Evolvable hardware (EHW) realizes circuit function through evolution. It may be viewed as the combination of EAs (evolutionary algorithms) and PLDs (programmable logic devices). At present the main problem is that the...Evolvable hardware (EHW) realizes circuit function through evolution. It may be viewed as the combination of EAs (evolutionary algorithms) and PLDs (programmable logic devices). At present the main problem is that the speed of evolution is too slow. In order to tackle the problem, we must do work from two aspects: algorithm and device structure. This paper presents a function PLD as a new EHW's structure. So the efficiency of coding is improved, and evolution is sped up. A 4-bit comparator is successfully completed.展开更多
Exhaust hot water （EHW） is widely used for various industrial processes. However, the excess heat carried by EHW is typically ignored and discharged into the environment, resulting in heat loss and heat pollution. A...Exhaust hot water （EHW） is widely used for various industrial processes. However, the excess heat carried by EHW is typically ignored and discharged into the environment, resulting in heat loss and heat pollution. An organic Rankine cycle （ORC） is an attractive technology to recycle heat from low-temperature energy carriers. Herein, ORC was used to recycle the heat carried by EHW. To investigate the energy and exergy recovery effects of EHW, a mathematical model was developed and a parametric study was conducted. The energy efficiency and exergy efficiency of the EHW-driven ORC system were modeled with R245fa, Rl13 and R123 as the working fluids. The results demonstrate that the EHW and evaporation temperatures have significant effects on the energy and exergy efficiencies of the EHW-driven ORC system. Under given EHW conditions, an optimum evaporation temperature exists corresponding to the highest exergy efficiency. To further use the low-temperature EHW, a configuration retrofitted to the ORC by combining with flash evaporation （FE） was conducted. For an EHW at 120 ~C and 0.2 MPa, the maximum exergy efficiency of the FE-ORC system is 45.91% at a flash pressure of 0.088 MPa. The FE-ORC performs better in exergy efficiency than the basic FE and basic EHW-driven ORC.展开更多
文摘Evolvable hardware (EHW) realizes circuit function through evolution. It may be viewed as the combination of EAs (evolutionary algorithms) and PLDs (programmable logic devices). At present the main problem is that the speed of evolution is too slow. In order to tackle the problem, we must do work from two aspects: algorithm and device structure. This paper presents a function PLD as a new EHW's structure. So the efficiency of coding is improved, and evolution is sped up. A 4-bit comparator is successfully completed.
基金国家重点基础研究发展规划(973)(the National Grand Fundamental Research 973 Program of China under Grant No.2004CB318103)国家自然科学基金(the National Natural Science Foundation of China under Grant No.60133010)江西省研究生创新基金项目(No YC07A073)
基金Projects（51704069, 51734004, 71403175） supported by the National Natural Science Foundation of China Project（N162504011） supported by the Fundamental Research Funds for the Central Universities, China
文摘Exhaust hot water （EHW） is widely used for various industrial processes. However, the excess heat carried by EHW is typically ignored and discharged into the environment, resulting in heat loss and heat pollution. An organic Rankine cycle （ORC） is an attractive technology to recycle heat from low-temperature energy carriers. Herein, ORC was used to recycle the heat carried by EHW. To investigate the energy and exergy recovery effects of EHW, a mathematical model was developed and a parametric study was conducted. The energy efficiency and exergy efficiency of the EHW-driven ORC system were modeled with R245fa, Rl13 and R123 as the working fluids. The results demonstrate that the EHW and evaporation temperatures have significant effects on the energy and exergy efficiencies of the EHW-driven ORC system. Under given EHW conditions, an optimum evaporation temperature exists corresponding to the highest exergy efficiency. To further use the low-temperature EHW, a configuration retrofitted to the ORC by combining with flash evaporation （FE） was conducted. For an EHW at 120 ~C and 0.2 MPa, the maximum exergy efficiency of the FE-ORC system is 45.91% at a flash pressure of 0.088 MPa. The FE-ORC performs better in exergy efficiency than the basic FE and basic EHW-driven ORC.
