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Steam trap Specification: SpiraxSarco FT- 30; Maximum operating Pressure: 30psig; Maximum Temperature: 45oF of superheat at all operating pressures Steam trap was selected based on power plant steam supply pressure range of 18psig to 24psig. VFD pump for hot water loop i. Bell & Gossett 20hp pump (1750rpm) rated for VFD operation. ii. Rated for 250gpm and head of 116feet of water i. Pump was selected based on the pressure drop in the hot water piping calculated using pressure drop across various components. ii. Pump was also selected in communication with pump manufacturer. iii. VFD is for various flow rates of hot water. Expansion tank Extrol SX-40V; Pre-charged to 12psi. Expansion tank volume selection: ASRAE handbook standard procedure with a factor of safety margin (for high temperature and above atmosphere pressures of hot water). The calculated expansion volume based on handbook was 3.5gal. Air separator Pressure relief valve BTU meters Check valve Bell & Gossett Rolairtrol R-4F air separator: 300gpm and 4” flange Bell & Gossett 45psi pressure relief (PR) valve Kamstrup BTU meters on hot water loop and cold water loop Walworth 3” 150psi check valve Air separator selection was based on the maximum hot water flow (300gpm) in the loop. 45psi PR is used to accommodate for above boiling water temperature of 235oF. For measuring the heat supplied by hot water to GM and heat rejected to cold water by GM To prevent cold water flow back into fire hydrant 3-way butterfly valve Triad 4” 3-way butterfly valves with double acting actuator Two three way butterfly valves were used in the cold water bypass loop to control the cold water supply temperature to GM by recirculating the warm water coming out of GM Cold water pump 15hp Scott Pump with 3500rpm Cold water pump will only be used during the performance testing of the GM when the recirculation of warm water is needed to test the GM at varying cold water temperatures. Electrical cable for uploading power 3/0 metal-clad (MC) three conductor cable with ground (Due to unavailability of 1/0 cable and time concern) The cable size was selected based on the distance between the GM and power plant motor center (point for power up-loading to UAF grid), voltage drop, and heat generated due to cable resistance. According to standard handbook calculation 1/0 cable was enough to serve the purpose. Grid protection relay Beckwith grid protection relay model # M-3410A To protect mainly the utility (grid system) from GM and to protect the GM itself. If there is large voltage (±10%) or frequency fluctuations in the utility system the GPR sends a signal for GM shutdown. 25PDF Image | Optimizing Heat Recovery Systems for Power Generation in Rural AK
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