Experimental Study of a Hybrid Cooling Tower ฉบับแปล (1)

Experimental study of a hybrid cooling tower

BY

Jednipat Puechpanpaisan Nuttawut Meekla Muhammad Hamza Sarwar

Assoc. Prof. Dr. Wanchai Asvapoositkul

DEPARTMENT OF MECHANICAL ENG INEER ING

K ING MONGKUT’S UN IVERS ITY OF TECHNOLOGY THONBUR I

Introduction

Literature Review

Objectives

Scope of research

Time schedule

Outline

Project I 1st draft P. 2

Introduction

Fig.1 Ref: https://whatiswatertreatment.files.wordpress.com


Fig. 2

Cooling tower

Types?

Wet cooling tower

Dry cooling

tower

Introduction

Hybrid (wet/dry) cooling tower


Comparison Advantage & Disadvantage

Wet cooling tower

Advantages

• High performance • Low power consumption

Disadvantages • Water loss

Fig. 6 Wet cooling tower [2]



Dry cooling tower

Disadvantages

• Low performance • Large size • High power consumption

Advantages

• No water loss • Easy to clean because it is a close system • No water basin

Fig. 7 Dry cooling tower [2]



Hybrid Cooling

Tower

Disadvantages

• Difficult to operating

Advantages

• Low water consumption • High performance than Dry cooling

tower


Fig. 8 Fig. 9

Experimental Hybrid cooling tower

Fig. 10 Experimental under research of Asvapoosikul, W. andKuansathan [4]

- Mechanical draft - Counter flow induced draft


Fig. 11

Literature Review

Rezaei, E., Shafiei, S. and Abdollahnezhad, A. [5] - Reduce water consumption - A computer code was also written to

simulation - 12 compact air cooled heat exchangers was designed and constructed - Finally feasibility study was carried out to choose the best operating conditions for the hybrid cooling tower

(2008-2009)

Treeutok, S. [6] - Performance capability mechanical

draft counter flow cooling tower - Predict characteristic curve with CTI

standard - Analyze Thermal performance with

CTI standard and TDA then compared

(2011)

Kuansathan, T. [7], [8] - Compared Dry and Wet

cooling tower performance - Reduce plume condensation

about 21 – 77 % - Predict Wet and Dry cooling

tower behavior by representative of conditions in Thailand

(2012)

P. 9 Project I 1st draft

Kuansathan, T. [7], [8]

Literature Review

Experimental conditions Result

- Thermal performance is up to mass flow rate of water (L) divided by mass flow rate of air (G)

- When mass flow rate of air (G) increasing the Thermal performance will increasing too but COP will be decrease that cause by system requires power higher.

- If using COP to be the criteria for determining Thermal performance it should be use higher hybrid

ratio (𝐺𝑊𝐶𝑇

𝐺𝑇𝑜𝑡𝑎𝑙)

- In August to mid-October Hybrid cooling tower can reduce the water loss as much as possible.

Performance Evaluation of Hybrid (Wet/Dry) Cooling Tower in Thailand [7]


Experimental conditions

Literature Review

Our conditions Range of dry section

0 1 2 3 4 5

Range of wet section

5 4 3 2 1 0

Tdb,in = 50℃ Tdb,out = 47℃

Range of dry section =50 − 47 = 3 ℃

Performance Evaluation of Hybrid (Wet/Dry) Cooling Tower in Thailand [7]

Weather conditions in Thailand. Twb = 23 − 30 ℃ Tdb = 28 − 35 ℃

Resource: Thai Meteorological Department at Don Mueang airport station


Parameters

Inside air (V)


Parameters

Flow rate of water (L)


Parameters

Inside water of dry section ( Tw,in)

Outside water of wet section ( Tw,out)

Outside water of dry section ( Tw,out)


Parameters

Dry bulb temperature ( Tdb)

Wet bulb temperature ( Twb)


Parameters

กราฟความสัมพันธ์ระหว่าง Effectiveness กับ 𝐿

𝐺𝐷𝐶𝑇 [7] กราฟความสัมพันธ์ระหว่าง Wet tower characteristic

ℎ𝑚𝑎𝑠𝑠𝐴

𝐿 กับ 𝐿

𝐺𝐷𝐶𝑇 [7]


Parameters

กราฟความสัมพันธ์ระหว่าง Power (kW) กับ G (kg/s) [7] กราฟความสัมพันธ์ระหว่าง COP กับ G (kg/s) [7]


1. To study how Hybrid (dry/wet) cooling tower works

2. To study performance of a Hybrid (dry/wet) cooling tower

3. To study the proper functioning of dry and wet cooling tower from performance curve

4. To study and find out COP of three kinds of Cooling tower

Objectives


1. To study principle operating of the experimental equipment of Hybrid (dry/wet) cooling tower that consist of Casing & Louver, Water Distribution System, Fans, Fill, Collection Basin, Drift Elimination, Radiator and Pump

2. To study performance of Hybrid (dry/wet) cooling tower

3. Use COP as the benchmark to comparison heat exchanger performance of the three kinds of cooling tower

Scope of work


Procedure 2015 2016

Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May.

1. Study research articles that related with the research 2. Planning and scope of works 3. Study instruction of the experimental equipment 4. Prepare the experimental equipment 5. Improve Hybrid Cooling tower 6. Ready to test the experimental

7. Calculate characteristic performance of Hybrid (dry/wet) Cooling Tower

8. Calculate characteristic performance of Hybrid (dry/wet) Cooling Tower and conclusion

Time schedule


1. ASHRAE Handbook HVAC Systems and Equipment, 2012, Chapter 40 Cooling tower, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.,

Atlanta, USA, pp. 40.1-40.23.

2. รศ.ดร.สมเกียรติ บุญณสะ. วิศวกรรมโรงจักรต้นก าลัง. พิมพ์ครั้งที่ 5. กรุงเทพฯ : พิทักษ์อักษร, บทที่ 6 , หน้าที่ 312-359.

3. Cooling Technology Institute, Technical Paper Number TP93-01, Cooling Technology Institute, Houston,1993.

4. Asvapoosikul, W. and Kuansathan, T., 2014, “Comparative evaluation of hybrid (dry/wet) cooling tower performance”, Journal of Applied Thermal Engineering, Vol.

71, pp. 83-93.

5. Ebrahim Rezaei, Sirous Shafiei, Aydin Abdollahnezhad, 2008 – 2009, “Reducing water consumption of an industrial plant cooling unit using hybrid cooling tower”,

Energy Conversion and Management, Vol. 51, pp. 311 – 319.

6. Supawat Treeutok, 2011, “A simplified Methode on Thermal Performance Capacity Evaluation of Counter Flow Cooling Tower”, Applied Thermal Engineering 27,

Issues 5-6, pp. 910 – 917.

7. Mantheerapol Kuansathan, 2012, “Performance Evaluation of Hybrid (Wet/Dry) Cooling Tower in Thailand”, Journal of Energy Conversion and Management, Vol. 51,

pp. 311 – 319.

8. Mantheerapol Kuansathan, 2012, “Computational Model and Analysis of Hybrid (Wet/Dry) Cooling Tower Concept for Thailand”, Cooling Technology Institute, Vol.

31, pp. 2 – 23.

Reference


End

RECOMMENDATION & QUESTION


Make up

Cooling Tower Types ? (By flow type)

Mechanical draft Natural draft

Counter flow induced draft

Counter flow forced draft

Cross flow induced draft

Cross flow forced draft

Introduction


Fig. 1 Natural draft Cooling Tower [1]

Natural Draft Cooling Tower

Fig. 2 Ref: http://spxcooling.com/


Mechanical Draft Cooling Tower

Fig. 3 Conventional Mechanical-Draft Cooling Towers [1]


ท ำไมต้องศึกษำ Hybrid Cooling Tower

Fig. 4 The actual using of Cooling tower [3]


Picture


Method

Calculated by Tchebyshev method and CTI standard


Experimental Study of a Hybrid Cooling Tower ฉบับแปล (1)

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