Chiller quality appraisal

chiller is the core equipment that provides low-temperature cooling water through the refrigeration cycle. It is widely used in central air conditioning, industrial process cooling, cold chain logistics and other fields. In the commercial field, it provides stable chilled water sources for large complexes and hotels; in data centers, it ensures the cooling needs of high computing power equipment; in industrial manufacturing, it realizes precision mold temperature control; in the pharmaceutical industry, it maintains the stability of the vaccine storage environment. Compared with traditional refrigeration methods, chillers occupy a dominant position in the refrigeration system due to their high efficiency and energy saving (COP can reach more than 7.0), intelligent control (AI load forecasting) and modular design. They are the key equipment to achieve the "double carbon" goal.

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

With the development of intelligent and energy-saving chillers, quality dispute cases occur frequently. The focus of judicial disputes is:

1, performance index disputes: whether the cooling capacity and energy efficiency ratio meet the standards;

2, material and process defects : The evaporator copper tube has insufficient corrosion resistance, and the welding pores cause refrigerant leakage;

3, control system failure: the adaptive load adjustment function is missing, and the antifreeze protection threshold setting is unreasonable;

4, contract performance issues: the delivered equipment does not comply with the technical agreement.

Chiller unit quality appraisal technical methods include:

1. Performance test:

Measure the cooling capacity, energy efficiency ratio, noise and other performance parameters of the equipment, and compare them with the design requirements and contract agreements.

2. Structural inspection:

Check whether the appearance, component installation, pipeline connection, etc. of the equipment meet the design requirements and whether there are defects or safety hazards.

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A data center of the applicant signed a "Magnetic Levitation Chiller Procurement Contract" with a refrigeration equipment company of the respondent, agreeing to purchase 10 units of MCW-500 equipment. After being put into production, the chiller unit frequently experienced evaporator leaks and the COP was only 5.5 (contract requirement ≥7.0), causing server downtime. The data center believed that the equipment had a design defect and demanded compensation for losses.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "chiller unit", contract technical agreement, on-site inspection case materials and other data, and made the following quality analysis opinions:

The evaporator copper tube of the chiller unit involved in the case is made of T2 material (contract requirements) TP2), insufficient corrosion resistance, Cl⁻ corrosion leads to perforation; the acid value of the refrigeration oil reaches 0.08 mgKOH/g (standard ≤ 0.03), which accelerates compressor wear; there are pores in the copper pipe welding (X-ray inspection shows a defect rate of 3%), and the leakage reaches 0.5kg/month; the antifreeze protection threshold is set to 0℃ (standard ≥2℃), causing the evaporator to freeze and crack.

The refrigeration equipment company failed to provide TP2 copper pipes and qualified refrigeration oil according to the contract, and the control system parameter settings were incorrect, which was the main reason for the equipment problems.

The chiller unit quality appraisal report should include the following content:

1. The purpose and basis of the appraisal.

2. Model, specification, manufacturer and other information of the equipment being identified.

3. Identification method.

4. Identification results (including whether there are quality problems, causes of problems, etc.).