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Calculation of refrigeration equipment in supermarket refrigerated showcase (3)
calculation of refrigeration equipment in supermarket refrigerated showcase (3)
2) The selection of single-unit two-stage refrigeration compressors calculates the ratio of the theoretical air volume of the single-unit two-stage refrigeration compressors produced in our country is certain, and its working temperature range is -25～-50℃, condensation temperature is 30～40 ℃. When selecting the model, it can be approximated with reference to the working conditions. In the actual engineering design, according to the load and design conditions, the refrigeration capacity of the compressor under the design conditions can also be found from the compressor performance curve to determine the type and number of compressors. The selection principle of the single-unit two-stage refrigeration compressor is the same as that of the matched two-stage refrigeration compressor.
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refrigerated showcase Condenser selection The purpose of the condenser selection calculation is to determine its heat transfer area through thermal calculations and heat transfer calculations, so as to select a suitable condenser. And through fluid dynamic calculation to determine the flow of the cooling medium and the resistance loss flowing through the condenser, so as to select the capacity and power of the pump or fan. When choosing a condenser, you must consider the local water source, investment and maintenance costs.
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selection calculation of air-cooled and water-cooled condenser The flow resistance loss. The selection and calculation of the evaporative condenser will be introduced separately.
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determination of the condenser heat transfer area
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condenser heat load fleece. This refers to the total heat (in kW) discharged by the refrigerant vapor in the condenser. In general, it includes the heat absorbed by the refrigerant in the evaporator and the heat converted by the mechanical work obtained during the compression process.
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resistance calculation of condenser cooling water vertical condenser and sprinkling waterThe cooling water of the type condenser is flowed down the pipe wall by gravity from the top, so there is no need to calculate the flow resistance. The fans and pumps required for forced convection air-cooled condensers and evaporative condensers have been configured by the manufacturer, so there is no need to select them separately in the project. The cooling water pump of the shell and tube horizontal condenser needs to be carried out in the engineering design Optional, for this, the flow resistance of the cooling water needs to be calculated to provide the necessary data for the optional pump. First, according to the selected model, find out the water resistance loss of the condenser at a given flow rate (or water speed) and water flow number from the product sample. In the absence of this data, the number of heat transfer tubes, the diameter of the tubes, the length of each tube and the number of water flows in the condenser can be found. Cooling
selection and calculation of evaporative condensers The design of high-efficiency evaporative condensers needs to consider many factors, such as supermarket refrigerated showcase diameter, length, tube spacing, refrigeration The flow direction of the agent, the flow of air, the amount of spray water, and the size of the box. In addition, it is necessary to consider the heat exchange between the refrigerant and the tube wall when the refrigerant is condensed, and the heat and mass exchange between the water film outside the tube and the air.
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