A CASCADED HEAT EXCHANGER DESIGN BASED ON FLOWING PARTICLE SYSTEM SERVING AS BOTH HEAT TRANSFER FLUID (HTF) AND THERMAL ENERGY STORAGE (TES) MEDIA IS PROPOSED, WHERE SIGNIFICANT PERFORMANCE ENHANCEMENTS WILL BE ACCOMPLISHED IN ELECTRICITY GENERATION THROUGH SUPERCRITICAL CARBON DIOXIDE (SCO2)-BASED BRAYTON CYCLE VIA THE PRIMARY HEAT EXCHANGER (HX) WITH SCO2 OUTPUT AND IN MEETING SOLAR INDUSTRIAL PROCESS HEAT (SIPH) DEMANDS THROUGH SECONDARY HEAT EXCHANGER IN THE FORM OF SATURATED STEAM OUTPUT AT 300°C AND PRESSURIZED WATER OUTPUT AT 150°C; TARGETING OVER 60% OF THE IPH DEMAND-TYPES. THE PROJECT OBJECTIVE IS TO DEMONSTRATE AN INTEGRATED APPROACH WHERE ADVANCED MANUFACTURING CAN BE LEVERAGED TO MEET BOTH POWER GENERATION AND INDUSTRIAL PROCESS HEAT DEMANDS. THE CASCADED HEAT EXCHANGER DESIGN IS COMPRISED OF TWO HEAT EXCHANGERS, PRIMARY AND SECONDARY. PRIMARY HEAT EXCHANGER WILL BE DESIGNED FOR PARTICLE-TO-SCO2 HEAT EXCHANGE IN A SHELL-AND-PLATE CONFIGURATION. THE RESEARCH IS FOCUSED ON SIGNIFICANTLY IMPROVING THE PARTICLE-SIDE CONVECTIVE HEAT TRANSFER COMPARED TO THE STATE-OF-THE-ART PARALLEL PLATE MOVING PACKED BED CONFIGURATION, BY INTRODUCING HIGHLY EFFICIENT LATTICE STRUCTURES INTEGRATED WITH THE PARALLEL PLATE. THESE LATTICE STRUCTURES WILL BE BASED ON UNIT CELL TOPOLOGIES FROM THE OCTAHEDRON FAMILY AND WILL BE ADDITIVELY MANUFACTURED (AM) WITH NICKEL-BASED ALLOYS. THESE LATTICE COUPONS WILL BE DIFFUSION BONDED WITH CHEMICALLY ETCHED SCO2 MINICHANNELS ON EITHER OF ITS SIDES. THE INTEGRATED AM-DIFFUSION BONDED PARTICLE AND SCO2 MINICHANNEL STACKS WILL BE ATTACHED WITH PARTICLE AND SCO2 HEADERS TO FORM THE PRIMARY HEAT EXCHANGER. IN OUR PRIOR SETO PROJECT (SIPS: DE-EE-0009377), WE SUCCESSFULLY DEMONSTRATED THE INTEGRATION OF AM COUPONS WITH ETCHED MINICHANNELS VIA DIFFUSION BONDING, WHERE THE MATERIAL WAS SS316L FOR BOTH AM AND MINICHANNEL PLATES. ON THE OTHER HAND, THE CASCADED SECONDARY HEAT EXCHANGER (SHELL-AND-TUBE TYPE) WILL BE CONNECTED DOWNSTREAM OF THE PRIMARY HEAT EXCHANGER, THUS RECEIVING THE PARTICLE OUTPUT FROM THE PRIMARY HEAT EXCHANGER, TO MEET THE LOW TEMPERATURE IPH DEMANDS IN TWO DISTINCT TEMPERATURE BANDS. THIS EFFICIENT CONCEPT OF UTILIZING THE WASTE (BUT HIGH GRADE) HEAT EXITING IN THE FORM OF STORED THERMAL ENERGY IN THE PARTICLES EXITING PRIMARY HEAT EXCHANGER, WILL DRIVE THE HEAT EXCHANGE IN THE SECONDARY HEAT EXCHANGER. THE SECONDARY HX WILL BE OF SHELL-AND-TUBE CONFIGURATION WITH THE SHELL-SIDE FEATURING HIGH TEMPERATURE METALLIC FOAMS (NICKEL-BASED) INTEGRATED ON THE TUBE EXTERNAL WALLS. THE TUBES WILL BE CARRYING WATER AT DIFFERENT PRESSURE/TEMPERATURES AND HENCE AT DIFFERENT THERMODYNAMIC STATES. THE METAL FOAMS WILL BE MADE FROM NICKEL ALLOYS AND WILL BE BRAZED ONTO THE TUBE EXTERNAL WALLS TO ENHANCE THE CONVECTIVE HEAT TRANSFER COEFFICIENT ON THE PARTICLE SIDE. THE SECONDARY HX WILL HAVE TWO OUTLETS FOR PROCESS HEAT IN THE FORM OF PRESSURIZED WATER (AT 150°C) AND SATURATED STEAM (AT 300°C). THE OUTCOME OF THIS PROJECT IS LOW-COST ELECTRICITY AND LOW-COST PROCESS HEAT PRODUCTION TECHNOLOGY WHICH IS SCALABLE AND CAN BE MODIFIED TO ACCOMMODATE VARIOUS INDUSTRIAL PROCESSES ON THE SITE OF THE CSP-BASED ELECTRICITY PRODUCTION. BP1 OBJECTIVES: (1) CORRELATION FOR PARTICLE-SIDE HEAT TRANSFER COEFFICIENT (HP) WITH DESIGN VARIABLES AND OPERATING CONDITIONS, WITH A MINIMUM OF TWO PATHWAYS TOWARDS ACHIEVING H_P>500 W/(M^2 K),K_EFF>5 W/MK, (2) VALIDATED COMPUTATIONAL MODEL WITHIN ±5% OF THE EXPERIMENTS, (3) FINALIZED DIMENSIONAL AND TOPOLOGY MORPHOLOGICAL FRAMEWORK GUIDED BY MATERIAL SELECTION AND AM PROCESS. BP2 OBJECTIVES: (1) THROUGH ROM PROJECTIONS, SHOW UAPRIM> 300 W/M2K, (2) SUCCESSFUL FABRICATION OF PRIMARY HX AND PRESSURE TEST-BASED CERTIFIED QUALIFICATION FOR SCO2 TESTING AT ELEVATED TEMPERATURES, (3) CORRELATION FOR PARTICLE-SIDE HEAT TRANSFER COEFFICIENT (HP) WITH DESIGN VARIABLES AND OPERATING CONDITIONS, WITH A MINIMUM OF TWO PATHWAYS TOWARDS ACHIEVING H_P>500 W/(M^2 K),K_EFF>10 W/MK, (4) FINALIZED DESIGN FOR SECONDARY HX INCLUDING SERPENTINE TUBE ARRANGEMENTS AND NI DISTRIBUTION. BP3 OBJECTIVES: INTEGRATED HX FABRICATION, TESTING, AND CHARACTERIZATION TO DEMONSTRATE EXCEEDING LCOE < $0.045/KWH AND SIPH TARGETS (LCOH < $0.01-0.025/KWH).