Research And Application On The Remote Intelligent Monitoring System Of Air-source Heat Pump Water Heater

The technology of air-source heat pump water heater is one of the mostpromising new energy technologies. It is based on the principle of reverse Carnotcycle, driven by a small amount of electrical energy. It shifts low heat in the air to theheated water to product high-grade domestic hot water and heating hot water withrefrigerant just as carrier. It is not only safe but also energy-saving as well asenvironmental protection, and has great potential of development and application.Currently, many electronics manufacturers have launched a series products ofair-source heat pump water heater. It is mainly used in commercial or civilian siteswhich are in demand of plenty of hot water. There are usually several units and coverrelatively large areas, therefore, the units and control cabinets are usually installed onthe roof. So it is very inconvenient for the operator to observe and control theoperating parameters of the units with control cabinets. The temperature setting ofwater and the start-stop control of defrost operation is usually artificially. It is morelikely to cause unnecessary action which leads to the loss of units and waste energy,reduces the effectiveness of energy saving. To solve these problems, the paperresearches the data communication mode and control technology of air-source heatpump water heater, and proposed a remote intelligent monitoring system of air-sourceheat pump water heater units. Details are as follows:Analyzed the influence of water temperature settings and control method ofdefrost operation for heating performance of air-source heat pump water heater units.The results show that the closer the temperature of water is set to the actual demand,the higher the heating performance of the units is. When the defrost operation starts,the more accurate of the evaporator frosting conditions are determined, the higher theenergy efficiency is, and the lower the defrosting loss is.Accordingly, the paper proposed to use fuzzy control algorithm in order torealize the remote intelligent control of temperature settings and defrost operationinstead of the traditional manual control. Established the fuzzy control model based on LabVIEW, it determines the setting temperature based on the outdoor temperatureand its variation, determines the probability of frosting based on the outdoortemperature and the interval time of defrost operation to control the start and stop ofdefrost.Studied the master-slave communication mechanism of air-source heat pumpwater heater units, and format of the data frame which contains the operatingparameters form the control board. Accordingly developed a graphical PC monitorinterface using LabVIEW, it can monitor the change of operating parameters and theworking status of load. And combined fuzzy control operation to the monitoringsystem to improve the integration of the system.Test results and practical applications show that the system is stable and security,as well as energy saving, it has broad application prospects and promotional value.