RES

Question 1

5 types of resources

Answer 1

Sun, wind, tide, water, geothermal

Question 2

What is the most reliable res?

Answer 2

geothermal

Question 3

2 type of turbines and the differences?

Answer 3

-horizontal: more efficient, larger, yaw system, generate at 690V step up after
-vertical: less efficient, smaller, wind can come any direction

Question 4

What is MPP?

Answer 4

maximum power point, adjusts blade angle to wind speed

Question 5

Double fed induction generator converts what to what and what is it similar to?

Answer 5

AC to DC to AC, similar to wound rotor motor

Question 6

What is yaw turns?

Answer 6

maximum amount of turns in one direction

Question 7

What factors need to be taken when there is an obstruxtion for a turbine?

Answer 7

2x higher then obstruction and 20x further

Question 8

3 types of geothermal energy? Explain.

Answer 8

-dry steam: no liguid, high temp dry steam
-flash steam: high pressure hot water and steam
-Binary cycle: lower temp 85-100 C refigerant, most versatile

Question 9

What is geothermal potential?

Answer 9

10-15 meter depth that remains at 10-15 C

Question 10

What is sensible heat?

Answer 10

amount of heat you can add or release to change temp

Question 11

What is latent heat?

Answer 11

amount of heat required for a substance to change state of matter

Question 12

What is latent heat fusion?

Answer 12

change state from solid to liquid

Question 13

What does a condensor do?

Answer 13

releases heat to surrounding environment, high pressure

Question 14

What does an evaporator do?

Answer 14

absorbs heat from the surrounding environment, low pressure

Question 15

In cooling mode what is located underground?

Answer 15

Condensor

Question 16

In heating mode what is located underground?

Answer 16

Evaporator

Question 17

3 underground installations explain?

Answer 17

-horizontal: 10-15ft deep, cheaper, requires large land
-vertical: 100-200 ft deep, not a lot of space required, expensive to drill vertical bore holes

Question 18

Micro inverter converts what? and how efficient are they?

Answer 18

DC to AC and 90% efficient

Question 19

What is an array?

Answer 19

whole PV panel system

Question 20

What does a stand alone system require?

Answer 20

large battery sized accordingingly to run everything for 3-5 days

Question 21

What does a hybrid system require?

Answer 21

More then 1 source of energy such as backup generator and PV

Question 22

2 types of grid connected systems? Explain.

Answer 22

-Utility interface-:solar stored in battery, when batter is low switches to grid
-Utility interactive: no battery storage, excess energy fed back to grid

Question 23

What is anti islanding?

Answer 23

type of inverter that stops supply of energy to grid during power outage

Question 24

What reading is rpesent when you short 2 leads on pv panel?

Answer 24

max current

Question 25

What reading is present when 2 leads are open on PV panel?

Answer 25

max voltage

Question 26

On a PV panel what happens to current/voltage when temperature increases?

Answer 26

current increases, voltage decreases

Question 27

Where ar alkaline fuel cells used?

Answer 27

Spacecraft

Question 28

Benefits of electrolysis?

Answer 28

Green, environmentally friendly

Question 29

What is steam method reforming?

Answer 29

heats methane to produce hydrogen

Question 30

Thermal decomposition of water?

Answer 30

decompose water into hydrogen and oxygen requires high temp

Question 31

Advantages of hydrokinetic?

Answer 31

-more predicatble and reliable then wind power -no retaining structure discreet

Question 32

3 different types of hydrokintetic?

Answer 32

vertical, horizontal, oscillating foil

Question 33

How does an oscillating turbine work?

Answer 33

water rises/falls with tides changing air pressure

Question 34

What is the formula you need to know the P one?

Answer 34

P= 1/2(pxAxv^3) is p drops by 20% and v^3 goes up byt 20% total power will go up