Posted on November 29, 2013
Located at Aiea, in the city and county of Honolulu, on the island of Oahu, Halawa Correctional is the largest prison facility in the state of Hawaii's prison system.
Operated by the Hawaii Department of Public Safety, Halawa Correctional houses approximately 1,500 inmates in two separate facilities - a special-needs facility and a medium-security facility. The main laundry serves the prison system's population with the throughput capacity to produce two million pounds of laundry per year.
The facility was searching for technology that would limit water consumption yet maximize washroom capacity within the boundaries of the existing space limitations at Halawa Correctional. EDRO was able to partner with a utility consultant and combine its ozone-powered washer-extractors with a water treatment system to reuse wash water and limit sewer discharge.
To maximize wash capacity per square foot, EDRO utilized its "ER" washer-extractor option. The "ER" variant reverses the positioning of electrical components and mirrors door-swing operation. This allows the placement of equipment adjacent to structures that would impede normal machine operation. By utilizing this option, the facility increased its washer throughput capacity by 50% in the same space.
Taking six months of work from start to finish, the installation was a main laundry upgrade project. Project included site design, removal of existing machinery, upgrade drain pit and foundation, and installation of new machines with upgrading of utility resources.
EDRO manufactured and supplied 1 x DW300SM-DOS a three hundred pound end loading washer-extractor, 1 x DW300SMER-DOS a three hundred pound end loading washer-extractor with "ER" option, and 1 x CSL110 a one hundred ten pound open pocket soft mount washer-extractor.
The new DynaWash® washer-extractors were fitted with inverters and single motor drives; an upgrade to the older multi-motor drive setup of the facility's existing machines. The inverter technology greatly reduced peak electrical load demand. Inverter with single motor drive technology is a tremendous advance in machine speed control. This motor design has significantly fewer parts than a conventional multiple motor set-up with single speed motors, clutches and gearboxes, while delivering more speed selections and greater energy efficiency.
Coupled with the programmability of the HMi/PLC, EDRO's washer-extractors are able to deliver exacting cylinder RPMs for the best wash results from wash speeds through high extract. Multiple parameter settings allow high torque wash speeds with steep slope starts and stops and elongated slopes for even load distribution and acceleration to high extract. The High Slip Braking feature allows for braking torque in excess of 100% of full load motor torque by controlling the deceleration from high speed to make the motor operate as a very efficient induction generator. The advantage of this method is that no additional parts are required to stop the machine.
Through the energy consultant, the customer was able to apply for utility rebates to assist in the funding for the new washers with these new energy-saving technologies. EDRO also designed the wash aisle layout, oversaw machine installation, and provided startup and training of the washers.
The client benefits from this project include:
► Increased wash capacity from the same machinery foot print
► Lowered waste water discharge into the State of Hawaii public sewer system
► Better utility utilization of water savings and electrical consumption
For this project, EDRO partnered with US Joiner, LLC and Noresco for installation and consultation.