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Learner tasks with info mapping. writing from maps. summarizing. mapping text. controlling navigation. Learner tasks with info mapping. writing from maps. summarizing. mapping text. controlling navigation. Learner tasks with info mapping. writing from maps. summarizing.

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Presentation Transcript
slide1

Learner tasks

with info mapping

writing

from

maps

summarizing

mapping

text

controlling

navigation

slide2

Learner tasks

with info mapping

writing

from

maps

summarizing

mapping

text

controlling

navigation

slide3

Learner tasks

with info mapping

writing

from

maps

summarizing

mapping

text

controlling

navigation

in mapping tasks,

limit the number

of nodes

this forces learners

to identify

main structures

slide4

Ocean thermal energy could be the wave of the future

Noriyuki YoshidaThe Daily Yomiuri 01 01 23

_____________________________________________________________________________

_____________________________________________________________________________

The experiment uses technology developed by Prof. Haruo Uehara and researchers at the science and engineering department of Saga University. It is hoped that the test will produce 1,000 kilowatts of electricity, and it is expected that the technology will provide cost-efficient, environmentally friendly energy in the 21st century.

_____________________________________________________________________________

_____________________________________________________________________________

Thermal and nuclear power plants boil water into steam, which rotates turbines to generate electricity. The basic mechanism of the OTEC is the same, but instead of water, the OTEC process uses ammonia, which is more energy efficient because it evaporates at a much lower temperature than water.

_____________________________________________________________________________

_____________________________________________________________________________

First, liquid ammonia is heated with water of 20 C to 30 C drawn from near the surface of the Indian Ocean and converted into steam. Then the ammonia steam rotates turbines and generates electricity. Finally the steam is cooled with 6 C deep-sea water and converted back to liquid.

_____________________________________________________________________________

_____________________________________________________________________________

In thermal power generators, the temperature difference between water and steam is about 500 C, which means the steam is packed with energy. But the temperature difference in the OTEC system is only about 20 C, so the energy from the ammonia steam is relatively low. To overcome this, OTEC utilizes a process developed by Uehara to improve the heating and cooling of the ammonia and use water as a solvent.

_____________________________________________________________________________

_____________________________________________________________________________

The OTEC system's heat efficiency rate (the percentage of generated power compared to the total energy poured into the system) has reached a high of 5.2 percent under the Uehara Cycle. This is much lower than 40-percent level in thermal power generation and the 50 to 60 percent efficiency of power generation using a combination of thermal systems and gas.

_____________________________________________________________________________

_____________________________________________________________________________

Uehara said, "Because the source of heat is seawater, the energy cost is zero. The overall costs of the power generation processes are not much higher than those of thermal generation and other forms," he said.

e.g.

Take a tech article,

remove topic and conclusion sentences

from each paragraph,

have learners map the article

with 15 nodes or fewer.

slide5

Use the infomap links to map the text.

<

big

Classification

Description

Degree

comparison

Attribute

comparison

Contrast

!

Sequence

Cause-effect

slide6

Steam-based power generating systems

General

process:

Boil a

liquid

Make

steam

Rotate

turbines

Generate

electricity

seawater

heat

fossil or

N-heat

boil

NH3

boil

H2O

!

OTEC

plants

older type

plants

!

steam

20C

steam

500C

!

low

power

high

power

zero

energy cost

high

energy cost

hunter systems

slide7

Steam-based power generating systems

General

process:

Boil a

liquid

Make

steam

Rotate

turbines

Generate

electricity

seawater

heat

fossil or

N-heat

boil

NH3

boil

H2O

!

OTEC

plants

older type

plants

!

steam

20C

steam

500C

!

low

power

high

power

zero

energy cost

high

energy cost

hunter systems

slide8

Steam-based power generating systems

General

process:

Boil a

liquid

Make

steam

Rotate

turbines

Generate

electricity

hunter systems

slide9

Steam-based power generating systems

Steam

plants

OTEC

plants

older type

plants

zero

energy cost

high

energy cost

boil

NH3

low

power

high

power

boil

H2O

seawater

heat

steam

20C

fossil or

N-heat

steam

500C

slide10

Steam-based power generating systems

Steam

plants

OTEC

plants

older type

plants

zero

energy cost

high

energy cost

boil

NH3

low

power

high

power

boil

H2O

fossil or

N-heat

seawater

heat

steam

20C

steam

500C