Abstract
Absorption heat pump (AHP) cycles provide opportunities to reduce the energy use of drying systems. However, different configurations can be conceived and the results vary. In this work, data from an existing industrial convective dryer are used as an input to simulate different heat pump cycles. Energy that is lost in the dryer exhaust can be partly recovered to reduce the total energy demand. Energetic analyses are done for three AHP cycles: type I, type II and double-lift cycle. The maximal relative energy saving compared to the original dryer is for the respective cycles equal to 20%, 11% and 15%. With quotes gathered from manufactures, a financial analysis is carried out on the implementation of a type I AHP in the system. This unique approach of an extensive energetic and financial study results in a calculated internal rate of return over ten years equal to 18%, which make the system feasible for the implementation in industrial dryers.
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