Sunday, February 24th, 2019

Exergy analysis of an isothermal heat pump dryer

Publication year: 2011brbSource:/b Energy, In Press, Corrected Proof, Available online 12 April 2011brWill, Catton , Gerry, Carrington , Zhifa, SunbrA numerical simulation of a plate contact-type isothermal heat pump dryer (HPD) is used to examine the energy efficiency improvement obtainable from this system compared with a conventional HPD. While we consider this system design to be entirely feasible, we are not aware of any existing practical applications of the design. The simulation incorporates a detailed plate, product and air flow model, solving the mass, momentum and energy balances within the drier, into a pre-existing model of the remaining HPD components. The accuracy of an idealised drier-duct model used in a previous analysis is assessed. Although the accuracy of the…br Highlights: ► Numerical simulation is used to assess energy efficiency benefit of a novel heat pump drying (HPD) configuration, called ICHPD. ► Validation of the model includes comparison with measured data and idealised analytical solutions for the standard and ICHPD configurations. ► The energy efficiency benefit associated with ICHPD is shown to be a factor of between 2 and 3. ► Exergy analysis shows that ICHPD reduces refrigerant-cycle irreversibilities and condenser-product heat transfer irreversibilities by roughly equal amounts. ► An economic case study shows that ICHPD provides an opportunity to reduce economic risk associated with uncertain energy prices.

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