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B T P

P C M

LUCELIA TARANTO RODRIGUESC G

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1. PRINCIPLES OF HEAT TRANSFER

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H T

T ,

I ,

I

I

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R

R

I ,

H, ()

C SN

E

A ,

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R, T A

,

A

F , ,

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F

E ():

A ():

R ():

T ():

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F L T

L

E .

A ()

R ()

T ()

1=++

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CI

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C

T ( ) ( )

T

T

A

P :

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CI

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C

I

T ( )

T

T

C ( )

O

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S H T M

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2. THERMOPHYSICAL PROPERTIES OF MATERIALS

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T P M

T , :

D (): (/3)

S (): (J/C)

T ():

(/C)

O T (C/)k

r 1=

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S Conductivity

(W/moC)Density(kg/m3)

Specific Heat(J/kgoC)

Steel 45 7800 480

PVC (regular) 0.16 1380 1000

Earth (common) 1.28 1460 880

Expanded polystyrene 0.035 23 1470

Cement (regular) 0.72 1860 840

Cement screed 1.4 2100 650

Plasterboard 0.17 800 1090

Heavyweight concrete 1.3 2000 840

Medium weight concrete block 0.86 1970 840

Lightweight concrete 0.2 620 840

Aerated brick 0.3 1000 840

Inner leaf brick 0.62 1800 840

Reinforced brick 1.1 1920 840

Outer leaf brick 0.96 2000 650

Ceramic tiles 1.20 2000 850

Softwood 0.17 550 1880

Hardwood 0.05 90 2810

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M:

T

/

M /

C

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C ?

( ?)

A ,

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?

I ,

A

I

T

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T E

T E () T I

D

I ,

A

H

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T E

T

I (.. ) (.. )

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3. CONDUCTION AND STORAGE OF HEAT

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Q H C

F'

R

x

Tkq

=

q = heat flux (W/m)

k = conductivity (W/mC)

T/x = temperature gradient (C/m)

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F L

L

TTkq 21

=

q = heat flux (W/m)

k = conductivity (W/m oC)

T1 = initial temperature (oC)

T2 = final temperature (oC)

L = thickness (m)

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C

RL

kU

1==

U= conductance (W/m oC)

R= resistance (m oC/W)

k= conductivity (W/m oC)

L= thickness (m)

T, ,

C

A T T

I R R

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C

RnRRU

+++=

...21

1

C U= conductance (W/m oC)

R= resistance (m oC/W)

332211

1

/kL/kLkLU

++=

13.0614.0

1

++=U

U= 0.16 W/m oC

R= 6.22 m oC/W

T N F/09 LTR

A M

T

T

Ahhh..!

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I

T S T M

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T S T M

I 4 :

H (.. )

H

H

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T M

H

H :

S :

S

:

A ()

(/ C)

T N F/09 LTR

T D F

T

D

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4. PHASE CHANGE MATERIAL (PCM)

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S H S L H

S

L

T

L

L

P C M (PCM)

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S H S L H

? B PCM!

A ;

,

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P C M:

T , ,

T

D

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P

S : (J/C)

S 25C 4.18 J/C

S 10C 2.05 J/C

S 100C 2.08 J/C

S :

(J/)

L 334 J/

L 2260 J/

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P

, , PCM

...

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D P PCM B

A

T

M/

H

H

S

C

/

H

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D P PCM BA

C

C /

N /

N

N,

K

H

H

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H ?

D : PCM

M: 1 ,

M: 1 ,

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M PCM

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M PCM

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T PCM B A

O : P F

C , ,

F,

I : S

H , ,

C ,

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A PCM

1. L

2. P

3. T

4. S PCM

5. PCM

6. PCM

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PCM B E

T PCM

,

S

I

PCM

PCM

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T E T MHEA EIGHT ALL:

OUT IN

Too

cold

Too

hot

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OUT IN

Too

cold

Too

hot

T E T MLIGHT EIGHT ALL:

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OUT IN

Toocold

Too

hot

T E T MLIGHT EIGHT ALL ITH PCM BOARD:

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PCM Q S I

P

I

PCM

PCM B

I

S

G PCM

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5. EXAMPLES

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BASF C C M PCM

K PCM S

3 M PCM 2

M/S :

23C 26C

H 110 J/

S 330J/ 2

..////.?C=1290798

M

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K PCM SB 23 E

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K PCM SB 23 E

S CO2 100

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DP E P

://../E/GB/.

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D ?

10

12

14

16

18

20

22

24

26

28

30

32

34

36

38

40

42

44

0.00

3.00

6.00

9.00

12.00

15.00

18.00

21.00

0.00

3.00

6.00

9.00

12.00

15.00

18.00

21.00

Time (minute)

Temperature(oC)

Ex te rn al Ai r T em p N o P CM Air Te mp P CM Air Te mp

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D D T A

T BASF H

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A + E

S N

H 0.15/2K

L D G

EA H E

S

H

C

P C M

T BASF H

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T PCM S S

D F I S E

T (ISE) F, E C

BASF

A

D

E

://..///..?=

T N F/09 LTR

QUESTIONS AND EXERCISE