GB/T 39779-2021 in English
VALIDDesign guidelines for distributed energy system of combined cooling, heating and power
- Issued on:2021-03-09
- Implemented on:2021-10-01
- File Format:PDF
- Delivery:Via email within 5 business days
$311.00
《GB/T 39779-2021分布式冷热电能源系统设计导则》由TC459（全国能量系统标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Interpretation of the core content of the standard
GB/T39779-2021 stipulates the design specifications of distributed cooling, heating and power energy systems based on gas fuels. The system consists of a power unit, a cooling and heating unit and a energy storage unit. The standard highlights the principles of energy cascade utilization and energy efficiency priority, requiring the annual average waste heat utilization rate to be ≥75%, and the comprehensive energy utilization rate should comply with the provisions of GB/T33757.1.
Comparison of key technical requirements
| Technical indicators | Design phase requirements | Operation phase requirements | Test methods |
|---|---|---|---|
| Comprehensive energy utilization rate | ≥70% | ≥design value | GB/T2589 |
| Waste heat utilization rate | ≥75% | ≥design value | GB/T36160.1 |
| Utilization hours of power generation equipment | ≥4000h | ≥design value | NB/T32015 |
Main points of system design
Typical configuration scheme
Appendix A of the standard gives two system configuration modes:
1. Basic configuration: power generation + waste heat utilization + electric refrigeration
2. Extended configuration: adding energy storage system (cold storage/heat storage) + supplementary combustion system
Equipment selection principles
- Gas turbines or internal combustion engines are preferred for power units. Modular design is recommended when the unit capacity is ≤5MW
- The flue gas recovery temperature of the waste heat boiler should be ≥120℃, and the cooling water recovery temperature should be ≥75℃
- The energy efficiency of the refrigeration equipment must meet the first-level energy efficiency requirements of GB19577
Implementation suggestions
- Load analysis: The design daily load and the annual hourly load need to be calculated simultaneously. The building load shall refer to GB50736
- Energy efficiency evaluation: It is recommended to use the "second boundary" condition to calculate the comprehensive utilization rate of energy quality (considering energy grade)
- Adaptation management: Energy efficiency verification should be carried out after one year of operation. When the load rate is lower than 70%, the operation strategy needs to be optimized
Standard evolution analysis
Compared with the early distributed energy standards, GB/T39779-2021 has the following major breakthroughs:
1. Added comprehensive utilization rate of energy quality evaluation indicators (3.5 items)
2. Clarified system adaptation (3.6 items) and full process evaluation requirements (4.5 items)
3. Detailed gas supply system design specifications (6.3 items)
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