Practice of phase transfer heat storage in warm pump drying assembly

In the drying process by adjusting the auxiliary condenser heat transfer fluid flow to maintain the drying temperature is stable, the heat transfer fluid in the auxiliary condenser thermal phase change material sliced ​​paraffin DSC test results; change after the container containing the encapsulated phase change material , The heat is passed to the phase change material, the phase change material temperature continues to rise, the final melting heat storage. At the end of the drying period, the internal water evaporation of the potato chips is mainly determined by the drying temperature, so at this stage, the compressor is switched off and the solidification of the heat of vaporization by the melted phase change material is used to maintain the stability of the drying temperature. When the drying temperature is lower than 38e, re-open the compressor to ensure the stability of the drying temperature, and has been running until the end of the drying process, the quality of the entire dry potato chips change as shown in Figure 4. Phase change material in the drying process of melting storage and curing heat release curve shown in Figure 5. Figure 3 drying temperature changes with time; in order to clearly explain the phase change material on the quality of dry goods changes, the phase change material into the drying cycle before and after the compressor and run again potato quality changes after the table listed in Table 1. Table , It can be seen that the mass change of the potato slice before the phase change material is placed in the drying system is 012g and the mass change of the dried interim item completely maintained by the exothermic heat of the phase change material is also 012g which is turned on again by the compressor It can be seen that the change of the dry mass of the article does not decrease due to the exothermic maintenance of the phase change material during the drying process.

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