Attachment 16-Ft Sill Air Cooled Chiller Options R07-22-2022.pdf
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- Attached to
- Fort Sill MATOC - Solicitation
- Solicitation number
- W9124L-23-B-0001
About this file
This document outlines air cooled chiller options and specifications for a Fort Sill Multiple Award Task Order Contract solicitation. Key details include specifications for a freeze protection system to operate down to -20°F, an evaporator with a maximum leaving water temperature of 42°F and 14°F temperature differential, a propylene glycol evaporator fluid system at 15% concentration for both 4-pipe and 2-pipe applications, an ambient operating range of 0°F to 125°F depending on chiller location, BACnet controls with a remote interface, and pump, buffer tank, temporary chiller connection, and heat trace requirements. Basis of design equipment is specified as Trane or Carrier chillers.
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Text version
Revision 07/22/2022
Fort Sill, Oklahoma
Directorate of Public Works
Air Cooled Chiller
Options
1. Freeze Protection: With Freeze Protection
Immersion heaters to protect the evaporator to an ambient of -20ºF (-29ºC)
2. Evaporator: LWT Max= 42F and ΔT ≥14F
3. Default Evaporator Control: freeze protection control is enabled and will request the start of the chilled water pump with ambient temperatures less than the evaporator low leaving water temperature setpoint. The pump remains ON until the minimum evaporator water temperature is greater than low leaving water temperature setpoint plus 7°F. The minimum on time for the pump is 5 minutes.
4. Evaporator Fluid Type: Propylene Glycol
5. Evaporator Fluid Concentration: 15% for 4 & 2 pipe system
6. Condenser Unit Application: Wide Ambient 0⁰F - 125⁰F
7. Ambient Air Temperature: 105 ⁰F minimum & 115 ⁰F depending on chiller location
8. Elevation: 1130 ft
9. Controls Remote Interface: BACnet
10. Single Point Power with unit mounted circuit breaker
11. Misc. Features:
a. Installation Accessories – Elastomeric Isolators
b. Appearance Options – Louvers (hail guards)
12. Pump Package: include if limited space in mechanical room.
13. Buffer Tank: verify system volume is large enough. Can be internal or external to chiller.
14. Include temporary/backup chiller connections exterior to building to connect a portable chiller.
15. Heat Trace: include on all above ground piping internal and external to chiller.
16. Basis of Design: Trane or Carrier
Attachment 16 - SEED Project 4702 W9124L-23-B-0001 0003 Fort Sill MATOC
File details come from the government source that posted it. Updated .