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Combining microturbines into a multipac system results in higher total system availability. And the best part is that a microCHP system pays for itself with energy savings. Figure 11 shows a sample calculation of how a hot water CHP system can result in 40% savings compared to pur- chasing power from a utility and sinking capital into a backup generator. Figure 11. – Energy Savings Comparison United Technologies Corporation (UTC) recently intro- duced a dual-effect absorption chiller – with approximately twice the energy efficiency of single-effect chillers – that is able to directly accept the exhaust from four 60-kW micro- turbines. This product was developed with support from UTC’s Carrier Corporation and the United Technologies Research Center, and is marketed through UTC Power. The first product is labeled “PureComfort 240M,” and is offered as a complete trigeneration solution – including microturbines, chiller, and pre-engineered exhaust ducting and controls. Figure 12 shows the microturbines and ex- haust ducting to the chiller during product development. UTC Power has received several orders for the PureComfort 240M, the first of which is scheduled for installation this summer. Several examples of microturbine-driven combined cool- ing and power systems are now operating, using hot water driven absorption chillers and even direct-exhaust-fired chillers. As these combined cooling and power technol- ogies continue to mature, the economic benefit will be- come viable for a significant number of commercial and industrial customers. The option to integrate backup func- tionality for these systems adds even more value for the increasing number of customers who are concerned about security of power. And since summertime load demands, and utility rates, double or triple in summer months, creating chilled water and air using heat energy instead of electric energy makes great sense. CONCLUSION Microturbines continue to find economic application in a growing market. Integration of hot water heat recovery, absorption chilling, and backup power functions makes for simple solutions that save money and increase power reliability, with the added social benefits of clean emis- sions, reduced greenhouse gas production, and more effi- cient use of our limited natural resources. The microCHP case studies in this paper are just a few examples of real commercial customers taking financial advantage of micro- turbine technology, and commercial microCCHP case studies are just around the corner. Commercial Electricity Cost Comparison $0.14 $0.12 $0.10 $0.08 $0.06 $0.04 $0.02 $0.00 -$0.02 -$0.04 40% Savings Source for Utility Tariffs: EIA 2002 Survey CA Utility Avg FuelOffset Maintenance Installation Equipment Net Fuel Utility Price CHP THE FUTURE IS EVEN MORE POWERFULL The examples shown in this paper were all microCHP systems using hot water as the thermal load. As shown in the economics above, the savings can be dramatic where hot water thermal loads exist; such as in hotels, restaurants, schools, swimming pools and spas, and many industrial processes. There is a much larger potential market for cost- effective combined cooling, heating, and power systems (sometimes referred to as CCHP) or trigeneration. Figure 12. –UTC Power’s PureComfort 240M Page 6 of 6 $/kWhPDF Image | CHP Case Studies – Saving Money and Increasing Security
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