Trigeneration or trigen is the simultaneous production of mechanical power (often converted to electricity), heat and cooling from a single heat source such as fuel or solar energy. As with cogeneration, the "waste heat" byproduct that results from power generation is harnessed, thus increasing the overall efficiency of the system. Usually space heating and hot water storage tanks serve as a heat sink for reasonable waste heat utilization. In summer, the heat demand is much lower but the heat of… (More on Trigeneration)