid.

34
Photovoltaics
  • Laurel Kaesler and Frank Ehman designed and built
    the PV Project in the Physics Department

35
Photovoltaics
  • The PV project has 4 components
  • Array
  • Controller
  • Battery
  • Load

36
Photovoltaic
  • Controller

37
Photovoltaics
  • The load is a pair of fluorescent lights that I
    use in a small 3rd floor lab in MMS

38
Photovoltaic
  • This is the solar array on the CPS Headquarters
    building on San Pedro.

39
Photovoltaic
  • The output of the array is inverted into an AC
    voltage and fed back to the grid.

40
Photovoltaics
  • A high-tech solution is to use PV to capture
    sunlight as electricity and use the electricity
    to produce microwaves that are beamed back to
    earth.

41
PV Problem
  • Lets work a PV problem.

42
Photovoltaic Power System
43
PV Problem
A photovoltaic power system has a collector area
equals 100 square meters. The collector is
located in a location with annual average daily
solar irradiance (insolation) equal to 5.0
kWh/square meter/day.
44
1.    Calculate the amount of solar energy
incident on this collector each day.  
  • Solar Energy
  • 5.0 kWh / sq m / day 100 sq m
  • 500 kWh / day

45
Assuming that the efficiency of the PV array and
the rest of the system equals 10, calculate the
average daily energy produced (as electricity) by
this system. Express your answer in kWh/day.
  • Average Produced Energy/day
  • 500 kWh / day 0.10
  • 50 kWh / day

46
3.  Calculate the amount of energy produced by
this PV system each year. Express your answer in
kWh.
  • Annual Energy Production
  • 50 kWh/day 365 day/year
  • 18,000 kWh / year

47
4. Assuming that the cost of electric energy
equals 10/kWh, calculate the value of the
electricity produced by this system annually.
  • Value of energy or Savings
  • 18,000 kWh 0.10/kWh
  • 1,800 / year

48
5. Suppose this PV system were to cost 27,000
(installed). Calculate the payback period for
this system.
  • Payback Cost / Savings
  • 27,000 / 1,800 /year
  • 15 years

49
Solar Energy
  • Do you think solar energy will able to replace a
    significant fraction of the energy needs of our
    society?
About PowerShow.com