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United States Embassy
Abuja, Nigeria, Africa

Solar Direct Case Study

Solar Direct Case Studies

Project Background


In 2001, the United States State Department decided to relocate the Nigerian embassy to Abuja and selected the Berger Group as part of a joint venture with DMJM to take part in the design and construction of a new compound. Berger prepared civil, geotechnical, mechanical, electrical and sanitary designs, to enable self-sufficiency.

As part of the goal toward energy self-sufficiency, project managers enlisted Solar Direct to design and deliver a solar water heating system for the 5-story, 90,000 SF Chancery Building within the compound. The building’s water heating requirements are mixed-use including 190 offices, a cafeteria and five live-in apartments for visitors. Solar water heating, in reducing the use of fossil-fuel based electricity succeeded in reducing the overall system load and therefore required size of the compound’s independent power plant.

What motivated the State Department’s investment in solar water heating? Electricity is a precious resource in almost all West African countries, where black-outs are routine due to little investment and maintenance, leaving the infrastructure creaking at the seams. Nigeria, a prime example, operates at one-third of its installed capacity due to aging equipment. Nigeria has become one of the world's leading consumers for stand-by generators.

Solar Direct Case Study

Solar Direct Case Studies

System Configuration

20 ProgressivTube® (PT—50) ICS Units
One electric backup storage tank system

Collector Footprint 640 SF
System Performance 574,000 Btu/Day [168 KWH/Day]
Total Hot Water Heating Loads Max/Hr: 286 Gal/Hr
Av/Day: 1080 Gal/Day
Max/Day: 2980 Gal/Day
Water Heating Requirements Input Level: 77 deg F
Max Temp Req. 140 deg F
Solar Provision % Daily Load Daily Average Load 101 %
Daily Maximum Load 36.4%

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