Q and A for Humidifier Solicitation.docx

Q1. Does the humidification system need flow control, and if so, what flow rate?

The humidification system would need a flow control for water vapor or steam flow-rate based on a humidity controller. The laboratory air supply is 0.35 kilograms per second (kg/s) at 125 pounds per square inch gauge (psig), and at typical room temperature range of 60 degrees Fahrenheit to 100 degrees Fahrenheit.

Q2. Does the system need a manual backpressure option?

Yes, the delivery pressure of the system should be variable and above 9 bar (132.3 psig or above) to be able to inject humidity into the air supply line. The delivery pressure should be variable to adjust the steam or water vapor ingestion rate.

Q3. Does the system need a cell controller?

The controller for humidity control is required.

Q4. What is the operating temperature (specs mention high temperature)?

The supply air temperature is at room temperature with typical range of 60 degrees Fahrenheit to 100 degrees Fahrenheit.

Q5. Can requirement of “a ¼-inch quick-connect, Swagelok compression fitting, or National Pipe Thread (NPT) connector” be substituted with “a flow meter with a valve (preferable to use a mass flow meter for the accuracy desired)”?

Flow-meter is required to know the mass-flow rate of steam (or water vapor) added to get the required relative humidity of air in the supply line.

Q6. Please confirm: “.35 Kg/hr or 0.35 Kg/s”?

The laboratory air supply mass flow-rate is 0.35 kg/s at 125 psig. Previously mentioned requirement for two (2) liters/min has been removed.

Q7. Can requirement for “9 bar or higher” output pressure be removed- or- can you alter specs so that the water pressure and air pressure maximums are both equal (35 psia)?

The nine (9) bar or above ingestion pressure is needed since the air supply pressure is 125 psig (8.5 bar). Water pressure specified is for water supply to the system to generate steam or water vapor. 35 psia is the lab facility water supply pressure. A water pump may be needed within the supplied system to generate steam/water vapor at higher pressure.

Q8. Would it make sense to increase the water to also be feasible at 9 bar water pump source?

A water pump may be needed within the unit. The water supply pressure specified is the building water supply pressure that can be used for this system with a DI filter. The DI filter is available in the lab.

Q9. Has it been considered that if collected in a chamber the flow will come to a stop when the pressure reaches the max pressure of the system?

The steam or water vapor ingestion pressure shall be higher than air supply pressure at 125 psig.