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Heat is a quantitative measure of energy that depends on the mass of an object; temperature is a measure of energy intensity. Although heat is the waste product of electricity generation, temperature is the environmental characteristic to which organisms respond. Few energy conversion processes are carried out without heat being rejected at some point in the process stream. Historically it has been more convenient as well as less costly to reject waste heat to the environment rather than to attempt significant recovery. Concern over heat rejection arose when quantities at localized sites rose dramatically as the electric utility industry shifted to water‐cooled, thermal‐electric generating stations of high unity capacity in the 1950s. Cooling techniques, risk minimization, thermal effects, prevention of mortality, maintaining ecosystem structure and function, impingement, biocides, entrainment, gas balance, cooling‐tower chemicals, human pathogens, aquaculture, open‐field agriculture, greenhouse agriculture, animal shelters, space heating, industrial process heat, and cooling reservoirs are discussed.
Heat is a quantitative measure of energy that depends on the mass of an object; temperature is a measure of energy intensity. Although heat is the waste product of electricity generation, temperature is the environmental characteristic to which organisms respond. Few energy conversion processes are carried out without heat being rejected at some point in the process stream. Historically it has been more convenient as well as less costly to reject waste heat to the environment rather than to attempt significant recovery. Concern over heat rejection arose when quantities at localized sites rose dramatically as the electric utility industry shifted to water‐cooled, thermal‐electric generating stations of high unity capacity in the 1950s. Cooling techniques, risk minimization, thermal effects, prevention of mortality, maintaining ecosystem structure and function, impingement, biocides, entrainment, gas balance, cooling‐tower chemicals, human pathogens, aquaculture, open‐field agriculture, greenhouse agriculture, animal shelters, space heating, industrial process heat, and cooling reservoirs are discussed.
Thermal pollution is the addition of heat to water bodies by human activities, particularly by thermal electricity generating stations. This heat raises water temperatures, which can affect aquatic life in many ways, including survival, growth, activity, reproduction, and community composition. Many of these effects are sufficiently understood to indicate thermal limits for aquatic‐life protection. Efforts to control high temperatures can lead to other risks related to water use (eg, physical effects of entrainment and impingement or several effects of closed‐cycle cooling), resulting in a need to balance risks. There are potential beneficial uses of waste heat, ranging from heating buildings to warm‐water agriculture and aquaculture. With adequate planning, the location and design of power stations can maximize benefits and minimize ecological risks.
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