This paper focuses on higher order modeling and design of the free-piston Stirling engine (FPSE) based on Ant Colony Optimization (ACO). First, the governing thermodynamics and dynamical equations of the engine have been derived. Then, the design parameters of the engine are selected taking into account the finite heat transfer coefficient (resulting in a fifth-order model) and pressure drop (resulting in a sixth-order model) in the dynamical system and the corresponding differential equations are derived in detail. In the following, the mentioned methods and their performance in modeling the FPSE dynamics are investigated. The simulated results show that the effect of the pressure drop on the places of the closed-loop poles of the system is not significant, while the heat transfer coefficient has a considerable effect on the engine dynamics. Accordingly, a fifth-order model along with ACO algorithm is proposed to justify the FPSE behavior. To validate the presented modeling scheme, the prototype engine SUTECH-SR-1 was experimented. It is found that the values of parameters obtained from the proposed design method are close to those of the experiment. Besides, the presented higher order model predicts the engine behavior with an acceptable accuracy through which the validity of the design technique is affirmed. Initial pressure of working gas (Pa) P w Power generation (J/s) P Nonlinear pressure (Pa) R Ideal gas constant J kgVolume of expansion space m

Biohydrogen production could be generated from organic wastes: food and beverage processing wastewater, restaurant food waste and raw starch waste. Fermentative hydrogen production from food and beverage processing wastewater by sewage microflora was optimized in terms of pH (4.5-7.0), mesophilic condition (35 ± 2°C) and thermophilic condition (50 ± 2°C). Low initial pH (6.5) and mesophilic condition favored hydrogen production (0.28 L/L) indicating that such parameters along with the wastewater characteristics were crucial to dark-fermentative hydrogen production. Pretreatment methods (methanogenic inhibitor, sterilization, sonication and acidification) on restaurant food waste and raw starch waste to enhance biohydrogen production were also investigated in this study. Maximum hydrogen yields of 3.48 and 2.18 ml H 2 /g COD were observed on sterilization of pretreated restaurant food and raw starch wastes, respectively.

The objective of this study was conducted to compare the feasibility of producing hydrogen from food and beverage processing wastewater by anaerobic microflora enriched of starch versus coconut milk sludge at initial pH 6.5 under mesophilic condition (35±2ºC) in a batch reactor. Biohydrogen production could be generated from food and beverage processing wastewater, except winery and brewery wastewater employing the enriching hydrogen-producing bacteria of coconut milk or starch sludge. Results revealed that the maximum cumulative hydrogen production (0.33 L H 2 LG 1 wastewater) was observed from coconut milk wastewater by enriching hydrogen-producing bacteria of coconut milk sludge. It was more than twofold higher than that of enriching hydrogen-producing bacteria of starch sludge (0.15 L H 2 LG 1 wastewater). Composition of volatile fatty acid showed the presence of acetate, butyrate and the lower propionate concentration. Chemical Oxygen Demand (COD) removal was in the range of 4.70-64.98.