Simulation Of Annual Energy Consumption About Variable Refrigerant Volume Systems

Evaluation of energy consumption is necessary for the design of building energy saving .The method of energy consumption calculation about the variable refrigerant volume systems is estimate method at this stage. Therefore, it is important that the method of energy consumption about VRV will be researched. In this thesis, The calculating method of energy consumption for VRV is obtained through the method of fitting sample data and simulating mathematical model of refrigeration cycle.Using sample parameters about unit and theoretical knowledge research major factors affecting the COP of variable refrigerant volume systems in actual operation, the outdoor air temperature and indoor load.Using least square method to fit out the performance curve equation about the summer and winter operating conditions, and then using Simulink dynamic simulation to verify it.When the units in actual operation, energy consumption can be further calculated with the data of COP.The energy consumption calculated is based on indoor load and outdoor temperature. Dest software is used to calculate hourly loads of office building whose name is teaching and research center in Qingdao, and the load value is regard as an input data.The outdoor temperature used in this paper is provided by Dest software. On this basis, by studying the relationship between wet and dry bulb temperature, the author calculates the hourly wet bulb temperature for calculating air-conditioning energy consumption in winter conditions.The software of energy consumption is programmed with Matlab, furthermore, it is package released as a visual interface. Using this software to calculate the operating costs of VRV that be used an existing building, compared with the costs of heating, come to focus on the higher costs of heating.Using VRV in public building will be save costs.