Quality Identification of the Heat Collection System

The

thermal collection system takes high-efficiency photothermal conversion and thermal energy storage as its core principles. By optimizing the design of heat-absorbing coatings, flow channel structures and insulation materials, it achieves stable conversion and continuous output of solar radiation energy into thermal energy. It is widely used in solar heating, industrial heating, agricultural drying and other fields. In civil buildings, it is used in solar hot water projects to meet domestic hot water supply needs; in industrial scenarios, it supports steam heat supply in printing and dyeing, food processing and other industries; in the agricultural field, it assists in the temperature control management of greenhouses and grain drying. Compared with traditional energy equipment, the heat collection system has the characteristics of low carbon, environmental protection, low operating cost, and strong weather resistance. It is a key facility for the promotion of new energy technology and the realization of energy conservation and emission reduction goals.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for heat collection systems. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for quality appraisal of heat collection systems.

With the large-scale application of thermal collection systems in the field of new energy, related quality disputes are on the rise. The judicial dispute focuses on:

1. Disputes over performance indicators: whether the actual photothermal conversion efficiency reaches the value agreed in the contract and whether the heat loss coefficient meets the national standard requirements;

2. Material defects: the reflectivity of the heat-absorbing coating exceeds the standard and the metal flow channel is corroded and perforated. , Deterioration of thermal conductivity of insulation materials;

3, Process problems: Vacuum collector tube sealing failure leads to argon gas leakage, excessive porosity of welded joints causes media leakage;

4, Contract performance dispute: Core component brands or parameters do not match the technical agreement.

0 Such cases require comprehensive determination of quality responsibility through photothermal performance testing, material weather resistance analysis and system air tightness testing.

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The technical methods for quality appraisal of thermal collection systems mainly include:

1. On-site survey: Survey the system installation site to check the actual condition of each system component, installation process, operating environment, etc.

2. Performance test: Through special instruments and equipment, the system is tested for thermal efficiency, safety, service life, etc. Test methods must comply with relevant national standards or industry specifications.

3. Material sampling analysis: Carry out material sampling of key components of the system (such as collectors, pipelines), and analyze whether their materials and processes meet the design requirements.

4. Historical data analysis: Collect monitoring data during system operation and analyze the deviation between the actual operation of the system and the design parameters.

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A new energy company of the applicant signed a "Solar Heat Collection System Procurement Contract" with an equipment manufacturer of the respondent to purchase 200 sets of JRS-50 heat collection systems for district heating projects. After the first season of operation, 35 systems experienced insufficient hot water output temperature (measured peak value 45°C, contract requirement ≥ 65°C), resulting in substandard heating. The new energy company claimed that the equipment had design flaws, and the manufacturer argued that it was caused by the installation angle deviation and excessive water hardness.

identification analysis results:

The quality analysis expert group discussed and synthesized technical data on the "thermal collection system" related information, contract technical agreements, on-site investigation case materials and other data Analysis, the following quality analysis opinions were made:

The solar absorption ratio of the heat-absorbing coating of the heat collection system involved in the case is only 0.82 (contract requirement ≥ 0.92), the infrared emissivity is as high as 0.28 (standard ≤ 0.15); the vacuum tube leakage rate reaches 5×10⁻⁶ Pa·m³/s (standard ≤1×10⁻⁷ Pa·m³/s), the argon gas inventory is less than 30% of the initial value; the porosity of the flow channel weld exceeds 12% (standard ≤5%), and medium leakage leads to a decrease in heat exchange efficiency.

The appraisal conclusion concluded that the manufacturer failed to select qualified coating materials in accordance with the agreement, the vacuum tube packaging process was not up to standard, and there was a direct causal relationship between system defects and performance failure.

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Thermal system quality appraisal report should include the following content:

1, entrusted matters: appraisal purpose, appraisal scope.

2, identification basis: applicable laws, regulations, and standards.

3, identification process: detailed process of survey, testing and analysis.

4. Identification conclusion: whether there are quality defects in the system, the cause of the defects, and the severity of the defects.

05. Appraisal opinion: professional judgment on disputed points.

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