冷库制冷技术知识(Cold storage refrigeration technology knowledge)

冷库制冷技术知识（Cold storage refrigeration technology

knowledge）

The cold storage refrigeration technology knowledge.Txt9 love is a drop of dew, kiss the dry soil, rain it with warmth, with a diamond firm, looking forward to the flashing light of the broken soil fertility; a freezing point of love in life is not, it is a flowing river, the river makes our life beautiful scene. Cold storage refrigeration technology knowledge

Cold storage refrigeration technology knowledge

Refrigeration refers to the use of refrigeration equipment to remove heat from a limited space to reduce the temperature to the desired level. This process is done by * heat transfer. Some commonly used terms for refrigeration are briefly described as follows:

1.1 temperature

The temperature is used to represent the material of heat and cold, the degree of temperature of the available thermometer to measure, such as the glass thermometer, the liquid in the pipe after the heat expansion, the liquid level rises, the cooling shrinkage, low liquid level, the liquid level of said level temperature. Here are a brief description of several standards for temperature values.

A. Celsius under standard pressure, the freezing point of water as 0 degrees, the boiling point as 100 degrees, in 0 and 100 degrees between the equilibrium moment into 100 lattice, each

lattice is l degrees, with the symbol C said.

B. Fahrenheit under standard pressure, the freezing point of water is 32 degrees, and the boiling point is between 212 degrees and two balanced carved into 180 lattice, each lattice is l degrees, to sign oF.

C. Kelvin (also called Kelvin) to the Celsius scale as the basis, to the freezing point of water is 273.16 degrees, the boiling point of water is 373.16 degrees, the theory of material molecular movement to stop all points as 0 degrees, with the symbol K said.

The commonly used scale is Celsius, Fahrenheit, kelvin. The conversion formulas between them are as follows:

Fahrenheit centigrade:

China's Celsius conversion:

Kelvin's relation to celsius:

T= T + 273.16

Type: T: Kelvin, K; t: oC Celsius.

1.2 calories

The temperature of an object indicates the degree of thermal motion of the material molecule, and the temperature also indicates the energy level of the object. This energy is called

heat energy. When the temperature of two different objects in contact, the temperature gradually tends to be uniform, the heat transfer from high temperature to low temperature of the object object, the object emits and absorbs the heat energy is called. The commonly used units of heat are:

A. under normal atmospheric pressure, l grams of water heating or cooling, and its temperature rise or decrease l degrees centigrade, the added or removed heat is called l card, expressed in symbolic cal. The clamping unit is too small, the project often uses 1000 times to represent kcal or kcal. The symbol is kcal.

B. British thermal units under standard pressure, 11b (LB) (11b = 0.454kg) water heating or cooling, the temperature is increased or decreased L oF degrees Fahrenheit, added or removed from the heat is called a British thermal unit, the symbol is Btu.

C. Joule

In the international system of units, the unit of heat is equal to the unit of work, expressed in joule. Joule is equivalent to the action of 1N (Newton) force, the moving point of a common moving point, moving L, m (meters) in the direction of force. Therefore, in the international system of units, Joule is the unit of work and energy, the use of such units to simplify the calculation, Joule's symbol is J. Our legal unit of heat is joule.

The conversion between Joule and card is: