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APPARATUS

• SOLTEQ Bench Top Cooling Tower Unit (Model: HE152)

1 Ori!ice

2 "#ter $i%tri&'tor 

#c*ing Col'+n

, -low Meter 

5 .ecei/er T#n* 

0 ir Blower 

M#*e3'p T#n* 

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4 $i!!erenti#l re%%'re Tr#n%+itter 

Lo#d T#n* 

16 Control #nel

PROCEDURE

1 7#l/e% 71 to 70 were chec*ed #nd en%'red to &e clo%ed #nd /#l/e to &e p#rti#ll8

opened

2 The lo#d t#n* w#% !illed with deioni%ed w#ter -ir%tl89 the +#*e3'p t#n* w#% re+o/ed #nd

deioni%ed w#ter w#% po'red thro'gh the opening #t the top o! the lo#d t#n* The +#*e3'p

t#n* w#% repl#ced onto the lo#d t#n* #nd the n't% were lightl8 tightened Then9 the t#n*

w#% !illed with deioni%ed w#ter 'p to the ero +#r* n the %c#le

$eioni%ed w#ter w#% #dded to the wet &'l& %en%or re%er/oir to the !'lle%t

, ll #ppropri#te t'&ing w#% connected to the di!!erenti#l pre%%'re %en%or

5 The #ppropri#te cooling tower p#c*ing w#% in%t#lled !or the e;peri+ent0 Te+per#t're %et point o! te+per#t're controller w#% %et to Error: .e!erence %o'rce not

!o'nd The 16*" w#ter he#ter w#% %witched on #nd w#ter w#% he#ted 'p 'ntil

#ppro;i+#tel8Error: .e!erence %o'rce not !o'nd

The p'+p w#% %witched on #nd the control /#l/e 71 w#% %lowl8 opened #nd the w#ter

!low r#te w#% %et to 26LM

4 The d#+per w#% !'ll8 opened #nd the !#n w#% %witched on

Blower %witch w#% %witched on #!ter the w#ter #lre#d8 went thro'gh the cooling tower

16 The 'nit w#% r'n !or 26 +in'te% to en%'re !lo#t /#l/e correctl8 #d

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Col'+n: C

"#ter -low .#te: 2LM

Blower: -'ll8 Opened

He#ter (*") 65 16 15

ir inlet dr8 &'l&

T1 (6 C )

14 1, 1

ir inlet wet &'l&

T2 (6 C )

20 20 20

ir o'tlet dr8 &'l&

T (6 C )

24 244 65

ir o'tlet wet &'l&

T, (6

 C )

26 2 15

"#ter inlet te+per#t're T5

(6 C )

1 ,

"#ter o'tlet te+per#t're

T0 (6 C )

22 24 240

He#ter ower (") ,26 46 1214

$ p Ori!ice (#) 00 0 04

$ p Col'+n (#) 6 4 0

Col'+n: C

"#ter -low .#te: 2LM

Blower: H#l! Opened

He#ter (*") 65 16 15

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Graph 1

B#%ed on gr#ph 19 it c#n &e %een th#t #% the power he#ter incre#%ed the pre%%'re di!!erence on

ori!ice #l%o incre#%ed Howe/er9 the di!!erence i% onl8 &8 one which c#n &e con%idered %+#ll

-ro+ thi% gr#ph9 the rel#tion%hip &etween the he#ter #nd pre%%'re di!!erence i% directl8

 proportion#l to e#ch other

Graph 2

B#%ed on gr#ph 29 it c#n &e %een th#t #% the power he#ter incre#%ed the pre%%'re di!!erence on

col'+n #l%o incre#%ed The di!!erence i% &8 tenth which i% con%idered #% &ig #ddition on the /#l'e

$p o! col'+n -ro+ thi% gr#ph9 the rel#tion%hip &etween the he#ter #nd pre%%'re di!!erence i%

6565.566...

00.511.5

 Heater kW

02000.511.5 Heater kW

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directl8 proportion#l to e#ch other Other th#n th#t9 it #l%o %how% th#t the e!!ect o! he#ter #re

gre#ter tow#rd col'+n th#t the ori!ice

II. Graph of half opened Blower

Graph 3

B#%ed on gr#ph 9 it c#n &e %een th#t #% the power he#ter incre#%ed the pre%%'re di!!erence on

ori!ice #l%o incre#%ed The di!!erence &etween $p i% &8 two which i% &igger th#n the $p o! ori!ice

!ro+ gr#ph 1 -ro+ thi% gr#ph9 the rel#tion%hip &etween the he#ter #nd pre%%'re di!!erence i%

directl8 proportion#l to e#ch other >t #l%o %how% th#t the opening o! &lower #l%o #!!ecting the

incre#%e in $p o! ori!ice

58596000.511.5

 Heater kW

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Graph 4

B#%ed on gr#ph ,9 it c#n &e %een th#t #% the power he#ter incre#%ed the pre%%'re di!!erence on

col'+n #l%o incre#%ed The di!!erence &etween $p i% &8 !i/e which i% %+#ller th#n the $p o!

col'+n !ro+ gr#ph 2 -ro+ thi% gr#ph9 the rel#tion%hip &etween the he#ter #nd pre%%'re

di!!erence i% directl8 proportion#l to e#ch other >t #l%o %how% th#t the opening o! &lower #l%o

#!!ecting the incre#%e in $p o! col'+n Other th#n th#t9 it #l%o %how% th#t the e!!ect o! he#ter #re

gre#ter tow#rd col'+n th#t the ori!ice

CALCULATION

 Sample calculation

Blower $#+per 

"#ter -low r#te ? 2LM

He#ting Lo#d ? 65

Blower !'ll8 opened ? 166@

Range of ool!ng "ower#

606500.511.5

 Heater kW

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approachrange

range

+

(65,

5,

+

.#nge ? "#ter inlet te+per#t're9 T5 3 "#ter o'tlet te+per#t're9 T0 

? 1 6 C 3 22 6 C

? ,5 6 C

Approah of ool!ng "ower#

ppro#ch ? "#ter o'tlet te+per#t're9 T0 3 ir inlet wet &'l&9 T2 

? 22 6 C 3 20 6 C

 ? 6 6 C

Eff!!eny of ool!ng "ower#

A ? 166@

? 166@

? 5@

To"al ool!ng load#

Cooling lo#d ? he#ter power (") he#ting lo#d (*")

 

? ,26 " ( 65 *" )

  ? 26 "

A!r $a%% flow ra"e per un!" area#

 (*gD%) ?ṁ

-ro+ p%8cho+etric ch#rt ( -elder

.o'%%e#'9 26659 p 45)F

ir inlet wet &'l&9 T2 G Tw& ? 206C

kW 

W 

1

1666

   

  • 

  

  

     

kg mV m A

 smV 

D2

D

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>nterpol#tion:

Tw& (6C) 7 (+D*g)

2666 645

20 7

660 66

7 ? 644, +D*g

 ?ṁ

 

? 104, 16

3

 *gD+

2

%

&a"er $a%% flow ra"e per un!" area#

 (*g o! w#terD+ṁ 2%) ?

-ro+ p%8cho+etric ch#rt ( -elder .o'%%e#'9 26659 p 45)F

ir inlet wet &'l&9 T2 G Tw& ? 206C

>nterpol#tion:

Tw& (6C) h (*g w#terD*g #ir)

45666

456

626606

62620

−−

=−−   V 

   

     

   kg mm

 L

m

 s

 L

D(

44,62

62256

1666

(1

06

+in1

+in62

( )air kg water kg h

 sair of kg m

9D9

2+D99      

  

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2666 66240

20 h

660 661,4

h ? 6611 *g w#terD*g #ir 

 ?ṁ

  ? 66446 *gD+2%

&a"er $a%% flow ra"e "o a!r $a%% flow ra"e ra"!o#

r ?

r ?

r ? 5220

!or the other /#l'e9

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Eff!!eny of ool!ng

"ower0 1

5 455 42

To"al ool!ng load

+&-

26 146 214

A!r $a%% flow ra"e

per un!" area

+g2$3%-

104, 163 104 163 1041 163

&a"er $a%% flow ra"e

per un!" area

+g2$3

%-

66446 66405 664,2

&a"er $a%% flow ra"e

"o a!r $a%% flow ra"e

ra"!o0 r

5220 5152 5612

A!r flow ' /)* +,lower half opened-

Power +&- )./ (.) (./

Range +)C- , 00 ,

Approah of ool!ng

"ower +)C-

62 12 2

Eff!!eny of ool!ng

"ower0 1

52, 10 42,0

To"al ool!ng load

+&-

25 1464 2,2

A!r $a%% flow ra"e

per un!" area

+g2$3%-

104, 163 10 163 104 163

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&a"er $a%% flow ra"e

per un!" area

+g2$3%-

66446 6645 66454

&a"er $a%% flow ra"e"o a!r $a%% flow ra"e

ra"!o0 r

5220 5646 5110

P %yho$e"r! har"

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