Heat Pump Dryers Theory, Design and Industrial Applications

Conventional and Heat Pump Drying: Benefits and Drawbacks
Classification of Conventional Dryers
Energy Aspects in Conventional Drying
Environment and Climate Aspects Related to Drying
Benefits and Principle of Operation of Heat Pump Drying
Single-Stage Vapour Compression Heat Pumps for Drying
Laws of Thermodynamics and the Heat Pump Cycles
Carnot Cycle
Single-Stage Vapour Compression Heat Pump as a Modified Carnot Cycle
Isentropic and Non-Isentropic Saturated Vapour Compression Heat Pump with Dry-Expansion Evaporator
Basic Vapour Compression Heat Pump with Dry-Expansion Evaporator and Drying Channels
Vapour Compression Heat Pump with Flooded Evaporator
Vapour Compression Heat Pump with Internal Heat Exchanger
Comparison and Limitations of the Single-Stage Vapour Compression Systems
Problems and Solutions
Multistage Vapour Compression Heat Pumps for Drying
Two-Stage Compression Heat Pump with Gas Intercooler
Two-Stage Compression Heat Pump with Flash Intercooler and Compressors in Parallel
Two-Stage Compression Heat Pump with Open Flash Intercooler and Compressors in Series
Two-Stage Heat Pump with Single Screw Compressor and Economiser
Two-Stage Compression Heat Pump with Closed Intercooler for Combined Sub-Cooling and Desuperheating
Two-Stage Vapour Compression Heat Pump with Open Intercooler
Problems and Solutions
Design of Single-Stage Vapour Compression Heat Pump Drying
Conventional Drying without Recirculation of the Exhaust Air
Conventional Drying with 50% Recirculation of the Exhaust Air and Constant Outlet Relative Humidity
Conventional Drying with 50% Recirculation of the Exhaust Air with Constant Absolute Humidity Difference
Heat Pump Drying in a Closed Cycle
Heat Pump Fluidised Bed Drying of Onion Flakes
Heat Pump Belt Drying of Leek Cubes
Heat Pump Stationary Bed Drying of Mushroom Slices
Heat Pump Fluidised Bed Drying of Cauliflower
Heat Pump Tunnel Drying of Salted Cod Fish
Design of Two-Stage Vapour Compression Heat Pump Drying
Two-Stage Vapour Compression Heat Pump Drying of Green Peas
Two-Stage Compression Heat Pump Drying of Aromatic Leaves
Psychrometry of Moist Air Applied to Water Removal and Energy Consumption
Main Moist Air Psychrometric Properties
Types of Psychrometric Processes
Ratio of Moisture Removal and Specific Energy Consumption
Heat Pump Specific Moisture Extraction Ratio
Problems and Solutions
Thermophysical Properties and Selection of Heat Pump Fluids
Types and Designation of Refrigerants
Selection of Heat Pump Fluids
New Heat Pump Dryers with Natural Fluids Designed at NTNU
Main Properties of Selected Refrigerants
References and Additional Readings

Biography

Prof. Odilio Alves-Filho earned his master’s and PhD degrees in mechanical engineering from the University of California, Davis, and the Norwegian University of Science and Technology, Trondheim, Norway, where he is a professor and chair for the

advanced PhD course in heat and mass transport in porous media. He is a former dean of the Faculty of Mechanical-Electrical Engineering, head of the Center of Excellence in Dewatering, and CEO of Innovative Drying Tech. He co-authored the Ramalho and Alves-Filho Model, has authored approximately 300 papers, two books and numerous book chapters, and is also the editor of eight academic proceedings.

"… has all the ingredients and attributes of a good textbook for undergraduate and postgraduate students of many different engineering branches, as well as a reference book for researchers and engineers in the field of drying. …In short, [the book] is of interest for a wide and multidisciplinary audience."
—Fábio Bentes Freire, DEQ/UFSCar, Departamento de Engenharia Química, Universidade Federal de São Carlos, São Carlos - São Paulo – Brazil

"…practical and theoretical … presents the most complete and available set of fundamental statements and procedures necessary ... makes use of the practical and correct definition of the specific moisture extraction ratio. I would study in Dr. Alves-Filho’s book over any other on the market."
—Mauri Fortes, Instituto de Educação Tecnológica - Ietec - MG -