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Applied Analysis of the Direct Cooling by Cooling Towers in Lanzhou Area

  • Xiaowei Wang
  • Wenhen ZhouEmail author
  • Lixin Zhao
  • Xin Bao
  • Lu Zheng
  • Xiaofei Han
Conference paper
  • 210 Downloads
Part of the Environmental Science and Engineering book series (ESE)

Abstract

Although the direct cooling to air-conditioning by cooling towers (DCCT) could be practice and energy saving in northwestern area of China due to dry climate, especially it’s nearly six months that the outdoor wet-bulb temperature is less than 6 ℃ in Lanzhou area, and few practical examples can be found. To provide the reference about this, the calculation and analysis about DCCT in Lanzhou area were done to obtain some operating parameters firstly. And then, based on which, a retrofitting work transforming cooling towers attached to the air-conditioning system of a hotel with a large inner zone in Lanzhou to DCCT was carried out, whose energy-saving rate is 84.7% and investment recovery period is about 0.32 years. The paper could be valuable for the practical application of DCCT in Lanzhou area.

Keywords

Building energy conservation Air-conditioning system Tower direct cooling 

Nomenclature

A

Area (m2)

CP

Specific heat of spray water (J kg−1 K−1)

CL

Specific heat of cooling water (J kg−1 K−1)

Fo

Coil area (m2)

Ga

Air flow rate (kg/h)

h

The enthalpy of air (kJ/kg)

hP

Enthalpy of saturated air corresponding to spray water (kJ/kg)

Ko

The heat transfer coefficient (kW/m2 K)

Km

The mass transfer coefficient (kg/m2 s)

L

Water flow rate (kg/h)

Q

Cooling load (kW)

s

The length of heat exchanger coil

t

The temperature of air (℃)

T

The temperature of water (℃)

td

The dry-bulb temperature (℃)

tw

The wet-bulb temperature (℃)

Subscripts

a

Air

i

Inside or inlet

L

Cooling water

o

Outside or outlet

P

Spray water

References

  1. 1.
    Li, L.: An adaptive research for water-side free cooling in Guizhou. Guizhou University, China (2018)Google Scholar
  2. 2.
    Hu, G., Zhang, W.: Energy saving analysis of tower cooling system for a hotel building in Changsha. HVAC 47(07), 63–66 (2017)Google Scholar
  3. 3.
    Meteorological Information Room of China Meteorological Administration, Tsinghua University. Special meteorological data set for China building thermal environment analysis. China Construction Industry Publishing house (2005)Google Scholar
  4. 4.
    Parker, R., Treybal, E.: The heat and mass transfer characteristics of evaporative coolers. Chem. Eng. Prog. Symp. 57(32), 139–149 (1961)Google Scholar
  5. 5.
    Hasan, A., Siren, K.: Performance investigation of plain circular and oval tube evaporatively cooled heat exchangers. Appl. Therm. Eng. 24(5–6), 777–790 (2004)CrossRefGoogle Scholar
  6. 6.
    Li, Y.: Closed Cooling Tower for Air-conditioning. China Building Industry Press, China (2008)Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  • Xiaowei Wang
    • 1
  • Wenhen Zhou
    • 1
    Email author
  • Lixin Zhao
    • 2
  • Xin Bao
    • 2
  • Lu Zheng
    • 2
  • Xiaofei Han
    • 1
  1. 1.School of Environmental and Municipal EngineeringLanzhou Jiaotong UniversityLanzhouChina
  2. 2.Gansu Institute of Architectural Design and Research Co. Ltd.LanzhouChina

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