SOW_-_Attachment_1.pdf

Statement of Work: Attachment 1

Individual Breakdown

Cooling of Communication Closet Spaces

Charlotte Air National Guard Base

October 10, 2017

Executive Summary

The purpose of this report is to update mechanical infrastructure in buildings at the North Carolina Air National Guard Base in Charlotte, North Carolina, and to provide appropriate cooling for communications equipment. It should be noted that the final design for each communications closet shoul d b e p r o v i d e d b y a m e c h a n i c a l p r o f e s s i o n a l .

Locating condensers near the fronts of buildings should be avoided where practical; condenser and other HVAC equipment (to include lines, electric cut‐offs, concrete pads) should be located as close to existing utility infrastructure as possible to not negatively impact the aesthetic quality of buildings.

Many communication closets were measured for temperature, while some were not. Ambient outdoor temperatures during the day(s) of data collection were approximately 44 degrees Fahrenheit. Warmer temperatures should be expected in summer months where communications equipment is located in a closet with exterior access and minimal (or non‐existent climate control). New cooling systems should be sufficient to address anticipated higher summer temperatures in these types of communications closets.

Projected heat generation was calculated based upon the quantity and type (model number/manufacturer) of devices in each communications closet using data provided by the 145th Communications Flight.

Hydrogen generation due to charging of uninterruptible power supply (UPS) systems has been accepted by experience to be negligible in requiring air exchanges in these rooms due to the frequency of human entry and number of times a communications closet door is opened. If this is found to not be the case (six months or more between human entry of space, or six months or more between opening the entry door) ventilation should be considered.

This report excludes reviews of several buildings due to ongoing C‐17 conversion projects. Specifically, Buildings

3, 7, 50, 51, and 64 were not included. Building 43 was recently renovated and cooling was deemed sufficient; Building 72 is a small communications room that was deemed to have sufficient cooling support by MSgt Jamie Britton of the 145th

Communications Flight.

SEER ratings for the ductless split‐system units provided should meet the following efficiency ratings (wall‐ mounted window units excluded):

24,000 BTU and greater = minimum 20.0 SEER

18,000 – 23,999 BTU = minimum 21.0 SEER

12,000 – 17,999 BTU = minimum 24.0 SEER

9,000 – 11,999 BTU = minimum 27.0 SEER

6,000 – 8,999 BTU = minimum 30.0 SEER

5,999 – 1 BTU = minimum 33.0 SEER

The Base Civil Engineer (BCE) or his designee may consider redundancy of systems for mission‐critical installations, doubling the cost associated with that communication closet installation/location.

Building 1 – Shoppette/Family Readiness/Wing Psychological Health Room number unmarked – Telecom

Existing conditions: room is cooled by the main building air conditioning system, and contains two racks. Highest measured temperature was 81.1F (enclosure of a piece of rack equipment) and lowest measured temperature was 69.5F (drywall).

Calculated max heat produced per hour: 22,750 BTU Calculated max cooling rating required: 2 ton unit

Requirement: AC mini‐split system rated at 2 ton.

Comm closet – Bdg 1 (in old commissary area) Two racks of equipment inside

Building 2 –1 Wing HQ Room near Room 102 & Conference Room

Existing conditions: Two racks of equipment in a storage room, interior walls on all sides. Highest recorded temperature was 92.8F (enclosure of equipment in rack), and lowest recorded temperature was 69.5F (drywall).

Calculated max heat produced per hour: 20,490 BTU Calculated max cooling rating required: 2 ton unit

Requirement: AC mini‐split system rated at 2 ton.

Two racks of equipment. This room also provides storage for various items.

Building 2 –2 Wing HQ Corner room near JAG area

Existing conditions: Two racks of equipment in a storage room, with two exterior walls. Highest recorded temperature was 87.3F (enclosure of equipment in rack), and lowest recorded temperature was 64.7F (drywall).

Calculated max heat produced per hour: 17,300 BTU Calculated max cooling rating required: 1.5 ton unit

Requirement: AC mini‐split system rated at 1.5 ton.

Exterior walls are to the left (behind plywood) and straight ahead.

Building 4 – 1 Room 212

Existing conditions: Two racks of equipment in a large storage room, interior walls all sides except one. Highest recorded temperature was 82.0F (enclosure of equipment in rack), and lowest recorded temperature was 70.9F (wall).

This room had exposed metal roof decking in the ceiling, no insulation observed to keep outside heat out of this room.

Existing insulated HVAC duct was observed traversing the ceiling of this room.

Calculated max heat produced per hour: 17,325 BTU Calculated max cooling rating required: 1.5 ton unit

Equipment rack. Existing insulated HVAC duct and metal roof decking (uninsulated).

Building 4 – 2 Room – Closet at the end of the Heritage Room (1st Floor)

Existing conditions: One rack of equipment in a small storage room, interior walls all sides. Highest recorded temperature was 85.5F (enclosure of equipment in rack), and lowest recorded temperature was 74.7F (drywall). On the other side of one interior wall is a very large open bay of an aircraft hangar.

Calculated max heat produced per hour: 12,175 BTU Calculated max cooling rating required: 1.1 ton unit

Requirement: AC mini‐split system rated at 1 ton, coupled with fan/louver vent system for air exchanges.

Rack of equipment inside small comm closet.

Building 5 – Small Air ‐ PAX Terminal Room Room Unlabeled – Closet accessible through PAX terminal

Existing conditions: One rack of equipment in a storage room, exterior walls at least one side. Highest recorded temperature was 86.2F (enclosure of equipment in rack), and lowest recorded temperature was 75.4F (drywall). It appears that a return vent exists in the ceiling of this room as evidence by the dust that has collected on the screen in the ceiling. No supply air ducting was observed in this room.

Calculated max heat produced per hour: 10,525 BTU Calculated max cooling rating required: 1 ton unit

Requirement: AC mini‐split system rated at 1 ton.

Access is from the PAX terminal. One rack of equipment.

Return air duct in the ceiling of the communications closet.

Building 39 – 1 Room – Inside Fuels Superintendent’s Office

Existing conditions: One rack of equipment in an enclosure mounted on the wall, exterior wall on two sides. Highest recorded temperature was 92.2F (enclosure of equipment in rack), and lowest recorded temperature was 81.4F (wall).

Existing AC vents in the ceiling already cool the area; moving a vent to direct cool air onto the enclosure would assist in keeping equipment at a suitable temperature.

Calculated max heat produced per hour: 4100 BTU Calculated max cooling rating required: 0.3 ton unit

Requirement: Relocating duct and vent.

Equipment Enclosure (wall‐mounted) Existing AC vent providing cooling to this office.

Building 40 – 1 Room ‐ Classroom

Existing conditions: One rack of equipment in a classroom, interior walls on two sides, exterior walls on two sides.

Highest recorded temperature was 89.0F (enclosure of equipment in rack), and lowest recorded temperature was 68.5F (drywall).

Calculated max heat produced per hour: 5225 BTU Calculated max cooling rating required: 0.4 ton unit

Minimum Requirement: Relocation of ceiling supply vent/duct to direct air onto the equipment cabinet.

Equipment cabinet in the Fire Dept classroom. Existing AC ceiling vents inside classroom.

Building 45 - 1 – Dining Facility Room near rear corner of kitchen – Telecom

Existing conditions: two full racks of equipment in a room in the rear of the kitchen area of the dining facility, interior walls all sides of the room. Existing ductwork appears to provide cooling from the building’s primary air conditioning system. Highest temperature measured in the room with a thermal camera was 90.5F (enclosure of a piece of equipment in the rack), and lowest measured was 76.6F (CMU wall).

Calculated max heat produced per hour: 20,250 BTU Calculated max cooling rating required: 2 ton unit

Requirement: Install 2‐ton mini‐split AC system.

Entry to Comm Closet from Kitchen area Two racks of equipment in this communication closet

Overhead diffuser – main building AC syst. Flex duct above diffuser Supply air vent

Building 45 - 2 – Communications Flight Room 210 – Network/Server Room

Existing conditions: Several racks of equipment, cooled by main building AC system, but with a supply and return installed very close proximity to each other; room has one exterior wall. Highest measured temperature was 82.8F (enclosure of equipment mounted in the rack) and lowest measured temperature was 72F (CMU wall).

Calculated max heat produced per hour: 32,675 BTU Calculated max cooling rating required: 3 ton unit

Requirement: Install two 1.5‐ton mini‐split system (dedicated to this room), plus relocate existing supply and return vents with damper to be a redundancy/back‐up system.

Comm equipment in four racks HVAC supply and return side‐by‐side (minimal effectiveness)

Building 61 – 1 Ops

Room across from Orderly Room

Existing conditions: Two racks of equipment in a storage room, interior walls all sides. Highest recorded temperature was 83.4F (enclosure of equipment in rack), and lowest recorded temperature was 70.9F (drywall). Existing AC duct was observed inside the room (near lights).

Calculated max heat produced per hour: 14,825 BTU Calculated max cooling rating required: 1.5 ton unit

Square rigid duct exists in ceiling near lights. This room has a very high ceiling.

Building 61 – 2 Room unlabeled – downstairs near AE Briefing Room

Existing conditions: One rack of equipment in a storage room, interior walls all sides. Highest recorded temperature was 84.1F (enclosure of equipment in rack), and lowest recorded temperature was 73.3F (drywall).

Calculated max heat produced per hour: 11,425 BTU Calculated max cooling rating required: 1 ton unit

Requirement: AC mini‐split system rated at 1 ton, coupled with fan/louver vent system for air exchanges.

This rack is very close to electrical panels, perhaps a violation of National Electric Code clearance requirements. Recommend that the 145 CF move this rack to comply with NEC requirements for clearance to provide access around electrical panels or seek exception to electrical code from BCE.

Building 62

Room labeled as “Storage” up exterior steps

Existing conditions: One rack of equipment in an attic storage room without insulation between the metal roof decking above and the building interior, exterior walls all sides except one. Highest recorded temperature was 65.7F (enclosure of equipment in rack), and lowest recorded temperature was 54.9F (wall).

Calculated max heat produced per hour: 5225 BTU Calculated max cooling rating required: 0.5 ton unit

Requirement: AC mini‐split system rated at 1/2 ton, coupled with spray‐in insulation on ceiling/roof, additional insulation to prevent heat outside the building from entering this space and overheating in the summer.

Exposed metal roof decking is not insulated inside room.

Building 63 – Supply Room 128 – Telecom

Existing conditions: one louvered vent over the doorway, cooling duct just above the equipment rack and fan pulling warm air from equipment, through duct, and pushing air out into the hallway. This room is an interior room in the building.

Calculated max heat produced per hour: 11,125 BTU Calculated max cooling rating required: 0.9 ton unit

Requirement: Air conditioner mini‐split system rated at 1 ton, coupled with existing fan/louver vent system for air exchanges.

Equipment rack – Bdg 63, Room 128 Overhead ductwork & louvered vent

Building 65 – AGE Room – Electric Room (upstairs near exercise room)

Existing conditions: One rack of equipment in a storage room, interior walls all sides. Highest recorded temperature was 92.8F (enclosure of equipment in rack), and lowest recorded temperature was 82.0F (drywall). Room has an existing split‐system AC unit inside.

Calculated max heat produced per hour: 4425 BTU Calculated max cooling rating required: 0.4 ton unit

Requirement: Insulation of exposed metal roof above, fans to circulate air from existing AC unit on wall.

Equipment rack inside Electric Room. Uninsulated metal roofing overhead.

Gaps between metal roofing and vertical wall.

Building 69 – Recruiting & Retention Room number not marked – Telecom

Existing conditions: closet is in the un‐finished space between the finished spaces of the front offices (Recruiting and Retention) and the Base Gym. Heating system and hot water heater are located above the communications closet.

Communications closet has a vent in the ceiling to allow warm air to rise out of this space.

Calculated max heat produced per hour: 5475 BTU Calculated max cooling rating required: less than 0.75 ton

Requirement: 1-ton window unit installed on the wall (pushing heat into unconditioned space), plus relocate the hot water tank/heater to ground floor level to avoid water leak damage to communications equipment.

Comm Closet built in space between front Computer equipment in rack inside closet offices (right wall) and Base Gym (left wall)

Building 74 – Munitions

Telecom equipment mounted in corner of small storage room

Existing conditions: Multiple uses for this room, including storage, communications equipment mounting, and food refrigeration.

Calculated max heat produced per hour: 4850 BTU

Calculated max cooling rating required: less than 0.75 ton – recommend fan cooling only

Requirement: Two (2) Low‐speed fans for cooling and moving air.

Computer equip. in black cabinet Building AC via window unit mounted on wall of building

October 10, 2017

Cooling of Communication Closet Spaces

New London Regional Training Site

Executive Summary

The purpose of this report is to update mechanical infrastructure in buildings at the North Carolina Air National Guard Base in Charlotte, North Carolina, and to provide appropriate cooling for communications equipment. It should be noted that the final design for each communications closet should be provided by a mechanical professional.

Locating condensers near the fronts of buildings should be avoided where practical; condenser and other HVAC equipment (to include lines, electric cut‐offs, concrete pads) should be located as close to existing utility infrastructure as possible to avoid negatively impacting the aesthetic quality of buildings.

Many communication closets were measured for temperature, while some were not. Ambient outdoor temperature during the day of data collection (2 August 2017) was approximately 86 degrees Fahrenheit. Exterior temperatures added to the heat load in communications closets with exterior walls.

Projected heat generation was calculated based upon the quantity and type (model number/manufacturer) of devices in each communications closet using data provided by the 145th Communications Flight.

Hydrogen generation due to charging of uninterruptible power supply (UPS) systems has been accepted by experience to be negligible in requiring air exchanges in these rooms due to the frequency of human entry and number of times a communications closet door is opened. If this is found to not be the case (six months or more between human entry of space, or six months or more between opening the entry door) ventilation should be considered.

SEER ratings for the ductless split‐system units provided should meet the following efficiency ratings (wall‐ mounted window units excluded):

24,000 BTU and greater = minimum 20.0 SEER

18,000 – 23,999 BTU = minimum 21.0 SEER

12,000 – 17,999 BTU = minimum 24.0 SEER

9,000 – 11,999 BTU = minimum 27.0 SEER

6,000 – 8,999 BTU = minimum 30.0 SEER

5,999 – 1 BTU = minimum 33.0 SEER

The Base Civil Engineer (BCE) or his designee may consider redundancy of systems for mission‐critical installations, doubling the cost associated with that communication closet installation/location.

Building 1

“Elect/Comm,” Closet 1‐1

Existing conditions: Room has all interior walls and existing Mitsubishi split‐system AC that was not running. Highest recorded temperature was 89.4F (enclosure of equipment in rack), and lowest recorded temperature was 83.2F (wall).

Calculated max heat produced per hour: 16015 BTU Calculated max cooling rating required: 1.5 ton unit

Requirement: Existing mini‐split AC system is not working, replace with 1.5 ton mini‐split AC.

Equipment rack Existing mini‐split (non‐functioning)

Building 1 “Elect/Comm,” Closet 1‐2

Existing conditions: Room has all interior walls, ducted building AC supply and return (too closely installed to be effective), and existing split‐system AC that was running but reported to require frequent maintenance (several equipment failures). Highest recorded temperature was 83.4F (enclosure of equipment in rack), and lowest recorded temperature was 72.2F (wall).

Calculated max heat produced per hour: 15075 BTU Calculated max cooling rating required: 1.5 ton unit

Requirement: Existing mini‐split AC system is only working intermittently, replace with 1.5 ton mini‐split AC.

Existing Daikin split‐system AC Existing AC ducted supply and return (side‐by‐side tiles)

Equipment rack with ambient temp thermometer showing 72F.

Building 8 “Electrical/Communications,” Closet 8‐1

Existing conditions: Room has interior walls with one exterior wall, and no AC infrastructure (no ducts from building AC system). Highest recorded temperature was 81.7F (enclosure of equipment in rack), and lowest recorded temperature was 73.6F (wall).

Calculated max heat produced per hour: 6350 BTU Calculated max cooling rating required: 0.5 ton unit

Requirement: Install 0.5‐ton mini‐split AC.

Equipment rack in Building 8 Comm Closet.

Building 12 Room 103, Closet 12‐2

Existing conditions: Room has all interior walls and existing supply and returns from building AC system. Highest recorded temperature was 84.3F (enclosure of equipment in rack), and lowest recorded temperature was 76.5F (wall).

Calculated max heat produced per hour: 11375 BTU Calculated max cooling rating required: 1.0 ton unit

Requirement: AC mini‐split system rated at 1.0 ton.

Equipment rack in Closet 12‐2 AC vent above equipment rack

AC vent on opposite wall

Room 161 (Secure vault), Closet 12‐5

Existing conditions: Room has all interior walls. One AC return and one AC supply was observed. This room is a secure vault and personnel on duty would not permit a thermal camera into the room because no cameras or other recording devices were permitted. As such, no temperature measurements were taken. The room felt warm.

Calculated max heat produced per hour: 4375 BTU Calculated max cooling rating required: 0.5 ton unit

Requirement: Install 0.5‐ton mini‐split AC system.

Room 203, Closet 12‐6

Existing conditions: Room has all interior walls. Highest recorded temperature was 88.7F (enclosure of equipment in rack), and lowest recorded temperature was 81.5F (wall).

Calculated max heat produced per hour: 10075 BTU Calculated max cooling rating required: 1.0 ton unit

Requirement: Install 1‐ton mini‐split AC.

Equipment rack in Closet 12‐6

Existing AC vent Existing AC vent

Building 30 - 1 Exterior Entrance

Existing conditions: Room has three interior and one exterior walls, with no existing AC cooling. Highest recorded temperature was 89.8F (enclosure of equipment in rack), and lowest recorded temperature was 82.6F (wall).

Calculated max heat produced per hour: 9100 BTU Calculated max cooling rating required: 0.8 ton unit

Requirement: Install new 1‐ton split‐system unit.

Equipment rack

Building 50 - 1 – Regional Training Site (RTS) Communications closet near building entry corridor

Existing conditions: Racks of equipment mounted on an interior wall, with wall vent to facilitate air movement and natural convective cooling. Highest recorded temperature was 86.0F (enclosure of equipment in rack), and lowest recorded temperature was 81.9F (back wall).

Calculated max heat produced per hour: 5875 BTU Calculated max cooling rating required: 0.5 ton unit

Requirement: AC mini‐split system rated at 0.5 ton.

Communications closet – Bdg 50 Rack of equipment inside Bdg 50 Comm Closet

Building 54 - 1 – Regional Training Site (RTS) Room labeled “Control Cab – Cadre Only”

Existing conditions: Racks of equipment mounted on an exterior wall. Highest recorded temperature was 92.5F

(enclosure of equipment in rack), and lowest recorded temperature was 81.0F (back wall).

Calculated max heat produced per hour: 5975 BTU Calculated max cooling rating required: 0.5 ton unit

Requirement: AC mini‐split system rated at 0.5 ton, removal of IT closet doors to allow air flow to/from larger room.

Communications closet – far back of room Double steel doors separate closet from rest of C2 room.

Comm closet is currently very shallow in depth

Building 75 - 1 – Regional Training Site (RTS) Office

Existing conditions: room is cooled by the main building air conditioning system (which also cools an adjacent office and restroom), and contains one cabinet mounted to an interior wall. Highest measured temperature was 85.1F (enclosure of equipment in rack) and lowest measured temperature was 79.3F (wall).

Calculated max heat produced per hour: 4100 BTU Calculated max cooling rating required: 0.3 ton unit

Requirement: Install supply duct/ceiling diffuser very close to communications cabinet.

Comm equipment cabinet – Bdg 75 Bdg 75 – Communications Equipment