Testing of a Condensation-type Heat Pump System for Low-temperature Drying Applications
-
Mustafa Aktaş
Abstract
A closed-type water source heat pump dryer integrated with a drying programme (DP) was designed and tested. The DP was developed using psychometric conditions of desired drying air and thermodynamic balance of heat pump. A drying algorithm was developed according to the technical specification of the dryer. Drying air temperature, relative humidity and drying air volumetric flow rate were entered from a programmable logic controller (PLC) screen. In this study, the drying of mint leaves was examined. Mint leaves were dried at different temperatures (35°C, 40°C and 45°C) and at different volumetric flow rates 300 m3/h for a velocity of 0.75 m/s and 600 m3/h for a velocity of 1.5 m/s in the PLC-controlled heat pump dryer. The relative humidity of the drying air entering the dryer chamber was kept between 13.88% and 6.81% and the two air dampers were controlled according to predetermined value. The coefficient of performance (
Nomenclature
specific heat, kJ/kg K
coefficient of heating performance for heat pump system
coefficient of heating performance for whole system
drying rate, g water/g dry matter min
mass flow rate, kg/s
drying amount, kg/h
power input, kW
heat delivered in condenser, kW
specific moisture extraction rate for whole system
programmable logic control
specific humidity, g/g
temperature, K
enthalpy, kJ/kg
velocity, m/s
moisture content, g water/g dry matter
initial wet weight, g
final dry weight, g
moisture content at time “t”, (g water/g dry matter)
equilibrium moisture content (g water/g dry matter)
initial moisture content (g water/g dry matter)
volumetric flow rate of air, m3/s
density, kg/m3
- Subscripts
condenser
compressor
fan
heat pump
inlet
inlet air
moisture production
outlet
pump
whole system
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©2014 by De Gruyter
Artikel in diesem Heft
- Frontmatter
- Grinding Characteristics of Black Soybeans (Glycine max) at Varied Moisture Contents: Particle Size, Energy Consumption, and Grinding Kinetics
- Design and Development of Low-Cost Makhana Grading and Roasting Machine
- Investigation of Consecutive Fouling and Cleaning Cycles of Ultrafiltration Membranes Used for Whey Processing
- Kinetic Models of Evaporation and Total Phenolics Degradation during Pomegranate Juice Concentration
- Predicting Sorption Isotherms and Net Isosteric Heats of Sorption of Maize Grains at Different Temperatures
- Estimating Some Physical Properties of Sour and Sweet Cherries Based on Combined Image Processing and AI Techniques
- Functional Properties of Re-fabricated Rice as Affected by Die During Extrusion Process
- Isolation and Characterization of Corncob Cellulose Fibers using Microwave-Assisted Chemical Treatments
- Physical Properties of Red Guava (Psidium guajava L.) Pulp as Affected by Soluble Solids Content and Temperature
- Levels of Fluoride in the Ethiopian and Imported Black Tea (Camellia sinensis) Infusions Prepared in Tap and Fluoride-Rich Natural Waters
- Process Optimization and Quality Analysis of Carambola (Averrhoa carambola L.) Wine
- Physical Properties of Gluten-Free Bread Made of Corn and Chickpea Flour
- In Vitro Anti-tumor Effects of Chemically Modified Polysaccharides from Cherokee Rose Fruit
- Optimization of Ohmic Heating of Fish Using Response Surface Methodology
- Response Surface Modeling for Optimization of Textural and Color Characteristics of Dried Grapes
- Response Surface Analysis for Preparation of Modified Flours using Twin Screw Extrusion Cooking
- Modeling the Effects of the Quantity and Particle Size of Wheat Bran on Some Properties of Bread Dough using Response Surface Methodology
- Testing of a Condensation-type Heat Pump System for Low-temperature Drying Applications
- Comparison of Chemical, Textural and Organoleptic Properties of Pastry Sheets with Two Different Additives
Artikel in diesem Heft
- Frontmatter
- Grinding Characteristics of Black Soybeans (Glycine max) at Varied Moisture Contents: Particle Size, Energy Consumption, and Grinding Kinetics
- Design and Development of Low-Cost Makhana Grading and Roasting Machine
- Investigation of Consecutive Fouling and Cleaning Cycles of Ultrafiltration Membranes Used for Whey Processing
- Kinetic Models of Evaporation and Total Phenolics Degradation during Pomegranate Juice Concentration
- Predicting Sorption Isotherms and Net Isosteric Heats of Sorption of Maize Grains at Different Temperatures
- Estimating Some Physical Properties of Sour and Sweet Cherries Based on Combined Image Processing and AI Techniques
- Functional Properties of Re-fabricated Rice as Affected by Die During Extrusion Process
- Isolation and Characterization of Corncob Cellulose Fibers using Microwave-Assisted Chemical Treatments
- Physical Properties of Red Guava (Psidium guajava L.) Pulp as Affected by Soluble Solids Content and Temperature
- Levels of Fluoride in the Ethiopian and Imported Black Tea (Camellia sinensis) Infusions Prepared in Tap and Fluoride-Rich Natural Waters
- Process Optimization and Quality Analysis of Carambola (Averrhoa carambola L.) Wine
- Physical Properties of Gluten-Free Bread Made of Corn and Chickpea Flour
- In Vitro Anti-tumor Effects of Chemically Modified Polysaccharides from Cherokee Rose Fruit
- Optimization of Ohmic Heating of Fish Using Response Surface Methodology
- Response Surface Modeling for Optimization of Textural and Color Characteristics of Dried Grapes
- Response Surface Analysis for Preparation of Modified Flours using Twin Screw Extrusion Cooking
- Modeling the Effects of the Quantity and Particle Size of Wheat Bran on Some Properties of Bread Dough using Response Surface Methodology
- Testing of a Condensation-type Heat Pump System for Low-temperature Drying Applications
- Comparison of Chemical, Textural and Organoleptic Properties of Pastry Sheets with Two Different Additives
