Reasearch Of Variable Air Volume Air-conditioning Billing Separately System Based On Lonworks Technology And Enthalpy Control

VAV (Variable Air Volume) central air conditioning is an air conditioningsystem to regulate indoor air state by changing the air volume. VAV technology wasborn in the1960s in the United States and began developed rapidly in Europe and theUnited States, Japan and other countries in the1980s. Tt entered my country andgradually popular in the late1990s. it is an important reason that the system hasenormous energy-saving advantages. Research of VAV air-conditioning technology isrelatively hot, but people ignored the problems of measurement of the air conditioningcosts. If you continue to use assessed act of billing based on the use of air conditioningarea, and this will make the VAV air-conditioning system itself’ green energyadvantage gone.Besides, it is not enough fair and reasonable for users.Because of the above studies, in-depth study of fan coil measurement methodsbased on heat meters and dual temperature flowmeter method, this thesis offers a newhousehold accounting schemes for the VAV system. After secondary transformation ofthe hardware and software, including of debugging networking by LonMaker andLonOPC, the charging device is realized initially by means of LonWorks experimentplatform, Intelligent Building Institute,Xi’an University of Architecture andTechnology University. In order to simulate the actual engineering situations, VAVair-conditioning system is loaded mixed air enthalpy control experiment, and we canhave a successful running of the billing system in this control process. And in the sameenvironment the auther collected the measurement data of the wind side and water sideat the same time. By comparing the wend side of the accounting scheme with thedifferences and advantages of the traditional two-temperature flow meter method, thisthesis provides a reasonable reference for next engineering and practical using.