USA: Largest Solar Cooling System Worldwide

It is an ideal location for solar cooling use: Scottsdale, a US city in the Greater Phoenix area in Arizona enjoys an average of 312 days of sunshine every year. Between May and September, temperatures rise above 38 °C and can even reach 46 °C on a hot day. This is where in July 2011, Austrian company S.O.L.I.D has started to plan a solar cooling system for Scottsdale’s Desert Mountain High School (DMHS) of 2,600 students. Three years later, the 3.4 MWth (4,865 m² of collector area) system went into operation and is now supplying heat to a single-effect lithium bromide absorption chiller with a cooling capacity of 1,750 kW.
Photo: S.O.I.L.D

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Name of project / installation site

Desert Mountain High School (DMHS) in Scottsdale, Phoenix, Arizona



Start of operation

May 2014


Solar cooling

Gross collector field size

3.4 MWth (4,865 m2)

Storage size

34.5 m3

Number of users

2,600 high-school students

Predicted specific solar yield per year

3.9 GWh/a, corresponding to 800 kWh/m2 of collector area

Predicted solar cooling share

30% of annual cooling demand; system is designed to cover 100 % during low-load times


Heat sold to Scottsdale Unified School District (SUSD)

Planning, construction and operation

S.O.L.I.D., Austria

Collector manufacturer

Asgard Solarkollektoren (formerly Ökotech), Austria, and Arcon, Denmark


More information


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