This study investigates the contribution from researchers around the world in the field of steam turbines during the period 2000-2020. A bibliometric approach has been applied to illustrate the scientific publications on steam turbines and related topics using the Scopus database, which has 11,751 publications published by 652 authors from more than 500 organizations scattered over 101 countries. Various aspects of the studies have been analyzed such as publication type, fundamental research areas, journals, citations, authorship patterns, affiliations, and most used keywords. In addition, the impact factor, h-index, and Paper İmpact Parameter (PIP) for the number of total citations have been used to reveal the power of countries, institutes, authors, and journals in the field of steam turbines. The results show that the most productive journal or proceedings, author, and country according to PIP are Energy, Ibrahim Dincer, and Singapore, respectively. The results also indicate turbomachinery to cover more papers than other core research areas and engineering subjects to also have the highest ratio.

The supercritical CO2 (s-CO2) power cycle has been taking into account as one of the most effective alternatives for energy conversion because of its higher efficiency and smaller compressor and turbine sizes for many years. A plenty number of parametric and experimental studies for the different type of s-CO2 cycles have been accomplished in the literature. In this paper, a performance analysis based on a power density criterion has been carried out for a simple s-CO2 Brayton power cycle. The parameters which are obtained from analyzes were compared with those of a power performance criterion that is shown that design parameters at maximum power density give a chance to smaller cycle components and more efficient s-CO2 Brayton power cycle. Due to loses in the cycle, the power and thermal efficiency will reduce by a certain amount, however, the maximum power density conditions will still give a better performance than at the maximum power output conditions. The analysis exemplified in this paper may provide a reference for the finding of optimal operating conditions and the design parameters for real s-CO2 Brayton power cycles.

The increasing of fuel prices and global energy demand and enactment of new restrictive emissions regulations require more efficient and environmentally friendly engines to be designed. In this context, conversion of waste heat to useful energy is necessary to design more energy efficient vessel including using more efficient main engines and auxiliary engines. The aim of this study, thermodynamic characteristic of recovery of a ship's main engine waste heat is determined parametrically for waste heat recovery system (WHRS). Naturally, heat exchangers are used for waste heat recovery. Because of that reason, firstly shell–and–tube heat exchanger will be investigated parametrically. In order to make a more accurate calculation, it is important to reflect the pressure and enthalpy variations in the heat exchanger to the heat transfer calculations. After that the Transcritical Organic Rankine Cycle (TORC), which is recommended by many authors for the recovery of waste heat sources at low and medium temperatures, will be examined parametrically. The results show that increasing the number of pipes in the heat exchanger at a certain value may result in a decrease in system performance parameters that is The Net Power and Thermal Efficiency due to decreasing velocity of the mass flow in tubes. Moreover, The Net Power and Thermal Efficiency curves behaved differently with variable mass flow rate. Therefore, we will define performance parameter being important for WHRS.

Thermal energy storage (TES) systems play a pivotal role in the efficient integration of renewable energy sources into the global energy landscape. This bibliometric analysis delves into the evolving research landscape of TES systems, focusing on nearly 19000 scientific papers from the Scopus database as the primary source to identify key research trends, influential authors, and leading institutions shaping the field between 2000 and 2023. The analysis reveals a substantial surge in TES research over the past two decades due to factors such as advancing technology and increasing incentives. China has emerged as a global leader in this domain, followed closely by the United States and India. Xi'an Jiaotong University, De Lleida University, and Tsinghua University are the most prolific institutions in this field. The Journal of Energy Storage is the most frequently paper-published, followed by Applied Thermal Engineering and Applied Energy. Key research themes identified include the development, design, and optimization of heat storage systems, TES system integration with renewable energy sources, and the exploration of phase change materials for efficient energy storage. The analysis also highlights the contributions of prominent researchers in the field. Cabeza LF, Li Y, and Wang Y are identified as the most prolific authors, having made significant contributions to the advancement of TES technology. The increasing demand for sustainable and efficient energy solutions has spurred significant interest in TES systems. As the world transitions towards a low-carbon future, TES systems offer a promising solution for storing excess renewable energy and ensuring a reliable and sustainable energy supply.

HVAC system design and optimization of the ventilation and air-conditioning of indoor environments are crucial for human comfort. Especially in recent years, due to the Covid pandemic, the importance of this hot topic is noticed. This study aims to focus on the HVAC performance of a dorm compartment onboard a naval surface ship since the ship environment is a good example of indoor air ventilation problem. The HVAC performance was investigated using a RANS solver. The numerical analyses were conducted for different scenarios and the results were finally discussed in terms of HVAC system location, air temperature, air intake and outlet conditions. As a conclusion, the current HVAC system design was found insufficient and alternative solutions were proposed in order to improve indoor air quality and thermal comfort.