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relatively high flow rate of 260 gpm. We will also have large winter to summer feed water temperature variations (~278-298 K). The combination of the variations in the feed-water pump flow rate and recirculation of the warm water will reduce the time it takes to reach a specified compressor inlet temperature, and will also allow for operations over a wide range of wet bulb temperatures throughout the year. To measure the fluid temperatures (water and CO2) we will primarily use Resistance Thermometry Devices (RTD’s) which have an accuracy of ~0.2 K. However, heat transfer down the length of the RTD electrode may significantly affect the accuracy of the temperature measurement when they are inserted, especially in the smaller 38-50mm ID ducting. P P M r M Ma a ai i n n nC C Co o om m mp p p r re e es s T e ss so es o st r r I t tM In M Ma nl l e e a a t et t t C tr r ri i x x x f Co o on fo n n d O p O u or di i t t s s e u i e u t t l io on ud o ns d o om le et s L l L i m p t oC i n n e C r e ri i t t i i c ca a l C C h I r I n h i n l i l ll le le er M M a a i i n nC C P Pr r o o op p p o os s se e ed d d T M M a a i i n nC I p C o om m p 0 F G 0.80 . 5 . 0.75 6 0 65 5 0 5 0 . D C D 0 . 4 4 0 0 BA 0 . C . 2 25 e t t E B A E 0 Density kg / liter In n l le et t 0 . .2 2 0 00 0. . 1 15 Liquid 44 kg CO2 Fill Figure 2-9: Temperature entropy diagram for CO2 near the critical point. The green curves indicate the T-S path for CO2 flow in the gas chiller, in the compressor, and during heating in either the recuperator or a heater. The red lines show the range of compressor inlet conditions that we intent to operate the loop at. Note that the test lines roughly follow the lines on constant density, and they vary from a low density of 0.15 kg/liter to a high of 0.80 kg/liter over a temperature range from 290 K to 318 K. The blue dotted line shows the pseudo-critical points where large peaks in the heat capacity and viscosity are observed. 2.3.1 Thermodynamic cycle analysis of the compression loop Sandia’s supercritical CO2 cycle analysis tools were used to evaluate the operation of the S-CO2 compressor for various compressor inlet temperatures and pressures. For simplicity’s sake, we have estimated the compression loop operating conditions at three conditions. One is at or very near the critical point (305.3 K, 7690 kPa), the other is on the liquid side of the saturation curve (295 K , 7690 kPa) and the other is on the vapor side of the dome (295K, 5000 kPa). These operating conditions are approximately indicated by the lower portion of the red lines marked A, E, and F in Figure 2-2. 22 Vapor 8 kg CO2 FillPDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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