36. How long Mixed Coolant (EG & DI water) can be stored in the coolant
(Hyundai requires 6month to exchange it)
A 36. Fuel cell system antifreeze is mainly
concerned with the parameter electrical conductivity, if the cooling loop is
very clean, can be stored for about 2 years. Therefore, SSL316 is
recommended for HEX.
35. Can we confirm the MIN / MAX allowable power change speed? (Can we share
power respond speed chart by different power to check the relativity between
temperature and performance)
A 35. What we can promise is an average loading and
unloading of 3-5kW/s. It can do 5-10KW /S but there is no guarantee of
34. Is it possible to design the VL-100kW system as a spark-proof system? KR
(End User) requires explosion-proof certified (a system that satisfies Zone 1
grade) Sensor, JB Box, etc.
A 34. Sorry, the vehicle system that this system is
mainly oriented to cannot meet the explosion-proof requirements. It involves
too many customized parts.
Q 33. Can we apply IEC
62282-2-100 in Shanghai? (Test protocol
will be provided by client)
A 33. Yes, this involves destructive testing and
requires business communication to reach an agreement
32. Can we provide “HAZOP” for VL-100kW system? (FMEA &
HAZID needs to be provided)
A 32. The basic version of FMEA can be provided
after the contract is signed
31. What is the required pressure / flow amount if client use HEX for the Aux
A 31. Pressure < 2barg, inlet temperature ≤65℃,
water flow at 30L/min
30. Can we share Heat amount from each VL-120kW Stack & BOP? (To confirm
the HEX size)
A 30. The system has two heat exchangers, one 180kW
and one 18kW, which can meet the heat dissipation requirements. Heat
dissipation of fuel cell system can be within 180kW, boost DC and air
compressor cooling maximum 8kW
29. Can we share the H2 consumption table or chart by different power? (H2
consumption /hr, by mass flow meter data)
A 29. At standard atmospheric pressure, 1kg
hydrogen =11.2 standard square
28. KR (End user) is requesting ZONE 1 level safety for the BOP and stack. If
DCDC is not suitable for ZONE 1 level safety, can we move the DCDC to the outside?
What is the Maximum length of cable between DCDC and Stack?
A 28. We need to evaluate the requirements of
Zone1, please help to send them to us. As shown in question 5, it is
recommended that the length of the high-voltage cable harness be about 4000mm
27. Can VL-100kW system’s DCDC boosting to 1000V? If need customizing of DCDC
how long do we need?
A 27. Custom development is required, the cycle
needs 6 months, the cost needs business communication
26. If the VL-100kW system, which is making 100kW of power, and the load are
suddenly cut off, the stack produces power for a few seconds. If the battery is
fully charged, where does this power (by remaining H2 and air inside) go? Can
the VL-100kW system consume itself?
A 26. The fuel cell system output power is based on
the power output requested by the load. When the fuel cell system output is 0
when the load is turned off instantly, the system will shut down in an
emergency and trigger code failure because the response is not that
fast. If the power cell SOC is full, I recommend shutting down the fuel
cell system early to allow the system to operate in the 20-90%SOC range Emergency
stop has a high risk of damage to fuel cell stack, and the loading and
unloading speed of the system is relatively slow, so it is suggested to add
batteries to buffer and protect the system
25. Can client stacking 2-3layers by VL-100kW with using HEX?
A 25. Same as in question 2, stacking 2-3 layers is
Do you have the requirement of MIN operation in a month or in a year?
A 24. Yes, it is recommended to start once a month.
How long Coolant can be stored without operation of system?
A 23. 2-3 months, it is recommended to open the
system regularly, cooling road deionizer can absorb metal ions and so on
Can we use the Coolant / DI water as belows? By 50:50 ratio?
- 50% ~ 100%DI
- Particle size＜100μm
- 50% ~
A 22. Conductivity＜2μs/cm; Fuel cell systems require dedicated
antifreeze or pure deionizer water, which is fine if it's pure ethylene glycol