ATTCH 9_88127 - Basis of Design - Mechanical.pdf

Upgrade Building Complex Keaukaha ANG Station Hilo, Hawaii Hawaii Air National Guard

Type “B.1” Services Design Submittal ANG Project # MABE 152003

A4 HEATING, VENTILATING & AIR CONDITIONING (HVAC)

A4.1 Applicable Codes and Standards

UFC 1-200-01 DoD Building Code, with Change 1 UFC 1-200-02 High Performance and Sustainable Building Requirements UFC 3-400-02 Design: Engineering Weather Data UFC 3-401-01 Mechanical Engineering, with Change 1 UFC 3-410-01 Heating, Ventilating, and Air Conditioning Systems, with Change 8 UFC 3-450-01 Noise and Vibration Control UFC 4-010-01 DoD Minimum Antiterrorism Standards for Buildings, with Change 1

IBC 2018 International Building Code, 2018 Edition IECC 2015 International Energy Conservation Code, 2015 Edition IMC 2018 International Mechanical Code, 2018 Edition

ANG ETL 10-03 Air National Guard Design Objectives and Procedures ANG ETL 15-01 Air National Guard Design Policy ANG ETL 15-01-04 Mechanical Engineering

ASHRAE 62.1-2016 Ventilation for Acceptable Indoor Air Quality ASHRAE 90.1-2013 Energy Standard for Buildings Except Low-Rise Residential Buildings

10 CFR Part 436 Federal Energy Management and Planning Programs EISA 2007 Energy Independence and Security Act of 2007 EPAct 2005 Energy Policy Act of 2005 SMACNA Guidelines Sheet Metal and Air Conditioning Contractor’s National Association

A4.2 Design Conditions

The outdoor design conditions for Hilo, Hawaii:

Summer Conditions 85.0F dry bulb - UFC 3-400-02

1% Dry Bulb Occurrence 74.0F wet bulb - UFC 3-400-02

Summer Conditions 79.0F dry bulb - UFC 3-400-02 1% Humidity Ratio Occurrence 127 grains/lb - UFC 3-400-02

Condenser Ambient Design 90F dry bulb

Mean Daily Range 13.0F

Winter Conditions 63.0F dry bulb – UFC 3-400-02 99% Occurrence

Cooling Degree Days 3103 (Base 65) Heating Degree Days 22 (Base 65)

Location:

1/28/2022

Type “B.1” Services Design Submittal ANG Project # MABE 152003

N. Latitude 19.72 degrees W. Longitude 155.00 degrees Elevation 36 feet

The indoor design cooling conditions are as follows, based on UFC 3-410-01 unless indicated otherwise.

Office Areas/Classrooms: 78F dry bulb – cooling condition 50% maximum relative humidity

Conference Rooms: 78F dry bulb – cooling condition

Gym: 78F dry bulb – cooling condition

Computer/Server Room: 78F dry bulb – cooling condition

Toilets/Showers/Locker Areas: Ventilation Only

Service Rooms: Ventilation Only

Janitor’s Closets: Ventilation Only

Battery Rooms: Ventilation Only

Mechanical Rooms: Ventilation Only

Ventilation air rates in accordance with ASHRAE 62.1-2010 are as follows:

Office Areas: 5 cfm / person + 0.06 cfm / sq. ft.

Classrooms: 10 cfm / person + 0.12 cfm / sq. ft.

Conference Rooms: 5 cfm / person + 0.06 cfm / sq. ft.

Gym: 20 cfm / person + 0.18 cfm / sq. ft.

Computer/Server Room: 5 cfm / person + 0.06 cfm / sq. ft.

Toilet/Showers: 70 cfm / unit

Lockers: 0.5 cfm / sq. ft.

Service Rooms: 5 cfm / person + 0.12 cfm / sq. ft.

Janitor’s Closets: 1.00 cfm / sq. ft.

Battery Room: 2.00 cfm / sq. ft.

Mechanical Rooms: Min 4 air changes per hour or max 10F dT

Criteria for Acceptable HVAC-Related Background Sound in Rooms:

Office Areas: NC <30

Classrooms: NC <30

Conference Rooms: NC <30

Gym: NC <45

Computer/Server Room: NC <30

Toilet/Showers/Lockers: NC <30

A4.3 Building Characteristics

Wall and roof U-values shall be in accordance with ASHRAE 90.1-2010, Climate Zone 1.

Assembly Type U-Value Reference

Slab (Floor) 0.322 Table A5.2.3.1 – Concrete Only

Roof 0.063 Table A2.2.3 – Metal Deck w/ R15

Wall 0.61 Table A3.1-3 – 8” CMU (125 lb/ft3)

Fenestration 0.65 Table 5.5-1 – Climate Zone 1

SHGC-0.25

A4.4 Energy Budget Analysis

An energy analysis will be provided for the building to demonstrate compliance with the Energy Policy Act 2005 and to evaluate amount of energy cost savings.

Hawaii is located in Climate Zone 1A per ASHRAE 90.1, considered a hot and humid climate. Per ASHRAE 90.1, economizer control will not be considered for this region.

To comply with Energy Policy Act 2005, an energy model has been performed for the building to predict the amount of energy savings compared to an ASHRAE 90.1-2007 Baseline Building (neglecting plug loads in accordance with EPAct 2005 calculation method) --- see Appendix G. Predicted energy savings are 16.5% over the ASHRAE 90.1-2010 baseline (2010 baseline exceeds 2007 baselines by an average 18%). This exceeds the minimum energy saving requirement of 12% over 2010 and 30% over 2007.

A4.5 LCCA

A 40 year Life Cycle Cost Analysis (LCCA) has been performed per UFC 1-200-02. The LCCA showed that of the three systems considered for air conditioning, the most life cycle cost effective solution is to use a Variable Refrigerant Flow (VRF) System with outside air provided by a separate Dedicated Outside Air System (DOAS) at Buildings 701, 703, 704, and 705. A multi-zone ductless split system was most effective for Building 702 where outside air will be drawn in at each Fan Coil Unit (FCU). Areas that do not required conditioning will be provided with ventilation only.

Design measure have been taken to promote efficient building operation and resource consumption, including the proper control of the systems that are provided.

A4.6 General HVAC Systems

Existing HVAC systems will be demolished and replaced. The existing HVAC systems for conditioned spaces are made up of a split DX, constant volume air handler for Building 705, and approximately sixteen mini-splits for the remaining areas. New energy-efficient HVAC systems will be installed to support the current building configuration and usage requirements. The paint booth in Building 702 hasn’t been used in over 6 years and is therefore not in consideration for replacement. There were originally vehicle exhaust fans in Building 702 but they have previously been demolished and are therefore not in consideration for replacement.

Air distribution will be provided from dedicated outside air handling units, fan coils, and exhaust fans.

Conditioned air will be supplied or returned to the spaces via externally insulated metal ductwork connected to diffusers or supply grilles. Typically, exhaust air will be exhausted through uninsulated metal ductwork connected to exhaust registers or grilles.

All ductwork will be constructed of galvanized sheet metal and braced, reinforced, installed, and supported in accordance with IMC and SMACNA requirements. Round duct will be factory-fabricated “spiral” wound type ductwork. All wall openings for ductwork in secured areas were dimensioned to 96 square inches or less so manbars are not required for any openings.

Fire dampers are not required on this project.

Exhaust fan in the Battery Room will be provided with a non-sparking fan with motor located outside of the airstream.

A4.7 Special Exhaust Systems

Exhaust fan in the Battery Room will be provided with a non-sparking fan with motor located outside the airstream.

A4.8 Automatic Temperature Controls

Buildings will be provided with a DDC control system to meet base standards. One DDC will be provided for Buildings 701, 703, 704, and 705. A second DDC will be provided for Building 702. Both DDC systems will include the minimum points identified in UFC 3-410-01.

A4.9 TAB

TAB will be performed on all major equipment and distribution systems on the project as outlined in Section 23 05 93. DALT is required as part of the airside TAB for static pressure classifications 3” and above. Since ductwork at static pressure classifications 3” and above are not used on this project, DALT will not be required as part of the TAB process.

A4.10 ATFP

Construction cost percentage with respect to Plant Replacement Value (PRV) was less than 50% for this project so upgrading the building to comply with ATFP is not required.

A4.11 Seismic Design

The project likely falls within Seismic Category D. This Seismic Category requires MEP components to be provided with adequate resistance to lateral forces induced by earthquakes. Equipment within the following categories do not require protection from seismic events:

Equipment with flexible connections provided between components, is not critical to the continued operation of the structure, weighs 400 lbs or less, and has a center of mass less than 4 ft above the floor level.

Equipment that weighs 20 lbs or less or distributed systems weighing 5 lb/ft or less.