Difference Between Latent Heat And Sensible Heat Pdf

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20.01.2021 at 04:53
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difference between latent heat and sensible heat pdf

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Sensible heat is the heat that causes an object to change temperature. Latent heat is the heat the heat added to an object in order for it to change state. All natural substances can change state; solids become liquids ice turns into water and liquids can turn in gasses water turns into vapour when heat is added removed from them.

When an object is heated, its temperature rises as heat is added. The increase in heat is called sensible heat. Similarly, when heat is removed from an object and its temperature falls, the heat removed is also called sensible heat. Heat that causes a change in temperature in an object is called sensible heat. All pure substances in nature are able to change their state.

Difference Between Latent Heat and Sensible Heat

Latent heat also known as latent energy or heat of transformation is energy released or absorbed, by a body or a thermodynamic system , during a constant-temperature process — usually a first-order phase transition. Latent heat can be understood as energy in hidden form which is supplied or extracted to change the state of a substance without changing its temperature. Examples are latent heat of fusion and latent heat of vaporization involved in phase changes , i. The term was introduced around by British chemist Joseph Black. It is derived from the Latin latere to lie hidden. Black used the term in the context of calorimetry where a heat transfer caused a volume change in a body while its temperature was constant.

Latent heat

Latent heat , energy absorbed or released by a substance during a change in its physical state phase that occurs without changing its temperature. The latent heat associated with melting a solid or freezing a liquid is called the heat of fusion ; that associated with vaporizing a liquid or a solid or condensing a vapour is called the heat of vaporization. The latent heat is normally expressed as the amount of heat in units of joules or calories per mole or unit mass of the substance undergoing a change of state. Because the heat of vaporization is so large, steam carries a great deal of thermal energy that is released when it condenses, making water an excellent working fluid for heat engines. Latent heat arises from the work required to overcome the forces that hold together atoms or molecules in a material. The regular structure of a crystalline solid is maintained by forces of attraction among its individual atoms, which oscillate slightly about their average positions in the crystal lattice.

Two types of heat are important in air conditioning. These include:. Sensible heat is heat exchanged by a thermodynamic system that changes the temperature of the system without changing some variables such as volume or pressure. As the name implies, sensible heat is the heat that you can feel. The sensible heat possessed by an object is evidenced by its temperature. As temperature increases, the sensible heat content also increases. However, for a given change in sensible heat content, all objects do not change temperature by the same amount.

The design cooling load or heat gain is the amount of heat energy to be removed from a house by the HVAC equipment to maintain the house at indoor design temperature when worst case outdoor design temperature is being experienced. The sensible cooling load refers to the dry bulb temperature of the building and the latent cooling load refers to the wet bulb temperature of the building. For summer conditions the humidity influence on the selection of the HVAC equipment and the latent load as well as the sensible load must be calculated. Notice that below grade walls, below grade floors, and floors on concrete slabs do not increase the cooling load on the structure and are therefore ignored. Other sensible heat gains are taken care of by the HVAC equipment before the air reaches the rooms system gains. Two items that may require additional sensible cooling capacity from the HVAC equipment are.

Latent and Sensible Heat

Sensible heat is literally the heat that can be felt. It is the energy moving from one system to another that changes the temperature rather than changing its phase. For example, it warms water rather than melting ice. In other words, it is the heat that can be felt standing near a fire, or standing outside on a [[sunny day.

Latent heat and sensible heat are two forms of energy that are used in explaining the relationship between the temperature and matter. These terms have many applications in our day to day life. The latent heat is the transfer of energy from or to a system during a phase transition of matter.

The coastal landscape of Antarctica is dominated by fierce winds that originate over the continental interior, introducing cold, dry air to a relatively warmer and moister atmospheric boundary layer ABL at the outlet of glacial valleys. Coastal polynyas are formed when this strong off-continental flow pushes ice offshore, leaving an area of open water or thin sea ice adjacent to the coast. As cold and dry air is advected over the polynya, the ensuing large ocean—atmosphere temperature and humidity differences can lead to large sensible and latent heat fluxes SHF and LHF, respectively.

Latent and sensible heat are types of energy released or absorbed in the atmosphere.


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Rod C.
22.01.2021 at 21:25 - Reply

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