Questions and Answers - Part 2.pdf
PDF 80 KB Posted
- Attached to
- Chiller Replacement
- Solicitation number
- 36C25725Q0135
About this file
This is a Questions and Answers document for a VA chiller replacement project at the Herzog Veterans Resources Center. The document addresses 15 technical questions about the chiller replacement scope of work.
Key details include confirmation that an 80-ton chiller (not 100-ton) is being requested, the chiller rental company must relocate their temporary equipment during installation, downtime is limited to 5 hours on a Saturday, and some work must be performed outside normal business hours. Factory warranties are required for the new chiller. Multiple questions about the Energy Management System (EMS), pump specifications, and system analysis were directed to reference the Statement of Work (SOW). Technical concerns were raised about the existing pump being undersized at 138 GPM capacity and potential short-cycling risks, but these were deemed outside the solicited scope of work. The document reveals the existing chiller is only nine years old, suggesting external factors may have contributed to its early failure.
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Other files
| File | Type | Posted |
|---|---|---|
| S03 36C25725Q0135 0003.pdf | ||
| S02 36C25725Q0135 0002.pdf | ||
| Question and Answer - Part 3.pdf | ||
| Data Plate - A.pdf | ||
| Data Plate - B.pdf | ||
| S02 36C25725Q0135 0001.pdf | ||
| Site Visit Sign In.pdf | ||
| Herzog Chiller Picture with tree.JPG | JPG image | |
| Herzog Chiller 2nd picture with tree_.JPG | JPG image | |
| Questions and Answers.pdf | ||
| S02 36C25725Q0135.pdf |
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Text version
1. The scope of work in the solicitation describes replacement of the chiller. However, during the site visit, it was mentioned that there is a desire to upsize the existing chiller to 100 tons as opposed to the 80 ton chiller that currently exists. Please confirm what size chiller is being requested.
A: 80 Ton
2. If a larger chiller is going to be chosen, the pump will most likely need to be upsized as well. Please confirm if a new pump is being requested.
A: See Question 1.
3. The electrical to the existing chiller is too small to accommodate the larger chiller. Is upsizing the electrical service a part of this scope? This potentially will also apply to the upsize in pump as well.
A: See Question 1.
4. To facilitate replacement, it would be beneficial to relocate the existing temporary chiller (at least during the actual swapping out of the chiller). Is this possible? If so, would the awarded contractor need to move? Or would the company providing the temporary need to relocate?
A: It is a means and method; however, the Chiller rental company has to relocate their equipment.
5. How long can downtime be scheduled for to tie the new chiller back into the existing utilities? Chilled water and electrical.
A: Up to 5 hours on a Saturday.
6. Does any portion of this scope of work need to be performed outside of normal business hours?
A: Yes
7. What factory warranties are requested for the new chiller?
A: Yes
8. Would the VA consider conducting a thorough evaluation of the entire system before accepting bids for this solicitation? This would include scheduling another site visit to ensure all parties have a complete understanding of the system’s requirements and potential challenges.
A: Outside of the Scope of Work being solicited.
9. Which Energy Management System is currently controlling the existing system?
A: Please see SOW.
10. To what extent does this EMS control the chiller and the pump?
11. The existing pump appears to be significantly undersized, with a 2” inlet/outlet and a rated capacity of only 138 GPM. By typical engineering criteria (3.5 GPM/ton), this capacity is only sufficient for approximately 40 tons. Can you confirm whether this pump is intended to support the current or proposed system?
12. Is there any plan to evaluate or replace this pump to ensure compatibility with the new chiller?
13. If the system connects an 80‐ or 100‐ton chiller to the existing infrastructure, there is a significant risk of short‐cycling. This could drastically reduce the lifespan of the new chiller and lead to frequent warranty issues. How does the project plan to address these concerns?
14. In our professional opinion, engaging a professional mechanical engineer to analyze the entire existing system is crucial. Simply replacing the chiller with a larger one without addressing the root cause of the previous failure (likely insufficient water flow) could exacerbate current issues. Is there a plan to conduct a comprehensive system analysis before proceeding?
15. Given the existing chiller is only nine years old, it seems likely that external factors, such as inadequate water flow, contributed to its failure. Addressing these underlying issues is essential to prevent recurrence and to ensure the sustainability of the new system.
A: Please See SOW.
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