energies Editorial Selected Papers from the XI International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT 2018) Jan Taler 1, *, Pawel Oclo ´ n 1 , Marcin Trojan 1 and Abdulmajeed Mohamad 2 1 Department of Energy, Cracow University of Technology, Al. Jana Pawla II 37, 31-864 Cracow, Poland; poclon@mech.pk.edu.pl (P.O.); marcin.trojan@pk.edu.pl (M.T.) 2 Mechanical and Manufacturing Engineering, SSE, University of Calgary, 2500 University Drive, NW, Calgary, AB T2N 1N4, Canada; mohamad@ucalgary.ca * Correspondence: taler@mech.pk.edu.pl; Tel.: +48-12-628-35-54 Received: 17 April 2019; Accepted: 5 June 2019; Published: 13 June 2019   1. Introduction Energies presents 10 papers selected from the 11th International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT2018). The Conference was held in Cracow, Poland, in 21–24 May 2018. The conference has been organized successfully for over 18 years in many countries including Cyprus, Brazil, Canada, France, China, Turkey, South Korea, and Poland. During the ICCHMT2018, over 300 participants presented their works during the oral, poster, and keynote sessions. The following countries were represented: Poland, China, India, Ukraine, England, South Korea, USA, Romania, Germany, Australia, Sweden, France, Canada, Japan, Brazil, Russia, Finland, Belarus, Italy, and Slovenia. In total, 24 oral sessions, four Keynote sessions, and three poster sessions were performed. The Keynote Lectures were presented by world-recognized experts in energy engineering and heat transfer: Prof. Qiuwang Wang, Dr. Mustafa Mohamad, Prof. Ulrich Gross, Prof. Pradeep Bansal, Prof. Kamel Hooman, Prof. Jiˇ rí Jaromír Klemeš, Prof. Bozidar Sarler, Prof. Jean Taine, Prof. Sang-Ho Suh, Prof. Li-Zhi Zhang, and Prof. Zhiguo Qu. The ICCHMT2018 conference topics related to energy engineering were: • Energy systems simulation, • thermal energy storage, • fluid machinery simulation • turbulent flow simulation, • convection heat transfer, • inverse heat transfer and optimization in thermal engineering, • combustion modelling, and • enhanced heat transfer and heat exchangers. 2. Special Issue Content The Special Issue presents 10 papers related to energy engineering. Mohamad et al. [1] developed a modified Tromble wall system. The system utilizes a water tank, which is part of the building’s wall, for storage and hot water supply. The proposed passive system can be used for heating a room in the day and if the heat is available in excess, at night too. The mathematical model of a modified Tromble wall is simplified and efficient, and can be used for performance evaluation of energy systems. Kim et al. [2] analyzed the flow of the tip clearance and its effect on Kaplan turbine performance as well as hydraulic efficiency, to improve the understanding of the flow field in a Kaplan turbine. Gr ˛ adziel Energies 2019, 12, 2259; doi:10.3390/en12122259 www.mdpi.com/journal/energies