Thermodynamics analysis for high temperature hydrogen production system

Abstract

Using clean energy sources is considered as a prevention solution for global warming. Hydrogen is one of the most popular clean and renewable fuel which is widely noticed by researchers in different approaches from additive fuel of internal combustion engines to pure feed of fuel cells. Hydrogen production is also one of the most interested field of studies and extended efforts are doing to fined high performance, fast and economical ways of its production. In this work, a novel high temperature steam electrolyser system with main solar integrated Brayton cycle core is proposed and numerically simulated to achieve this goal.Energy and exergy analysis having better perception of system performance is done and Rankine and organic Rankine cycles were utilized cooperating with the main core to improve its efficiency. The influences of different parameters such as turbine inlet temperature, inlet heat flux from the sun, compression ratio and also used organic fluid were investigated based first and second laws. Results show the high performance of proposed system, more than 98% energy efficiency of hydrogen production, besides the simplicity of utilizing it. The most exergy destruction occurs in sun heat flux absorption of

Thermodynamic analysis of a solar-driven high-temperature steam electrolyzer for clean hydrogen production

“…A thermodynamic model of the proposed system has created considering the abovementioned equations to estimate the performance of the overall system and also to investigate each part of the system independently. The solar farm and electrolyzer sections are adopted and validated in the previous works [54,55] while the Rankine cycle is designed conceptually to analyze the system feasibility. The thermodynamic characteristics of each defined stream and also the general system performance are reported in Table 5.…”

“…2. The high performance electrolyzer section is adapted from [54] which has 98% hydrogen separation efficiency. The inlet mass flow rate of electroyzer is determined considering the absorbed heat in solar collector which should be able to provide the demanded temperature of electrolyzer entrance steam after supplying the boiler needed heat.…”

“…The subscripts P and R refer to the reaction products and reactants, respectively. Where 𝑟 is the recycling ratio which is considered 0.02 from ref [54] and M is the molecular weight of species.…”

The Energy and Exergy Analysis of Integrated Hydrogen Production System Using High Temperature Steam Electrolysis with Optimized Water Path

“…Although hydrogen abundantly exists in the earth, it is just found in composition of other materials [6]. In consequent, hydrogen production (HP) is now one of the most interesting field of study and extended works were conducted to improve its RESEARCH NOTE efficiency economically [7][8][9]. The efforts of HP from renewable sources, as sustainable hydrogen economy, can be categorized in two main groups; low and high temperature electrolyzing.…”