According to Table 6 the underground water is not suitable for irrigating crops [20]. The underground compositions may affect the devices, such as heat exchangers, which may cause a corrosion, so proper material should be used for manufacturing the radiators for large scale projects. Underground water test Water composition Water inlet to the radiator Water conductivity (ms/cm) 3.95 TDS (mg/L) 1975 PH 7.68 Where TDS (mg/L)=0.5x1000xEC (mS/cm) Table 6: Underground water analysis. Greenhouse cooled by underground water as working fluid was constructed. The system is controlled using active control system that adjust itself based on the greenhouse temperature for cooling and soil moisture for irrigation. Conclusion 178
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