Simulation Study On The Regulation Of Partitioned Intermittent Heating

China's building energy consumption is increasing.According to statistics,China's building energy consumption in 2017 was about 947 million tons of standard coal.In particular,the energy consumption of heating accounts for a large proportion,and the energy consumption of heating in northern cities and towns accounts for about 24.1% of the total energy consumption of buildings.Reducing energy consumption for heating is of great significance.At present,the urban heating in China mainly adopts the centralized continuous heating method.Due to the large heating area of this heating method,there is a problem of heat supply imbalance,and the phenomenon of uneven heating and cooling of each user of the same heat source is very common.Therefore,there is an urgent need for a heating adjustment method,so that the heating system can achieve energy saving and can improve the indoor comfort of the building.A concept of district intermittent heating regulation for the uneven heating of the system is proposed in this paper,that is,the intermittent heating method is used for the superheating zone,and the residual heat of the building in the superheating zone during the shutdown period is used to supplement the supercooling zone to reduce the heating supply.Unbalance rate,so that the entire heating zone is in the thermal comfort range.The effects of different heating parameter conditions and zoned intermittent heating systems on the quality of heating in the superheated zone and subcooled zone were analyzed separately.Taking the typical residential area of Daqing as the research object,a physical model is established,the simulation parameter conditions are determined and the heating system model is established.According to the survey results of actual heating in winter in residential quarters of Daqing City,residents believe that the optimal heating temperature range is 20?23 ?,and more than half of the actual room temperature in the community in winter is not in this range,there is a serious problem of uneven heating.Buildings whose actual indoor temperature in winter is higher than the highest value of the optimal heating temperature range considered by residents are divided into overheated areas.Partitioned intermittent heating method is adopted for this type of superheated area buildings,to explore the influence of different heating parameters on the indoor thermal comfort and building energy consumption of the superheated area buildings.The results show that different heating time distributions have a greater impact on the indoor thermal environment and energy consumption of overheated buildings.The use of a cyclic heating scheme that shuts off the heat at 5 o'clock,and then heats up for another 3 hours after the heatis shut off guarantees the indoor temperature requirements in the superheated area.The heating energy consumption during the heating period is the least,which can make up the excess heat in the supercooled area the most heat.Increasing the water supply temperature,water supply flow rate and insulation layer thickness have a positive effect on improving the thermal comfort of the building,but when the water supply temperature and flow rate are increased,the energy consumption for heating increases slightly.The construction in which the actual indoor temperature of the house in winter is lower than the lowest value of the optimal heating temperature range considered by the residents is divided into overheated areas.That is,according to the optimal control plan of the superheating zone,the rich heat of the superheating zone is supplied to the supercooling zone.Explore the effect of different heating parameters on the indoor thermal comfort and wall thermal response of residential buildings in supercooled areas.The results show that: when the superheated area is the supercooled area,the ratio of the supplementary heating area is 1:1,2:1,3:1,you can increase the average indoor temperature of the supercooled area from16 ? to 17.65 ?,19.05 ?,21.02 ?.Under the condition of 2:1 heating ratio,when the water supply temperature of the heat source is 70 ?,the flow rate of the water supply is 0.5m/s or the thickness of the insulation layer is 90 mm,the indoor temperature in the superheated zone is in the thermal comfort zone for most of the time,and the indoor average in the supercooled zone The temperature can be increased by more than 1 ?,and the PMV-PPD index meets the standard.