Qs_and_As Excel Sheet Growth Chambers R02.xlsx
XLSX spreadsheet 27 KB Posted
- Attached to
- Environmental Growth Chambers, HVAC, and Controls Replacement, Moore Air Base, TX Federal contract opportunity
- Solicitation number
- 12639525R0019
About this file
The file is a Questions and Answers (Q&A) Excel sheet for Solicitation 12639525R0019, a USDA-Animal and Plant Health Inspection Service construction project at Moore Air Base in Edinburg, Texas. The project involves replacing 11 environmental growth chambers (8 EGC units and 3 Rheem SEER units), including HVAC units, chilled water coils, control valves, and associated systems. Key technical requirements include maintaining precise temperature (4-50°C, typically 20-28°C) and humidity (40-90% RH, typically 50-70% RH) for research purposes, with a DDC system to be integrated with the base EMCS system.
The solicitation is set aside for small businesses in the NAICS code 238220 (Plumbing, Heating, and Air Conditioning Contractors) with a size standard of $19 million. The estimated project magnitude is between $1-5 million. Additional project specifications include replacing lighting with full-spectrum LED systems, implementing independent third-party Test and Balance (TAB) and commissioning, and requiring all mechanical, electrical, and control documents to be stamped by a Texas Professional Engineer. The project will involve design-build delivery, with final designs to be prepared and sealed by a licensed PE before procurement and fabrication.
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| 12639525R0019-0003.pdf | ||
| 12639525R0019-0002.pdf | ||
| RFIs and responses.docx | DOCX document | |
| Building 6414 EGCs Attendance Site Visit.pdf | ||
| IMG_0110.jpeg | JPEG file | |
| IMG_0112.jpeg | JPEG file | |
| IMG_0113.jpeg | JPEG file | |
| IMG_0111.jpeg | JPEG file | |
| IMG_0109.jpeg | JPEG file | |
| IMG_0117.jpeg | JPEG file | |
| IMG_0115.jpeg | JPEG file | |
| IMG_0107.jpeg | JPEG file | |
| 12639525R0019-0001.pdf | ||
| 12639525R0019.pdf | ||
| Atch 2_Federal Construction Wage Rates_Hidalgo County.pdf | ||
| Atch 1_SOW_6414 EGC and Rheem Seer Replacement.docx | DOCX document |
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Text version
Sheet1
| Solicitation 12639525R0019 6414 Growth Chamber HVAC Units and Controls Replacement | |
| Contractor Question/RFI or Recommendation | Government Response |
| How many growth chambers are required to be renovated | 8 EGC's and 3 RHEEM SEER Total 11 |
| What are the room / Chamber box numbers included in this SOW. Per the attached General Drawing EGC Units 1-12 & per site walk. What room numbers above the doors at each chamber: IE Room 10-26? | EGCs 13 thru 20 and Kysor/Rheem Seer 1-3 |
| How many Chilled water coils / Evaporators are required to be replaced | One per chamber; replace all chamber cooling coils. Total = 8 Rheem Seer units have diferent systems 3 |
| How many Chilled water 3 way control valves are required to be replaced W DDC | One per coil; replace all. Total = 8 Rheem Seer units have diferent systems 3 |
| How many chilled water pumps are required to be replaced as part of this SOW | None |
| Are there any SOW requirements for any of the equipment to be DX (Refrigerant) Or is all equipment to be Chilled water | Chilled Water as that is what exists |
| Does the USDA have As-Builts for the Building | Not at this time but looking for drawnings |
| Does the USDA have As-Builts for the Growth chamber systems | No As-builts just EGC's information |
| What is the design LAT required for the Evaporator coils | That depends on what is being used. |
| What are the required growth chamber temperature setpoints | Capability 4–50 °C; typical operation 20–28 °C (design to maintain setpoint within ±0.5–1.0 °C under steady conditions |
| What is the required growth chamber Humidity setpoints | Capability 40–90 %RH; typical operation 50–70 %RH (design control ±2 %RH steady-state). |
| Is The DDC system required to be tied into the Base EMCS system | Yes. Provide BACnet/IP integration points (status, alarms, key trends). If EMCS is not ready on Day 1, panels shall be EMCS-ready. |
| Is the DDC system required to be ready to tie into EMCS system in the future as part of a future solicitation | Yes. Provide all hardware/software points and network provisions for future EMCS connection. |
| Due to the extensive nature of this scope, we feel that this SOW needs to be designed by a Design firm then sent out for Bid | The Government intends performance-based, design-build delivery. Final design shall be prepared and sealed by a licensed PE and submitted for approval prior to procurement/fabrication. |
| Are there any aspects of this project that require an Engineer's design or stamp | Yes. Mechanical, electrical, controls (DDC), and life-safety documents, load selections, sequences, and calculations must be Texas PE-stamped. TAB report and commissioning plan to be signed by certified firms. |
| During the site walk, there was discussion of a outside air Air handler, how does this tie into the growth chamber system, controls, ductwork & refrigerated box | OA AHU provides tempered ventilation/pressurization to the chamber areas; it does not serve as process cooling for EGCs. DDC coordinates OA, space pressure, and exhaust; EGC coils handle process temperature/RH. |
| How many outside air Air Handlers are required to be replaced as part of this scope & Which one (s) | None |
| Are there requirements for the Coils, Driers, OA AHU's to be increased in size or to add BTU's due to new testing requirements | No upsizing required. Match or exceed existing capacities to meet stated temperature/RH tolerances. Provide coil selections at design duty with minimum 10–15% margin where vendor standards require. |
| During the site walk, there was discussion of driers on top of the growth chamber refrigerated box, how do these tie into the growth chamber system, controls, ductwork & refrigerated box | This is for the Outside Air Exchange system for Humidity Control |
| How many driers are required to be replaced as part of this scope | 2 per unit 16 |
| How Many Steam Generators are required to be replaced per scope | None |
| Atch 1_SOW Para 4.1.1 calls for Kysor / Rheem SEER EGC (Qty 3) these brand units were not seen during the site visit. Where are these units located and are they part of the SOW | They are located in the oposite side of the building, they were missed during the site visit but information can be provided with Pictures if needed. |
| Atch 1_SOW Para 4.1.3 calls for demo of refrigerant pipe. What units/systems are tied to refrigeration? Per the site walk all equipment is chilled water | Only for the Kysor Rheem Seer systems (1-3) as a package unit no more than 20 feet toal. |
| Atch 1_SOW Para 4.1.3 calls for New Evaporators & Air cooled condensers on the roof. Where do these DX units tie into the system as per the site walk all equipment is chilled water. No DX equipment was visual during the site walk | Those are for the Kysor Rheem Seer Systems only |
| What are the lumens required for the new lighting package | Specify by PPFD at canopy height: 100–1,000 µmol/m²/s, dimmable 0–100%, ±10% uniformity. For reference, this equates roughly to 5,000–50,000 lux adjustable. Full-spectrum LED with red/blue supplementation, photoperiod programmable. |
| Are there any electrical panel upgrades required as part of this SOW or are all existing to remain | None |
| Is the lighting to be tied to an automated control system | Yes. Tie chamber lighting to DDC for photoperiod scheduling, alarm/trend integration, and local override at each chamber. |
| Is 3rd party Test and Balance required as part of the Scope | Yes. Independent certified TAB of chilled-water flows and airflows is required; contractor self-certification is not acceptable. |
| Is 3rd party Commissioning required a part of the Scope | Yes. Independent commissioning (CxA) to verify temperature, RH, lighting, safety interlocks, alarms, trending, and sequence of operations for each chamber. |
File details come from the government source that posted it. Updated .