Roof Top Unit Efficiency Gains

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Roof top unit efficiency gains.

Department of energy through the better buildings alliance s advanced rooftop unit campaign arc is recognizing eight organizations for their energy efficiency leadership in replacing and upgrading rooftop units rtus in commercial buildings. Central air handling units economizers and controls 8. Rooftop units are connected to ductwork which provides a defined route for the conditioned air to travel along. The first award largest efficiency gain for a single building rtu replacement project was presented for 60 installed efficiency gain with 41 108 tons capacity reduction achieved in a single store.

In several cases that goal was exceeded. For example a 10 ton unit required to meet an efficiency of 18 0 ieer achieved a 20 8 ieer a nearly 16 percent improvement. Economizers on packaged roof top uints 5. Lower operating costs or standards such as leed include requirements for new low gwp refrigerants and create the need for products to support these changes in rtu designs.

Types actuators characteristics 9. Increasing rooftop unit efficiency not only reduces energy use but also lowers peak usage time which is power used during the hours when the energy grid suffers the greatest strain. Units built according to the high performance rooftop unit specification were expected to reduce energy use by as much as 50 percent compared with ansi ashrae ies 90 1 requirements. Now in our last tutorial we looked at air handling units or ahu s.

The second award largest efficiency gain for a multiple building rtu replacement project was presented for. Longer equipment life than heat pump units. Easily maintainable and replaceable systems. Fast morning warm up and response times.

The purpose of a rooftop unit is to distribute conditioned air within define areas of a building. Conventional gas fired rooftop heaters often have efficiency ratings between 78 and 82 percent. They are usually purchased with air conditioning units and. Since 2013 300 partners have replaced or upgraded a total of 77 000 units saving over 166 million in energy costs and racking up 66 million in savings in 2016 alone.

Target a previous award winner was recognized for the largest efficiency gain for a multi building rtu replacement project. Purpose of a rooftop unit. Typical economizer controls of rooftop units that utilize honeywell controls 6. Lower operating and maintenance costs.

Lower peak usage supports better energy management for the facility and also lessens environmental impact. High performance rtus may have an integrated eer ieer of 17 or more. The constant innovation in rooftop unit rtu design is driven by new demands for higher energy efficiency and local regulations. Rooftop units provide comfort and efficiency offering.

Standard rtus may have an energy efficiency ratio eer of about 12 according to andrew lehrer practice leader of high performance buildings at environmental systems design inc. The efficiency gains are significant.