NAVFAC Design-Build Model Request for Proposal - Magazine

D30 GENERAL

RFP Part 3 including the Engineering System Requirements (ESR) provide project specific requirements.  The RFP Part 4, Performance Technical Specifications (PTS) provide generalized technical requirements that apply to multiple facility types and include more requirements than are applicable to any one project. Therefore, only the RFP Part 4 requirements that apply to the project and further define the RFP Part 3 project specific requirements are required.

D30 1.1 NARRATIVE

This section includes the construction of interior mechanical systems. This section covers installations inside the facility and out to the five foot line. See Section G30, Site Civil/Mechanical Utilities, for continuation of systems beyond the five-foot line.

D30 1.2 MECHANICAL DESIGN GUIDANCE

Provide the design and installation in accordance with the following references.  This Performance Technical Specification (PTS) adds clarification to the fundamental requirements contained in the following Government Standards.  The general requirements of this PTS section are located in PTS Section Z10, General Performance Technical Specification

UNIFIED FACILITIES CRITERIA (UFC)

UFC 3-400-10N, Mechanical Engineering

UFC 3-420-01, Plumbing Systems

UNIFIED FACILITIES GUIDE SPECIFICATIONS (UFGS)

UFGS 01 78 24.05 20, Facility Operation and Maintenance Support Information

D30 1.3 DESIGN SUBMITTALS

Submit design submittals in accordance with Z10, General Performance Technical Specifications, Part 2 Section 01 33 10.05 20, Design Submittal Procedures, UFC 1-300-09N, Design Procedures, UFC 3-401-01, Mechanical Engineering.

In addition, UFGS sections listed below or in the body of the PTS text are to be used by the Designer of Record (DOR) as a part of the design submittal. If the UFGS products or systems are applicable to the project, the DOR must edit these referenced UFGS sections and submit them as a part of the design submittal specification.  Edit the specification sections in accordance with the limitations stated in PTS section Z10, General Performance Technical Specifications.

UFGS 01 78 24.00 20, Facility Design Workbook (FDW)

D303002 DIRECT EXPANSION SYSTEMS

If coatings are indicated in ESR Section D30, provide with copper tube/copper fin construction or immersion applied, baked phenolic or other approved coating that passes the 3000 hour salt spray resistance test using the ASTM B117 procedure.  Field applied coatings are not acceptable.

D303002 1.1 VARIABLE REFRIGERANT FLOW SYSTEMS

Provide a complete system consisting of VRF heat pump units, branch circuit controllers, VRF fan coil units, and associated controls. Provide inverter driven heat pump units that utilize R410A refrigerant. In order to meet Energy Star requirements, heat pumps smaller than 65,000 Btuh require a minimum SEER of 14, EER of 11, and HSPF of 8.2; heat pumps that have an electric resistance heating section (or none) and are sized from 65,000 Btuh up to 135,000 Btuh to have an EER of 11.3, an IEER of 11.4, and a COP of 3.35 (rated at 47 deg F); heat pumps that have an electric resistance heating section (or none) and are sized from 135,000 Btuh up to 240,000 Btuh to have an EER of 10.9, an IEER of 11, and a COP of 3.25 (rated at 47 deg F).  On the branch circuit controllers, include multiple branch connections allowing for simultaneous heating and cooling utilizing hot gas refrigerant or sub-cooled liquid. The total capacity of the branch controllers must be between 50 and 150 percent of the rated capacity.

Size and install refrigerant piping in strict compliance with the manufacturer's requirements. Refrigerant piping must be clean, dry, and leak free. Prior to installation all refrigerant pipes must remain sealed. During installation and prior to filling, use nitrogen to maintain cleanliness and prevent oxidation and scaling while brazing. Install each system to provide proper oil return. Refrigerant piping must be copper, ACR type, ASTM B280. All joints must be sil-brazed. All thicknesses of piping must remain the same throughout the system. Individually pressure test and commission each refrigerant circuit. Perform pressure testing using nitrogen at 1-1/2 times the system operating pressure. Design each system to meet Refrigerant Piping and Heat Transfer Components ASME B31.9, Building Services Piping Code and design to allow for expansion and contraction.

D303002 1.2 HEAT PUMPS

D303002 1.2.1 Air to Air

Air-cooled, split system heat pumps with ducted air distribution.  Provide units factory assembled, designed, tested, and rated in accordance with AHRI 210/240 or AHRI 340/360.  Equipment to be Energy Star Qualified, and heat pumps must include the Energy Star label affixed to the equipment.  For small (less than 65,000 Btuh) air-cooled heat pumps, Energy Star requires a minimum 14 SEER, 11 EER, and 8.0 HSPF.  For medium (65,000 to 135,000 Btuh) air-cooled heat pumps, Energy Star requires a minimum 11.3 EER, 11.4 IEER, and 3.35 COP.  For large (136,000 to 240,000 Btuh) air-cooled heat pumps, Energy Star requires a minimum 10.9 EER, 11 IEER, and 3.35 COP.  Provide manufacturer's minimum recommended clearance around condensing units.  Size refrigerant piping in accordance with the manufacturer's recommendations. Insulate refrigerant piping suction lines and condensate drain.

D303002 1.3 CONDENSING UNITS

Air-cooled, split system air conditioner with ducted air distribution.  Provide units factory assembled, designed, tested, and rated in accordance with AHRI 210/240 or AHRI 340/360.  Condensing units with capacities greater than or equal to 135,000 Btuh to meet the minimum efficiency requirements specified by ASHRAE 90.1-2013 Table 6.8.1-1 "Electrically Operated Unitary Air Conditioners and Condensing Units".  Provide manufacturer's minimum recommended clearance around condensing units.  Size refrigerant piping in accordance with the manufacturer's recommendations.

D304001 AIR DISTRIBUTION

D304001 1.1 DUCTWORK

Except as specified herein, provide ductwork constructed, braced, reinforced, installed, supported, and sealed in accordance with SMACNA standards.

D304001 1.2 GRILLES, REGISTERS, & DIFFUSERS

Factory-finished grilles, registers, and diffusers.  Exterior and exposed edges must be rolled, or otherwise stiffened and rounded.

D304001 1.3 INSULATION

Provide external thermal insulation for all ductwork.  Insulate ductwork in Mechanical Rooms and exposed locations with rigid mineral fiber insulation.

D304007 EXHAUST SYSTEMS

NOTE: Power ventilation in a rare condition for some magazines, in most cases natural ventilation is require by the magazine definitive drawings. Delete this section only if power ventilation is required.

D304007 1.1 FANS

AMCA 210 certified, with AMCA seal.  Fan bearings must have a minimum average life of 200,000 hours at design operating conditions.  Provide bird screens for outdoor inlets and outlets.  Provide direct-drive type fans with means for verifying operation via the building DDC system or with speed controllers

D304007 1.2 ROOFTOP FANS

UL-Listed centrifugal fans with roof curb.

D306001 HVAC CONTROLS

D306001 1.2 ELECTRONIC CONTROLS

If required, provide programmable thermostats with built in keypads for scheduling of day and night temperatures with two setback periods per day. Provide independent summer and winter programs.  Thermostats must have temporary and manual override of schedule and battery backup.