Article 1, Hawaii Model Energy Code, is amended by adding a new section 1 to be designated and to read as follows:

Sec. 1 The Hawaii Model Energy Code, incorporated. The “Hawaii Model Energy Code, Energy Efficiency Standard for Buildings, July 1993, Prepared for: Energy Division, Department of Business, Economic Development & Tourism, State of Hawaii, Prepared by: Eley Associates, 142 Minna Street, San Francisco, California 94105,” is incorporated by reference and made a Part hereof, subject to the amendments set forth in this chapter.

(Ord. 3240 § 3 (part), 2005)

Section 2.1, Hawaii Model Energy Code, is amended to read as follows:

This Code sets forth design requirements for the efficient use of energy in new buildings and new construction in existing buildings; provided that the standards for renovated buildings shall apply only to that portion of a building being renovated and only to that section of the system or the elements in the renovated portion of the building, as further defined in this Code. This Code applies to buildings or portions of buildings that provide facilities or shelter for human occupancy including shell and speculative buildings. The requirements apply to building envelope; distribution of energy; and systems and equipment for ventilating, air conditioning, service water heating, lighting, and energy managing.

(Ord. 3240 § 3 (part), 2005)

Section 2.2, Hawaii Model Energy Code, is amended to read as follows:

This Code does not apply to:

(1) Areas of buildings intended primarily for manufacturing or for commercial or industrial processing;

(2) Buildings or separately enclosed identifiable areas having any combination of dedicated space heating, service water heating, ventilating, air conditioning and lighting systems whose combined peak design rate of nonrenewable energy usage for these purposes is less than 1.0 watt/ft ² or 3.413 Btu/h-ft ² of gross floor area. Site-generated wind, hydro or solar electric power is exempt;

(3) Buildings of fewer than 100 ft ² of gross floor area;

(4) Low-rise residential buildings as exempted under ASHRAE 90.1, except as provided in Article 14;

(5) Existing buildings that were previously permitted, inspected, and approved that are being relocated in their entirety;

(6) Any work being performed on lands that are designated by the state land use commission to be within the conservation district or are designated as Hawaiian Home Lands; and

(7) Any work being performed on behalf of any federal agency.

(Ord. 3240 § 3 (part), 2005)

Article 2, Hawaii Model Energy Code, is amended by adding a new section 2.5 to be designated and to read as follows:

The director may adopt administrative rules for the implementation, administration, and enforcement of this chapter.

(Ord. 3240 § 3 (part), 2005)

Section 3.1, Hawaii Model Energy Code, is amended by adding the following definitions to be appropriately inserted and to read as follows:

director: the director of public works and environmental management or the director’s duly authorized representative.

factory-built structure: any structure that is manufactured or fabricated at a place other than the building site.

(Ord. 3240 § 3 (part), 2005)

Section 4.4, Hawaii Model Energy Code, is amended to read as follows:

(a) Basic requirements. All building designs shall meet the requirements of Sections 5.3, 6.3, 8.3, 9.3, 10.3 and 11.3 of this Code.

(b) Prescriptive and/or system performance criteria. In addition to the basic requirements of subsection (a), either the requirements of this subsection, the Prescriptive and/or System Performance criteria, or of subsection (c), the Cost Budget Method, shall be met.

(1) The lighting design shall meet either the Prescriptive Criteria of Section 6.4 or the Systems Performance Criteria of Section 6.5;

(2) The roof of the building envelope shall meet the Prescriptive Criteria of Section 8.4. Walls may meet either the Prescriptive Criteria of Section 8.4 or the Systems Performance Criteria of Section 8.5;

(3) The heating, ventilating and air conditioning systems design shall meet the Prescriptive Criteria of Section 9.4;

(4) The service water heating systems and equipment design shall meet the prescriptive criteria of Section 11.3.; and

(c) Building energy cost budget method. The Building Energy Cost Budget Method (Article 13) may be used instead of the Prescriptive and/or System Performance Criteria of subsection (b).

(d) Plans and specifications. When plans, specifications and necessary computations must be submitted for any permit required by chapters 16.18A, 16.20A, or, 16.26, Maui County Code, those plans and specifications shall comply with this Code and shall be prepared, designed, or approved by a licensed professional engineer or architect as required by Chapter 464 of the Hawaii Revised Statutes. The responsible design professional shall seal or wet stamp the plans and first page of separate specifications and shall provide a signed statement certifying that the project is in compliance with this chapter. The signed statement shall be submitted to the director prior to issuance of any applicable permit required by charters 16.18A, 16.20A, and 16.26, Maui County Code.

(Ord. 3240 § 3 (part), 2005)

Article 4, Hawaii Model Energy Code, is amended by adding a new section 4.5 to be designated and to read as follows:

Sections 16.26.103 and 16.26.104, Maui County Code, shall apply to this chapter. Any person aggrieved by a decision of the director may appeal to the board of variances and appeals pursuant to section 19.530.030(C), Maui County Code.

(Ord. 3240 § 3 (part), 2005)

Section 5.3, Hawaii Model Energy Code, is amended to read as follows:

(a) Electrical distribution system. The design of building electrical distribution systems whose connected electric load is over 250 kVA shall include provisions for check-metering of electrical energy consumption.

(1) Electrical power feeders.

(A) The electrical power feeders for each facility for which provision for check-metering is required shall be subdivided in accordance with the following categories:

(i) Lighting and receptacle outlets;

(ii) HVAC systems and equipment;

(iii) SWH, elevators, and special-occupant equipment or systems of more than 20 kW such as computer rooms, kitchens, printing equipment, and baling presses.

(B) Exception.

10% or less of the loads on a feeder may be from another usage category.

(2) In multiple-tenant buildings, provision to permit check-metering of the tenant load shall be provided for those tenants having a connected load of 100 kVA or more. HVAC or SWH systems shared by tenants in common need not meet this tenant check-metering requirement but shall be separately metered as required.

(3) The feeders for each category in subsection (1) shall contain provisions for portable or permanent check-metering.

(4) The minimum acceptable arrangement for compliance with subsection (a) shall provide a safe method for access by qualified persons to the enclosures through which feeder conductors pass, and shall provide sufficient space to attach clamp-on or split-core current transformers. These enclosures may be separate compartments or combined spaces with electrical cabinets serving another function. Dedicated enclosures so furnished shall be identified as to measuring function available. A preferred arrangement would include kWh meters and demand registers or a means to transmit such information to the building energy management control system. These points of measurement may be centrally located or distributed through the building, as appropriate.

(b) Electrical motors.

(1) Design A & B squirrel cage, foot mounted, T-frame induction motors of 1 hp or more having synchronous speeds of 3600, 1800, 1200 and 900 rpm expected to operate more than 500 hours per year shall have a nominal full-load motor efficiency no less than that shown in Table 5-1 or shall be classified under the National Electric Manufacturers Association’s Standard as “energy efficient” [NEMA Standards Publication No. MG 1-1993, Motors and Generators, National Electrical Manufacturers Association, Washington, D.C. 20037]. Other motor types are exempted from the efficiency requirements of this standard.

(2) Exceptions.

(A) Motors used in systems designed to use more than one speed of a multi-speed motor; and

(B) Motors used as a component of the equipment meeting the minimum equipment efficiency requirements of Article 10 provided that the motor input is included when determining the equipment efficiency.

(c) Operation and maintenance information. A manual which provides basic data relating to the design, operation, and maintenance of the building electrical distribution system shall be provided to building owners by the installer of the electrical distribution system. The manual shall include:

(1) A single-line diagram of the “as-built” building electrical distribution system;

(2) Schematic diagrams of electrical control systems (other than HVAC, which are covered in Article 9 elsewhere); and

(3) Manufacturer’s operational and maintenance information for electrical equipment.

(d) Energy conservation in electrical distribution systems. The power factor of the overall electrical distribution system in a building shall be not less than 90% under the rated design installed load of the building, either by utilizing equipment design or by the use of power factor corrective devices. The selection of equipment or use of power factor corrective devices shall be based upon an engineering evaluation of each distribution system.

(e) Distribution transformers.

(1) Low-voltage dry-type distribution transformers shall meet the minimum efficiency requirements listed in Table 5-2. These transformers are air-cooled units with input voltage of 600 volts or less that typically convert a source voltage of 480/277 volts to an output of 208/120 volts.

(2) Exceptions.

(A) Transformers with rated output capacity less than 15 kVA;

(B) Drive transformers;

(C) Rectifier and converter transformers;

(D) Autotransformers;

(E) Sealed and nonventilated transformers;

(F) Welding transformers;

(G) Transformers with tap ranges greater than 10%;

(H) Testing transformers;

(I) Furnace transformers; and

(J) Instrument transformers.

(Ord. 3240 § 3 (part), 2005)

Article 5, Hawaii Model Energy Code, is amended by adding a new Table 5-2 to be designated and to read as follows:

Table 5-2 Standards for Distribution Transformers

(Ord. 3240 § 3 (part), 2005)

Table 6-1, Hawaii Model Energy Code, is deleted and adding a new Table 6-1.1 to be designated and to read as follows:

Table 6-1.1 Exterior Lighting Unit Power Allowances

(Ord. 3240 § 3 (part), 2005)

Section 6.3, Model Energy Code, is amended by amending subsection 6.3(a) to read as follows:

(a) Lighting power allowance. A building or facility total lighting allowance consists of the exterior lighting power allowance (ELPA), and the interior lighting power allowance (ILPA).

ELPA shall be calculated using the exterior lighting unit power allowances in Table 6-1.1. ILPA shall be calculated in accordance with the Prescriptive criteria in Section 6.4 or the System Performance criteria in Section 6.5.

(1) Compliance. A building shall be considered in compliance with subsection (a) if the following conditions are met:

(A) The exterior lighting power to be installed is not greater than the ELPA, based on Table 6-1.1; and

(B) The interior lighting power to be installed is not greater than the ILPA, based on either the Prescriptive criteria in Section 6.4 or the System Performance criteria in Section 6.5.

(2) Tradeoffs between ILPA and ELPA are not allowed. Tradeoffs of the interior lighting power budgets (LPB) among interior spaces (see Section 6.5) are allowed as long as the CLP of interior lighting does not exceed the ILPA. Tradeoffs of the exterior lighting power budgets among exterior areas are allowed as long as the CLP of exterior lighting does not exceed the ELPA.

(3) When determining lighting power compliance, the amount of power required for lights automatically controlled using functions such as daylight sensing control, occupancy sensor, lumen maintenance control, and programmable timing control may be reduced by a power adjustment factor (PAF) determined in accordance with subsection (c).

(4) Compliance for a multi-building facility. The total lighting power allowance for each building in a multi-building facility shall be calculated separately. Tradeoffs among the buildings shall be restricted as follows:

(A) Tradeoffs of ELPA are allowed;

(B) Tradeoffs of ILPA are not allowed; and

(C) Tradeoffs between ILPA and ELPA are not allowed.

(5) Luminaire wattage. Luminaire wattage incorporated into the installed interior lighting power shall be determined in accordance with the following criteria:

(A) The wattage of incandescent or tungsten-halogen luminaries with medium screw base sockets and not containing permanently installed ballasts shall be the maximum labeled wattage of the luminaire.

(B) The wattage of luminaries with permanently installed or remotely installed ballasts shall be the operating input wattage of the specified lamp/ballast combination used on values from manufacturers catalogs or values from independent testing laboratory reports.

(C) The wattage of a line-voltage lighting track and plug-in busway that allow the addition and/or relocation of luminaries without altering the wiring of the system shall be the specified wattage of the luminaries included in the system with a minimum of 30 watts/linear foot (98 watts/linear meter).

(D) The wattage of low-voltage lighting track, cable conductor, rail conductor, and other flexible lighting systems that allow the addition and/or relocation of luminaries without altering the wiring of the system shall be the specified wattage of the transformer supplying the system.

(E) The wattage of all other miscellaneous lighting equipment shall be the specified wattage of the lighting equipment.

(6) Exterior building grounds lighting. All exterior building grounds luminaries that operate at greater than 100 watts shall contain lamps having a minimum efficacy of 60 lumens/watt unless the luminaire is controlled by a motion sensor or the application is otherwise exempted from this code.

(Ord. 3240 § 3 (part), 2005)

Section 6.3, Hawaii Model Energy Code, is amended by adding a new subsection (e) to be designated and to read as follows:

The input rower of illuminated exit signs shall be no greater than 5 watts per face.

(Ord. 3240 § 3 (part), 2005)

Section 8.3, Hawaii Model Energy Code, is amended by adding a new subsection (g) to be designated and to read as follows:

(g) Radiant barrier eligibility. To qualify for the radiant barrier credit (RB) described in subsection (f), the installation of the radiant barrier shall meet the following criteria:

(1) The emissivity of the radiant barrier shall be less than or equal to 0.10. The manufacturer shall provide test data or documentation of the emissivity using ASTM E-408, Test Method For Total Normal Emittances of Surfaces Using Inspection Meter Techniques, ASTM Philadelphia, PA 19103.

(2) The radiant barrier shall be securely installed in a permanent manner using one of the following five installation methods.

(A) Draped with the shiny side facing down over the top cord of the truss before the roof deck is installed. A minimum air gap of 3/4 inch must be provided between the radiant barrier and the roof deck above at the center of the span. A minimum 3/4 inch air gap shall also be provided between the radiant barrier and the ceiling or insulation below.

(B) Stretched with the shiny side facing down between the top cords of the truss and stapled or otherwise secured at each side. A minimum air space of 3/4 inch above and below is required.

(C) Stapled or otherwise secured to the bottom surface of the top cord of the truss and draped below with the shiny side facing down. For attic installations only. A minimum air space of 3/4 inch above and below is required.

(D) Laid on top of the roof deck with the shiny side facing up and a minimum 3/4 inch air gap between the radiant barrier and the roofing material above. For open beam ceiling construction only. The roof slope shall be greater than or equal to 14° from horizontal.

(E) Laminated to the underside of the roof sheathing with at least 3/4 inch air space below.

(3) At least one square foot of free area for ventilation shall be provided per 150 square feet of attic floor area, or in the case of vaulted or open beam ceilings, per 150 square feet of ceiling area. In vaulted or open beam ceilings, the air space shall be vented with vent area approximately evenly distributed between the top and the bottom. In vaulted ceilings, vents shall be provided for each air space between rafters.

(Ord. 3240 § 3 (part), 2005)

Section 8.4, Hawaii Model Energy Code, is amended by amending subsection (c) to read as follows:

(c) Vertical glazing.

(1) The Relative Solar Heat Gain (RSHG) of vertical fenestration, as defined in subsection 8.3(d), shall be less than or equal to the appropriate value in Table 8-5 for low-rise buildings and Table 8-6 for all others. The maximum RSHG for north orientations shall be based on the window-to-wall ratio (WWR) for north-facing walls. The maximum RSHG for all other orientations shall be based on the combined WWR for east, west and south walls. Linear interpolation may be used to determine the maximum allowed RSHG for WWR’s which lie within one of the ranges.

(2) Exceptions.

(A) A window area of up to 2% of gross exterior wall area may exceed the RSHG limits for any given orientation;

(B) Low-rise residential buildings which are not air-conditioned are exempt from the RSHG limits;

(C) Individual windows completely shaded from the sun are exempt from the RSHG limits and shall be excluded from the window area calculation;

(D) Individual windows may exceed the maximum RSHG limit as long as the area-weighted average RSHG’s for both the north orientation and the combined east, west and south orientations are less than or equal to the maximum limit.

(Ord. 3240 § 3 (part), 2005)

Section 9.3, Hawaii Model Energy Code, is amended by amending subsection (a) to read as follows:

(a) Load calculations.

(1) Calculation Procedures.

(A) Cooling system design loads for the purpose of sizing systems and equipment shall be determined in accordance with the procedures described in the ASHRAE Handbook, 1989 Fundamentals or a similar computation procedure. For those design parameters addressed in (2) through (9), the values specified shall be used.

(B) Exceptions.

(i) Design load calculations are not required to be submitted for new, individually permitted, cooling systems of less than 65,000 Btu per hour capacity that provide less than 37 Btu per hour of installed capacity per square foot of conditioned floor area.

(ii) Design load calculations are not required to be submitted when existing cooling equipment is replaced with equipment of equal or less capacity.

(2) Indoor Design Conditions. Indoor design temperature and humidity conditions for general comfort applications shall be in accordance with the comfort criteria established in ANSI/ASHRAE Standard 55-1981 Thermal Environmental Conditions for Human Occupancy, or Chapter 8 of the ASHRAE Handbook, 1989 Fundamentals, or both, except that winter humidification and summer dehumidification are not required.

(3) Outdoor Design Conditions. Outdoor design conditions shall be selected from “Climatic Data for Region X Arizona, California, Hawaii, Nevada”, Golden Gate and Southern California Chapters, ASHRAE, Fifth Edition, May 1982, or from data obtained from the National Climatic Center or a similar recognized weather data source. Cooling design temperatures shall be no greater than the 0.5% annualized value.

(4) Ventilation. Outdoor air ventilation loads shall be based on ventilation rates specified in subsection 9.3(f).

(5) Envelope. Envelope cooling loads shall be based on envelope characteristics, such as thermal conductance, shading coefficient, and air leakage, consistent with the values used to demonstrate compliance with Article 8.

(6) Lighting. Lighting loads shall be based on actual design lighting levels or power budgets consistent with Article 6.

(7) Other Loads. Other HVAC system loads, such as those due to people and equipment, shall he based on design data compiled from one or more of the following sources:

(A) Actual information based on the intended use of the building;

(B) Published data from manufacturers’ technical publications;

(C) Technical society publications such as the ASHRAE Handbooks, 1991 HVAC Applications and 1992 HVAC Systems and Equipment;

(D) Alereza, “Estimates of recommended heat gains due to commercial appliances and equipment”, ASHRAE Transactions, Vol. 90, Pt. 2A, pp. 25--58, 1984.

(E) Default values to be used in determining the design energy budget in Article 13 are taken from Tables 13-2, 13-3, 13-3A, 13-4 and 13-6;

(F) Other data based on designer’s experience of loads and occupancy patterns.

(8) Safety Factor. Design loads may, at the designer’s option, be increased by as much as 10% to account for unexpected loads or changes in space usage.

(9) Pick-up Loads. Transient loads such as cool-down loads which occur after off-hour setback or shutoff, may be calculated from basic principles, based on the heat capacity of the building and its contents, the level of setback, and desired recovery time, or may be assumed to be up to 10% of the steady-state cooling design loads. The steady-state load may include a safety factor in accordance with subsection (8).

(Ord. 3240 § 3 (part), 2005)

Section 9.3, Hawaii Model Energy Code, is amended by amending subsection (i) to read as follows:

(i) Completion requirements.

(1) Operating and maintenance manual. An operating and maintenance manual shall be provided to the building owner. The manual shall include basic data relating to the operation and maintenance of HVAC systems and equipment. Required routine maintenance actions shall be clearly identified. Where applicable, HVAC control information such as diagrams, schematics, control sequence descriptions, and maintenance and calibration information shall be included.

(2) Air system balancing.

(A) Air system balancing shall be accomplished in a manner to first minimize throttling losses, then fan speed shall be adjusted to meet design flow conditions. Balancing procedures shall be in accordance with those established by the National Environmental Balancing Bureau (NEBB) Procedural Standards (1983) , the Association of Air Balancing Council (AABC) National Standards (1982), or equivalent procedures.

(B) Exception.

Damper throttling may be used for air system balancing with fan motors of 1 hp or less, or if throttling results in no greater than 1/3 hp fan horsepower draw above that required if the fan speed were adjusted.

(3) Hydronic system balancing.

(A) Hydronic system balancing shall be accomplished in a manner to first minimize throttling losses, then the pump impeller shall be trimmed or pump speed shall be adjusted to meet flow conditions.

(B) Exceptions.

Valve throttling may be used for hydronic system balancing under any of the following conditions:

(i) Pumps with pump motors of 10 hp or less;

(ii) If throttling results in no greater than three (3) pump horsepower draw above that required if the impeller were trimmed;

(iii) To reserve additional pump pressure capability in open-circuit piping systems subject to fouling. Valve throttling pressure drop shall not exceed that expected for future fouling;

(iv) Where it can be shown that throttling will not increase overall building energy costs.

(Ord. 3240 § 3 (part), 2005)

Section 9.3, Hawaii Model Energy Code, is amended by adding a new subsection (k) to be designated and to read as follows:

(k) System commissioning.

(1) HVAC control systems shall be tested to ensure that control elements are calibrated, adjusted, and in proper working condition.

(2) For projects larger than 50,000 square feet (4,600 square meters) of conditioned area, detailed instructions for commissioning HVAC systems shall be provided by the designer in plans and specifications.

(Ord. 3240 § 3 (part), 2005)

Section 9.4, Hawaii Model Energy Code, is amended by adding a new subsection (f) to be designated and to read as follows:

(f) Kitchen hoods.

(1) Individual kitchen exhaust hoods larger than 5,000 cubic feet/minute (2,500 liters/second) shall be provided with make-up air sized for at least 50% of exhaust air volume that is uncooled or cooled without the use of mechanical cooling.

(2) Exceptions:

(A) Where hoods are used to exhaust ventilation air which would otherwise exfiltrate or be exhausted by other fan systems.

(B) Certified grease extractor hoods that require a face velocity no greater than 60 feet/minute (18 meters/second).

(Ord. 3240 § 3 (part), 2005)

Section 10.3, Hawaii Model Energy Code, is deleted and adding a new section 10.3.1 to be designated and to read as follows:

(a) Mechanical equipment efficiency.

(1) Equipment shown in ASHRAE Tables 6.2.1A through 6.2.1G shall have a minimum performance at the specified rating conditions when tested in accordance with the specified test procedure. Omission of minimum performance requirements for equipment not listed in ASHRAE Tables 6.2.1A through 6.2.1G does not preclude use of such equipment. Equipment not listed in ASHRAE Tables 6.2.1A through 6.2.1G shall have no minimum performance requirements. Where multiple rating conditions or performance requirements are provided, the equipment shall satisfy all requirements, unless otherwise exempted by footnotes in the table. However, equipment covered under the Federal Energy Policy Act of 1992 (EPACT) shall have no minimum efficiency requirements for operation at minimum capacity or other than standard rating conditions. Equipment used to provide water heating functions as part of a combination system shall satisfy all stated requirements for the appropriate space heating or cooling category.

(2) If a certification program exists for a product covered in ASHRAE Tables 6.2.1A through 6.2.1G, and it includes provisions for verification and challenge of equipment efficiency ratings, the product shall be either listed in the certification program or, alternatively, the ratings shall be verified by an independent laboratory test report. If no certification program exists for a product covered in ASHRAE Tables 6.2.1A through 6.2.1G, the equipment efficiency ratings shall be supported by data furnished by the manufacturer. Where components such as indoor or outdoor coils from different manufacturers are used, the system designer shall specify component efficiencies whose combined efficiency meets the minimum equipment efficiency requirements in this article.

(3) ASHRAE Tables 6.2.1A through 6.2.1G set forth the minimum efficiency requirements for equipment covered by this section. The tables are organized to cover the following types of equipment:

(4) Gas-fired and oil-fired forced air furnaces with input ratings greater than or equal to 225,000 Btu/hour (65 kilowatts) shall also have an intermittent ignition or interrupted device (IID), and have either power venting or a flue damper. A vent damper shall be an acceptable alternative to a flue damper for furnaces where combustion air is drawn from the conditioned space. All furnaces with input ratings greater than or equal to 225,000 Btu/hour (65 kilowatts), including electric furnaces, that are not located within the conditioned space shall have jacket losses not exceeding 0.75% of the input rating.

(5) Exceptions:

(A) Water-cooled centrifugal water-chilling packages that are not designed for operation at ARI standard 550 test conditions (and thus cannot be tested to meet the requirements of ASHRAE Table 6.2.1C) of 44°F leaving chilled water temperature and 85°F entering condenser water temperature shall have a minimum full load coefficient of performance and IPLV rating as shown in ASHRAE Tables 6.2.1H through 6.2.1J. The table values are only applicable over the following full load design temperature ranges:

(B) Chillers designed to operate outside of these ranges are not covered by this standard.

(b) Maintenance, Operation and maintenance information shall be provided with the equipment by the equipment supplier.

(Ord. 3240 § 3 (part), 2005)

Tables 10-1, 10-2, 10-3, 10-4a, 10-4b, 10-6, and 10-7, Hawaii Model Energy Code, are deleted and adding a new section 10.4 to be designated and to read as follows:

ASHRAE Standard 90.1-1999, Tables 6.2.1A, 6.2.1B, 6.2.1C, 6.2.1D, 6.2.1E, 6.2.1F, 6.2.1G, 6.2.1H, 6.2.1I and 6.2.1J are incorporated herein by reference and amended by deleting column titled “Minimum Efficiency” and changing the column heading “Efficiency as of 10/29/01” to read “Minimum Efficiency.”

(Ord. 3240 § 3 (part), 2005)

Section 11.3, Hawaii Model Energy Code, is amended by adding a new subsection (k) to be designated and to read as follows:

(k) Heat traps.

Vertical pipe risers serving storage water heaters and storage tanks not having integral heat traps and serving a nonrecirculating system shall have heat traps on both the inlet and outlet piping as close as practicable to the storage tank. A heat trap is a means to counteract the natural convection of heated water in a vertical pipe run. The means is either a device specifically designed for the purpose or an arrangement of tubing that forms a loop of 360° or piping that from the point of connection to the water heater (inlet or outlet) includes a length of piping directed downwards before connection to the vertical piping of the supply water or hot water distribution system, as applicable.

(Ord. 3240 § 3 (part), 2005)

The Hawaii Model Energy Code is amended by adding a new Article 14 to be designated and to read as follows:

ARTICLE 14. LOW-RISE RESIDENTIAL ROOF HEAT GAIN REQUIREMENTS

(a) Notwithstanding Section 2.1, the requirements of this article shall apply to new low-rise residential buildings and new construction in existing low-rise residential buildings consisting of enclosed, habitable additions where the additions are 100 square feet or larger.

(b) “Roofs” shall mean the same as is defined in Section 3.1.

(a) The opaque portions of roof assemblies shall include at least one of the following:

(1) R-19 insulation between roof or ceiling framing members;

(2) Two inches of foam board insulation;

(3) A radiant barrier, as provided in subsection (d) and ventilation as provided in subsection (c);

(4) A cool roof as provided in subsection (e) and a radiant barrier as provided in subsection (d); or

(5) Any construction that meets the opaque roof heat gain requirements of Section 8.4(a).

(b) Plans shall indicate insulation type, thickness, and location; ventilation opening types, sizes and locations; radiant barrier location; and roof surface type as appropriate, depending on the compliance option selected from subsection (a).

(c) Additional ventilation of the space containing a radiant barrier for compliance with subsection (a)(3) shall be provided by at least one of the following:

(1) A baffled ridge vent installed in accordance with the manufacturer’s instructions in addition to lower inlet openings to provide a total of no less than 1 square foot of net free vent area for each 300 square feet of roof area. No less than 30% of the total vent area shall be in either the ridge vent or the lower half of the ventilated space.

(2) A solar-powered exhaust fan that provides at least 1 cubic foot per minute of airflow for each square foot of roof area.

(3) Upper and lower vents with total net free vent area of at least 1 square foot for each 150 square feet of roof area. At least 30% of the total vent area shall be in the upper half of the ventilated space and at least 30% of the total vent area shall be in the lower half of the ventilated space.

(d) A radiant barrier used for compliance with subsections (a)(3) or (a)(4) shall have an emissivity of no greater than 0.05 as tested per ASTM E-408, Test Method for Total Normal Emittances of Surfaces Using Inspection Meter Techniques (manufacturer’s test results are acceptable). The radiant barrier shall be installed with the shiny side facing down and with a minimum air gap thickness of 3/4 inch below. The radiant barrier may be securely attached to the roof framing or may be laminated to the bottom of the roof sheathing. A radiant barrier is a sheet of material with a low emissivity on at least one side that is used to reduce radiant heat transfer. Radiant barriers typically have a shiny metallic appearance.

(e) A cool roof for purposes of compliance with subsection (a)(4) shall have a total solar reflectance when tested according to ASTM E-903 of no less than 0.70. The infrared emittance using ASTM E-408 shall be no less than 0.75. The manufacturer’s test results shall be acceptable for compliance. A cool roof has both a light color (high solar reflectance) and a high emittance (can reflect heat back to the environment). White painted surfaces and other smooth white coatings typically meet these requirements. Surfaces that do not meet the requirements include unpainted metal and most metalized roof coatings (silver appearance).

(f) At building sites higher than a 2,400-foot elevation, only subsections (a)(1) or (a)(2) shall be acceptable for compliance.

(g) For the purpose of this section, “net free vent area” means the total area through which air can pass in a screen, grille face or register.

(h) For the purpose of this section, “roof area” means attic floor area; or, if there is no attic, “roof area” means the horizontal projection of roof area measured from the outside surface of the exterior walls.

(Ord. 3240 § 3 (part), 2005)