Roof Top Unit Efficiency Gains

Conventional gas fired rooftop heaters often have efficiency ratings between 78 and 82 percent.

Roof top unit efficiency gains.

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. By brianna crandall april 21 2017 the u s. Determining the true of osa air using charts and. Lower peak usage supports better energy management for the facility and also lessens environmental impact.

The efficiency gains are significant. The constant innovation in rooftop unit rtu design is driven by new demands for higher energy efficiency and local regulations. 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. They are usually purchased with air conditioning units and.

Lower operating and maintenance costs. Longer equipment life than heat pump units. Central air handling units economizers and controls 8. The purpose of a rooftop unit is to distribute conditioned air within define areas of a building.

Rooftop units are connected to ductwork which provides a defined route for the conditioned air to travel along. Easily maintainable and replaceable systems. 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.

Types actuators characteristics 9. Manufacturer specific rtu economizer controls 7. 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. The second award largest efficiency gain for a multiple building rtu replacement project was presented for.

Purpose of a rooftop unit. Typical economizer controls of rooftop units that utilize honeywell controls 6. 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. 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.

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. Economizers on packaged roof top uints 5. 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. Target a previous award winner was recognized for the largest efficiency gain for a multi building rtu replacement project.

In several cases that goal was exceeded. Rooftop units provide comfort and efficiency offering.