Optimizing Heat Recovery Systems for Power Generation in Rural AK

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Optimizing Heat Recovery Systems for Power Generation in Rural AK ( optimizing-heat-recovery-systems-power-generation-rural-ak )

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Chapter 7 Experimental Setup and Testing Schedule EXPERIMENTAL SETUP: The experimental site was set up in the UAF power plant. The set up includes a 50kW GM heat engine (the ORC system), a heating source system to supply heat to GM, a cooling sink loop to absorb the expelled heat from GM, electrical cables for both up loading the generated electricity and electrical power consumption to the operation pumps of the heating and cooling loops. Some of the specification information includes electrical characteristics of the GM (i.e. 450-500 VAC/2 phase/100/60Hz, 50 kW, 24VDC), hot and cold water connection (heating source 190oF-240oF and 175gpm, cooling source 40oF-110oF and 250gpm, working fluid R345f), mechanical specifications (8’x6.5’x7.5’ and 7,300 lbs), environmental specifications (storage 20oF-140oF, relative humidity 0.95, noise 96db at 3’), and controls (inputs- HMI, physical switch, and emergency stop button; output- relay contacts for heating and cooling water supplies, hot water by-pass, and dry cooler control; Remote control- remote monitoring and machine control via internet). Set-ups for heating system, cooling system, external electrical system, data acquisition system, and internet connection have been discussed in details in Chapter 4 (Test Plan, Design and Selection of Components, and Procurement) and Chapter 5 (Installation and Instrumentation). TESTING SCHEDULE: Reliability test is a test for 600 hours with the GM under full capacity under a constant operation condition (Planned: heating source at 160gpm and 225oF; cooling source at 160gpm and 50F). Performance test has been conducted for the GM running under different combinations of cooling and heating conditions, which are listed in Table 4. Each case was operated for 30 minutes for data collection. Table 4 Different Conditions of Heating and Cooling Sources Adopted for Performance Test. (Cooling source temperature = 50oF) Heating Temperature (oF) Heating Flow Rate (gpm) Cooling Flow Rate (gpm) According to Table 4, the total number of possible cases is 75 (5x5x3). The number of cases to be investigated will be increased for another cooling flow temperature (60 oF), if the GM will stay in the current test site for another month and cooling water supply is still available. 155 175 120 160 120 160 200 195 215 225 200 250 300 30

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