third-level menu. Use the (+) or (-) buttons to select Enable, then press the ACCEPT button.
iCHP Operation
The iCHP system has three modes of operation. These are:
• Thermal Bypass (default)
• Electrical Priority
• Thermal Priority
Thermal Bypass – In this mode, the exhaust diverter is locked in the fully bypass position, and the MicroTurbine can operate with a minimum water supply flow. The water flow must be able to absorb 3kW of thermal energy transferred from exhaust. This mode may be used when thermal demand is extremely low compared with the electrical load. All normal MicroTurbine control modes are supported.
Electrical Priority – In this mode, electrical power output is set to the desired level, and water temperature is set to a fixed temperature setpoint – allowing independent electrical and thermal operation. Efficiency will vary depending on both electrical and heat load requirements. Electrical Priority can be used in either Grid Connect or Stand Alone modes of operation.
In Grid Connect, the MicroTurbine is set to a fixed electrical output (in most cases, the maximum output), and water temperature is set to a fixed setpoint. During operation, the diverter adjusts exhaust flow through the heat exchanger to maintain water temperature. System efficiency will drop as exhaust is bypassed to maintain water temperature. This mode is typically used when either a fixed or maximum electrical output is required and usually sets a higher value, hence a higher priority on the electrical output rather than the heat output.
In Stand Alone, the MicroTurbine is programmed to follow the electrical load. As in Grid Connect, the water temperature is fixed. The diverter attempts to maintain a constant water temperature, despite the varying electrical output.
Thermal Priority – In this mode, the water temperature setpoint is fixed and is maintained by automatically varying the MicroTurbine electrical output. During this time, the diverter is fully closed, routing all the exhaust heat through the heat exchanger. If the MicroTurbine is operating at its minimum speed and power (idle), the diverter will begin to open if the water temperature begins to rise above its setpoint. At no time, will the heat exchanger be allowed to operate at an unsafe temperature.
This mode is typically used when maximum fuel efficiency is desired and electrical output is secondary. However, maximum efficiency can be maintained as long as minimum heat load can be achieved without opening the bypass. Thermal Priority can be used only in Grid Connect mode, and cannot be used in Stand Alone operation.
Page 40 of 56 400001-001 Rev. C (February 2005)
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 product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.
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