Attachment_1._SABER_Specifications_Part9.pdf

Provide stainless steel side bolts and nozzles. Provide one piece molded nitrile rubber, ethylene-propylene rubber viton, neoprene or butyl gaskets. Fabricate heat exchangers with design results of heat transfer coefficients greater than 1,000 Btu per square foot per hour per degree F.

2.8.3 Shell and Tube or Tube in Tube Construction

2.8.3.1 Double wall vented, straight tube or "U" tube as indicated. Low temperature water mixture shall pass through tubes. High temperature water mixture shall pass through shells. Fabricate tubes from 5/8 inch or 3/4 inch or stainless steel or seamless No. 20 BWG cupro-nickel (90-10).

Provide tube bundles removable through flanged openings.

2.9 SOLAR COLLECTORS

2.9.1 ASHRAE 93, ASHRAE 96, SRCC OG-100 and SRCC CSCWHSR listed or Florida Solar Energy Center (FSEC) certified; liquid flat-plate collectors. Provide factory fabricated and assembled, single glazed, double glazed or triple glazed or unglazed panels. Internal manifold collectors may be used if manufacturer standard. Include the following design features:

2.9.2 Collector Sizes

2.9.2.1 Maximum filled weight not to exceed five pounds per square foot of gross collector area.

2.9.3 Minimum Performance Parameters

2.9.3.1 Provide total collector flow rate in accordance with manufacturer's recommendations. Provide instantaneous collector efficiency as follows:

Minimum Instantaneous Collector Efficiency, Percent Inlet Fluid Parameter

74 Zero 54 0.03 40 0.05

Determine inlet fluid parameter (IFP) in accordance with the following formula:

IFP = A - B

C Where:

A = Liquid inlet temperature in collector B = Ambient air temperature C = Solar flux

2.9.4 Absorber

2.9.4.1 Fabricate of aluminum, stainless-steel, copper tubes on copper sheet or copper tubes with copper fins. Provide the absorber rated for 150 psig with working pressure of 125 psig.

2.9.5 Absorber Plate Coating

2.9.5.1 Electroplated black chrome with minimum 1/10 mil thick, flat black undercoating of nickel or baked-silicone-polyester, or equivalent surface coating. Provide coating with minimum

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Attachment 1 20 May 2014 absorptivity 0.90, maximum emissivity 0.12, and minimum breakdown temperature at 400 degrees F.

2.9.6 Collector Case

2.9.6.1 Fabricate from at least 20 gage galvanized steel ASTM B 209M (ASTM B 209) alloy or equivalent aluminum. Paint collector box with durable baked enamel. In the back of case, provide insulation with a heat transfer factor of maximum 0.1 Btu per hour per degree F per square foot. Use only insulation without out-gassing or other breakdown at or under stagnation temperature, such as rigid mineral fiber panels. Fabricate cover frame and glazing channel of galvanized sheet steel, stainless steel or extruded aluminum. Provide preformed gaskets as specified.

2.9.7 Collector Cover (Glazing Material)

2.9.7.1 ASTM C 1048, Kind FT, fully tempered glass; Condition A, uncoated surfaces; Type I, transparent glass; Class 1, clear; Quality q3, glazing select; 1/8, 3/16 or 5/32 inch float glass as indicated.

2.9.8 Collector Identification

2.9.8.1 On each collector, provide the following information:

a. Manufacturer's name or trademark

b. Model name or number

c. Certifying agency label and rating.

2.9.8.2 Other Components

a. Provide collectors for the complete removal of internal moisture which may develop in the collectors. Collector weep holes or desiccants with air vents may be used. If desiccants are used, provide 8 mesh silica gel with approximately 10,000 cycles of regeneration.

2.10 COLLECTOR SUPPORTS

2.10.1 Provide a commercial integrated structural system, supplied by a single manufacturer, consisting of formed aluminum or galvanized or plated steel channels, perforated with round or square holes, and corrosion resistant brackets, clamps, bolts and nuts.

2.11 COLLECTOR HEAT TRANSFER FLUID

2.11.1 Conform to the following:

a. Liquid useful temperature range of 400 degrees F.

b. Non-ionic, high dielectric, non-aqueous, non-reactive, stable fluid which does not corrode copper, aluminum, iron, or steel, or attack plastics.

c. Flash point exceeding 380 degrees F.

d. Fluid stability of ten years.

e. Maximum acute oral toxicity of 5000 ppm.

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Attachment 1

2.12 SOLAR-BOOSTED DOMESTIC WATER HEATERS

2.12.1 ASHRAE 90.1 - IP and UL listed. Provide built-in, double wall heat exchanger and factory insulation jacket.

2.13 INSULATION

2.13.1 Section 23 07 00 Thermal Insulation for Mechanical Systems.

2.14 INSTRUMENTATION

2.14.1 Use corrosion resistant materials for wetted parts of instruments.

2.14.2 Solar Controller

2.14.2.1 Solid-state or electrical only.

2.14.2.2 Differential Temperature Control

a. Factory assembled and packaged device.

2.14.2.3 High Limit Control

a. Provide high temperature cut-off to limit upper half of the storage tank temperature to be 180 degrees F.

2.14.2.4 Swimming Pool Control

a. Provide adjustable thermostatic setting to prevent pool overheating, with range from 56 to 85 degrees F. Turn solar heater on when solar collectors are 5 degrees F hotter than pool temperature. When pool temperature is above the thermostatic setting, drain water from the panels.

2.14.2.5 Controller Enclosure

a. Weathertight.

2.14.3 Differential Thermostat

2.14.3.1 Provide UL-listed differential thermostat for controlling the magnetic starter, not in the same circuit as pump motor. For integral collector freeze protection, provide two independent contact relays, rated ten amperes at 120 Vac. Provide a switch with ON, OFF, and AUTO positions. Provide weathertight enclosures.

2.14.4 Sensors

2.14.4.1 Construct sensors to withstand stagnation temperatures of glazed solar collectors. Provide primary and alternate collector sensors attached to an absorber plate. Provide copper or brass wells which can be inserted into the collector tube, or storage tank. Sensors may be strapped onto pipes and covered with insulation.

2.14.5 Pressure Gages

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2.14.5.1 ASME B40.100, brass body, and minimum 3 1/2 inch diameter dial face.

2.14.6 Tank Gages

2.14.6.1 FS A-A-50568; Type I, buoyant force; II, diaphragm; or III, purge, bubble-pipe.

2.14.7 Thermometers

2.14.7.1 ASTM E 1, liquid-in-glass type or dial type, liquid-filled tube and bulb. For pipe and tank applications, provide separate sockets fabricated of brass, copper, or stainless steel and rated for 125 psi working pressure.

2.14.8 Test Ports

2.14.8.1 Solid brass, 1/4 inch fitting to receive either a temperature or pressure probe 1/8 inch outside diameter, two valve cores of neoprene, fitted with color coded and marked cap with gasket, and rated for 1,000 psig.

2.14.9 Monitoring System

a. Btu Meter: Sensing and Monitoring device to measure and display the heat energy produced by the solar system, with minimum sensitivity of 0.5 percent over the entire scale. Provide electromechanical Btu counter plus digital-panel meter indicating sensor temperatures, differential temperature, flow rate, and Btu per minute or hour.

b. Water and Heat Transfer Fluid Leak Detection: UL-listed system consisting of a sensor probe, control panel, and LED indicators for water; yellow, and heat transfer fluid; red, with audible alarm at minimum 75 dB sound level; reference 10 exponential minus 12 watts.

2.15 SOLAR COLLECTOR CONTROL SEQUENCES

2.15.1 As indicated.

PART 3 EXECUTION

3.1 INSTALLATION

3.1.1 Solar Collector System

3.1.1.1 Install the solar collector system in accordance with this section and the printed instructions of the manufacturer. Disinfect domestic water systems, if connected with collector panels, in accordance with Section 22 00 00, "Plumbing, General Purpose." Prior to system start-up, protect collector from direct sunlight.

3.1.2 Piping Installation

3.1.2.1 Accurately cut pipe to measurements established on site and work into place without springing or forcing. Locate piping out of the way of windows, doors, openings, light fixtures, electrical conduit, equipment, and other piping. Provide for expansion and contraction. Do not bury, conceal, or insulate until piping has been inspected, and tested. Locate joints where they may be readily inspected. Provide flexibility in piping connected to equipment for thermal stresses

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Attachment 1 and vibration. Support and anchor piping connected to equipment to prevent strain from thermal movement and weight from being imposed on equipment. Provide seismic restraints in accordance with SMACNA Seismic Restraint Mnl. Install hangers and supports in accordance with MSS SP-69 and MSS SP-89, unless otherwise indicated.

3.1.2.2 Fittings

a. Provide long-radius ells wherever possible to reduce pressure drops. Do not bend pipes, miter pipe to form elbows, use bushings, or notch straight runs to form full-sized tees. Provide union for disconnection of valves and equipment for which a means of disconnection is not otherwise provided. Provide reducing fittings for changes of pipe size.

3.1.2.3 Measurements

a. Determine and establish measurements for piping at the job site and accurately cut pipe and tubing lengths accordingly. Where possible, install full pipe lengths. Do not use couplings to join random lengths.

3.1.2.4 Cleaning

a. Thoroughly clean interior of water piping before joining by blowing clear with either steam or compressed air. Maintain cleanliness of piping throughout installation. Provide caps or plugs on ends of cleaned piping as necessary to maintain cleanliness.

3.1.2.5 Panel Connections to Headers

a. Connect panels to top and bottom headers with soft-drawn long bend "S" or "U" copper tubes brazed with 15-percent silver solder. Provide tube bender only. Hand-formed tubing will not be acceptable. Install bottom headers behind the panels to protect the header insulation from abuse. For panels with internal headers, provide copper couplings and soldering.

3.1.2.6 Header Thermal Expansion and Contraction

a. Install slip tube or bellows type expansion joints. Limit thermal expansion of collector headers to 1/4 inch for 200 degrees F maximum rise.

3.1.2.7 Flanged Joints

a. Provide flanged joints for making flanged connections to flanged pumps and other flanged piping components. Install joints so that flanged faces bear uniformly. Engage bolts so that there is complete threading through the nuts and tighten until bolts are equally torqued.

3.1.2.8 Sleeves

a. Provide schedule 10 galvanized steel sleeves for pipe and tubing passing through floors, roofs, walls and partitions of either concrete or masonry construction, except that sleeves are not required for floor slabs on grade. After piping has been installed, pack oakum into the space between the pipe or tubing and the sleeve and seal both ends with insulating cement.

3.1.2.9 Flashing

a. Provide watertight flashing for pipe and tubing extending through the roof.

3.1.2.10 Escutcheons

a. Provide chrome plated steel escutcheons for uninsulated pipe and tubing passing through floors, 48 14 13.00 20-13

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Attachment 1 walls and ceilings.

3.1.2.11 Drain Lines

a. Provide drain lines from air vents and relief valves to the nearest roof drains, floor drains or disposal points as directed.

3.1.2.12 Insulation and Identification

a. Insulate piping in accordance with Section 23 07 00 Thermal Insulation for Mechanical Systems. Frostproof air vents by insulating or shielding from night sky reverse radiation. After piping has been insulated, apply identification labels and arrows in accordance with MIL-STD-

101. Apply identification over the insulation jacket of piping. Provide two copies of the piping identification code framed under glass and install where directed.

3.1.2.13 Excavating and Backfilling

a. Provide in accordance with Section 31 00 00 Earthwork. Coordinate provision of utility warning and identification tape with backfill operation. Provide tapes above buried lines at a depth of 8 to 12 inches below finish grade.

3.1.3 Instrumentation

3.1.3.1 Install instruments as recommended by the control manufacturers. For the monitoring system to detect water and heat transfer fluid, locate the sensor probe in the lowest corner of double-wall tank and heat exchanger. Locate control panels inside mechanical room.

3.2 FIELD QUALITY CONTROL

3.2.1 Field Inspection

3.2.1.1 Prior to initial operation, inspect the piping system for conformance to drawings, specifications and ASME B31.1. Inspect the following information on each collector:

a. Manufacturer's name or trademark

b. Model name or number

c. Certifying agency label and rating.

3.2.2 Tests

3.2.2.1 Provide equipment and apparatus required for performing tests. Correct defects disclosed by the tests and repeat tests. Conduct testing in the presence of the Contracting Officer.

3.2.2.2 Piping Test

a. Test new water piping for leakage using water at a pressure of at least 100 psig or 1.5 times the system pressure. Install a calibrated test pressure gage in the system to indicate loss in pressure occurring during the test. Apply and maintain the test pressure for one hour, during which time there shall be no evidence of leakage, as detected by a reduction in test pressure. Should a reduction occur, locate leaks, repair, and repeat the test.

3.2.2.3 Operation Tests

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a. Perform tests on mechanical systems, including pumps, controls, controlled valves, and other components in accordance with manufacturer's written recommendations. Test entire system in accordance with Section 23 05 93.00 10 Testing, Adjusting, and Balancing of HVAC Systems.

3.2.3 Manufacturer's Field Services

3.2.3.1 Furnish the services of a technical representative of the collector manufacturer, at the job site during each phase of inspection, installation, and testing. For solar collectors, furnish the services of a manufacturer's representative to instruct Government personnel for one manday, in the operating and maintenance of equipment. Notify the Contracting Officer in writing, prior to scheduling instructions.

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