Project Background:

EST technicians have rich user experience in fuel evaporation emissions in China.
EST has over 18 years of experience in installation, debugging, and after-sales service, and is very familiar with the technology of this product.
The sealed chamber and other accessories developed by EST company
The closed chamber volume compensation system developed by EST company
Control software and control system developed by EST company
The closed room temperature control system designed and manufactured by EST company
The security protection system designed and manufactured by EST company
Specialized small chiller unit designed and manufactured by EST company
HC analyzer adopts the world's mainstream brands

Compliant with standards

European standards,
European emission standards V stage, VI stage

US EPA standards
CFR 40 86

Chinese National Standards
GB 18352.6-2016

Sealed chamber body

Mini SHED is an airtight rectangular compartment capable of measuring automotive components. The surface inside the warehouse will not adsorb hydrocarbons, and the volume compensation system can balance the internal pressure changes caused by temperature cycling and atmospheric pressure changes. Wall design can create good heat dissipation.

A sealed room is a self-supporting building constructed with 50mm thick insulation panels. The inner wall and floor are made of stainless steel, and the connection joints between the steel plates are airtightly welded. The exterior wall panel is made of galvanized sprayed steel plate (color to be determined or RAL9002 milky white).

The entrance and exit doors for the test samples are open outward. For safety reasons, the main door switch only provides manual mode.

Install expansion silicone rubber sealing rings on the outer frame of the entrance and exit doors of the test samples. When the expansion sealing ring is inflated, the strong inner skeleton of the gate frame can achieve the required airtightness of the expansion sealing ring. The materials inside the warehouse have been evaluated to assess their physical properties for volatilization or absorption of methanol fuel and HC.

The background emission of the sealed chamber itself is less than 1ppmHC.

External dimensions (W X L X H) approximately 2050 x 2050 x 2050mm
Internal effective utilization size (W x L x H) 2000x2000x2000m
Test entrance and exit door (W X H) 1800x1800mm
1 observation window (W X H) 400 x400 mm
2 spare cable through wall conduit E18 mm
Three stainless steel through wall pipes with an outer diameter of E8 mm
One propane injection pipe has been equipped
The maximum allowable load-bearing capacity of the floor is 100kg/m ²
1 heating pad with a 220V power socket, 10A

The size of Micro SHED is smaller.
Sealed room lighting
The explosion-proof lighting fixture is installed on the observation window outside the warehouse to provide illumination for work inside the warehouse.

体积补偿系统Volume compensation system

This warehouse does not require additional control instruments to control the maximum allowable pressure difference of ± 100 Pa between the atmosphere inside and outside the warehouse. Can adjust the rated volume by ± 7%. The rated volume repeatability is within ± 0.5%.



The system includes two separate compensating airbags.



Airbag 1:

Located on the outside of the top compartment plate, it is connected to the volume inside the compartment through two pipes equipped with small circulating fans and airtight valves. During the emission test, continuous air sweeping makes the air inside the airbag a part of the entire chamber's air.



Airbag 2:

Located on a porous thin plate at the top of the warehouse. Its internal volume is connected to the atmosphere through a pipeline equipped with valves and fans.



When the temperature of the airbag 1 increases or the atmospheric pressure decreases, it inflates due to the increase in volume and contracts when the temperature decreases or the atmospheric pressure increases.



Inflate airbag 2 at high atmospheric pressure or (and) low cabin temperature and pressure.



Before each experimental phase, in order to determine the starting volume, two airbags need to be emptied to a level with good repeatability. The porous tube inside the airbag flattens the airbag.

Temperature regulation/airflow management system

The regulation principle uses a two-stage water circulation circuit to indirectly regulate the internal air. The large-area copper heat exchanger and recirculation fan are arranged behind an independent air conditioning partition on the rear wall.

Temperature range+10 ° C to+60 ° C



The temperature error is ± 0.5 K within the range of+15 ° C to+45 ° C, which is better than the requirements of EPA and EC regulations; ± 1 K at temperatures below+15 ° C and above+45 ° C.



According to EPA and EC regulations, the temperature change rate is non-linear due to the different parameters of the sealed chamber.



Differential pressure ± 100 Pa



Circulating air flow rate max.850m ³/h



The maximum heat load inside the warehouse is 2000W



The surface temperature of the heat exchanger shall not be lower than 4.4 ° C (277.4K) and not higher than 70 ° C (343K) according to regulations.

Fresh air ventilation fan

There is an electrically driven airtight valve and a fresh air fan outside the warehouse wall. Air exceeding 850 cubic meters per hour is directly taken from clean air outside the warehouse to ensure cleanliness inside. The warehouse door needs to be manually opened.



The manufacturer provides imported flanges, and the user is responsible for connecting the inlet duct connected to the clean air outside to the flange on the warehouse.


Measurement system (HFID), (recommended manufacturer Horiba)

HFID is integrated on the control panel in the operating room. Two sampling hoses (one electrically heated and the other non electrically heated) connect the HFID from the control panel in the operating room to the compartment wall.

控制柜Control cabinet

Dimensions (W x D x H) 800x 500 x1900 mm



The control cabinet contains the following components:

-Main power supply wiring

-Main switch

-Mini SHED Warehouse Controller

-Transformer

-Siemens S7 PLC for handling subsystem functions

-Independent emergency stop system

-The software switches for "computer control" and "local control" are used for maintenance services of subsystems

To facilitate quick cable connections between on-site equipment and electrical cabinets, quick connect connectors are provided.

Evaporative emission measurement and control software

       The software and hardware control the evaporative emission testing in Mini SHED, which is easy to operate and has a user-friendly interface. All necessary graphics and instructions can be demonstrated in the attached description.



-The software is integrated into the MS Office environment and uses the MS Windows operating system

-The data of the tested vehicle and the test data are recorded in the record file

-Covering EURO, EPA and CARB regulatory standard testing procedures

-Provide multi-channel data acquisition for all important measurement values

-After measurement, reports and graphics can be printed from archive files in the predetermined format

-According to user requirements: reserve a backup channel when placing an order

-According to user requirements: During the warranty period, users will receive free software upgrades,

-Propane filling test

-The user manually completes the weighing of propane filling

-Users manually input data into the computer control program

-Display corresponding data on the computer screen

-Computer automatically completes calculations

-Computer display results

-User linear calibration

-User manual operation

-Users manually input data into the computer control program

-Display corresponding data on the computer screen

-Computer automatically completes calculations

-Computer display results

Hardware Description:

-Mainstream PC configuration

-19 "color LCD display

-Mouse, keyboard, serial interface

-PCI slot

-100M Ethernet card

-Modem

-2 USB slots

-High speed color inkjet printer (A4 paper) (provided by the user)

-      UPS

-Parameterization, data storage, and trend observation

-FID control (measurement/zero/range calibration through communication interface)

-Daytime ventilation test control with automatic HC sampling

-Sampling and observation of all measurement and calculation data (one value per second), report printing

-Data storage, 1 value per minute (temperature and pressure), including report printing

-Data storage of HC measurement values (including zero/range and sampling analysis sequence)

-Propane filling verification of Mini SHED

-Mini SHED leak detection function

-Trend curve display and historical data display

-Emission quality calculation and report viewing and printing

-User specific test loop editing

measure
pressure measurement 

Absolute pressure 2 pressure sensors

Differential pressure: 1 differential pressure sensor

Pressure sensor accuracy ± 10Pa

temperature measurement

Air temperature 2 Pt100

Temperature of chilled water: 1 Pt100, installed in the water pipe

Surface temperature of heat exchanger 1 Pt100, located in the heat exchanger

Pt100 sensor accuracy not exceeding ± 0.1 ℃
Pt100 sensor resolution not exceeding ± 0.1 ℃

safety system
HC alarm

Detection principle: catalytic combustion type,

Measurement range: 0-100% LEL;

Accuracy: ± 3% FS

Response time: ≤ 30S

Recovery time: ≤ 30S

Explosion proof mark: (GB3836.8-2003)，ExdIICT6

Explosion proof power plug

Emergency button

-1. Out of warehouse button
-1. External alarm (sound and light alarm)

Other features

Fans and explosion-proof protection within the measurement area.

Alarm for maximum and minimum temperature and pressure values


Alarm method
-Phase 1- Sound Alarm
The second stage - scavenging system is automatically driven by the second stage HC alarm signal, which is independent of manual or computer signals. The pipeline of the motor driven airtight valve with a limit switch will be opened, and this airtight valve is equipped with a limit switch.

Propane filling pipeline

The user provides the following devices:

-1 propane cylinder

-1 electronic scale

-1 switch valve

EST recommends that users purchase the following gases locally:

 
Chiller unit (option)

Outlet temperature: 5℃±0.5℃

Outlet flow rate: 6,000L/h

Export pressure: 3 Bar

Power supply: 220V，2KW

Supply cycle

Approximately 4 months after the contract takes effect