Fan coil quality appraisal

fan coil adopts the core principle of air circulation and heat exchange. It uses a motor to drive an impeller to supply air, and combines with a copper tube and aluminum fin heat exchanger to achieve cooling or heating functions. It is widely used in central air conditioning systems in commercial complexes, hotels, hospitals and other buildings. Typical applications include temperature regulation of hotel rooms, comfort renovation of office buildings and precision temperature control of data centers. Compared with traditional air conditioning terminal equipment, fan coil units have the characteristics of high efficiency, energy saving, space saving, and intelligent control. They are key equipment for building energy conservation.

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

As building energy-saving standards improve, fan coil quality dispute cases are gradually increasing. The judicial dispute focuses on:

1, performance index dispute: whether the actual cooling capacity meets the standard and whether the noise meets the design value;

2, material defect: insufficient wall thickness of the heat exchanger copper tube , The fin material has poor corrosion resistance;

3. Process problems: uneven spacing of fins and leakage caused by the welding process;

4. Contract performance issues: the delivery coil does not match the technical agreement.

1. Appearance inspection: Check whether the appearance, coating, logo, etc. of the fan coil unit meet the standards and requirements.

2. Performance testing:

Cooling/heating capacity test: Use a heat source measuring instrument to test the cooling (heat) output of the fan coil to verify whether it meets the design requirements.

Air volume test: Use an anemometer to measure the air outlet volume of the fan coil to determine whether it meets the design requirements.

3. Failure analysis:

The applicant, a hotel, signed a "Fan Coil Purchase Contract" with an air-conditioning equipment company, the respondent, agreeing to purchase 200 units of FP-68WA coil units for guest room renovation. After being put into operation, many coils experienced condensate leakage and excessive noise (actually measured 55dB), leading to customer complaints. The hotel believed that the equipment had quality defects and demanded compensation for losses. The equipment company argued that the problem was caused by improper installation, and both parties took the matter to court.

Identification analysis results:

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

The wall thickness of the copper tube of the fan coil involved is only 0.25mm (contract requirement) 0.3mm), the compressive strength is insufficient; the fin material is ordinary aluminum alloy (the contract requires anodizing), and corrosion occurred after 500 hours of salt spray testing. The fin spacing deviation reaches ±1.0mm (standard ≤±0.5mm), the air volume drops by 15%; there are trachoma (diameter 0.2mm) in the weld, and the leakage rate detected by helium mass spectrometry exceeds the standard by 10 times.

The equipment company failed to provide specified wall thickness copper tubes and anodized fins according to the contract, and the process control was not up to standard, resulting in equipment problems.

The fan coil 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.).