Further Research And Utilization Analysis Of "design Meteorological Year"

Under the background of building energy saving,it is necessary to save energy of HVAC.Load calculation as the source of design,it to a large extent determines whether the system is energy efficient.Therefore,it is urgent to find a reasonable load calculation method.The load calculation method mainly includes the static load calculation method and the dynamic load calculation method,the former includes cooling load coefficient method,the steady-state calculation method,and index method,the latter is mainly using the software to realize dynamic load simulation.But current static load calculation method has many problems,including: the thermal characteristics of enclosure structure is not considered enough,without considering the influence of "simultaneous" of outdoor design parameters and the fixed hour(date)does not meet the design requirements,not only can not provide the load distribution of air conditioning or heating season,but also guide the unit selection according to the regulation of part load.While the dynamic load simulation must have a reasonable hourly meteorological parameters,that current commonly used "typical meteorological year" data are average,it based on the simulated hourly load,use its results as design load will make unit long time can not meet requirement of thermal comfort.Therefore,it is necessary to develop a kind of meteorological year data,which is used to simulate the design load,and use result to guide selection and unit operation.The "original design meteorological year" constitute purpose is to solve the above problems,but the data also exist many problems,first take hourly extreme value and then replace the not guarantee time is wrong,leading to extreme cold heat load is too low(high).The "original design meteorological year" in the replacement of not guarantee time with only single temperature as the basis,replace extreme time not within 8760 hours,this causing the result is not reliable.Therefore,based on the improved "original design meteorological year",To use MATLAB programming to generate a "new design meteorological year" in different city,and compare "original design meteorological years " with " typical meteorological year ".Then discovery that "new design meteorological year" and " original design meteorological year " have higher monthly daily average temperature and monthly mean total radiation than " typical meteorological year ".the individual abnormal phenomenon because extreme load moment is determined by the A plurality of meteorological parameters.DeST is used to simulate the load of typical buildings in different cities,and the hourly load is simulated by using three kinds of meteorological data.Most city each month with "new design meteorological year" and "original design meteorological year" to simulate the extreme cold and hot load to be higher than "typical meteorological year",this is because the former reflects is certainly no guarantee rate under extreme load conditions.Further compare "new design meteorological year" with "typical meteorological year" simulation results,It will be found that most of month the "new design meteorological year" have higher cold and hot extreme load value,but there is also have abnormal phenomena,such as extreme cold load in Chongqing August 7 and Beijing August for "typical meteorological year" is higher,the main reason is that "typical meteorological year" constitution unit will weaken the extreme load,while the moisture content on hourly extreme load moment is too high,resulting in " typical meteorological year " part of the hourly load is high,so the author put forward the direction of improvement for " typical meteorological year ",including: update and optimize the unit to weeks or days and hours,then to determine the weight ratio of each meteorological parameter under fact.In the other hand the simulated extreme load of "original design meteorological year" is beyond the reasonable range,the simulation results are not reliable.The hourly load of different cities under different meteorological data is also compared,It is found that in the hourly load distribution simulated by the new design meteorological year,the number of hours in the high load interval is larger,and the number of hours in the low load interval is less.the " typical meteorological year " is on the contrary,this is because the "typical meteorological year" is used for simulating load distribution of the region's climate,and " new design meteorological year" is used for simulating load distribution of certain situation does not guarantee the hourly rate under extreme load.In different cities,we have make a comparison between "new design meteorological year" simulate selection load(extreme load)with Hongye calculated load,and it is found in summer Hongye calculate cooling load is small,while in winter the " new design meteorological year " simulate selection heat load is small.The reason is the basic data to determine the parameters of the outdoor is too old,with the recent warming,Hongye outdoor design temperature and humidity is relatively low,and the outdoor design parameters are determined independently,without considering the influence of meteorological parameters on the extreme load produced at the same time.Propose control function of minimum hourly power consumption base on hourly load,using "fmincon" function to make program,Chongqing "new design meteorological year" simulated cooling load is 446 k W,the building model should be selected large unit refrigerating capacity is 320 k W,small unit refrigerating capacity is 126 k W.In the premise of size unit has been selected,according to the hourly cooling load and the "fmincon" function control minimum hourly power consumption,obtained hourly units conditions of load distribution,therefore,the optimal control method of unit in the air conditioning season is obtained,and compared with the traditional method of starting by stages,it is concluded that compare optimal control strategy with starting by stages,the former consumes about 10265 kWh in the whole air conditioning season,and the percentage of energy saving is 9.4%.