Heat Pump Dryers: Theory, Design and Industrial Applications, 1st Edition (Hardback) book cover

Heat Pump Dryers

Theory, Design and Industrial Applications, 1st Edition

By Odilio Alves-Filho

CRC Press

345 pages | 115 B/W Illus.

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pub: 2015-08-05
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Description

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.

Reviews

"… 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 -

Table of Contents

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

About the Author

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.

Subject Categories

BISAC Subject Codes/Headings:
SCI065000
SCIENCE / Mechanics / Dynamics / Thermodynamics
TEC005050
TECHNOLOGY & ENGINEERING / Construction / Heating, Ventilation & Air Conditioning
TEC012000
TECHNOLOGY & ENGINEERING / Food Science