1、 Overview:
Refrigeration and cryogenics is an applied technology, which combines scientific research with engineering very strongly, and can be used for further study or deep cultivation of engineering technology.
At present, new technologies are slowly emerging in this field, and it is important to accumulate experience, which has been illustrated by many outstanding works published by experts, scholars or engineers.
Many new comers are not familiar with some common tools or software in the refrigeration industry. Today, our editor will give you new colleagues an inventory of some small software or tools you need to master or learn in the refrigeration industry:
2、 Cartography
For young people who just started their career, it may be strange that, as a talent in refrigeration system design, how should I learn to draw?
In fact, CAD drawing is one of the necessary skills for design and engineering talents. Only when basic drawing skills are mastered, can system schematic diagrams be drawn; Only in this way can we better show the things we want to design to the leaders intuitively and clearly;
Drawing also includes 2D drawing and 3D drawing. It is suggested that you should master 2D drawing!
Common software is as follows:
2D: AutoCAD, CAXA, etc;
3D: Solidworks, Pro/E, UG, etc;
3、 Thermodynamic calculation of refrigeration system
1. Physical property query
Refrigerant software includes Refprop (Reference Fiuld PROPerties), which is developed by the National Institute of Standards and Technology (NIST). It mainly focuses on industrial fluids and their compounds, especially mixtures of refrigerants and hydrocarbons, including thermodynamic characteristics and flow characteristics of working fluids. Relevant data and charts can be called through programming, such as MTALAB.
Refig is a Chinese interface:
Wet air parameter query
2. Pressure enthalpy diagram software:
(1) Refprop, the pressure enthalpy diagram is as follows:
(2) Solkane, the pressure enthalpy diagram is shown below:
(3) Excel, the pressure enthalpy diagram is as follows:
3. Refrigeration system cycle calculation:
（1）Coolpack；
This software is one of the most practical software for thermodynamic calculation of refrigeration system, which can be used for thermodynamic calculation of single-stage steam compression system, two-stage compression system, etc;
(2) Solkane design software:
(3) Excel for thermodynamic calculation of refrigeration system
4、 Compressor selection
The commonly used compressors on the market now have their own selection software; For example, the common Bezel compressor:
There are also common Danfoss compressors:
And the compressor of the grain wheel:
For compressors of other brands, peers can search online by themselves. Generally, common brands have their own selection software;
5、 Heat exchanger design:
Heat exchanger software includes The (Luvata's), EVAP-COND (NIST's), Coildesigner (Maryland University's), HTRI (Heat Transfer Research Corporation of the United States), etc. See the instructions for use. Before using HRTI, you can read Qian Songwen's "Heat Exchanger Design Manual". EVAP-COND and Coildesigner can both simulate and calculate the condenser performance under a given air speed or air volume.
（1）. The design software
There are inlet air temperature and humidity, air volume, inlet and outlet water temperature and other parameters in The, so the cooling capacity can be checked by changing the coil parameters (and the condenser performance can also be calculated). After meeting the space required for drainage, wiring, base, top cover, etc., reasonably determine the coil size and reserve a certain margin. The number of coil circuits is appropriate to ensure the pressure drop of working medium.
(2) Evap Cond design software:
EVAP-COND can calculate the heat dissipation of the traditional finned copper tube condenser under the input structural parameters and working conditions, the outlet temperature and pressure of refrigerant, the outlet temperature of air, etc., but if the pressure drop on the air side cannot be calculated, the resistance curve of the condenser pipe network cannot be made, and the working points of the fan and condenser cannot be found from the calculation results. It can visually represent the flow path.
（3）. Coildesigner software:
Coildesigner has a correlation to calculate the pressure drop, which can be used to determine the working point of the fan and condenser, but the process needs to be manually adjusted, until the calculated pressure drop at the air side under the input air volume is very close to the static pressure of the fan, it is considered that the calculation result is the air volume and static pressure at the working point of the fan. Coildesigner determines evaporation temperature and condensation temperature according to this iterative method.
（4）. HTRI heat exchanger design software
HTRI is more professional in heat exchange. According to the structural module, it can be used for air cooler, economizer, plate exchanger, tube shell sleeve, spiral plate, hairpin tube shell, pipe laying tool, vibration analysis, burner shell tube heat exchanger example. The resistance of pipe, pipe accessories and other equipment should be reasonably selected to ensure that the total resistance is within the specified range
(5) Shell and tube heat exchanger design software
(6) Plate heat exchanger software
6、 Design and selection of other components:
Type selection of throttle/expansion valve:
Danfoss and Emerson have their own selection software, which can be used directly;
You can also use Excel to integrate the parameters of each expansion valve, and then select the model:
Design calculation of suction and exhaust pipe diameter:
(1) Excel can be used to calculate:
(2) Calculate with Solkane:
(3) Selection of other auxiliary parts
We can use the selection software of various brands. We take Danfoss as an example:
