Walk in Growth Chamber Specification.docx

List of Specifications for Walk in Plant Growth Chambers (2) Delivery Location

USDA ARS DKI PBARC

64 Nowelo Street Hilo, HI, 96720 Attn: Tracie Matsumoto

Contact Tracie Matsumoto 808-313-0712 Tracie.Matsumoto@usda.gov

Item Specification

· General

· Walk in growth chamber, made with material that is smooth and impervious to liquids and can be cleaned and disinfected.

· 144 sq ft of growing area that can accommodate different heights of plants from 20’ to 72”.

· Air flow in chamber should be able to be switched from controlled vertical airflow for single tier growth mode, to horizontal airflow in the multi-tier configuration.

· Air-cooled system refrigeration and specifically be designed using Ashrae 20-year extreme guidance for Hilo.

· Multiple growth chambers will be connected by vestibule/anteroom which is sealed and prevents contents from growth chamber being directly released into the building.

· External air exhaust will be passed through HEPA filter.

· Room should be secured for potential seismic activity.

· Controller

· Should be programmable on daily schedule

· Data should be able to be viewed locally at chamber and downloaded for record keeping.

· Alarms should allow for local monitoring and through internet or other system to allow for alerts.

· Lighting

· Provide lighting intensity of 1000 micromoles/m²/s in single tier configuration and 600 micromoles/m²/s in two or three tier configuration.

· Intensity should be able to be controlled for different light requirements, automatic dimming capability should be combined with specific R/FR manipulation using separate 730nm sources.

· Lights should be LED broad spectrum with supplemental far-red light.

· Lights should be monitored and available on data display.

· Temperature

· Chamber shall operate between 10°C to 35°C lights OFF, 15°C to 35°C ON with ±0.5°C at the control point.

· Provide a programmable min and max temperature or a limit tracking alarm that automatically follows the programmed set point

· Provide an independent factory-set high and low temperature limit.

· Sensors are located in a self-contained portable aspirator. This allows accurate measuring and recording by sensing at plant location.

· Adjustable fan speed.

· Humidity

· Provide additive humidity function achieving up to 70% RH lights OFF/ON, limited by a 25°C maximum dew point.

· Ensure humidity control of ±3% RH and incorporate a dry humidity sensor to directly measure humidity in %RH.

· Provide dehumidification using mechanical means to achieve a desiccation rate of 6 pounds/hour of moisture at minimum.

· Supplement Carbon Dioxide

· Provide additive C02 control including all necessary sensors, control valves, and injection system for additive CO2

· Installation

· Vendor shall include full installation of equipment and components at project site.

· Full installation and commissioning shall be completed by vendor within eight weeks of mobilizing to site.

· Warranty

· Vendor shall provide a full three-year warranty on all equipment including parts and labor.

· Preventative Maintenance: Vendor shall provide a full three-year on-site preventative maintenance program on a minimum once-annual basis.

· Chamber and components should provide a U.S. electrical inspection marking by an authority accredited by OSHA. This third-party certification shall apply to the chamber as an entire unit, fit for purpose. Incorporation of individual UL listed components, not certified as an entire unit fit for purpose, shall not be acceptable.