Research On The Optimization Of A New Heat Pump In Drying Noodles

The traditional heat pump system for drying noodles has many problems,such as auxiliary electric heating,low COP of the system,and stagnant fluid,which lead to fluctuations in parameters such as temperature and humidity in the drying room.This paper proposes two optimization schemes for the shortage of traditional heat pump drying noodle system,and uses the 500 kg wet noodle drying process as the research entry point.Through theoretical analysis,system simulation and comparative analysis,the heat pump drying system in the two optimization schemes is analyzed.Analysis of the performance characteristics of the heat pump into the form of a better heat pump drying system for noodle drying.This paper first designs the noodle drying room,and uses ANSYS software thermal analysis module to establish the transient heat transfer model of the drying room envelope structure.The loads of the winter and summer through the envelope structure,as well as the heat and humidity load of the entire drying room The analysis shows the dynamic change curve of the drying room load in winter and summer.Based on the load calculation,MATLAB numerical analysis calculation software is used to simulate the design of each component of the system in the two optimization schemes,and then a simulation calculation model is established for the entire heat pump system.Through simulation calculations,it can be obtained that during the heat pump drying of the improved heat pump drying system,the average SMER in the pre-drying stage is higher than the average SMER in the main drying stage regardless of winter or summer.Throughout the drying process,the average SMER in summer in the pre-drying stage and the main drying stage is higher than the average SMER in winter,and the SMER in the completed drying stage is basically equal to that in summer.Throughout the drying process,the average SMER in summer was 2.89,and the average SMER in winter was2.79.The average SMER in summer is 3.6% higher than in winter.For the heat pump drying system of fixed frequency and variable frequency combined operation,three combinations of one fixed frequency and one variable frequency system,two fixed frequency and one variable frequency system,and two fixed frequency and two variable frequency systems are proposed..During the whole noodle drying process of the three frequency conversion heat pump drying systems,the average SMER values of the summer system are: 4.47,4.78,3.47,and the average SMER values of the winter system are: 4.57,4.85,3.43.In the three heat pump drying stages in winter and summer,the SMER of two fixed frequency and one variable frequency heat pump drying systems are larger than the other two variable frequency heat pump drying systems.And referring to the COPs of the systems of the three variable frequency heat pump drying systems,the optimal combination scheme of the heat pump drying system for the combined operation of the variable frequency and fixed frequency is determined: two fixed frequency and one variable frequency combined heat pump drying system.The two optimized systems are compared,that is,the performance parameters of the improved heat pump drying system and two fixed-frequency and one frequencyconverted heat pump drying systems are compared.The average SMER and COP of the two fixed-frequency and one frequency-converted heat pump drying systems during the entire drying stage in winter and summer are greater than the average SMER and COP of the improved heat pump drying system.The power consumption and auxiliary heat exchange capacity of the compressor in each drying stage in winter and summer.The improved heat pump drying system is larger than the two fixed frequency and one variable frequency heat pump drying system.The large amount of auxiliary heat exchange and the power consumption of the compressor indicate that the energy saving effect is poor,energy is wasted,and the overall performance of the heat pump drying system is affected.After analyzing this paper,the optimal heat pump drying system form for drying noodles is determined as follows: two fixed-frequency and one frequency conversion combined heat pump drying system.