| As a kind of unconventional free water resources in the large steam water,air conditioner condensate contains abundant water and cold quantity.At present,China's water resources are scarce and unevenly distributed,and the building area in urban and rural areas has increased significantly,further increasing the proportion of energy consumption in building operation;and with the development of industry and urbanization,people's living standards have improved,and the use of central air conditioners and urban residents'air conditioners has further increased.As a by-product of air conditioner use,the water and cold resources contained in air conditioner condensate are still not used efficiently,and the design of condensate recycling in various regions has not set corresponding standards,and its characteristics have not been explored in detail.In response to this phenomenon,this thesis conducts a detailed study of the characteristics of air conditioning condensate generation and proposes for the first time a new idea of dual utilization of air conditioning condensate cooling and water.Firstly,an office building in Jinan with a construction area of 10,000m~2was used as an example to determine the influencing factors of condensate generation and analyze the amount of air conditioning condensate generation under different relative humidity and operating conditions.The results show that:under the same setting conditions,for every 5%decrease in indoor relative humidity,the amount of air conditioning condensate generation increases by306-227 kg per unit moment;the amount of air conditioning seasonal condensate generation varies greatly when the fresh air is in different operating states,and the amount of air conditioning seasonal condensate generation decreases by 262.19 t when the amount of fresh air and outdoor meteorological parameters change hour by hour compared with the constant amount.Secondly,we calculate the amount of cold water generation during the air-conditioning season in each provincial capital city,verify the relationship between the amount of generation and the climate zone in which it is located,classify the zones according to the amount of condensate generation,and propose recovery suggestions.It is found that the amount of condensate generation during the air-conditioning season varies among provincial capitals due to the number of cooling days and the climate zone in which they are located,with more hot summer and cold winter areas being rich areas;central and some cold areas in north China being the next most common areas;and cold areas in northwest China,severe cold areas and mild areas being less common areas and scarcity areas,but recycling is still recommended.Then,in order to determine the difference between the actual amount of condensate generated and the theoretical calculated value,the amount of condensate generated at each moment during the working hours of an office without fresh air was tested and collected,and the relationship between the amount of condensate generated under different fresh air standards and the actual amount generated on that day was calculated and analyzed.In addition,the condensate temperature of the air conditioner was tested throughout the day and briefly analyzed for its temperature variation,and its water quality was tested and its application sites were understood based on the test results.The experimental results showed that the actual test value of air conditioning condensate was 71.06%of the calculated value of standard fresh air per capita and 73.36%of the calculated value of infiltration fresh air.The actual amount of fresh air entering the room is much lower than the per capita standard value and the calculated infiltration fresh air volume;the average temperature of air-conditioning condensate discharged indoors and insulated throughout the day is 16.5?;the detected quality of air-conditioning condensate is high and can be used directly as cooling water,toilet flushing water and irrigation water,but further treatment is needed to prevent eutrophication of water bodies when used as landscape water.Finally,the idea of dual recycling of condensate cooling and water recovery is proposed for the first time,and an air conditioning condensate dual utilization device is designed.The size and number of the device are initially designed in combination with the set office building scale,and the optimal size and number of heat exchange plates in the heat exchange part of the device are determined through simulations,and the heat exchange effect is simulated.At the same time,the effect of cold recovery under different inlet flow rates of condensate was investigated,and finally,the cost of the unit was analyzed economically.The simulation results show that:when the size of heat exchanger plate is 0.2m×0.5m,the best effect is to set5 pieces;when the inlet flow rate is 0.1m/s,the final outlet temperature of air conditioning condensate is 22.84?,the temperature difference between import and export reaches 6.34?,and the recyclable cold capacity of the whole building is 2.73k W;when the inlet flow rate is reduced by 40%,the outlet temperature of condensate increases by 0.61?,and the recycling rate of cold capacity increases by 10%.The cold volume that can be recycled during the air-conditioning season is calculated to be equivalent to a 1-hp air conditioner,and the recovered water volume can take up 12.31%of the water consumption of the whole office building or 20.52%of the water consumption of toilet flushing.Combined with the cost calculation of its investment payback period of 3.86 years,the overall project is feasible. |
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