chiller system by Mr.Seng Sunhor

MINISTER OF EDUCATION YOUTH AND SPORT

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INSTITUTE OF TECHNOLOGY OF CAMBODIA

INDUSTRIAL AND MECHANICAL ENGINEERING

THESIS

Title :Water Cooled Chiller System Selection

Student : Mr. SENG Sunhor Major : Industrial and Mechanical EngineeringAdviser : Mr. UN AmataAcademic year: 2015 – 2016

Outline

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I. Introduction of Comin Khmere

II. Water Cooled Chiller System

IV. Conclusion

III. Calculation and Selection

I. Introduction

1. Comin Khmer Co. Ltd.,

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The first MEP Company

Mechanical Electrical Plumbing

Figure2.1. Comin Khmere

Address: No 8b, Down Town Road, Phnom Penh,

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II. Water Cooled Chiller System

1. Introduction of water cooled chiller system

2. Equipment of Water Cooled Chiller System

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1. Introduction of water cooled chiller system

A kind of Air-conditioning system It was installed by combined many

components• Chiller• Pump: Condenser water pump &

: Chilled water pump • Cooling Tower

• Expansion Tank

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AHU/PHU FCU

Used for indoor unit

Figure 2.2. Fain coil unitFigure 2.1. Air handing unit

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• Condenser

• Compressor

• Evaporator

Components of Chiller


Figure 2.3. Fain coil unit

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Cooling Tower Pump

Figure 2.4.Pump Figure 2.5.Cooling Tower

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III. Calculation and Selection

1. Building Load Calculation

2. Cooling Tower

4. Make-Up Tank

3. Pump (CHWP & CDWP)

2. Chiller

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ACLEDA DATA CENTER BUIDING

It has many kind of rooms

• There are six level; GF, 1F to 4F and Terrace Floor.

• Data center room• Office• UPS room• Meeting room

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Hourly Analysis Program (HAP)


Figure 3.1. Hourly Analysis Program

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FCU Selection from the Catalogs

• Total load in building = 2299kW

Calculation by HAP

• Total Load = 2357 kW Chiller selection

No Description Cooling Chiller Qty Duty StandbyLoad(kW) kW Total

1 Total load 2357 843.9 4 3 1

Table 3.1. Number of chiller; duty & standby

13Figure.3.2 Chiller Catalog

Cooling Capacity

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2. Cooling Tower

Net Heat Calculation ; ( kW) Water flow rate ; (kg/s or L/s) Inlet and out let temperature in CT

W input=QH−QL=Q c𝑑−QevaSecond law of Thermodynamic

(eq.1)

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Cooling Coefficient of Performance (COPR)

(eq.2)

• =843.9 kW; Cooling Capacity

• : Power input (kW)

5; in water cooled chiller system

2. Cooling Tower

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(eq.3)

Water flow rate: ; =4.179 kJ/kg.K

=174.6

(eq.1); =>

Q cd=1012.68𝑘𝑊

2. Cooling Tower

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No Description Qcd EWT LWT

kW

1 CT-01 1012.68 37 32 174.6

2 CT-01 1012.68 37 32 174.6

3 CT-01 1012.68 37 32 174.6

4 CT-01 1012.68 37 32 174.6

Table 3.1. Cooling selection

Data for selection cooling tower

2. Cooling Tower

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Cooling tower catalog

Fig 3.3. Cooling tower Catalog

Flow rate 197.9

2230E

2. Cooling Tower

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2230E

Fig 3.4. Cooling tower Catalog

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Flow rateand Pressure drop;

;

Q eva=mw c p∆T CH ;∆T CH=T CH (en )−T CH (out ); eq .4

mw=Q eva

c p(T ¿¿CH (en)−T CH (out ))=843.9

4.179×5¿

mw=40.4 l /s

3. Chiller Water Pump

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=[2L(m)100% 400 (kPa/m)+FCU(kPa) +Chiller(kPa)] eq.5

Estimation method

]

=268.2 kPa


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Detail Calculation Method= (drop by piping) + (drop by fitting) eq.6

Pt 1=Pa× 𝐿 eq.7

��𝑤=40.4 𝑙 /𝑠

260pa

Figure 3.5. pipe sizing

D=150mm


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⇒P t1=260×16=4160Pa=4.16 kPa Pressure drop by fitting

• Elbow, Tee; Y-strainer, Flexible• Valves: Balancing, Butterfly, Motorize, check valve

Conservation of mass : eq.8

; eq.8;

•


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Elbow;

eq.7

Fig 3.6. Equivalent length in meters of pipe for 90 Elbows


L=5.1m

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Tee• Tee (300mm to 150mm)The % of water flowing through circled branch

L=n×l eq.9

• n: number of elbow; • l: equivalent length in meter (m)


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100%

Flow condition

n=1.7

Fig 3.7 % of water


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eq.10

• 154.53 l/s D=300mm=0.3m

V=4×154.53

1000×3.14×0.32 =2.187=2.2m / s

Fig 3.7. L=1.7 9.1=15.47

Fig 3. 5 Pt=120×15.47=1856.4 Pa


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Equivalent length in meter of valves; l(m)Dimension, D=150mm

Accessory Y-strainer Balancing Motorize Flexible Butterfly CheckLength(m) 34 34 1.4 1.4 1.4 18

Table.2. Equivalent length in meter of valves

Y-strainerBalancing valve Pt=260×34=8840 Pa

Butterfly valve

Motorize valve

Check valveFlexible


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Summarize total loss in pipe & fitting for the system

Comparison

Estimation: Detail:

Pressure drop total selection: Error


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Chiller water pump Data selection

No Description

Flow

Rate

Pressure

drop Safety Coeff.

Total Pressure

drop

l/s kPa 20% kPa

1 CHWP-1 40.4 270 1.2 324

2 CHWP-2 40.4 270 1.2 324

3 CHWP-3 40.4 270 1.2 324

4 CHWP-4 40.4 270 1.2 324

Table 3.2. Cooling selection


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Chilled Water Pumps ScheduleITEM DESCRIPTION SPECIFIED

1 Ref. CHP-1~4 2 Quantity (set) 4 ( 3 Duty + 1 Standby )3 System Chilled Water System4 Location GF Chiller Plant Room

5 Type End suction or Horizontal Split Casing

6 Flow Rate (L/s) 40.47 Pump Head (m) 32.48 Pump Speed (rpm) 1450 9 Pump Efficiency (%) Not Specified

10 Motor Power (kW) 30

11 Power Supply (Volt/Phase/Hz) 380/3/50

12 Motor - Type TEFC

Table 3.3. chilled water pump schedule

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Mass flow rate: From: eq.3

Total Pressure drop: Estimation method

=[2L(m)100% 400 (kPa/m)+CT(kPa) +H(kPa)]eq.11

• H=3.8m=38kPa Height of CT; L=105m; Loss in CT=65kPa; 100%: loss by fitting; 2: Return and supply pipe

𝐏𝐓𝐨𝐭𝐚𝐥=𝟐𝟕𝟏𝐤𝐏𝐚

3. Condenser water pump

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Detail Calculation, we calculate as Chiller water pump

Comparison

Estimation: Detail:

Pressure drop total selection: Error

3. Condenser water pump

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No DescriptionFlowrate Pressure drop Safety Coeff P: total

l/s kPa 20% kPa

1 CHWP-1 48.5 280 1.2 336

2 CHWP-2 48.5 280 1.2 336

3 CHWP-3 48.5 280 1.2 336

4 CHWP-4 48.5 280 1.2 336


Table 3.4. Condenser water pump data selection

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Condenser Water Pumps ScheduleITEM DESCRIPTION SPECIFIED

1 Ref. CWP-1~4 2 Quantity (set) 4 ( 3 Duty + 1 Standby )3 System Condenser Water System4 Location GF Chiller Plant Room

5 Type End suction or Horizontal Split Casing

6 Flow Rate (L/s) 48.57 Pump Head (m) 33.68 Pump Speed (rpm) 1450 9 Pump Efficiency (%) Not Specified10 Motor Power (kW) 30

11 Power Supply (Volt/Phase/Hz) 380/3/50

12 Motor - Type TEFCTable 3.5. Condenser water pump schedule

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4. Make-Up Tank

Evaporation loss, Drift loss and Blowdown loss

Make upwater=Eva . loss+Drift loss+Blowdownloss Estimation of make up water calculation

• Evaporation loss=0.85%; • Drift loss=0.02%; • Blowdown loss=0.22%

=> Make up water=0.85+0.02+0.22%=1.09%

Water loss in

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; : water volume

V M=48.5× 1.09100 ×2 (h )=48.5×0.0109×2×3600

V M=3806 l=3.8𝑚3

V T=3.8𝑚3×4=15.2𝑚3

V T=15.2𝑚3

4. Make-Up Tank

CHILLER

FAN COIL UNIT

AIR HANDLING UNIT

2 WAY VALVE 2 WAY VALVE

FRESH AIR

TEMPERATURE SENSOR

RETURN AIRSUPPLY AIR

PRESSURE SENSOR

CHECK VALVETEMPERATURE SENSOR

PRIMARY CHILLED WATER PUMP(WITHOUT VSD CONTROL)

THERMOSTAT

25 %

24 °C

10 %

7 °C

23.5 °C

12 °C

COOLING TOWER

CONDENSER WATER PUMP

TEMPERATURE SENSOR

37 °C

32 °C

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After I finished my thesis

• Calculation

• Selection

V. Conclusion

• Understand about water cooled chiller system

• Concept of designing

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