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GB/T 41703-2022Design, installation and acceptance specifications for commercial & industrial and similar heat pump hot water system (English PDF)

商业或工业用及类似用途的热泵热水系统设计、安装、验收规范

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

October 14, 2022

Implementation date

May 1, 2023

Scope

GB/T 41703-2022 is the English-translated version of 商业或工业用及类似用途的热泵热水系统设计、安装、验收规范.

GB/T 41703-2022 tells designers and installers how heat pump hot water systems for commercial, industrial and similar use are to be designed, installed and accepted.

It applies to systems driven by an electric motor on a vapour compression refrigeration cycle, with a nominal heating capacity of 3000 W or more, taking heat from air or water to supply domestic hot water; heat pump hot water heating systems and systems for other purposes may refer to it.

Besides the symbols, the system design, the system installation and the engineering acceptance, it carries normative annexes on the user's maximum daily water consumption, the hot water quotas and temperatures for sanitary appliances, the calculated cold water temperature, the hourly variation coefficient Kh and hot melt operation. Issued on 14 October 2022, it has applied since 1 May 2023.

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Document preview — GB/T 41703-2022

National Standard of the People's Republic of China

ICS: 27.200
Classification: J 73

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Symbol
5 System Design
6 System installation
7 Engineering acceptance
Appendix A (normative) Calculation of the user's maximum daily water consumption
Appendix B (normative) One-time and hourly hot water water quota and water temperature for sanitary appliances
Appendix C (normative) Calculated temperature of cold water
Appendix D (normative) Hot water hourly variation coefficient Kh value
Appendix E (normative) Hot Melt Operation Requirements
Appendix F (Informative) Completion Acceptance Report of Heat Pump Hot Water System Project
Reference

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted.

1 Scope

This document specifies the system design, system installation and engineering acceptance of heat pump hot water systems for commercial or industrial and similar use.

This document applies to the use of electric motor-driven, vapor compression refrigeration cycle, with a nominal heating capacity of 3000W or more, using air or water as heat Design, installation and acceptance of heat pump hot water systems for the purpose of providing domestic hot water. Heat pump hot water heating system and heat pump hot water for other purposes The system can refer to this document.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document document.

GB/T 4272 General Principles of Thermal Insulation Technology for Equipment and Pipelines

GB 5749 Hygienic Standard for Drinking Water

GB/T 21362 Commercial or industrial and similar heat pump water heaters

GB 50015-2019 Design standard for water supply and drainage in buildings

GB 50054 Low-voltage power distribution design code

GB 50736-2012 Design code for heating ventilation and air conditioning of civil buildings

CJ/T 521 Domestic hot water quality standard

NB/T 34067-2018 Code for construction and acceptance of air source heat pump hot water engineering

3 Terms and Definitions

GB/T 21362 and the following terms and definitions apply to this document.

3.1 Domestic hot water

Hot water for bathing and toileting.

3.2 Heat pump hot water system

A system that absorbs thermal energy from the environment (air or water) to produce and supply hot water by operating a heat pump hot water unit.

Note: Including heat pump water heater, hot water storage tank (tank), circulating pump and other components.

3.3 Centralized hot water supply system

A system for supplying one (excluding single villas), several buildings or supplying hot water required by one or more functional departments in a multifunctional single building.

3.4 Full-time hot water supply system

Systems that supply hot water uninterrupted throughout the day, during work shifts or during business hours.

3.5 Hourly variation coefficient

The ratio of the maximum water consumption to the average water consumption.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 26 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

GB/T 18837-2026|GB/T 19569-2026|GB/T 22732-2026|GB/T 22733-2026|GB/T 22734-2026|GB/T 23682-2026

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