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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Capstone MicroTurbine C200 Heat Recovery Module (HRM) User’s Manual Exhaust from the microturbine enters and exits the HRM at the exhaust bypass assembly. The exhaust moves around the finned tube assembly to transfer heat to the water within the tube assembly. The exhaust then leaves the HRM at a cooler temperature. The position of the exhaust diverter, located within the exhaust bypass assembly and controlled by the modulating actuator, determines the actual amount of exhaust that passes over the tube assembly. The exhaust diverter’s operational range extends from full bypass to full recovery. When the exhaust diverter is in the full bypass position, the HRM will transfer the minimum amount of exhaust energy into the water. The exhaust diverter, however, is not able to completely bypass all exhaust energy due to both a small amount of exhaust leakage as well as conduction from the bypass assembly. As such, the user must design for the minimum amount of heat recovery of 6 kW (20,500 BTU/hr) when in full bypass. 2.1.2. Temperature Control and Monitoring The C200 HRM maintains the temperature of the water at the header manifold outlet based on a user-defined setpoint. An operator uses the temperature controller on the HRM control panel to enter the setpoint value. The thermocouple installed on the water outlet tube provides the controller with a feedback signal indicating the temperature of the water as it exits the HRM. The controller continually compares the value of the thermocouple signal 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 heat exchanger within the HRM. This adjusts the water temperature up or down as needed to match the value of the setpoint. The temperature of the water at the header manifold outlet, as measured by the thermocouple, is stored in the Process Variable of the temperature controller, which is shown on the upper display of the controller (see Figure 4). The operator can use this display to verify that the water temperature is at the desired level. 2.2. C200 CARB CARB is an acronym for the Air Resources Board (ARB) of California. The California ARB may certify Distributed Generation (DG) units for use in California. DG units manufactured after January 1, 2007 for use with natural gas may certify to the 2007 Fossil Fuel Emissions Standards, where natural gas is defined as "California Public Utility Commission (CPUC) quality natural gas." DG units that produce combined heat and power are allowed to take credit for the heat recovered when determining emissions compliance as long as the heat recovery is integrated with the power technology in a standardized package and a minimum energy efficiency of 60 percent is achieved. For natural gas projects within California that require CARB certification, Capstone offers a CARB-certified solution consisting of a C200 microturbine with a HRM (see Figure 1). For CARB certification, the microturbine includes an internal Catalyst Reduction Module (CRM) within the exhaust stream. Refer to the C200 CARB Product Specification (Table 1) for additional details. 3. Operating the C200 HRM Typical operation of the C200 HRM involves the use of the temperature controller that is integrated into the HRM control panel to control the water outlet temperature. The following paragraphs describe the operating procedures of the temperature controller. 400021 Rev B (October 2012) Page 13 of 26 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 | Capstone MicroTurbine C200 Heat Recovery Module (HRM) User’s Manual
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