SHED closed evaporation test chamber is mainly used to measure the emission of fuel evaporation pollutants under the conditions specified by national/European/American standards and other regulations. The tests include: heat soak loss, refueling emission loss, and 24h/48h/72h daytime loss. . The temperature control range is +15~+60ºC, which can simulate two modes of constant temperature and day and night temperature changes.
For the evaporative emission test of the fuel tank, the Mini-SHED (Mini-SHED evaporative pollutant sealed chamber) standard equipment is mainly used. The fuel tank is placed in the sealed chamber of the equipment, and the ambient temperature in the sealed chamber is changed to simulate when the car is parked. The day and night changes in the ambient temperature are measured, and the fuel evaporative emissions of the fuel tank are measured twenty-four hours a day. To this end, we have proposed a technical solution for a SHED evaporation pollutant sealed cabin for your reference in test selection.
Project Name: Environmental Instrument SHED Evaporation Pollutants Sealed Chamber
Contents of the plan: Innovative designs such as membrane bag fixing devices, support components, and sensor components are adopted to enable the closed cabin to maintain pressure balance during the test and ensure the accuracy and reliability of test data.
GB18352.3-2005 Light-duty vehicle pollutant emission limits and measurement methods (China III and TIV stages)
GB18352.5-2013 Light vehicle pollutant emission limits and measurement methods (China Phase 5)
GB18352.6-2016 Light-duty vehicle pollutant emission limits and measurement methods (China Phase Six)
T/CSAE 121-2019 "Test Method for Evaporative Pollutant Emissions from Non-Fuel Related Vehicle Parts and Materials"
European standard (Euro 6), American standard EPA (Code of Federal Regulations40O Part 86 (EPA Tier-I)) and American standard CARB (CCR Title13 (CARB LEV I-II)) related technical requirements
SHED evaporative emission test closed chamber working principle:
The product is placed in a sealed chamber of the equipment, and by changing the ambient temperature in the sealed chamber, it simulates the day and night changes in the surrounding ambient temperature when the car is parked, and measures the fuel evaporation emissions of the fuel tank 24 hours a day.
The following factors ensure test reliability:
Low background emissions significantly below legal specifications
Delivery of fully assembled systems
Short on-site installation and commissioning times
Determine the size of the test chamber according to the size of the sample (drive-in, walk-in, mini SHED, micro SHED, running loss SHED, drive-in (driving on a dynamometer)
| Project |
Require |
| Brand |
HUANYI instruments |
| Volume inside the box |
(1.0+0.02) m³ |
| Dimensions |
1200x1500x1550mm (length x width x height) |
| Adjustable range of temperature inside the test cabin |
(15-40)ºC |
| Internal relative humidity adjustable range |
(30-60)% |
| Air flow rate inside the box |
(0.1-0.3) m/s |
| Air replacement rate |
(0.2-3) m³/h |
| Sealing |
When there is an overpressure of 1000P8, the gas leakage is less than 10-3x1m³/min, and the gas flow difference between the inlet and outlet is less than 1% |
| Background concentration in the test chamber |
Toxic acid ≤0.006mg/m³ |
| Adiabatic |
Climate chamber walls and doors should have effective thermal insulation |
| Noise |
The noise when the climate box is working <=60dB |
| Continuous working time |
The climate chamber has a continuous working time of 28 days |
| Monitoring parameters |
Monitor and display the temperature and humidity in the cabin, air supply and exhaust volume, power on and off time, working time, data can be transferred and stored |
| Humidity control method |
The dew point control method is used to control the relative humidity of the working cabin. The humidity is stable, the fluctuation amplitude is <3%.rh, and no water droplets will be produced on the bulkhead. |
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