GB/T 29044-2012Water quality for heating and air conditioning systems (English PDF)

Foreword

This document was issued on 31 December 2012 by the State Administration for Market Regulation; Standardization Administration of the PRC and takes effect on 1 September 2013.

It is a GB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard was proposed by Ministry of Housing and Urban-Rural

Development of the People's Republic of China.

This Standard shall be under the jurisdiction of National Technical Committee

on HVAC and Purification Equipment of Standardization Administration of China

(SAC/TC 143).

The drafting organizations of this Standard: China Academy of Building

Research, Beijing Kejingyuan Technology Co., Ltd., Beijing Ruiwater

Technology Co., Ltd., Heating Radiator Committee of China Construction Metal

Structure Association, Institute of Artificial Environment and Control, Zhongkai

University of Agricultural Engineering, Jilin Provincial Architectural Design

Institute Co., Ltd., China Aviation Planning Construction Development Co., Ltd.,

China Institute of Architecture Design and Research Institute of Mechanical and

Electrical Professional Design, Shaanxi Provincial Boiler and Pressure Vessel

Inspection Institute, Lanzhou Jiaotong University, Tsinghua University,

Guangzhou Key Public Construction Project Management Office, Corrosion

and Protection Center, School of Materials Science and Engineering, University

of Science and Technology Beijing; Environmental and Health-Related Product

Safety Institute, Chinese Center for Disease Control and Prevention; Modern

Design Group East China Architectural Design and Research Institute Co., Ltd.,

School of Municipal Environmental Engineering, Harbin Institute of Technology,

Guangzhou Yuexin Engineering Technology Co., Ltd., Dongguan Keda

Electromechanical Equipment Co., Ltd., Sende (China) HVAC Equipment Co.,

Ltd., Beixin Group Building Materials Co., Ltd., Reteg (China) Co., Ltd., Ningbo

Ningxing Golden Sea Heating Equipment Co., Ltd., Wanda Group Co., Ltd., Yile

Group, Yishapu Jintaige Radiator (Beijing) Co., Ltd., Henan Qianfeng Radiator

Co., Ltd., Shenzhen Haichuan Industrial Co., Ltd., Beijing Zhongyu Huateng

Energy Conservation and Environmental Protection Technology Co., Ltd.

Main drafters of this Standard: Wang Chuanfa, Ge Jing, Huang Wei, Ge Xiuling,

Song Weimin, Xiao Yuerong, Dong Zhongcheng, Yu Aoyuan, Ding Lixing, Wang

Feng, Song Xiaochun, Ma Tianbang, Wang Sanfan, Qiu Dong, Li Xiaogang,

Chen Xiping, Xin Junzhe, Yang Guang, Guo Dahai, Hui Qun, Guo Zhangeng,

Chen Guohui, Liu Xiaotian, De Luka, Wen Huitong, Huang Haibo, Guan

Zhonghai, Wang Xumao, Wang He, Huang Yongheng, Hou Yingbing.

Water quality for heating and air conditioning systems

1 Scope

GB/T 29044-2012 specifies the water that circulates inside heating and air conditioning systems. The water in a closed heating loop or a chilled water circuit is a working fluid, and it quietly determines how long the system lasts: too much hardness and the heat exchange surfaces scale, which costs energy invisibly and continuously; the wrong pH or dissolved oxygen and the pipework and terminal units corrode from the inside; the wrong conditions in an open cooling circuit and it becomes a microbiological problem with health consequences of its own. None of this is visible until something fails, which is why the water needs a specification rather than being whatever came out of the tap on the day of commissioning. This standard specifies the terms and definitions, the requirements and the inspection methods for water quality in heating and air conditioning systems. It applies to central air conditioning chilled and cooling water circuits, to direct evaporative cooling circulating water systems, and to the other heating and air conditioning water systems within its scope. Under ICS 91.140.01 and CCS P45, it is written for building services designers, commissioning and facilities management teams, and the water treatment contractors who maintain these circuits.

This Standard specifies the terms and definitions, requirements and inspection

methods for water quality for heating and air conditioning systems.

This Standard is applicable to circulating cold water system for central air

conditioning and circulating cold water system, circulating water system for

direct-evaporative cooling and indirect-evaporative cooling, as well as central

heating circulating hot water system with water temperature not exceeding

95°C.

This Standard is inapplicable to air conditioning humidification circulating water

system.

2 Normative references

The following referenced documents are indispensable for the application of

this document. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any

amendments) applies.

GB/T 1576, Water quality for industrial boilers

GB/T 5750.2, Standard Examination Methods for Drinking Water - Collection

and Preservation of Water Samples

GB/T 6904, Water used in industrial circulating cooling system and boiler -

Determination of pH

GB/T 6908, Analysis of water used in boiler and cooling system -

Determination of electrical conductivity

GB/T 11899, Water quality - Determination of sulfate - Gravimetric method

GB/T 11911, Water quality - Determination of iron and manganese - Flame

atomic absorption spectrometric method

GB/T 11914, Water quality - Determination of the chemical oxygen demand

- Dichromate method

GB/T 12157, Water for industrial circulating cooling system and boiler -

pressure of the heating and air conditioning circulating water system

3.2 cycle of concentration

the ratio of the salt content of the circulating water to the make-up water of the

open circulating cooling water system

3.3 indirect open circulating cooling water system for central air

conditioning

the central air conditioning circulating cooling water system that the circulating

cooling water and the cooled medium indirectly transfer heat, and the circulating

cooling water is in direct contact with the atmosphere to dissipate heat

3.4 indirect closed circulating cooling water system for central air

conditioning

the central air conditioning circulating cooling water system that the circulating

cooling water and the cooled medium indirectly transfer heat, and the circulating

cooling water and the cooling medium are indirect heat transfer

3.5 circulating water system for direct-evaporative cooling

the circulating cooling water system that cools and humidifies air through the

evaporation of water

3.6 circulating water system for indirect-evaporative cooling

the circulating cooling water system that cools the air through the evaporation

of water, and the air is not humidified when it is cooled