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going to be used for heating the Milgro greenhouses, but only reached a temperature of 102°C (215°F) when it was initially drilled in 1999. Since this well was drilled, measured temperatures were as high as 117.5°C (244°F). In well MN-6, the highest recorded temperature was 115°C (239°F); 117°C (243°F) in well MN-7. The measurements in each of these wells changed very little over the timeframe in which they were taken. From this and other nonpublic information, it is believed that the Newcastle geothermal system can produce fluid at 115.6°C (240°F) at a rate of 1,800 gallons per minute. See Appendix A for well maps, temperature-depth charts and heat flow map. The Milgro owner’s primary concern is to maintain the resource for use in heating the greenhouses and power production is seen as a secondary benefit. During the winter when there is the greatest demand for heating the greenhouses, water enters the greenhouses at nominally 82.2°C (180°F) and exits at 60°C (140°F) at a rate of 1,500 gallons per minute. Using an average density of 977 kg/m3 and heat capacity of 4.19 kJ/kg·K, the heat demand of the greenhouses is determined to be 8.6 MWth. When the geothermal-solar thermal power plant is in operation, the rate will be higher at 1,800 gallons per minute, with a temperature drop in the geothermal water from 115.6°C (240°F) down to 65.5°C (150°F) within the power plant. Then, 8.6 MWth of heat will be extracted from the water to heat the greenhouse resulting in a reduction in temperature to 47°C (117°F). Operating in this manner, since the geothermal water will provide 23 MWth to the power cycle and 8.6 MWth to the greenhouses both the hybrid power plant and the greenhouses will function sustainably. 41PDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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