Attachment 1 - Statement of Work.pdf
PDF 131 KB Posted
- Attached to
- Chiller Replacement Parts Federal contract opportunity
- Solicitation number
- 12805B24Q0588
About this file
This document is a Statement of Work for a federal contract opportunity to replace a chiller system at the NCAH Campus Freezer Farm. The key details are:
The scope of work is to furnish a new 35-ton air-cooled heat pump chiller with two inverter scroll compressors, a 200-gallon chilled water buffer tank, and two inline centrifugal pumps. The current system is oversized and has experienced compressor failures. The new chiller must be more efficient, sized properly, and have controls to prevent short cycling. Technical requirements include using specified manufacturers, refrigerants, fan motors, and performance criteria. The government will provide piping, insulation, and controls. Delivery is required within 60 days of contract award. The acquisition will be awarded on a lowest price technically acceptable basis, with consideration given to contractors who can provide the equipment quickest. The solicitation number is 12805B24Q0588, and the NAICS code is 333912 with a 1,000-employee size standard.
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| File | Type | Posted |
|---|---|---|
| SF-18 with Clauses and Provisions.pdf |
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Text version
Statement of Work Project: NCAH Campus Freezer farm Chiller Replacement Project
GENERAL INFORMATION
1.0 Scope of Work: This scope of work is to furnish a new, 35 ton (nominally) air-cooled heat pump chiller with a minimum of two inverter scroll compressors, a 200 gallon (minimum) – four port chilled water buffer tank, and two inline- centrifugal pumps.
2.0 Background: The current air-cooled chiller system serving the NCAH freezer farm is oversized, and the compressors have failed multiple times due to cycling on and off frequently to cool the necessary space. The air-cooled chiller needs to be replaced with a more efficient air cooled chiller that is sized properly and has the necessary controls in place and the ability to turndown at a rate acceptable to prohibit short cycling of the compressors/chiller and to maximize the age and efficiency of the system.
CONTRACTOR REQUIREMENTS
3.0 Technical Requirements/Tasks:
3.1 Air Cooled Chiller:
3.1.1 The chiller shall be nominally 35 tons with two inverter compressors.
3.1.2 Manufacturer shall be York/JCI, Trane, Daikin, or approved equal.
(Basis of design is York/JCI).
3.1.3 Scroll compressors for chiller shall be inverter style compressors utilizing refrigerant R454b.
3.1.4 Electrical connection to the chiller shall be 460V, 3 phase, 60 Hz connection to a single point circuit breaker.
3.1.5 There shall be two fans on unit shall be high efficiency variable speed fans with EC motors.
3.1.6 Condenser coil shall be copper tubes with aluminum fins.
3.1.7 Chiller shall have wired upper and louvered lower enclosure panels and shall come with an acoustic sound blanket.
3.1.8 Neoprene vibration isolation and flow switch shall be shipped loose for field installation by government mechanics.
3.1.9 Chiller shall come with a smart equipment controller with touchscreen display that integrates with the campus Johnson Controls Building automation system.
3.1.10 Evaporator shall be a brazed plate heat exchanger sized for the use of 50% ethylene glycol solution.
3.1.11 Chiller selection/performance shall be based on the following;
3.1.11.1 54F/44F Entering and Leaving Fluid Temperatures
3.1.11.2 98 gpm flow rate at a 23 ft H20 pressure drop
3.1.11.3 EER 10.2, IPLV 20.02
3.1.11.4 Net Cooling Capacity: 33.88 Tons
3.1.11.5 Minimum Turnodown rate: 1/5
3.1.11.6 Total power input (KW): 40.82
3.1.11.7 2 total compressor circuits.
3.1.11.8 Unit MCA – 74.0
3.1.11.9 Fluid connection sizes – 2.5”
3.1.12 Factory Authorized start-up shall be included in this contract.
3.1.13 If optional adder for a quick ship is available, this must be included in the bid.
3.2 Chilled Water Buffer Tank:
3.2.1 Buffer tank shall have four (4) 4” connections.
3.2.2 Maximum allowable working pressure: 125 psig @450F
3.2.3 Tank shall be made from carbon steel with an exterior coating of red oxide primer.
3.2.4 Tank shell thickness shall be minimum 0.125” and head thickness shall be minimum 0.135.”
3.2.5 Tank shall be approximately 74” tall and 30” in diameter.
3.2.6 2 tank connections shall be located 13-1/2” from top of tank
(centerline) and 2 tank connections shall be located 15” from bottom of tank (centerline).
3.2.7 Manufacturer shall be based on Aerco or approved equivalent.
3.3 Primary Chilled Water Pump:
3.3.1 Chilled water pump shall be a variable speed, sensored inline centrifugal pump sized for 100 gpm at 35 ft of head.
3.3.2 Pump selection based off of B&G E-90 Stock 2AAC, part
#179658LF
3.3.3 Fluid is based on 50% ethylene glycol solution.
3.3.4 Motor shall be a non-overloading type motor.
3.3.5 Pump duty point efficiency shall be minimum 70% at the rated flow rate and pressure noted above.
3.4 Secondary Chilled Water Pump:
3.4.1 Chilled water pump shall be a variable speed, sensored inline centrifugal pump sized for 100 gpm at 25 ft of head.
3.4.2 Pump selection based off of B&G E-90 Stock 2AAC, part
#179658LF
3.4.3 Fluid is based on 50% ethylene glycol solution.
3.4.4 Motor shall be a non-overloading type motor.
3.4.5 Pump duty point efficiency shall be minimum 70% at the rated flow rate and pressure noted above.
*There is no trade-in requirement for this contract*
4.0 Government Furnished: The government will furnish all, piping, insulation, and controls necessary for the complete installation of this chiller.
5.0 Deliverables/Schedule Delivery within 60 days of date of award.
6.0 Evaluation Factors This requirement shall be lowest price technically acceptable. The bidders shall provide proposals with submittals for the air-cooled chiller, chilled water buffer tank, and two pumps that must meet the minimum performance technical requirements laid out in the scope of work.
*Special consideration in the evaluation will be given to the contractor that can provide the equipment the quickest to the USDA while still meeting the technical requirements laid out above*
7.0 Technical Point of Contact: Benjamin A’Hearn, 515-337-6159
8.0 Place of Delivery: 1920 Dayton Avenue, Ames Iowa 50010.
File details come from the government source that posted it. Updated .