Maintenance debugging refrigeration equipment, these refrigeration knowledge you need to know~
1, cold tons (RT)
Air conditioning and refrigeration units, cold tons, also known as refrigerated tons, refrigerated tons refers to the energy required to freeze a ton of water into ice. (Note: 1 cold ton is to make 1 ton of 0 degrees Celsius water in 24 hours to 0 degrees Celsius ice required by the amount of refrigeration.) 1 ton of 0 degrees Celsius water, the ability to convert into 0 degrees Celsius ice within 24 hours, the freezing ton indicates the refrigeration capacity of the freezer.
2, power (W)
Power is the work done by an object in a unit of time, that is, power is a physical quantity that describes the speed of doing work. The amount of work is certain, the shorter the time, the greater the value of power. The formula for finding power is power = work/time. Use power to describe the speed of work, the amount of work done per unit time is called power.
3.Pressure-enthalpy diagram
The pressure-enthalpy diagram is a map of the refrigerant, which indicates the thermodynamic properties of the refrigerant (pressure, temperature and pressure). Temperature. Heat, etc.), pressure-enthalpy diagram draws a refrigeration cycle refrigerant state changes, according to the diagram can be calculated. According to this diagram, the cooling capacity can be calculated, the heat of condensation, and the operation status of the refrigeration equipment can be determined.
4.Enthalpy-Humidity diagram
Enthalpy and humidity diagram indicates the relationship between the air parameters of the line diagram. Enthalpy and humidity diagram is like a dictionary, you can look up the word (other parameters of air) according to the pinyin (a parameter).
5.Refrigerant thermal property table
The table of thermal properties of refrigerant lists the temperature (saturation temperature) and pressure (saturation pressure) and other parameters of the refrigerant in the saturated state. Refrigerant temperature and pressure in the saturated state is - a corresponding.
What is saturation? Refrigerant gas and liquid coexistence state. Gas-liquid equilibrium, the gas is called saturated vapor; liquid is called saturated liquid; pressure is called saturated vapor pressure; temperature is called saturation temperature. The refrigerant in the evaporator, condenser, gas-liquid separator, and low-pressure recirculation drum is generally considered to be in a saturated state. In the saturated state of the vapor (liquid) is called saturated vapor (liquid), the corresponding temperature and pressure is called saturation temperature and saturation pressure.
6, condensing temperature
The condensing temperature of the compressor system, is the temperature of the refrigerant in the condenser condensation, the temperature corresponding to the refrigerant vapor pressure that is the condensing pressure. Condensing temperature is one of the main operating parameters of the refrigeration cycle, for the actual refrigeration device, due to other design parameters change range is small, the condensing temperature can be said to be the most important operating parameters, which is directly related to the refrigeration effect of refrigeration devices, safety and reliability and energy consumption level.
7.Evaporating temperature
Evaporation temperature refers to the temperature of the refrigerant in the evaporator evaporation boiling, which corresponds to the corresponding evaporation pressure, evaporation temperature is also an important parameter in the refrigeration system. It reduces every 1 degree, the same amount of cold need to increase the power of 4%, so in the conditions permit, appropriate to improve the evaporation temperature, to improve the efficiency of the refrigeration system is favorable, but not the lower the better.
Evaporation temperature in the ideal state that is the refrigeration temperature, but the actual operation of the refrigerant evaporation temperature than the refrigeration temperature is slightly lower than 3 to 5 degrees.
8, suction temperature
Suction temperature refers to the refrigerant into the compressor temperature, it is generally higher than the evaporation temperature. Because the evaporating temperature is the saturation temperature of the refrigerant, while the suction temperature is the temperature of the superheated gas, when the refrigerant becomes superheated gas. The difference between the suction temperature and evaporation temperature is the suction superheat.
9.Superheat
Superheat is defined as the temperature difference between the low-pressure side and the vapor in the temperature-sensitive package. Measurement of superheat in the location as close as possible to the sensing package to measure the evaporating pressure, and will be converted to temperature readings, and then use the sensing package of the actual temperature measured at the temperature minus the temperature. The degree of superheat should be between 5 and 8°C.
10.Subcooling degree
Definition of subcooling: the difference between the saturated liquid temperature corresponding to the condenser condensing pressure and the actual temperature of the condenser outlet liquid.
Engineering, the exhaust pressure is generally approximated as the condensing pressure, the exhaust pressure corresponding to the saturated liquid temperature and the condenser outlet liquid temperature difference, as the degree of subcooling. The reason for this approximation is that the pressure drop of the condenser is relatively small compared to the evaporator. For air-cooled condenser, 3 to 5 degrees of subcooling is more appropriate. Refrigeration system normal cycle, the condenser outlet will generally have a certain degree of subcooling.
11, suction superheat
Suction if there is no superheat, there may be back to the gas with liquid, or even cause wet stroke liquid damage to the compressor. In order to avoid this phenomenon, a certain degree of suction superheat is needed to ensure that only dry steam into the compressor. Too high a degree of superheat also has the disadvantage of high superheat will cause the compressor exhaust temperature (exhaust superheat) increases, the compressor operating conditions deteriorate life reduced. Therefore, the suction superheat should be controlled within a certain range.
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Our company mainly produces products for:Fin Evaporator.Fin Type Condenser.Capillary Tube.Aluminum Coolant Reservoir.Plate Reinforcement Parts.Stamped Parts.Aluminum Tube.Instrument Testing Equipment.
Supermarket Refrigeration Show Case Copper Condenser Coil
1. OEM or ODM can be accepted
2. Fin type: Louver or corrugated
3. Be customerized according to samples and drawings.
4. High quility and low price and energy saving 60% (CE, RoHS, EMC and ISO9001 certification) The CD series products can be used in Various specificantion Condensing Units .
