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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Model C60 Integrated CHP Major System Components Figure 1 shows the major elements in the C60 ICHP system heat recovery module. The MicroTurbine components provide the same functionality and control as the standard Capstone C60 high pressure natural gas system. The CHP system adds the following major elements: 1. Gas to Water Heat Exchanger – An efficient heat exchanger core is provided to extract energy from the MicroTurbine exhaust. It uses counter flow of exhaust and water to provide the maximum heat transfer. Standard construction is copper tubes with copper fins on the exhaust gas side. 2. Exhaust Gas Diverter – An exhaust gas diverter plate controls the amount of waste exhaust heat that passes through the heat exchanger. In the bypass position, nearly all of the MicroTurbine’s exhaust is directed straight out, avoiding contact with the heat exchanger. Only a small amount (approximately 10,000 BTU/hr, or 3kWt) of the MicroTurbine’s waste heat is transmitted into the water in the heat exchanger through conduction in the heat exchanger assembly and convection due to small amounts of exhaust leakage past the diverter. When moved to the full heat recovery position, the diverter forces most of the MicroTurbine exhaust through the heat exchanger. The diverter is also able to operate at intermediate positions, allowing part of the exhaust to flow across the heat exchanger. The diverter is driven by a linear actuator, which is controlled by the internal system logic and can modulate to provide “Thermal Tracking” independently of electric power output. 3. Linear Actuator – The linear actuator controls the diverter position, and receives its input command from the CHP Control Board. The actuator is rated for the high temperatures it may encounter near the heat exchanger and exhaust ducting. 4. CHP Control Board – Most of the CHP system inputs and outputs are monitored and controlled with the CHP control board assembly. This control board is an intelligent I/O module able to convert analog signals to digital values and communicate them to the MicroTurbine’s main CPU using the Capstone internal RS 485 communications bus. It is also a power supply for the linear actuator, providing the current to drive the diverter between bypass and recovery positions. 5. Water Temperature Sensors – Resistive thermal device (RTD) sensors are mounted to the water inlet and outlet connections of the heat exchanger, and are read by the CHP Control Board. These measured water temperatures can also be read from the C60 MicroTurbine display. 6. Flow Switch – A water flow switch is provided on the heat exchanger outlet to confirm proper system operation. Its contact output is wired into the CHP Control Board. The flow switch will close its contacts to indicate water flow above about 1.3 l/s (20 gpm). If no flow is detected (flow switch contact open), the CHP Control Board will signal a fault condition, and the C60 MicroTurbine will shut down to prevent or limit over temperature damage to the heat exchanger core. 7. Safety Relief Valve – A pressure relief valve is installed at the water outlet to prevent damage to the heat exchanger core due to unexpected high pressure. The relief valve is set for 125 psi. 480007-001 Rev D (June 2005) Page 7 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.PDF Image | Application Guide - Model C60 Integrated CHP (ICHP)
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