| With the wide use of split air conditioning in summer,the proportion of air conditioning power consumption to total building energy consumption is becoming larger and larger.As the condensate water produced by air conditioning operation contains a certain amount of cooling capacity,how to recycle and utilize the cooling capacity is bound to play a significant role in improving air conditioning performance.In this paper,a method of reducing air temperature around air conditioning condenser by using condensate water to improve air conditioning performance is proposed,and experimental and simulation research is carried out.Firstly,it is concluded that the condensate water produced by 1P air conditioning is1.436 kg/h through theoretical analysis and calculation,which can reduce the condenser inlet air temperature by 5.22℃ and increase the energy efficiency ratio of the air conditioning by 18% when it evaporates completely.In this paper,three types of condensate atomization cooling elements including cylindrical type,disk type and embedded type,have been developed and designed.The axial displacement and particle size of water mist generated by three types of atomization cooling elements have been experimentally studied by means of high-speed camera.The experimental results show that the atomization effect,processing method and application mode of the disk type atomization cooling element are better than those of the other two types.The traditional split air conditioning is reformed,including adding disk type atomization cooling element in the outdoor unit,changing the installation direction of the fan and so on,and the performance of the air conditioning before and after the reform is tested in an enthalpy difference chamber.The test results showed that the energy efficiency ratio of the traditional air conditioning will be reduced by 25% when the outdoor environment changes from the standard operating condition to the maximum operating condition;when the airflow direction changes from exhaust to blow under the standard operating condition,the energy efficiency ratio of the air conditioning will be reduced by10.4%,and the introduction of atomizing cooling elements will reduce the energy efficiency ratio of the air conditioning by 0.9%.When the condensate water is used through the atomization cooling element,the maximum air temperature at the outlet side of the condenser can be reduced by 3.6 ℃,and the energy efficiency ratio of the air conditioning can be increased by 13.9%.Secondly,the three-dimensional model of the split air conditioning condenser is established to simulate the effects of air temperature and flow rate,evaporation rate of condensate water and air flow direction on the temperature and velocity field of air around the condenser,the maximum temperature of the condenser surface and the air conditioning performance.The simulation results show that the maximum temperature on the condenser surface increases with the increase of outdoor air temperature and decreases with the increase of air flow rate;the energy efficiency ratio of air conditioning increases from 3.00 to 3.65 when the evaporation rate of condensate water changes from 10% to 100%;When the air flow direction is changed from exhaust to blow,the air temperature and velocity field on the outlet side of condenser are more uneven,and the energy efficiency ratio of air conditioning before and after modification is increased from 3.28 to 3.38.Finally,two structural improvement schemes of "U" type tube-fin condenser and non-equidistant tube-fin condenser are proposed.The simulation results show that both of the two schemes can improve the uniformity of air temperature and velocity field around the condenser under the condition of air blow,and increase the energy efficiency ratio of air conditioning by 1.7% and 5.1% respectively.The research results of this paper provide theoretical basis for how to use condensate water to improve air conditioning performance in the future. |
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