Study On The Outdoor Design Temperature For Winter Air-conditioning And "Unsatisfactory Days For Average Year" Of Indoor Temperature

In the calculation stage of HVAC system,outdoor calculation parameters are indispensable."Civil Building Heating Ventilation and Air Conditioning Design Standard"(GB50736-2012),"should be used in outdoor calculated temperature of air conditioning in winter average does not guarantee that 1 day of daily average temperature".Generally,30 years of data statistics,namely 30 years of average annual indoor temperature can not guarantee the designer’s expected thermal comfort.Thus,it can basically satisfy the comfort of people’s indoor thermal environment in winter,and ensure that the designed air conditioning system will not bring too much energy consumption.When calculating outdoor parameters of HVAC,the statistical method of "unguaranteed rate" is based on outdoor meteorological data due to the actual conditions.Default "outdoor" does not guarantee that time is past people "indoor is not satisfied with the time",but because of palisade structure thermal inertia effect,indoor and outdoor temperature has significant differences in theory and reality.Design the winter heating load calculation using the steady state calculation method,Without considering the wall temperature wave attenuation caused by the thermal inertia and delay,the influence of the winter indoor thermal environment of air conditioning room no satisfaction is far less than in the norms of "calendar year" is no guarantee that one day on average,so deviation and deviation from the specification as originally envisioned.Increase the energy consumption of the air-conditioning system.For the same meteorological data,it is necessary to distinguish between the design and calculation temperature obtained by the same non-guarantee rate of indoor and outdoor.Outdoor calculated temperature of air conditioning in winter,for example,when "indoor average dissatisfied" 1 days,the corresponding outdoor is greater than the standard of "average does not guarantee days" "average does not guarantee" in 1 day."Outdoor calendar year does not guarantee the number of days" increases,the winter air conditioning outdoor calculation temperature increases,the construction load decreases,brings certain energy-saving benefit.Therefore,it is necessary to study the influence of heat storage characteristics on indoor temperature.The author selects fan-coil plus new fan form of air conditioning system,the winter air conditioning room 1987-2016,a total of 30 years of indoor "calendar year average days not satisfied",the method of air conditioner outdoor calculated parameters provide guidance advice,to make it more reasonable,ultimately achieve the desired interior "average not happy days".First to natural room temperature simulation of construction,natural room temperature simulation there is no heating of the air conditioning system,refers to the buildings in outdoor weather conditions and indoor all sorts of calorific value under the joint action of caused by indoor air temperature.Found that architecture can achieve 5 ~ 6 ℃ temperature difference between indoor and outdoor.The annual average temperature change of Beijing from 1987 to 2016 was calculated,and the annual average temperature showed an upward trend.The average temperature of the month of the coldest month(January)in Beijing and the coldest day in calendar year were calculated.In order to simulate the actual "indoor unsatisfactory days" in winter air-conditioning system,and to ensure the consistency of outdoor meteorological data in the design stage of the air-conditioning system and the software simulation stage.Of Beijing original outdoor meteorological data from 1987 to 2016,according to the specification of winter outdoor air conditioning calculation parameters,the method of identified for this topic research Beijing winter air-conditioning outdoor air calculations.Found at the same time,due to the effects of climate change,1987 ~ 2016 meteorological data compiled the outdoor calculated temperature of air conditioning in winter in Beijing is 9.7 ℃,higher than the specification based on 1970 ~ 2000 in Beijing meteorological data statistics of-9.9 ℃.According to the current heating period in Beijing,the simulated winter air conditioning period is defined as November 15 to March 15.In a certain office building,for example,for indoor setting temperature 18 ℃,the winter air conditioning cooling load calculation and air conditioning system design,and the related equipment parameters were determined.Using DeST software and Beijing city from 1987 to 2016,the "average unsatisfactory days" of air conditioning room in winter air conditioning was simulated by using outdoor weather data from 1987 to 2016.According to the set temperature 18 ℃ of indoor air conditioning system,simulation of room of three represents "indoor historical average dissatisfied days" were much smaller than China’s "civil building heating ventilation and air conditioning design code(GB50736-2012)outdoor meteorological parameters in the provisions of the" average does not guarantee "1 day.Then,without changing the original building model in this paper,by changing the "outdoor don’t guarantee the number of days",the office building at room temperature for 1 day "average not satisfied",for "outdoor don’t guarantee the number of days" for five days,at this time of the outdoor calculated temperature of air conditioning in winter was 6.8 ℃,respectively.The author of the north main city of meteorological data from 1988 to 2017 statistics,obtained from city to city is suitable for the office buildings in this paper the indoor dissatisfied "calendar year 1 days,the outdoor calculated temperature of air conditioning in winter of each city.In one day of "the average outdoor don’t guarantee" and "indoor average does not meet the" 1 day two cases,the outdoor calculated temperature of air conditioning in winter from 9.7 ℃ to 9.7 ℃,in this paper,the office building for the load calculation and energy consumption simulation.The energy consumption of the air conditioning system decreased by 20.3% compared with the air conditioning system designed in the first day of the outdoor calendar year.Also,in this paper,under the condition of without changing the original building model,by changing the "outdoor does not guarantee that" days,the hotel building at room temperature for 1 day "average not satisfied",for "outdoor don’t guarantee the number of days" for 4 days,at this time of the outdoor calculated temperature of air conditioning in winter was 7.3 ℃,respectively.The author of the north main city of meteorological data from 1988 to 2017 statistics,obtained from city to city is suitable for the hotel buildings "indoor dissatisfied" calendar year 1 days,the outdoor calculated temperature of air conditioning in winter of each city.In one day of "the average outdoor don’t guarantee" and "outdoor average does not meet the" 1 day two cases,the outdoor calculated temperature of air conditioning in winter from 9.7 ℃ to 9.7 ℃,in this paper,the hotel building for the load calculation and energy consumption simulation.The energy consumption of the air conditioning system was 18.2% lower than that of the air conditioning system designed in the first day of the outdoor calendar year.