Optimal Design And Experimental Study On Refrigeration Dehumidifier

During the operation of the refrigeration dehumidifier,wet air will condense to water when the temperature which near the fin surface drops below the dew point temperature.Dehumidifier decrease moisture depending on this theory.Due to simple construe and prefect effect,it is widely used in industry,agriculture and life.Predecessors have studied on refrigeration dehumidifier comprehensive and in-depth from some aspects such as the air quantity,the heat transfer structure and so on.But few people research on the perspective of evaporation temperature.Therefore,based on Dehumidification Capacity per input Power(DCPP),this paper will study on the relationship between evaporation temperature and DCPP to optimize the performance of refrigeration dehumidifier.Firstly,this paper studies on some ways about calculating DCPP and wet air parameters.Meanwhile,based on steady state,this paper makes some assumptions,and according to the refrigeration dehumidification process,the evaporation temperature is associated with DCPP.At last,a program is written to calculate DCPP conveniently.Therefore,it makes some inferences.There is a point when DCPP is maximum named optimum evaporating temperature.Secondly,experimental bench is designed and built.The experimental bench requirements,dry-bulb temperature fluctuate between ±0.3?,and wet-bulb temperatures fluctuate between ±0.2?,are fulfilled by testing in assigned environmental conditions.Meanwhile,a traditional dehumidifier system is reformed into frequency conversion systems to convenience in adjust evaporating temperature by adjusting power of compressor,pressure ratio in the restricting element and temperature of evaporating temperature.Assuredly,this change passes the pressure maintaining test and running test to demonstrate that the changed systems is running perfectly.At last,the performance of new systems is tested in the experiment bench.It can conclude that the tendency about evaporating temperature and DCPP analyzing from experiment coincide with theory.In the condition,dry-bulb temperature is 27? and relative humidity is 60%,the optimum evaporating temperature range is 4.4??8.4?.In this range,the deviation between experiment data and the theory is within ± 10%.The Optimized dehumidifier's performance,DCPP,is improved by 15%.