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[Pages:15] 18 18-20 2547

Energy Saving for Chiller by Using Automatic Ball Cleaning System

10330 0-22186610 0-22522889 E-mail: fmewyc@eng.chula.ac.th Withaya Yongchareon Jirasak Mekumpornpong

Department of Mechanical Engineering, Faculty of Engineering, Chulalongkorn University Prayathai Rd, Pratumwan Bangkok 10330 Thailand

Tel: 0-22186610 Fax: 0-22522889 E-mail: fmewyc@eng.chula.ac.th

30% 1 2 3 55 1 8-10 4 4 8.1 % 6.8 2.2 1.8 150 500 900

Abstract In highrise buildings the Airconditioner is a water chiller.When the

scale is deposited on the wall of condenser tube, the chiller efficiency is decreased and thus it consumes more energy. The purpose of this research is to study the performance of the automatic tube cleaning machine using Ball Technic for chillers.Also the energy saving and budgeting is also analyzed and compared between using ball cleaning technic and conventional brush cleaning technic.In ball cleaning technic ,balls are injected at hourly interval into condenser pipe and passed through the condenser tubes.As the balls pass through the tubes they wipe off all scale, thereby keeping the condenser free from scale all time. The amount of ball used is 30%of the number of condenser tubes that the water flow in.The cycle time consists of ball injecting time 2 minutes, ball collecting time 3 minutes, and dwelling time 55 minutes. The automatic tube cleaning machine usually works 8-10 cycles for a day.

Temperatures ,pressures, flowrates ,and the electric energy of chiller were measured during the period of 4 months for both before and after the installation of an automatic tube cleaning machine. Cooling load ,chiller efficiency, and approach temperature are calculated. From the analysis, the approach temperature is used as an fouling index.The energy saving is 8.1 % and the pay back period are 6.8 ,2.2, and 1.8 years for cooling load 150, 500, and 900 refrigeration ton respectively.

23% 68% .. 2535 1500 3000 0.7 kw/Ton 500 Ton 350 kw 1 5-20% ?

(1)

4 4 8:00 18:00 / / /

(2)

1. , q (kw)

q

=

o

m

C P

(TE1 - TE2 )/1000

2. , EER

EER = q/p = f (TE1 ,TC1 , t , n , Parameters)

p/q = Kw/Ton 3. , E (kw-hr)

t

E = pdt

o

4.

,

Top

Top =

-

o

m

=

,Kg/s

TE1 = , oC TTE2 = , oC TC1 = , oC Cp = , KJ/Kg-oC

P = , Kw

t = ,

n =

(3) 2 (Ball Collector) (Ball Strainer) (Check Valve ) C1C2 (Motorized Valve)S1,S2,D1,D2 S2 D2 S1 D1 S1 D1 C1 2 S1 D1 S2 D2 C2 S2 D2 30%

 4 1 8-10

TAC CI TEXMAC (THAILAND) CO.,Ltd. TAC 1.5 kw 16 . (Programable Logic Controller) 2 3 1 1 . 40

.

,PH , mS

(mg/L CaCO3) (mg/L SO4)

2546 8.9

3.71

120

275

2546 9

3.41

418

250

2546 2547 8.6 7.92

0.804 1.588

130 5o

117 -

1 120-418

1

1

.

2546 2546

7.3

7.28

,PH

, mS 0.285 0.239

2546 7.41

0.178

2547 7.88

0.313

80

64

Nil Nil

(mg/L CaCO3)

(mg/L SO4)

55

36

27 -

.

2 1.00 1.08 0.2 1.9

2

Date/ Time M/D/Y 6/17/2003 7/8/2003 8/3/2003 8/21/2003 9/25/2003 10/9/2003 Mean

Capacity Ton 142 143 138 137 133 133 138

Power Efficiency Approach

Kw Kw/Ton

oC

142.2 1.00 0.2

139.7 0.98 0.6

136.2 0.99 0.9

138.0 1.01 1.3

142.0 1.07 1.9

143.4 1.08 1.9

140

1.02 1.1

 3 1 10 1395 1408 0.99 0.015

3

Month Energy Consumption KwHr

June

1407

July

1410

August 1389

August 1376

September 1395

October 1395

Mean

1395

Cooling Energy

TonHr 1405 1642 1394 1359 1331 1319 1408

Efficiency

Kw/Ton 1.00 0.86 1.00 1.01 1.05 1.06 0.99

. 4 1.0

0.97 5 1 10 1488 1591 0.94

3 (1) 1 1 150 (2) 1

1 500 (3) 1 3 300 4

Date Capacity

M/D/Y Ton

12/11/2003 142

1/20/2004 147

2/14/2004 148

3/10/2004 153

Mean

148

Power Kw 148.0 148.4 152.9 148.5 150

Efficiency Approach

Kw/Ton oC

1.05

0.5

1.01

0.4

1.03

0.5

0.97

0.9

1.01

0.6

5

Month Energy

Cooling

Consumption Energy

KwHr

TonHr

December 1486

1678

January 1486

1678

February 1492

1475

March 1487

1532

Mean 1488

1591

Efficiency

Kw/Ton 0.89 0.89 1.01 0.97 0.94

3 (Net Present Value:NPV) (Pay Back Period: PBP) (Internal Rate of Return: IRR)

NPV = Ao ? As[(1+i)n-1]/i(1+i)n

Ao = As = i = n =

?

1. 15

2.

1

3.

4.

7.5 %

5.

1 %

6.

3

7.

0.94 ( 5)

8.

0.015

9. 5 10 2600

1 1 1

150

150

0.94

1 1.03

425100

390000

477 /

34623 8.1%

577800

20/*40/*3/ 2400

103870

1 10000

NPV 1042042

PBP

6.8

IRR 18.5 %

3

6 1

3 300

NPV 6079217 PBP 1.6 IRR 70%

6 3

NPV

PBP

IRR

%

150 500 900 577800 687800 942000 2400 3750 7200 104325 350025 628875 10000 15000 30000

1042042 6.8 18.5

3373010 6079217 2.2 1.6 53.4 70.0

 8.1 % 6.8 2.2 1.8 150, 500 900

CI TEXMAC (THAILAND)

2547

1

Strainer

CT

Collector C2

D2

C1

D1

Condenser

Comp.

Evaporator

2

S2 S1

Clean Collect

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