Heat and Mass Transfer
... Insulations are used to decrease heat flow and to decrease surface temperatures. These materials are found in a variety of forms, typically loose fill, batt, and rigid. Even a gas, like air, can be a good insulator if it can be kept from moving when it is heated or cooled. A vacuum is an excellent i ...
... Insulations are used to decrease heat flow and to decrease surface temperatures. These materials are found in a variety of forms, typically loose fill, batt, and rigid. Even a gas, like air, can be a good insulator if it can be kept from moving when it is heated or cooled. A vacuum is an excellent i ...
A Heat Transfer Textbook by John H. Lienhard IV and John H
... The development of fossil energy sources has been a bit like Jules Verne’s description in Around the World in Eighty Days in which, to win a race, a crew burns the inside of a ship to power the steam engine. The combustion of nonrenewable fossil energy sources (and, more recently, the fission of uran ...
... The development of fossil energy sources has been a bit like Jules Verne’s description in Around the World in Eighty Days in which, to win a race, a crew burns the inside of a ship to power the steam engine. The combustion of nonrenewable fossil energy sources (and, more recently, the fission of uran ...
Single-sided Natural Ventilation: Design Analysis
... Typically, the energy cost of a naturally ventilated building is 40% less than that of an air-conditioned building [5]. Natural ventilation, therefore, contributes to a sustainable environment by reducing energy use in buildings. Recent surveys have suggested that some building occupants prefer spac ...
... Typically, the energy cost of a naturally ventilated building is 40% less than that of an air-conditioned building [5]. Natural ventilation, therefore, contributes to a sustainable environment by reducing energy use in buildings. Recent surveys have suggested that some building occupants prefer spac ...
Commissioning tools for improved energy performance
... The demands of building users regarding the environment are growing. We all request a comfortable and healthy indoor environment but we do not accept any more excessive use of natural resources and pollution of outdoor environment. The energy consumption and the energy costs should indeed be kept on ...
... The demands of building users regarding the environment are growing. We all request a comfortable and healthy indoor environment but we do not accept any more excessive use of natural resources and pollution of outdoor environment. The energy consumption and the energy costs should indeed be kept on ...
WP5 Best practice guidelines report v17final
... The potential for energy savings and improvements in indoor climate is often high for modern office buildings. Many modern office buildings may have a lower energy use for heating, but on the other hand often have a higher use of electricity than older office buildings, due to a higher energy use fo ...
... The potential for energy savings and improvements in indoor climate is often high for modern office buildings. Many modern office buildings may have a lower energy use for heating, but on the other hand often have a higher use of electricity than older office buildings, due to a higher energy use fo ...
Geothermal
... Range geothermal systems will benefit today’s power plant and direct-use developers. The basic thermal gradient data were collected over 15 years ago under a different development objective - large (multi-km square) areas with temperatures exceeding 200°C. Most exploration effort at that time sought ...
... Range geothermal systems will benefit today’s power plant and direct-use developers. The basic thermal gradient data were collected over 15 years ago under a different development objective - large (multi-km square) areas with temperatures exceeding 200°C. Most exploration effort at that time sought ...
An energy efficient building for the Arctic climate
... the building envelope and it creates problems with the foundation due to the permafrost. The solar pattern is completely different due to the limited availability in winter, yet, in summer, the sun is above horizon for 24 hours. Furthermore, the sunrays reach the vertical opaque elements at shallow ...
... the building envelope and it creates problems with the foundation due to the permafrost. The solar pattern is completely different due to the limited availability in winter, yet, in summer, the sun is above horizon for 24 hours. Furthermore, the sunrays reach the vertical opaque elements at shallow ...
cocoon cellulose insulation and the systems
... Holes in the thermal boundary allow unwanted heat gain during the summer and heat loss during the winter. Typical problem areas are knee walls, stairs on exterior walls, vaulted ceilings, tubs or tub and shower stalls, and utility shafts. No Compression Insulation achieves its full R-value only when ...
... Holes in the thermal boundary allow unwanted heat gain during the summer and heat loss during the winter. Typical problem areas are knee walls, stairs on exterior walls, vaulted ceilings, tubs or tub and shower stalls, and utility shafts. No Compression Insulation achieves its full R-value only when ...
View - OhioLINK Electronic Theses and Dissertations Center
... Director of Thesis: Adil Sharag-Eldin Recent research estimates that windows are responsible for 39% of commercial heating energy use and 28% of commercial cooling energy use; this is equivalent to almost 1.5% of the total U.S. energy consumption (Apte and Arasteh, 2006). In addition, the commercial ...
... Director of Thesis: Adil Sharag-Eldin Recent research estimates that windows are responsible for 39% of commercial heating energy use and 28% of commercial cooling energy use; this is equivalent to almost 1.5% of the total U.S. energy consumption (Apte and Arasteh, 2006). In addition, the commercial ...
Local Heat Transfer Coefficients Measured with Temperature
... arithmetic or as the harmonic mean of the local heat transfer coefficients, depending on whether the boundary condition is a constant temperature or a constant heat flux, for which the mean heat transfer coefficient is lower. An emphasis in this study is laid on plate heat exchangers; distributions ...
... arithmetic or as the harmonic mean of the local heat transfer coefficients, depending on whether the boundary condition is a constant temperature or a constant heat flux, for which the mean heat transfer coefficient is lower. An emphasis in this study is laid on plate heat exchangers; distributions ...
Sustainable refurbishment of exterior walls and building facades
... heating demand can be studied with a dynamic simulation. It is however possible to estimate roughly the effect of the insulation on the heating demand with simple stationary calculation techniques such as the heating degree day method, this gives an upper limit value on the possible energy saving. T ...
... heating demand can be studied with a dynamic simulation. It is however possible to estimate roughly the effect of the insulation on the heating demand with simple stationary calculation techniques such as the heating degree day method, this gives an upper limit value on the possible energy saving. T ...
2002 Lyman ETFS
... louvered fin geometry, assessing the performance based on an effectiveness-NTU (number of transfer units) or on an LMTD (log-mean-temperature difference) is not applicable. Instead, this study evaluates different reference temperatures to scale the heat transfer coefficients to gain an understanding ...
... louvered fin geometry, assessing the performance based on an effectiveness-NTU (number of transfer units) or on an LMTD (log-mean-temperature difference) is not applicable. Instead, this study evaluates different reference temperatures to scale the heat transfer coefficients to gain an understanding ...
Unsteady coupled convection, conduction and radiation simulations
... In the aeronautical industry, energy generation relies almost exclusively in the combustion of hydrocarbons. The best way to improve the efficiency of such systems, while controlling their environmental impact, is to optimize the combustion process. With the continuous rise of computational power, s ...
... In the aeronautical industry, energy generation relies almost exclusively in the combustion of hydrocarbons. The best way to improve the efficiency of such systems, while controlling their environmental impact, is to optimize the combustion process. With the continuous rise of computational power, s ...
Unsteady coupled convection, conduction and radiation simulations
... In the aeronautical industry, energy generation relies almost exclusively in the combustion of hydrocarbons. The best way to improve the efficiency of such systems, while controlling their environmental impact, is to optimize the combustion process. With the continuous rise of computational power, s ...
... In the aeronautical industry, energy generation relies almost exclusively in the combustion of hydrocarbons. The best way to improve the efficiency of such systems, while controlling their environmental impact, is to optimize the combustion process. With the continuous rise of computational power, s ...
Table of Contents
... in understanding the principles of electric thermal systems and components as they apply to various heating tasks. Its purpose is to give you theory, general calculations and engineering data along with examples for solving heating problems. This Application Guide is not a how-to manual or a substit ...
... in understanding the principles of electric thermal systems and components as they apply to various heating tasks. Its purpose is to give you theory, general calculations and engineering data along with examples for solving heating problems. This Application Guide is not a how-to manual or a substit ...
SCHAUM`S OUTLINE OF THEORY AND PROBLEMS OF HEAT
... text and/or (2) a supplemental aid for students taking a college course in heat transfer at the junior or senior level. To fulfil1 these dual roles, there are several factors that must be considered. One of these is the long-standing argument over the nature of treatment, that is, mathematical deriv ...
... text and/or (2) a supplemental aid for students taking a college course in heat transfer at the junior or senior level. To fulfil1 these dual roles, there are several factors that must be considered. One of these is the long-standing argument over the nature of treatment, that is, mathematical deriv ...
Ventilative Cooling
... The IEA co-ordinates research and development in a number of areas related to energy. The mission of one of those areas, the EBC - Energy in Buildings and Communities Programme, is to develop and facilitate the integration of technologies and processes for energy efficiency and conservation into hea ...
... The IEA co-ordinates research and development in a number of areas related to energy. The mission of one of those areas, the EBC - Energy in Buildings and Communities Programme, is to develop and facilitate the integration of technologies and processes for energy efficiency and conservation into hea ...
Energy performance of buildings — Calculation of energy use for
... ISO 13790 was prepared by Technical Committee CEN/TC 89, Thermal performance of buildings and building components, the secretariat of which is held by SIS, in cooperation with Technical Committee ISO/TC 163, Thermal performance and energy use in the built environment, Subcommittee SC 2, Calculation ...
... ISO 13790 was prepared by Technical Committee CEN/TC 89, Thermal performance of buildings and building components, the secretariat of which is held by SIS, in cooperation with Technical Committee ISO/TC 163, Thermal performance and energy use in the built environment, Subcommittee SC 2, Calculation ...
Heat Transfer
... 1. Introduction Energy is defined as the capacity of a substance to do work. It is a property of the substance and it can be transferred by interaction of a system and its surroundings. The student would have encountered these interactions during the study of Thermodynamics. However, Thermodynamics ...
... 1. Introduction Energy is defined as the capacity of a substance to do work. It is a property of the substance and it can be transferred by interaction of a system and its surroundings. The student would have encountered these interactions during the study of Thermodynamics. However, Thermodynamics ...
2004 Lethander AIAA
... Many of the past studies on secondary flow effects have focused on the aerodynamic penalties resulting in total pressure losses through a stage. Arguably as important, however, are the thermal penalties resulting in reduced airfoil life. This is particularly true because increased turbine inlet temp ...
... Many of the past studies on secondary flow effects have focused on the aerodynamic penalties resulting in total pressure losses through a stage. Arguably as important, however, are the thermal penalties resulting in reduced airfoil life. This is particularly true because increased turbine inlet temp ...
Energy-Constrained Open-System Magmatic
... O’Hara, 1995, 1998), although characterizing the geochemical evolution of a magma in detail, neglect important constraints imposed by energy conservation, the thermodynamics of partial melting, and the dynamics of melt extraction and magma mixing. In the model developed here and applied to a number ...
... O’Hara, 1995, 1998), although characterizing the geochemical evolution of a magma in detail, neglect important constraints imposed by energy conservation, the thermodynamics of partial melting, and the dynamics of melt extraction and magma mixing. In the model developed here and applied to a number ...
PDF
... Carnot made theoretical headway by treating only a very restricted class of heat engines, though he still avoided invoking particular properties of the working substance. The following were the most important of Carnot's restrictions. (1) Carnot only treated engines that worked through a cyclical p ...
... Carnot made theoretical headway by treating only a very restricted class of heat engines, though he still avoided invoking particular properties of the working substance. The following were the most important of Carnot's restrictions. (1) Carnot only treated engines that worked through a cyclical p ...
Residential Attic Ventilation In A Hot And Humid Climate
... The reality of the effect of natural ventilation in a residential attic cavity has been the topic of many debates and scholarly reports since the 1930’s. The purpose of ventilating an attic cavity is to prevent collection of condensate on the structural surfaces, and to create a thermal buffer betwe ...
... The reality of the effect of natural ventilation in a residential attic cavity has been the topic of many debates and scholarly reports since the 1930’s. The purpose of ventilating an attic cavity is to prevent collection of condensate on the structural surfaces, and to create a thermal buffer betwe ...
Thermal Envelope Performance
... transmission, supporting structural loads, and providing an aesthetically pleasing appearance. Although building envelopes are generally successful in meeting these requirements, there are cases in which they do not perform adequately. Shortcomings in thermal performance are manifested by excessive ...
... transmission, supporting structural loads, and providing an aesthetically pleasing appearance. Although building envelopes are generally successful in meeting these requirements, there are cases in which they do not perform adequately. Shortcomings in thermal performance are manifested by excessive ...
“Heat and Mass Transfer.” The CRC Ha - Ewp.rpi.edu
... In this equation, α is the thermal diffusivity, and q· G is the internal heat generation per unit volume. Some problems, typically steady-state, one-dimensional formulations where only the heat flux is desired, can be easily solved using Equation (3.1.1). Most conduction analyses are performed with ...
... In this equation, α is the thermal diffusivity, and q· G is the internal heat generation per unit volume. Some problems, typically steady-state, one-dimensional formulations where only the heat flux is desired, can be easily solved using Equation (3.1.1). Most conduction analyses are performed with ...