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This study investigated the effects of pipe network materials and distance on system performance utilizing unused energy sources in large-scale horticulture facility. For this, the modeling was performed with a 100 m long and 100 m wide rectangular shaped glass house having an area of 1ha (10,000m) using EnergyPlus software. The heat sources considered were air source, geothermal heat, power plant waste heat, sea water heat, and river water. The temperature variation of the fluid with regard to pipe material and distance from the heat source and the resultant heat pump electricity consumptions were calculated. It turned out that the fluid temperature reaching the heat pump increased as the distance from the heat source increased in case of sea water and river water, which have higher temperatures than the surrounding soil, improving the heat pump efficiency. It was vice versa in case of the power plant waste heat. In addition, pipe material of PVC showed the smallest effect on the system performance variation due to the lowest thermal conductivity, compared to PB and HDPE. c 2014 KIEAE Journal  ,  , ,  ,  Unused energy sources, Piping parameters, Pipe network, Large-scale horticulture facility, EnergyPlus A C C E P TA N C E IN F O Received July 15, 2014 Final revision received August 14, 2014 Accepted August 18, 2014             120 KIEAE Journal, Vol. 14, No. 4, Aug. 2014 ,       .  Moon           80%     ,    .  Hyun , ,  ,                        .     ·              .              ,      .                         ,       .

Effects of Pipe Network Materials and Distance on Unused Energy Source System Performance for Large-scale Horticulture Facilities