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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Model C60 Integrated CHP Modes of Operation There are three basic thermal operating (CHP) modes, as summarized in the table below: Table 2. CHP Operating Modes CHP Mode Description Thermal Priority X The diverter is locked in the full heat recovery position. Electric power is automatically adjusted to control thermal output using measured water inlet, outlet or external temperature control signal. Temperature setpoint and feedback are controlled by the Master. This mode cannot be used in Stand Alone mode. If a Dual Mode unit has been set up to operate in Thermal Priority mode, it will automatically switch to Electric Priority mode when switched to Stand Alone operation, and switch back to Thermal Priority in Grid Connect mode. Electric Priority (with Thermal Tracking) X X In Grid Connect mode, electric power is controlled either as a fixed setpoint or using one of several electric load following schemes. In Stand Alone mode, the electric output is controlled by the connected load. The diverter is automatically adjusted to try to maintain the measured water inlet, outlet or external temperature control signal. Maximum available heat recovery will depend on the electric output. Thermal Bypass The diverter is locked in the full bypass position. A minimum amount of heat will still be recovered, but will not depend strongly on the electric power level. This is the default mode. XX The most stable thermal tracking is achieved when the unit is grid connected and operating in the Thermal Priority mode. This method also keeps thermal and electric outputs in proportion, thereby preserving the total system efficiency. This may be important if specific overall system efficiencies must be maintained. If electric output has higher value than thermal output, Electric Priority may be the best operating mode. When the electric power output is fixed in Grid Connect operation, the exhaust diverter will provide stable thermal tracking and will move to a stationary intermediate position when thermal loads are constant. When the MicroTurbine is set to electrically load follow in Grid Connect mode, or when operating in Stand Alone mode, it may be forced to make constant electric power output adjustments as loads change. This will result in the exhaust diverter constantly adjusting its position to try to maintain the programmed thermal output. Therefore, when operating in Electric Priority mode under these load changing conditions, thermal output control may not be as stable as when set for a fixed electric output in Grid Connect mode. The system also may not be able to provide the expected thermal output, since electric power will be determined by load changes. 480007-001 Rev D (June 2005) Page 3 of 21 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the equipment ratings, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. Grid Connect Stand AlonePDF Image | Application Guide - Model C60 Integrated CHP (ICHP)
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