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Energy Today
Published in Anco S. Blazev, Global Energy Market Trends, 2021
Work is act of energy change. According to the first law of thermodynamics, the change in total internal energy of a system equals the added heat minus the work performed by the system. δE=δQ−δW
What is energy?
Published in Kornelis Blok, Evert Nieuwlaar, Introduction to Energy Analysis, 2020
Kornelis Blok, Evert Nieuwlaar
Many conversions exist between these various forms of energy. The first law of thermodynamics, also called the law of conservation of energy, states that energy can neither be created nor destroyed, but can only be converted from one form to another (or from several forms combined to one or more other forms). This well-known law is one of the most fundamental laws in the natural sciences. It also forms the basis for energy analysis, and is implicitly used in many types of analysis, for example in energy statistics.
Thermal Mass Flowmeters
Published in Michael A. Crabtree, The Concise Industrial Flow Measurement Handbook, 2019
In its simplest form a hot body (a heated wire, thermistor, or resistance temperature detector [RTD]) is placed in the main stream of the flow (Figure 12.1). According to the first law of thermodynamics, heat may be converted into work and vice versa. Thus, the electrical power (I2R) supplied to the sensor is equal to the heat convected away from it.
Research on the usability of various oxygenated fuel additives in a spark-ignition engine considering thermodynamic and economic analyses
Published in Biofuels, 2023
Murat Kadir Yesilyurt, Battal Dogan, Abdülvahap Cakmak
Exergy specifies the quantity of the work potential of energy existing in any thermodynamic condition. According to the first law of thermodynamics, energy is conserved; to put it more clearly, the law of conservation of energy states that energy cannot be created or destroyed, but can only be transformed from one form to another. However, in contrast to energy conversion, exergy is not conserved and it is destroyed as a result of irreversibilities existing in the system. The study and use of clean alternative fuels for SI engines are of great importance in relieving the shortage of petroleum resources and environmental issues caused by fossil fuel burning. Therefore, alternative fuels for SI engines continue to be the subject of research efforts. Exergy analysis gives more valuable and detailed information than energy analysis about thermal systems, determining the exergy destruction and identifying its location, thus offering overall improvement in efficiency and playing a significant role in reducing the environmental impact caused by the investigated systems [31].
Second law analysis of the 160 Wp standalone solar photovoltaic system
Published in International Journal of Sustainable Energy, 2019
Ranjeet Kumar Jha, Avadhesh Yadav, Durgesh Sharma
According to the first law of thermodynamics, energy is neither created nor destroyed; it can be only converted from one form to another. The first law of thermodynamics deals with the quantity of energy, and it is independent of environment parameters. Total incident energy on the SPV modules is converted into electric as well as thermal energy (Lavan, Monnier, and Worek 1982). The electrical energy is high-grade energy whereas thermal energy is low-grade energy; the conversion efficiency of electrical to mechanical energy is around 99.99% whereas that of thermal energy to mechanical energy is around 40%. The amount of solar energy falling on the SPV modules is given byQin is the amount of solar energy falling on SPV modules, IR is the intensity of solar radiation falling on module area, Amod is the area of SPV module.