NB/T 11176-2023
Monitoring and Evaluation Procedures for Solar Thermal Power Generation Projects (English Version)

Standard No.

NB/T 11176-2023

Language

Chinese, Available in English version

Release Date

2023

Published By

Professional Standard - Energy

Latest

NB/T 11176-2023

Introduction

Interpretation of the core content of the standard

"Code for Monitoring and Evaluation of Solar Thermal Power Generation Projects" (NB/T 11176-2023) is my country's first industry standard for the full life cycle monitoring of solar thermal power stations. It stipulates the evaluation methods and performance indicator thresholds for key links such as the collector system and heat storage system.

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Technical Framework Comparison

System module	Monitoring parameters	Evaluation indicators	Data accuracy requirements
Collector system	Mirror cleanliness, fluid temperature/pressure	Efficiency ≥ design value 90%	Class A radiation observation equipment
Heat storage system	Medium temperature, liquid level change	Thermal efficiency ≥85%	±0.5℃ temperature sensor
Steam turbine generator set	Main steam parameters, heat rate	Load change rate ≥ 3%Pe/min	0.2-level electric energy meter

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Key technical requirements

1. Calculation of photoelectric conversion efficiency

Adopt a dual formula system: a simplified formula (B.4.1) is used for long-term evaluation, and an energy chain formula (B.4.2) is used for short-term precise evaluation, which must include:

• Correction coefficient of the daylighting opening area of the collector field
• DNI data time resolution ≤ 1 minute
• Calculation of compensation for abandoned light rate

2. Thermal storage system evaluation

Simultaneous monitoring of direct/indirect thermal storage systems is required, and key parameters include:

• Daily temperature drop of molten salt storage tank ≤5℃ (high temperature tank)
• Integrated flow-enthalpy curve is required for thermal efficiency calculation
• Liquid level monitoring error±1cm

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Implementation suggestions

Data acquisition specifications

1. Establish redundant channels for DCS/SIS system
2. Set triple measurement points for key parameters (such as main steam flow)
3. Abnormal data identification adopts ISO 9060:2018 standard

Evaluation cycle management

It is recommended to carry out the evaluation in the following stages:

Stage	Duration	Key content
Trial operation period	30 days	Instrument accuracy verification
First year evaluation	Full year	Annual utilization hours verification
Periodic evaluation	3-5 years	Performance degradation analysis

NB/T 11176-2023 Referenced Document

• DL/T 1625-2016 Basic Technical Conditions of Centralized Monitoring System for Cascade Hydropower Plants
• GB 50794-2012 Code for construction of PV power station
• GB/T 51307-2018 Design standard for tower solar thermal power station

NB/T 11176-2023 history

• 2023 NB/T 11176-2023 Monitoring and Evaluation Procedures for Solar Thermal Power Generation Projects

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