B08_Solicitation_-_Specifications.pdf

Sleeping Bear Dunes

National Lake Shore, Michigan

Plant Greenhouse Supply and Delivery

PMIS # 325950B

NATIONAL PARK SERVICE

06/16/2023

Sleeping Bear Dunes National Lake Shore

Plant Greenhouse

SUMMARY:

Background: The Natural Resources staff is routinely unable to find locally genetic stock of native plants to aid in restoration of disturbed areas. Constructing a greenhouse facility will allow for collection and propagation of native seeds from within the NPS boundaries.

Deliverables:

Contractor will only supply and deliver. The total quoted cost will reflect supply and delivery of the Greenhouse structure, glazing, fixtures, accessories, and detailed instructions for construction and operation. Clearly indicate greenhouse dimensions, materials, components, fasteners, doors, hardware, equipment, supplementary support or bracing, and controls. For greenhouses indicated to comply with design loads, include structural analysis data and shop drawings signed and sealed by qualified professional engineer responsible for their preparation.

Deliver materials to:

Sleeping Bear Dunes

12447 Wisniewski Rd.

Empire, Michigan 49630

Materials are to be delivered complete within 180 days after effective date of award

SPECIFICATIONS:

1 STRUCTURE

1.1 Design:

A. Wind Load – 85 mph at minimum B. Snow Load – 30 lbs. per sq. ft. ground snow at minimum

1.2 Size and Shape:

A. 800 sq. ft. floor space.

B. Sidewalls approximately 6’ tall C. Even-span; welded scissor truss design D. Sufficient roof pitch for anticipated snow loads

1.3 ALUMINUM FRAME

A. Extruded powder coated 6061-T6 and 6063-T6 alloys for entire frame. Special care shall be taken in the fabrication of this aluminum work, and all tolerances shall be held to an absolute minimum in order to secure proper fit of the aluminum members specified.

B. Aluminum columns shall be furnished to be placed through the length of the green house and across all partitions and gables as required. Columns shall be punched or drilled to attach required aluminum members.

C. Aluminum rafters shall be furnished to be placed in the roof of the greenhouse, extending from the eave or gutter to the ridge. If ridge vents are provided, rafter extends from the eave or gutter to the vent header.

D. Aluminum purlins in the roof, of the size required shall be furnished and connected to supporting members. Purlins shall be prefabricated before shipment for the attachment of glazing bars.

E. All structural members and glazing bars/mullions will be supplied with fasteners to be affixed to each other using SS fasteners appropriately sized.

F. Structural fixtures for mounting Modine style gas heater appropriately sized for greenhouse volume after-market to be operated by environmental control system.

G. Provide all other structural members, bracing, clips, and fasteners not mentioned above but required to complete the framework of the greenhouse.

1.4 RIDGE

A. An extruded aluminum ridge shall be furnished to be placed at the peak of the structure.

1.5 GABLE ENDRAFTER

A. Specially extruded gable and corner trim shall be provided to receive roof glazing bar, vertical side and gable glazing and glazing bars. The gable and corner trim shall be neatly mitered and spliced at the ridge to provide a smooth detail at this point.

1.6 WALL AND VENT SILLS

A. Extruded aluminum sills shall be provided where required. Sills shall be capable of receiving side vents or fixed glazing. Sill corners shall be shop welded.

1.7 GLAZING BARS

A. Extruded aluminum glazing bars. System to include aluminum bar caps with santoprene gaskets or equivalent. Caps shall be designed to exert a uniform, but not excessive pressure on the entire length of the glazing panel. Bar caps shall be held in place with stainless steel hex head screws with stainless steel bonded washer.

1.8 RIDGE & SIDE WALL VENTS

A. Provide independent continuous double ridge & side wall vents.

B. All vents shall operate with rack & pinion arms on 1.315" diameter galvanized steel drive shaft.

C. Shaft hangers with self-lubricating sinter-bronze bearing shall be provided to support vent drive shafts.

D. Racks to be attached to bottom rail of vents with aluminum clips and stainless-steel bolt or cotter pins. No less than two sets of rack and pinion arms shall be provided for each bay per run of vents.

E. Drive motors: Lock EWA-10 120v/1ph operated but environmental control system.

1.9 GLAZING

A. UV protected double or triple-wall polycarbonate panels with light transmission of at least 80% and R-value of at least 1.5. Full 47 1/4" wide panels to be used wherever possible.

1.10 VENT SCREENS

A. Provide 6/18 mesh aluminum insect screens set in aluminum frames for all vent openings.

Passage of vent arms through screens to be sealed by brushes that are compatible with conditions found in a greenhouse environment.

2 ENVIRONMENTAL CONTROL SYSTEM

A. Provide environmental controller equal to Wadsworth SEED controller.

B. Provide a greenhouse controller and a prewired NEMA contactor cabinet for control of heating, ventilation, and cooling systems. The contactor panel shall contain relays and/or magnetic contactors for control of the equipment.

C. Operations: All aspects of the environmental control system will be able to be programmed and operated locally from individual control panels as complete stand-alone units without the need of the main computer, including:

1. Greenhouse passive cooling: Operation of greenhouse roof vents by means of timed pulsing drive open, drive close in incremental stages. Adjustable delays, differentials, and separations. Day, midday, evening and night set points. Adjustable temperature ramp times.

2. Active Greenhouse Cooling: Programmable stages of maintained cooling to operate fans, evaporative cooling, and other connected cooling equipment.

3. Greenhouse Heating: appropriate control panel capable of performing programmable stages of maintained heating to operate hot water heating system. Solar influence of set points to raise and lower temperatures automatically based on solar levels.

4. Greenhouse Shading Operations: Programmable stages of open/close based on time of day and/or temperature.

5. Greenhouse Crop Lighting: By means of solar radiation and/or time of day with adjustable delays, differentials, and separations.

6. Greenhouse Alarm Functions: By means of adjustable set points for all connected sensors.

7. Data Collections Ability to collect and monitor data for each compartment individually using Microsoft Windows based software.

2.2 POWERED VENTILATION SYSTEM

A. Synchronized exhaust fan and intake shutters opposite each other above end doors operated by environmental control system thermostat. Fans large enough to complete full air replacement in 1 minute for volume of greenhouse. Covered with indicated insect screen.

B. Two internal circulating fans sized appropriately for greenhouse footprint operated by controller unit.

2.3 IRRIGATION SYSTEM

A. Overhead misting irrigation system with 3 separate zones operated by environmental control system.

2.4 RETRACTABLE SHADE/HEAT RETENTION CURTAIN SYSTEM

A. General:

1. Independently motorized Shading, Cooling and Heat Retention Curtain System(s) designed for 3 separate zones covering greenhouse growing area.

2. Curtains are to travel simultaneously from truss to truss and have a peaked or "roofline" profile with a flat top.

3. Curtains are to be suspended from hooks which slide on stainless steel wires.

B. All curtains are sewn to size with suspension hooks factory installed. Fabric is fire retardant with 70% shade factor in zone 1 and 50% shade factor in zone 2 and 30% shade factor in zone 3

C. Motors and Controls:

1. Systems to be independently operated by drive motor Lock EWA-10 120v/1ph.

2. Primary and backup limit switches for each travel direction are to be integrally mounted into the motor.

3. Control panel is to be prewired for computer hookup, equipped with a manual override switch.

D. Drive System:

1. Drive cables to be stainless steel.

2. Drive cables are to be of a continuous length without any splices.

3. Driveline is to contain one driveline drum per drive cable which provides simple adjustment if required.

E. System Hardware:

1. All rotating components, i.e. bearing brackets and pulleys are to utilize pre-greased double sealed ball bearings.

2. All hardware is to be corrosion protected by either galvanizing or plating.

F. System Sealing:

1. Proper sealing of the curtain system at the trusses is to be accomplished using truss mounted aluminum extrusions. Also fixed seal cloth must be able to affix around shade panel edges to provide positive seal and “Heat Retention” properties.