36C24818R0184-022.pdf

05-11

REPLACE AIR HANDLERS 4, 35, 54, 55, 27, NAH1, NAH2, AND NAH3

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WEST PALM BEACH, FL 23 72 00-1

SECTION 23 72 00

AIR-TO-AIR ENERGY RECOVERY EQUIPMENT

PART 1 - GENERAL

1.1 DESCRIPTION

This Section specifies air to air heat pipe heat exchangers.

1.2 RELATED WORK

A. Section 01 00 00, GENERAL REQUIREMENTS: Requirements for pre-test of equipment.

B. Section 23 05 11, COMMON WORK RESULTS FOR HVAC: General mechanical requirements and items, which are common to more than one section of

Division 23.

C. Section 23 07 11, HVAC INSULATION: Requirements for piping insulation.

D. Section 23 21 13, HYDRONIC PIPING: Requirements for piping for expansion tanks.

E. Section 23 82 16, AIR COILS: Requirements for run-around system coils.

F. Section 23 31 00, HVAC DUCTS and CASINGS: Requirements for sheet metal ducts and fittings.

G. Section 23 40 00, HVAC AIR CLEANING DEVICES: Requirements for filters used before heat recovery coils.

H. Section 23 09 23, DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC: Requirements for controls and instrumentation.

I. Section 23 05 93, TESTING, ADJUSTING and BALANCING FOR HVAC:

Requirements for testing, adjusting and balancing of HVAC system.

J. Section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS: Requirements for commissioning, systems readiness checklists, and training.

K. Section 01 91 00 – GENERAL COMMISSIONING REQUIREMENTS

1.3 QUALITY ASSURANCE

A. Refer to paragraph, GUARANTEE in specification Section 00 72 00, GENERAL

CONDITIONS.

B. Refer to specification Section 01 00 00, GENERAL REQUIREMENTS for performance tests and instructions to VA personnel.

C. Refer to paragraph QUALITY ASSURANCE in specification Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

D. Performance Criteria: Heat recovery equipment shall be provided by a manufacturer who has been manufacturing such equipment and the equipment has a good track record for at least 3 years.

E. Performance Test: In accordance with PART 3.

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1.4 SUBMITTALS

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES.

B. Manufacturer's Literature and Data:

1. Heat Pipe Heat Exchanger

2. C. Certificate: Submit, simultaneously with shop drawings, an evidence of satisfactory service of the equipment on three similar installations.

D. Submit type, size, arrangement and performance details. Present application ratings in the form of tables, charts or curves.

E. Provide installation, operating and maintenance instructions, in accordance with Article, INSTRUCTIONS, in Section 01 00 00, GENERAL

REQUIREMENTS.

F. Completed System Readiness Checklists provided by the Commissioning

Agent and completed by the contractor, signed by a qualified technician and dated on the date of completion, in accordance with the requirements of Section 23 08 00 COMMISSIONING OF HVAC SYSTEMS.

1.5 APPLICABLE PUBLICATIONS

A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only.

B. Air Conditioning, Heating, and Refrigeration Institute (AHRI)

AHRI 1060-2005..........Performance Rating of Air-to-Air Heat Exchangers for Energy Recovery Ventilation Equipment

C. American Society of Heating, Refrigeration and Air Conditioning

Engineers (ASHRAE):

15-10...................Safety Standard for Refrigeration Systems (ANSI)

52.1-92.................Gravimetric and Dust-Spot Procedures for Testing

Air-Cleaning Devices Used in General Ventilation for Removing Particulate Matter

52.2-07.................Method of Testing General Ventilation Air-

Cleaning Devices for Removal Efficiency by

Particle Size

84-08...................Method of Testing Air-to-Air Heat/Energy

Exchangers

D. American Society for Testing and materials (ASTM)

D635-10.................Standard Test Method for Rate of Burning and/or

Extent and Time of Burning of Plastics in a

Horizontal Position

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E84-10..................Standard Test Method for Surface Burning

Characteristics of Building Materials

E. American Society of Civil Engineers (ASCE)

ASCE 7-10...............Minimum Design Loads for Buildings and Other

Structures

F. Underwriters Laboratories, Inc (UL)

1812-2009...............Standard for Ducted Heat Recovery Ventilators

1815-2009...............Standard for Nonducted Heat Recovery Ventilators

PART 2 - PRODUCTS

2.1 AIR-TO-AIR WRAP AROUND HEAT PIPE HEAT RECOVERY

A. Thermal recovery units shall be capable of operating at temperatures ranging from a minimum of -29 degrees C (-20 degrees F) to a maximum of

49 degrees C (120 degrees F). The heat transfer between air streams shall take place in a counterflow arrangement. The unit shall have no moving part and shall be one piece construction.

B. Tube core shall be either 18-mm (5/8 inch) or 25-mm (1 inch) OD seamless copper tubing permanently expanded into the fins to form a firm, rigid and complete metal pressure contact between the tube and fin collar of all operating conditions. For high-humidity locations, provide copper tunes and copper fins.

C. Fin: Copper

1. Fin and Tube Joint: Mechanical bond and silver brazed.

D. Coating: Thermoplastic vinyl epoxy.

E. Secondary surfaces shall be of continuous plate type aluminum fins, 0.18 mm (0.007 inch) thick, and of corrugated design to produce maximum heat transfer efficiencies.

F. Basic capillary wick shall be an integral part of the inner wall of the tube and provide a completely wetted surface for maximum heat pipe capacity with minimum heat transfer resistance.

G. Refrigerants used shall be approved by EPA.

H. Casing shall be a minimum of 1.9 mm (14-Gauge) galvanized steel flanged casing, with airtight partition between airstreams.

I. End covers shall be a minimum of 1.0 mm (20-Gauge) galvanized steel.

J. Shutoff and Stage Control Mechanism: For shutoff and multi-step heat pipe operation with electric solenoid valves; and having control panels as shown on the drawings.

K. Automatic Temperature Controls and Sequence of Operations: As shown on drawings and as specified in Section 23 09 23, DIRECT-DIGITAL CONTROL

SYSTEM FOR HVAC.

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2.2 AIR FILTERS

Air Filters: Disposable air filters, with a MERV rating of 7, shall be provided on all air entering sides of air-to-air heat exchangers, and as indicated on the drawings. Comply with requirements in specification

Section 23 40 00, HVAC AIR CLEANING DEVICES.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Follow the equipment manufacturer's instructions for handling and installation, and setting up of ductwork for makeup and exhaust air steamers for maximum efficiency.

B. Seal ductwork tightly to avoid air leakage.

C. Install units with adequate spacing and access for cleaning and maintenance of heat recovery coils as well as filters.

3.2 FIELD QUALITY CONTROL

A. Operational Test: Perform tests as per manufacturer’s written instructions for proper and safe operation of the heat recovery system.

1. After electrical circuitry has been energized, start units to confirm proper motor rotation and unit operation.

2. Adjust seals and purge.

3. Test and adjust controls and safeties.

B. Replace damaged and malfunctioning controls and equipment.

C. Set initial temperature and humidity set points. Set field-adjustable switches and circuit-breaker trip ranges as indicated.

D. Prepare test and inspection reports to the Senior Resident Engineer in accordance with specification Section 01 00 00, GENERAL REQUIREMENTS.

3.3 INSTRUCTIONS

Provide services of manufacturer's technical representative for four hours to instruct VA personnel in operation and maintenance of heat recovery equipment.

3.4 STARTUP AND TESTING

A. The Commissioning Agent will observe startup and contractor testing of selected equipment. Coordinate the startup and contractor testing schedules with the Resident Engineer and Commissioning Agent. Provide a minimum of 7 days prior notice.

3.5 COMMISSIONING

A. Provide commissioning documentation in accordance with the requirements of Section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS for all inspection, start up, and contractor testing required above and required by the

System Readiness Checklist provided by the Commissioning Agent.

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B. Components provided under this section of the specification will be tested as part of a larger system. Refer to Section 23 08 00 –

COMMISSIONING OF HVAC SYSTEMS and related sections for contractor responsibilities for system commissioning.

3.6 DEMONSTRATION AND TRAINING

A. Provide services of manufacturer’s technical representative for four hours to instruct VA personnel in operation and maintenance of units.

B. Submit training plans and instructor qualifications in accordance with the requirements of Section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS.

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