1st Edition

Heat Pump Dryers Theory, Design and Industrial Applications

By Odilio Alves-Filho Copyright 2016
    345 Pages 115 B/W Illustrations
    by CRC Press

    Explore the Social, Technological, and Economic Impact of Heat Pump Drying

    Heat pump drying is a green technology that aligns with current energy, quality, and environmental concerns, and when compared to conventional drying, delivers similar quality at a lower cost. Heat Pump Dryers: Theory, Design and Industrial Applications details the progression of heat pump drying—from pioneering research and demonstration work to an applied technology—and establishes principles and theories that can aid in the successful design and application of heat pump dryers.

    Based on the author's personal experience, this book compares heat pump dryers and conventional dryers in terms of performance, quality, removal rate, energy utilization, and the environmental effect of both drying processes. It includes detailed descriptions and layouts of heat pump dryers, outlines the principles of operation, and explains the equations, diagrams, and procedures used to form the basis for heat pump dryer dimensioning and design. The author also proposes the use of heat pump dryers that operate on natural fluids and considers their potential for providing ecological benefits and easing environmental issues relative to conventional drying. The use of natural fluids in heat pump dryers is consistent with the Kyoto and Montreal Protocols.

    Highlights includes coverage of:

    • Single-stage and multi-stage vapor compression heat pumps for drying
    • A dryer design utilizing single-stage vapor compression heat pumps
    • Design of a two-stage vapor compression heat pump for drying green peas and aromatic leaves
    • Psychrometry of humid air and includes the various types of humidification processes
    • Thermodynamic properties of refrigerants for heat pumps

    Heat Pump Dryers: Theory, Design and Industrial Applications discusses the ready-to-use technology of heat pump drying. The book compares conventional and heat pump drying, addresses the confines and limitations of conventional drying, and proposes viable solutions using this novel process.

    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 -