Geothermal

Question 1

What is geothermal water heating?

Answer 1

Uses earth heat to heat water

Geothermal water heating utilizes the natural heat stored in the earth.

Question 2

What is an CLOSED LOOP geothermal system?

Answer 2

Uses ground source heat pumps to transfer heat from ground to building

An CLOSED LOOP system involves a single stream of water in a closed hole.

Question 3

What is a OPEN LOOP geothermal system?

Answer 3

Uses clean water source in earth’s crust to heat water

A OPEN LOOP system has two streams: one for hot water abstraction and one for cold water injection.

Question 4

In a OPEN LOOP system, how many streams of water are used?

Answer 4

Two streams

One stream abstracts hot water while the other injects cold water.

Question 5

Fill in the blank: An CLOSED LOOP geothermal system involves a _______ of water in a closed hole.

Answer 5

single stream

Question 6

True or False: A CLOSED LOOP geothermal system uses a single stream of water.

Answer 6

True

OPEN LOOP systems operate with two separate streams of water.

Question 7

name 3 types of geothermal energy

Answer 7

1. high temperature - +150C - electricity generation
2. moderate temperature - 90-150C - space heating, industry processes.
3. low-temperature - under 90C - heating buildings

Question 8

what key attributes must be present in a good (geo)thermal heat source

5 points

Answer 8

1. high tempertaure source
2. presence of heat carrier (fluid)
3. permebility of rock
4. cap rock - traps the heat
5. geological stability - stable and accessible

Question 9

calculate heat flow for earths crust.
temperature of 58C @ 2km.
surface temp = 10C
thermal conductivity = 2.5 W/mC

Answer 9

q = Kt x ^T / ^z = Kt x G

ans = 0.06 W/M^2

given on formula

Question 10

geothermal

heat flow equation

(formula sheet)

Answer 10

q = K(t) * (change in temp / change in height)