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HEAT TRANSPIRATION [3 records]

Record 1 2007-03-11

English

Subject field(s)
  • Spacecraft
DEF

A material, especially a coating material, designed to provide thermal protection to a body in a fluid stream through loss of mass.

OBS

Ablating materials are used on the surfaces of some reentry vehicles to absorb heat by removal of mass, thus blocking the transfer of heat to the rest of the vehicle and maintaining temperatures within design limits. Ablating materials absorb heat by increasing in temperature and changing in chemical or physical state. The heat is carried away from the surface by a loss of mass(liquid or vapor). The departing mass also blocks part of the convective heat transfer to the remaining material in the same manner as transpiration cooling.

French

Domaine(s)
  • Engins spatiaux
DEF

Matériau spécial recouvrant un astronef et qui peut être sacrifié (entraîné, emporté, évaporé) au cours des opérations de rentrée dans l'atmosphère de la Terre. L'énergie cinétique se dissipe et prévient l'échauffement excessif de la structure principale de l'astronef.

Spanish

Save record 1

Record 2 2000-01-31

English

Subject field(s)
  • Botany
  • Living Matter - General Properties
DEF

"Heat of respiration". Process by which oxygen and carbohydrates are assimilated by a substance; also when carbon dioxide and water are given off by a substance.

CONT

Peat moss, sphagnum etc. used for packing roots should be new and clean. Seedlings at the stage of active growth may rot by respiratory heat or overmoisture from transpiration. Adequate use of packing material is important for these kinds of plants.

CONT

Tomatoes destined for distant markets or tomatoes in the pink or light red stage should be cooled immediately after harvest to avoid becoming overripe before reaching the consumer. Placing containers of warm tomatoes in a refrigerated space, known as room cooling, is recommended. To aid room cooling and prevent the buildup of heat of respiration, containers of tomatoes should be loosely stacked with space between the containers to allow for sufficient air circulation.

French

Domaine(s)
  • Botanique
  • Propriétés générales de la matière vivante
CONT

Chaleur de respiration : certains produits vivants comme les fruits et légumes continuent à vivre malgré le fait qu'ils soient entreposés. Nous pouvons connaître la quantité de BTU émis grâce à des chartes [...] En fait, le gain de BTU émis dans la chambre par le phénomène de chaleur de respiration est fonction du type de produits, mais aussi de la température d'entreposage.

OBS

La respiration [est une] réaction [qui] libère de l'énergie utilisable par la plante. La respiration se manifeste extérieurement par l'existence de deux flux gazeux : pénétration d'oxygène et rejet de gaz carbonique. L'intensité respiratoire se mesure par le volume d'oxygène absorbé ou de gaz carbonique dégagé par la plante [...]

Spanish

Save record 2

Record 3 1976-06-19

English

Subject field(s)
  • Mechanical Components

French

Domaine(s)
  • Composants mécaniques
OBS

bull. inst. int. froid, TLI, no 5, 1971, p. 1302 -1303 RA

Spanish

Save record 3

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