A CSHPSS (central solar heating plant with seasonal storage), which is under construction in Korea, is simulated with TRNSYS 14.2 to predict thermal performances and economic merits. The system is located in Cheju Island, a far southern part of Korea, and consists of two arrays of collectors, a medium-sized storage tank, and 2 thermal loads. The loads are an office building and a greenhouse for agricultural research. Simulation results clearly reveal that Cheju Island is climatically best suited for solar heating in Korea showing 70 to 100% more solar fractions than other inland areas. The main reason for the better thermal performance for Cheju is its warmer winter climate. The system under construction is a small-sized and has 184 m2 collector area (A) and 600m3 of storage volume (V). TRNSYS prediction for the system is that about 39% of the total heating load of 897,000 MJ/year can be provided from the sun. The estimated ROIs (return of investment) range from 25 to 30 years. The validity of the design is checked through a what-if test around the design point of A-184m2 and V-600m3. Also calculated a re the solar fraction contour and the virtual solar self-sufficiency conditions. Even though the actual system is not economically viable with that small size, the authors expect that only if system sized is sufficiently large, low-cost CSHPSS systems could be constructed in Korea
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