Answers_7.docx

Questions/Concerns and Answers:

Question 1:

What county are we in?

Answer 1:

Yuma County

Question 2:

Regarding answer to question #1, without actual design specifications I can’t speak for the actual operating conditions of the current Munters drier, however, based on specifications on driers we have used recently, both Munters and Innovative Air, on units with a low dew point at the outlet is needed, various configurations are applied to achieve that goal. (see attached). In two cases, a portion of the air passed through the descant wheel is routed at the re-activation air supply. In another case where “fresh” air is required, outside air is mixed with inside facility air. In this case, the inside facility air is of sufficient quality to supply the reactivation side without a by-pass loop. One thing to note in all the examples provided is that the inlet activation air is above the referenced limit of 288⁰F. In two of the case, air passing through the desiccant wheel in-route to the reactivation heaters has the potential to pick up any particulate which may have collected on the desiccant wheel and will then pass over the reactivation heaters which are open coil elements.

Another concern would be the process air blower and other components in the air flow path. Since in the re-circulation mode, potentially contaminated air passes through or is in proximity to these components, pursuant to SOW, para. 3.2.4.2, the drier should be rated accordingly, however, I am not sure that one is made.

Answer 2:

Makeup is separate from desiccant system in the current configuration.

Process air and reactivation air are separate.

This is our understanding of the current configuration. Regardless, vendors are encouraged to submit proposals which meet the requirements to the best of their ability. We are not necessarily looking for a copy of the existing system. Performance of system is how we will be evaluating proposals.

Question 3:

Regarding answer to question #2, the reference information provided is a bit confusing. Given both heating and cooling transitions are both 3 hours in length, the heating source described is stated as 3 – 1700 watt heaters is only 5100 watts total. This provides 17,340 BTUH of heating capability, please confirm, not sure where the additional heat required is coming from. The overall cooling potential as described might be in the 6-7X of that number. This would correlate with the assumption that approximately half of the “dead load” of the 6000 lbs. came out in the transition period.

b) Relative to the 1997 data: You state 6000 BTU “Live Load”, is this a typo? Are the temperatures stated in⁰F or⁰C? My initial assumption is that the data is in⁰C and the load was actually a 6KW live load. Please confirm.

c) Regarding the transition methodology, if the HC300 is running between 50% and 32⁰F, initial dry bulb not known, you would be putting hot dry air into the chamber, which adds to the cooling requirement, unless it is in a re-circulation configuration, whereas my previous concerns regarding contamination exposure and para. 3.2.4.2.

d) Regarding answer to question #9, can the ACC chamber be installed on the SMEE pad and sine this was not part of the original installation, is there additional power available if needed or does it have to come from the stated available numbers.

Answer 3:

"...answer to question #2" referenced was in response to question about the ACC, not the SMEE. Vendors are encouraged to submit proposals which meet the requirements to the best of their ability. We are not necessarily looking for a copy of the existing system. Performance of system is how we will be evaluating proposals. Performance of ACC will meet both the stated MIL-STD-810 requirements in addition to the MIL-STD-331. The SMEE does not need to meet the MIL-STD-331 profile, only the MIL-STD-810. Excerpts of the temp/humidity profiles were provided in the appendices.

b) The 1997 data was provided as a reference only. This was historical data we uncovered from our archives. No personnel presently employed were involved at the site at that time. We cannot provide additional information or assumptions. The proposal and delivered system will not be evaluated as they were in 1997. The SOW provided the performance requirements are need to meet for the new equipment.

c) As currently configured, the Munter's unit has met our testing needs to-date. The highest setting is +160F. If the vendor has identified a safety concern with the current configuration, please address it in the proposed system. Alternate configurations are encouraged if the existing design is insufficient or unsafe.

d) Not desired. ACC chamber does not necessarily get installed on the SMEE pad.

"The ACC shall be a complete stand‐alone turn‐key unit." It could be placed elsewhere on a concrete pad or improved surface (provided by the government). OK for vendor to assume it will be emplaced on an existing concrete pad or improved surface in proximity to required utilities and a network access point provided by the government.