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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Heat Recovery Module (HRM) User’s Manual for C200 MicroTurbine Main Features The various features of the C200 HRM are described in the following paragraphs. Heat Recovery The C200 HRM transfers heat from the MicroTurbine exhaust to water that flows through the HRM. Water is pumped into the header manifold inlet, flows through finned tube assemblies in the enclosure of the HRM, and exits at the header manifold outlet. A thermocouple installed in the manifold tube at the outlet is used to monitor the temperature of the water as it leaves the HRM. Exhaust from the MicroTurbine enters and exits the HRM at the exhaust bypass assembly. The exhaust moves around the finned tube assemblies to transfer heat to the water that flows through the tube assemblies. The exhaust then leaves the HRM at a cooler temperature. The exhaust diverter valve, controlled by the modulating actuator, determines the actual amount of exhaust that enters the HRM from the exhaust bypass assembly. Heat transfer is modulated within a range determined by the operational range of the bypass assembly between the full bypass and full operating positions. When the exhaust diverter is in the full bypass position, the least amount of exhaust that enters the bypass assembly goes into the HRM, and it leaves the HRM with the least amount of its heat transferred to the water. As the exhaust diverter moves toward the full operating position, however, more exhaust is directed into the HRM. The exhaust diverter is not able to completely bypass exhaust energy due to both a small amount of exhaust leakage as well as conduction from the exhaust duct. Minimum heat recovery is 6 kW (20,000 BTU/hr). Temperature Control and Monitoring The C200 HRM maintains the temperature of the water at the HRM outlet based on a user- defined setpoint. An operator uses the temperature setpoint controller on the HRM control panel to enter the setpoint value. The thermocouple installed on the water outlet tube converts the water temperature to an electrical signal that is read by the controller. The controller continually compares the value of the signal from the thermocouple with the value of the setpoint. At the command of the controller, the modulating actuator moves the exhaust diverter to reduce or increase the flow of exhaust through the HRM. This moves the water temperature up or down as needed to match the value of the setpoint. The temperature of the water at the outlet tube, as measured by the thermocouple, is stored in the Process Variable, which is shown on the upper display of the temperature setpoint controller. The operator can use this display to verify that the water temperature is at the desired level. Exhaust Noise Reduction The C200 HRM is designed to reduce turbine noise that comes through the exhaust. During operation, the radial design of the HRM channels the exhaust through an hour glass expansion flow pattern. This lowers the dBA levels of the noise emitted through the exhaust portals when the HRM is in heat recovery mode. 400021 Rev A (September 2008) Page 13 of 22 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | HEAT RECOVERY MODULE (HRM) USER’S MANUAL FOR C200 MICROTURBINE
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