Heat and Mass Transfer

Major: Building Energy Performans and Engineering Systems
Code of subject: 7.192.09.O.003
Credits: 4.00
Department: Heat and Gas Supply and Ventilation
Lecturer: DSc., Prof. Labay Volodymyr Yosyfovych
Semester: 1 семестр
Mode of study: денна
Мета вивчення дисципліни: Heat and mass transfer, as a general scientific discipline, is a connecting link between general theoretical subjects (mathematics, physics, chemistry, thermodynamics) and special courses devoted to the study of processes in heat, gas and ventilation systems, devices and machines. This discipline, being also basic in the training of specialists in the field of Construction and Civil Engineering, should serve as the basis for applied disciplines such as Ventilation and Air Conditioning, etc. Therefore, the teaching of this discipline aims to give students in-depth knowledge in the field of heat and mass transfer processes in order to prepare them for effective perception of the material taught in subsequent courses, as well as to expand their general technical outlook.
Завдання: General competences: Knowledge and understanding of the subject area and professional activity, the ability to effectively apply knowledge to solve practical tasks. Professional competences: knowledge of modern requirements of regulatory documentation in the field of construction; SC01. Ability to use conceptual scientific and practical knowledge of mathematics, chemistry and physics to solve complex practical problems in the field of construction and civil engineering; professional competences of the specialty of the professional direction: CSP701. The ability to calculate and analyze the processes of heat and mass exchange, hydrogas- and aerodynamics from the point of view of fundamental physical laws, principles and knowledge; CSP705. Ability to apply elements of reliability theories, optimization, other mathematical and numerical methods for the design of new, reconstruction of existing HVAC systems; CSP706. The ability to perform experimental studies, to carry out field tests of HVAC systems, to know modern instrumentation and research methods, as well as to describe, analyze and critically evaluate the results of research.
Learning outcomes: RS01. Apply basic theories, methods, and principles of mathematical, natural, social, humanistic, and economic sciences, modern models, methods, and decision-making support software to solve complex construction and civil engineering problems. PRS701. Demonstrate knowledge and understanding of the basics of heat and mass transfer, hydrogas and aerodynamics, which take place in the technological processes of heat and gas supply, ventilation and air conditioning (HVAC) systems. PRS702. Demonstrate knowledge and understanding of the sections of mathematics relevant to the basic level of processes of HVAC systems: differential and integral calculus, algebra, functional analysis, statistics, etc. KN1. Conceptual scientific and practical knowledge, critical understanding of theories, principles, methods and concepts in the field of professional activity and/or education.
Required prior and related subjects: «Higher Mathematics», «Physics», «Heat, Gas Supply and Ventilation», «Technical thermophysics», «Heat supply», «Radiation cooling and heating of premises», «Ventilation».
Summary of the subject: The main principles of the theory of heat conduction, convective heat transfer, heat transfer due to phase transformations, radiation heat transfer, heat transfer, molecular and convective diffusion are outlined. Information on the thermal calculation of heat exchangers and mass-mass transfer exchangers, which take place in HVAC systems, is given. Designated educational discipline for bachelors of the specialty "Construction and civil engineering", full-time forms of education.
Опис: Heat and mass transfer processes in HVAC systems are an integral part of heat and gas supply and ventilation. Methods of heat transfer. Heat balances. Thermal conductivity. Fourier's law of thermal conductivity. Thermal conductivity coefficient. Differential equation of thermal conductivity. Thermal resistance of thermal conductivity of homogeneous and multilayer flat wall. Linear thermal resistance of thermal conductivity of homogeneous and multilayer cylindrical wall. Convective heat transfer. The basic law of convective Newton-Richman heat transfer. Heat transfer coefficient. Thermal heat transfer resistance. The concept of free and forced convection. Laminar and turbulent flow regimes. The concept of hydrodynamic and thermal boundary layers. System of differential equations of convective heat transfer. Differential heat transfer equation. Application of similarity theory in the study of heat transfer processes. Similarity constants. Numbers (criteria) of similarity. Similarity equation. The concept of the method of dimensional analysis and its application to obtain similarity equations. Experimental method of obtaining criterion equations of heat transfer. Calculated dependences for determining convective heat transfer coefficients. Radiant heat transfer. Basic laws of radiant heat transfer. Planck's law. The Law of Wine. Stefan-Boltzmann law. Kirchhoff's law. Lambert's law. Heat exchange by radiation of a system of bodies. Heat transfer. Complex heat transfer. Total heat transfer coefficient. Heat transfer between two liquids (gases) through a flat single-layer wall separating them. Heat transfer coefficient. Heat transfer through a multilayer flat wall. Thermal resistance of heat transfer. Methods of intensification of heat transfer. Thermal insulation. Classification of heat exchangers. Fundamentals of thermal calculation of heat exchangers of recuperative type. Mass transfer. Basic concepts and definitions. Molecular diffusion, Fick's first law, molecular diffusion coefficient. Stationary one-dimensional molecular diffusion. Convective mass transfer. The basic law of convective mass transfer. Mass transfer coefficient. The concept of diffusion boundary layer. System of differential equations of convective (vortex) mass transfer. Fick's second law. Diffusion numbers of Nusselt (Sherwood number) and Prandtl (Schmidt number). Analogy of heat and mass transfer. Heat and moisture exchange of air with water.
Assessment methods and criteria: Cumulative point-rating system, which involves evaluating students for all types of classroom and extra-curricular educational and scientific activities, aimed at mastering the educational load of the educational and professional program: current control, laboratory reports, oral presentations, defense of course projects and graphic and calculation works, written and oral exams and assessments; practice on the subject of the magister's qualification work, defense of the magister's qualification work.
Критерії оцінювання результатів навчання: Current control (laboratory works - 20 points, oral examination - 20 points); final control (60 points, control measure, written and oral form, exam).
Порядок та критерії виставляння балів та оцінок: 100–88 points – (“excellent”) is awarded for a high level of knowledge (some inaccuracies are allowed) of the educational material of the component contained in the main and additional recommended literary sources, the ability to analyze the phenomena being studied in their interrelationship and development, clearly, succinctly, logically, consistently answer the questions, the ability to apply theoretical provisions when solving practical problems; 87–71 points – (“good”) is awarded for a generally correct understanding of the educational material of the component, including calculations, reasoned answers to the questions posed, which, however, contain certain (insignificant) shortcomings, for the ability to apply theoretical provisions when solving practical tasks; 70 – 50 points – (“satisfactory”) awarded for weak knowledge of the component’s educational material, inaccurate or poorly reasoned answers, with a violation of the sequence of presentation, for weak application of theoretical provisions when solving practical problems; 49-26 points - ("not certified" with the possibility of retaking the semester control) is awarded for ignorance of a significant part of the educational material of the component, significant errors in answering questions, inability to apply theoretical provisions when solving practical problems; 25-00 points - ("unsatisfactory" with mandatory re-study) is awarded for ignorance of a significant part of the educational material of the component, significant errors in answering questions, inability to navigate when solving practical problems, ignorance of the main fundamental provisions.
Recommended books: 1. Labay V.Y. Heat and mass transfer processes in HGSV systems: textbook / V.Y. Labay. - Lviv: Lviv Polytechnic Publishing House, 2021. - 340 p. 2. Labay V.Y. Heat and mass transfer. - Lviv: Triada plus, 2004. - 260 p. 3. Labay V.Y. Examples and problems from the course of heat and mass transfer: textbook manual / V.Y. Labay. - Lviv: Lviv Polytechnic Publishing House, 2017. - 228 p. 4. Electronic educational and methodical complex (id=6786) "Heat and mass transfer processes in HGSV systems" for students of the specialty "Heat and gas supply and ventilation" in the virtual educational environment of Lviv Polytechnic University, 2022. (certificate No. 04718). https://vns.lp.edu.ua/course/view.php?id=6786. 5. https://www.twirpx.com/file/917343/ 6. http://dspace.nuft.edu.ua/jspui/bitstream/123456789/6932/3/04%20Vasylenko%20Osnovu%20teplomasoobminu.pdf 7. https://ir.lib.vntu.edu.ua/bitstream/handle/123456789/8043/%D0%A7%D0%B5%D0%BF%D1%83%D1%80%D0%BD%D0%B8%D0%B9%20%D0%A2%D0%B5%D0%BF%D0%BB%D0%BE%D0%BC%D0%B0%D1%81%D0%BE%D0%BE%D0%B1%D0%BC%D1%96%D0%BD.pdf?sequence=4&isAllowed=y 8. https://vlp.com.ua/node/18425 9. www.pidruchniki.com.
Уніфікований додаток: Lviv Polytechnic National University ensures the realization of the right of persons with disabilities to obtain higher education. Inclusive educational services are provided by the Service of accessibility to learning opportunities "Without restrictions", the purpose of which is to provide permanent individual support for the educational process of students with disabilities and chronic diseases. An important tool for the implementation of the inclusive educational policy at the University is the Program for improving the qualifications of scientific and pedagogical workers and educational and support staff in the field of social inclusion and inclusive education. Contact at: Karpinsky str., 2/4, 1st educational building, room 112. E-mail: nolimits@lpnu.ua Websites: https://lpnu.ua/nolimits https://lpnu.ua/integration
Академічна доброчесність: The policy regarding the academic integrity of the participants of the educational process is formed on the basis of compliance with the principles of academic integrity, taking into account the norms "Regulations on academic integrity at the Lviv Polytechnic National University" (approved by the academic council of the university on June 20, 2017, protocol No. 35).