Energy balance - Citizendia

Energy balance has the following meanings in several fields:

In physics, energy balance is a systematic presentation of energy flows and transformations in a system. Physics (Greek Physis - φύσις in everyday terms is the Science of Matter and its motion. In Physics and other Sciences energy (from the Greek grc ἐνέργεια - Energeia, "activity operation" from grc ἐνεργός Theoretical basis for an energy balance is the first law of thermodynamics according to which energy cannot be created or destroyed, only modified in form. In Physics, thermodynamics (from the Greek θερμη therme meaning " Heat " and δυναμις dynamis meaning " Energy sources or wave of energy are therefore inputs and outputs of the system under observation.

In biology, total body energy balance is measured with the following equation: Energy intake = internal heat produced + external work + energy storage. Foundations of modern biology There are five unifying principles The Dynamic Energy Budget theory makes explicit use of energy, mass and time balances. Dynamic Energy Budget (DEB theory aims to identify simple quantitative rules for the organization of Metabolism of individual organisms that can be understood from basic first A mass balance (also called a material balance is an application of Conservation of mass to the analysis of physical systems One Calorie (or kilogram calorie) equals the energy needed to increase the temperature of 1 kg of water by 1 °C. This article is about the unit of energy For its use in Nutrition and Food labelling regulations, see the article on Food energy. This is about 4. 184 kJ. The joule (written in lower case ˈdʒuːl or /ˈdʒaʊl/ (symbol J) is the SI unit of Energy measuring heat, Electricity

In energy economics, the energy balance of a country is an aggregate presentation of all human activities related to energy, except for natural and biological processes. Energy economics is a broad scientific subject area which includes topics related to supply and use of Energy in societies. National energy balances are compiled on at least an annual basis. Common methodology for compilation and presentation of energy balances allows simple addition of national energy balances to form supranational ones, such as is compiled for the European Union. The European Union ( EU) is a political and economic union of twenty-seven member states, located primarily in United Nations compile energy balances for all member countries. The United Nations ( UN) is an International organization whose stated aims are to facilitate cooperation in International law, International security International Energy Agency, a specialised agency of OECD is regularly preparing world energy balances. The International Energy Agency ( IEA, or AIE in Romance languages) is a Paris -based intergovernmental organization founded by the Organisation

In engineering, energy balances are used to quantify the energy used or produced by a system. Engineering is the Discipline and Profession of applying technical and scientific Knowledge and This can be used to build complex differential equation models to design and analyze real systems. A differential equation is a mathematical Equation for an unknown function of one or several variables that relates the values of the To make an energy balance for a system is very similar to making a Mass balance but there are a few differences to remember, e. A mass balance (also called a material balance is an application of Conservation of mass to the analysis of physical systems g. 1) that a specific system might be closed in a mass balance sense, but open as far as the energy balance is concerned and 2) that while it is possible to have more than one mass balance for a system there can be only one energy balance. If a balance is made for total energy, the energy balance becomes IN=OUT+ACC (where ACC stands for accumulation). Notice that there is no production (PROD) term since energy can not be produced, only converted. If instead some kinds of energy are ignored, e. g. if a heat balance is made the energy balance becomes IN+PROD=OUT+ACC (if heat is consumed the PROD term is negative, compare Mass balance. A mass balance (also called a material balance is an application of Conservation of mass to the analysis of physical systems

When comparing fuel production, energy balance is the difference between the energy produced by 1 kg of the fuel (i. Fuel is any material that is burned or altered in order to obtain energy In Physics and other Sciences energy (from the Greek grc ἐνέργεια - Energeia, "activity operation" from grc ἐνεργός e. biodiesel, petroleum, uranium ) and the energy necessary to produce it (extraction (e. Biodiesel refers to a non-petroleum-based Diesel fuel consisting of short chain Alkyl ( Methyl or ethyl) Esters made by Petroleum ( L petroleum, from Greek πετρέλαιον, lit Uranium (jʊˈreɪniəm is a silvery-gray Metallic Chemical element in the g. drilling or cultivation of energetic plants), transportation, refining etc). Other factors affect fuel selection, such as portability. See also net energy gain and EROEI. See also EROEI (Energy Return on Energy Invested Net Energy Gain ( NEG) is a concept important in Energy economics, referring to a In Physics, Energy economics and ecological energetics, EROEI (Energy Returned on Energy Invested ERoEI, EROI (Energy Return On

In geography, specifically climatology and hydrology, the "'energy balance'" refers to the total of all energy inputs and outputs at any location; these include solar, atmospheric transfer, and ground conducted energy. Geography (from Greek γεωγραφία - geografia) is the study of the Earth and its lands features inhabitants and phenomena Climatology (from Greek grc κλίμα klima, "region zone" and grc -λογία -logia) is the study of Climate, scientifically Hydrology (from Greek Yδωρ hudōr, "water" and λόγος logos, "study" is the study of the movement distribution and quality of

In groundwater and groundwater flow the energy balance of a groundwater body is the balance of incoming hydraulic energy associated with inflow into the body, energy associated with the outflow, energy associated with conversion into heat due to friction of flow, and the resulting change of energy status or groundwater level. Groundwater is Water located beneath the Ground surface in Soil pore spaces and in the Fractures of lithologic formations Groundwater models are computer models of Groundwater flow systems and are used by Hydrogeologists Groundwater models are used to simulate and predict See also Groundwater energy balance. The groundwater energy balance is the energy balance of a Groundwater body in terms of incoming hydraulic energy associated with groundwater inflow into the body

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