Thermodynamic analysis of PID temperature controlled heat pump system

Ali Etem Gürel, İlhan Ceylan
2014 Case Studies in Thermal Engineering  
In the current research, a heat pump fluidized bed dryer a with PID temperature control was designed. Drying air temperature was determined as 40 1C and it was controlled through this system with 70.36 1C uncertainty. The designed and manufactured PID controlled heat pump dryer was analyzed by drying the plants of mint, parsley and basil. These analyses included the energy analysis, energy utilization ratio, exergy analysis and uncertainty analysis. In this system, drying air velocity was
more » ... velocity was changed depending on the set temperature. As the set temperature increased, drying air velocity decreased as well. Drying air velocity varied from min 1.01 to max 7.4 m/s. Therefore, energy utilization ratio (EUR) in the fluidized bed dryer was changed during the drying period between 16% and 90%. The whole system heating coefficient of performance (COP ws ) was calculated as an average of 1.91.
doi:10.1016/j.csite.2013.11.002 fatcat:mp476lronbbnbokcvw2obpjqym