Roof Valley Controller

[Emerenciana Mcgreal]

Ihave to admit, this was a bit of a fortuitous phone call. I was traveling when I received a phone call from Lynn Barnett, a retired gutter installer and inventor from Ohio. He was calling to tell me about his new invention that replaces splash guards on roof valleys.

See splash guards are great for keeping water from spilling over at the base of a valley, but terrible for allowing leaves and debris to fall to the ground. What invariably happens is that leaves, sticks and other matter work its way down the valley and lodge behind the splash guard. This creates a damming effect, and before you know it, you have to climb your ladder to clean the debris out from behind the splash guard.

The choice until now has been to keep the splash guards in place and occasionally clean this area or remove the splash guards, which will allow leaves and debris to flow off the roof surface, but allow water to do the same, especially if you have gutter guards in place.

Since this area of the roof acts more like a river due to the convergence of two roof surfaces, the water flows down the valley at a high rate of speed. This has been a classic problem for most gutter guard manufacturers.

Nobody has ever come up with a better solution to solve this problem, until now. As it turns out, the inventor and I were both in the same town on the day of his phone call. He was visiting potential distributors throughout the southeast and I was visiting prospective clients.

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The thesis details the design, development and implementation of a proportional mixer unit tomix emulsions in longwall mining applications.The principal aim of this thesis was to reduce the maintenance costs, down-time, and loss ofproduction due to failure of the hydraulic roof support system in longwall mining. Improvedoperation can be achieved by increasing the control and reliability of the hydraulic fluidsystem.The present state of technology was reviewed in the metering and mixing systems such as:gear pumps and gear motors, venturi type, proportioning piston and metering pumps.Historical data showed that these systems could not provide a reliable and consistent output.Each of the systems were analysed to determine the operating characteristics, strengths,weaknesses and potential areas for improvements. From this analysis the venturi system waschosen as a base system for further development.The greatest weakness of the venturi system was its inability to cope with changes in theoperating conditions. To overcome this limitation a proportional controller was designed andbuilt to attach directly to a venturi mixer unit. The basis of the improvement was similar tothat used in conventional hydraulic systems for pressure compensated flow control.Laboratory test results indicated that the device would function effectively, giving consistentconcentrations of emulsions under various operating conditions. The system was installed fora period of 2 months in a colliery located in the Hunter Valley. Records of the tests were kepton a daily basis. The device was removed after the test period and examined for wear andother factors that may have influenced the perf 01mance of the controller unit.The results indicated the device functioned c01Tectly, in that it held the output concentration atthe desired level for an extended operating period A visual inspection and performance tests were undertaken after the field trials. The resultsrevealed that the device was :functioning as it was designed. There were no signs ofcomponent degradation due to excessive mechanical or corrosive wear.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science generally from 1980 onwards.

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The City of Hillsboro, Oregon, decided to renovate the Shute Park Library after an assessment identified the need to replace the entire roof, update the insulation, and replace the HVAC system. The renovation resulted in 31% annual energy savings.

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Innovating financing models and performance contracting allowed this convention center to undertake a comprehensive energy efficiency upgrade including rooftop solar, new lighting and controls, boiler and HVAC replacements, and an updated energy management system. Altogether the project saves more than $300,000 annually in energy costs.

As part of a city-wide energy audit program, the Central Library was identified for energy efficiency improvements, including conversion of existing pneumatic controls to digital control and installation of new high-efficiency chillers, variable frequency drives, and a reflective roof. These upgrades save more than $100,000 in energy costs annually.

The Orness Plaza, a 101-unit apartment building in Mankato, Minnesota, underwent a substantial renovation achieving a 25% energy reduction while improving occupant health, building durability, and water efficiency of the building's systems.

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