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An adsorption Activated Carbon/Methanol air conditioning system was developed by Wang in 2001 to be powered by heat sources with temperatures close to 100 °C. Evacuated tube collectors could be used to supply hot water at this level of temperature. The system, had two adsorbers with 26 kg of carbon inside each one and used methanol as refrigerant. The COP and the SCP of this system were significantly influenced by the cycle time.