Sealed Housing for Evaporative Determination (SHED)
SHED test chambers are used to measure the hydrocarbon emissions of cars, motor bikes and car components.
The legislators (EU, EPA, CARB, NSCN) stipulate the permissible emission limits and the verification procedure. The vehicle manufacturer must prove that the legal limits are complied with for the vehicle to be approved. Low background emissions are an important requirement for conclusive test results. In accordance with the EPA/CARB/EN standards, the limit may not exceed a value of 0.05 g. For our drive-in standard SHED, we guarantee background emissions of better than 0.007 g, measured after 4 hours in accordance with EPA sec. 86.117/96a.
The verification is undertaken in the SHED test chamber, equipped with the necessary analytic technology and test rig software for implementing tests and documenting results.
Reliable measurements are ensured by:
• Low background emissions clearly below the statutory specifications
• Delivery of completely assembled systems
• Very short assembly and commissioning times on site
• Variable size of test chamber, tailored to the sample (drive-in, walk-in, mini-SHED, micro-SHED, running loss SHED, drive-in for cars (driving conditions on dynamometer)
Instructions:
Place the fuel tank to be tested on the sample rack in the closed cabin, block all exits, and reserve only the pipeline connected to the carbon canister for breathing and exhaust. This pipeline is connected to the male connector on the bulkhead opening and leads to the cabin. outside.
Purge the gas inside the cabin, and after the hydrocarbon concentration in the air drops to a certain range (below 10ppmC), close the cabin door tightly. Run the test program to simulate the temperature changes throughout the day and night when the vehicle is parked, and use the FID (flame ionization detector) on the original Mini-SHED device to measure the changes in hydrocarbon concentration during the process. Simultaneous temperature sensors and pressure sensors record temperature and pressure. The weight of the hydrocarbons emitted is then calculated.
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
| 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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