Moisture Removal Rate Research Articles

Synergistic Effects of Initial Moisture Content and Particle Size on Drying Rate and Heat Production during Bio-Drying of Sludge after Electro-Dewatering

Electro-dewatered sludge (EDS) can be bio-dried alone, instead of adding bulking agents. The initial moisture content (IMC) and particle size of the electro-dewatered sludge affect the efficiency and energy consumption during the bio-drying process. This study aimed to investigate the synergistic effects of sludge IMC and particle size on the drying rate and heat production of bio-drying with EDS. Experiments were conducted with two different IMC sludge and two different sludge particle sizes. Results showed that the highest moisture removal rate was 43.18% in treatment T4, which had materials with a smaller particle size (<3 mm) and lower IMC (38.69%). And bio-drying of T4 had the highest biological heat production (7413.14 kJ, i.e., 741.31 kJ/kg sludge), and the lowest bio-drying index (the ratio of water loss to volatile solid loss) was 7.10 among the four treatments. Five thin-layer drying kinetic models and a nonlinear regression method were analyzed to estimate the bio-drying kinetic parameters. The Midilli et al. model had a better fitting result, and the highest R2 value was 0.9929 during bio-drying of EDS. The new coefficients k (0.1465) and n (1.0898) were obtained. Through the heat balance, the heat used for evaporation was 40–57% of the total energy consumption (5873–9140 kJ). According to the PCA, the particle size had a great influence on the bio-drying process. Also, the particle size positively correlated with temperature, moisture ratio, and drying rate.

Performance analysis of cabinet type solar dryer for ginger drying with & without thermal energy storage material

Solar energy is one of the most pay-back sources of energy. Drying provides extended shelf life to agricultural crops in general and thus proper design of dryers will assist in drying them to an acceptable level and quality. This work has been carried out with the design & Development of the solar dryer novel design of the double air pass type collector. In this work fresh Ginger is used for complete drying to prepare the Ginger powder. Nowadays ginger powder is very useful in various medicines. In this research work, 2000gm fresh ginger has been selected for drying in a cabinet solar dryer. Thermal energy storage material with good latent heat was selected to improve the dryer performance. The initial moisture content in the fresh ginger is 80 % and after drying for 2 days without thermal energy storage material moisture available finally is 9 % & weight is 288 gm. A similar experiment was carried out for ginger Drying with thermal energy storage material in a solar dryer final moisture measured is 8 % & the weight measured is 251 gm. By doing the proper literature survey Atlas wax SF 42 material is selected as energy storage material. It’s a phase change kind of energy storage material. Having a melting point of 45 °C and Latent heat of 164 Kj. The efficiency of a solar Dryer without thermal energy storage materials is calculated 45 % and with thermal energy storage materials calculated 48 %. So the 3 % improvement is there in the efficiency of solar dryer by energy storage material with 2000gm quantity of Ginger. If the quantity is more with more capacity then efficiency can be increased beyond 3 %. The outcome shows that by using the thermal energy storage material efficiency of the dryer is improved as it has a higher moisture removal rate. The designed and developed solar dryer is cost-effective and the Payback period of the solar dryer is 14 months.

Thermoultrasound and microwave-assisted freeze-thaw pretreatments for improving infrared drying and quality characteristics of red dragon fruit slices.

The effects of thermoultrasound (US-FT), microwave (MW-FT), and room temperature (RT-FT) freeze-thaw pretreatments were evaluated for improving drying kinetics and quality during infrared drying (IRD) of red dragon fruit slices (RDFS). Results indicated that microstructural alterations induced by the different pretreatments improved the moisture removal rate and effective diffusivity, and significantly reduced the drying time. US-FT pretreatments prompted more efficient drying and presented an overall enhancement in the quality of RDFS, particularly at low temperatures of 25 and 50 ℃, while enhancements in TFC, FRAP, and CUPRAC were associated with RT-FT. High-power (500 W) MW-FT pretreatments improved colour and structural properties, while low-power (100, 300 W) improved TPC, TFC, ascorbic acid, betalains, and antioxidant activity. Overall, cellular and chemical alterations prompted by pretreatments improved the drying process but presented adverse effects on betaxanthin. The study presented the fundamental background for improving the IRD of foods from the use of improved thawing approaches during freeze-thaw pretreatments.

Economic and Experimental Assessment of KCOOH Hybrid Liquid Desiccant-Vapor Compression System

A liquid desiccant dehumidification cooling system is a promising, energy-saving, high-efficiency, environmentally friendly technology that maintains thermal comfort effectively indoors by utilizing renewable energy sources or waste heat to enhance system efficiency. In this research, a small-scale (6 kW cooling capacity) hybrid liquid desiccant air-conditioning system (HLDAC) is proposed to evaluate the dehumidification performance of a non-corrosive potassium formate (KCOOH) solution. For this, four input parameters, namely, inlet air flow rate, inlet desiccant temperature, inlet desiccant concentration, and inlet specific air humidity, were selected. Moreover, the different combinations of experiments were designed by employing response surface methodology (RSM) to evaluate the dehumidification performance parameters, namely, dehumidifier latent heat load, coefficient of performance of hybrid system, and moisture removal rate (MRR). Further, a comparative performance analysis between the hybrid system and a standalone vapor compression system (VCS) unit was carried out. The result showed a remarkable increase in coefficient of performance, which was observed at about 28.48% over the standalone VCS unit. Furthermore, the economic assessment of the proposed hybrid system is presented in this paper. Finally, from the economic analysis, it was concluded that the hybrid system had a payback time of 2.65 years compared to the VCS unit.

Performance assessment and optimization of liquid desiccant dehumidifier system using intelligent models and integration with solar dryer

Realistic performance predictions are necessary to control the liquid desiccant dehumidification systems effectively. In the present study, the application of artificial intelligence (AI) based artificial neural network (ANN), gene expression program (GEP) and adaptive neuro-fuzzy inference system (ANFIS) is investigated to estimate the dehumidifier effectiveness of desiccant dehumidifier systems while considering the effect of moisture removal rate and sensible heat factor as performance characteristics. It is found that the AI-based GEP model has the best prediction capability compared to the other developed AI models. In addition, the sensitivity analysis of independent parameters on the system performance parameters is estimated using the cosine amplitude method. The results demonstrate that the inlet desiccant temperature and specific humidity have a more substantial influence on the dehumidifier effectiveness and sensible heat ratio. Further, an algorithm involving the combination of multi-objective particle swarm optimization (MOPSO) with the GEP model is developed to optimize the input process parameters and to achieve better dehumidification performance. Lastly, based on obtained optimal operating conditions, a case study on a dehumidifier-integrated solar dryer is proposed for food/agriculture products drying applications using AI-based GEP-MOPSO model. It is also observed that the inlet water temperature and solar intensity have a significant impact on the useful heat gain of the solar collector.

Experimental studies on drying characteristics of green chilies in a solar dryer

Green and clean technology is the demand of today’s world. Solar dryer, for drying agriculture produce is one of the major applications of the solar energy. The flat plate air collector plays crucial role for drying the agricultural produce in solar dryer application. This research work, focuses on the design and development a solar collector for drying agriculture produces using waste aluminum cans of beverages. A solar air collector is designed and developed in the laboratory as per IS 1933, 2003 standard. A solar collector developed has been tested and an overall performance of the system is evaluated for three different mass flow rates (0.01 kg/s, 0.008 kg/s and 0.006 kg/s) for drying 15 kg of green chilies. The selective coating material made by mixing activated charcoal and black board paint is applied on the cylindrical curved surface of the tubes considering the critical radius of insulation. The inlet and outlet temperature of air has been recorded for different mass flow rate and the overall collector efficiency is calculated. Further, the moisture removal rate from green chilies is evaluated for every 30 minutes of time interval in a day. It is found that the efficiency is decrease with increase in mass flow rate. A maximum moisture removal rate of 88% is observed for a mass flow rate of 0.01 kg/s and the maximum efficiency of solar collector of 50.27%. is attained for a mass flow rate of 0.006 kg/s.

Experimental study of vacuum-based membrane dehumidifier for HVAC system: Parametric analysis and dehumidification performance

Vacuum-based membrane dehumidifiers (VMDs), an emerging air dehumidification technology, use selective membranes to remove moisture from humid air; these dehumidifiers have the potential to save energy and enhance thermodynamic efficiency through decoupled latent and sensible cooling. In this study, a prototype of a vacuum-based membrane dehumidifier at the scale of an air-conditioning system was developed, and its dehumidification characteristics were experimentally evaluated under various test conditions (i.e., air temperature, air humidity, air velocity, and pressure on the permeate side). Four indices were selected to examine the dehumidification performance of the system: the humidity ratio difference, moisture removal rate, dehumidification efficacy, and performance coefficient. The results revealed that the humidity ratio difference ranged 3.38–14.76 g/kg, moisture removal rate 0.16–1.09 kg/h, dehumidification effectiveness 35.4 %–82.7 %, and COP 0.16–0.86. In the parametric analysis of the prototype, the airflow rate and humidity ratio are identified as essential parameters for the dehumidification performance. Moreover, the thermodynamic perspective in the Psychrometric chart and transient operation were utilized to evaluate the operational characteristics of the prototype unit. All experimental results showed that the difference in temperature between the inlet and outlet air was less than 1.5 °C, and the saturation time is shown to be within 5 min.

Numerical and experimental investigation of desiccant cooling system using metal organic framework materials

• Modelling of stationary desiccant wheel coated with different metal organic framework adsorbent materials (MIL-100(Fe), MIL101(Cr), CPO-27(Ni), Aluminium fumarate). • Develop new equilibrium equations from the isotherms related to these MOFs. • New experimental data and numerical data for stationary honeycomb desiccant wheel coated with Aluminium Fumarate was generated. • MOF materials coating process and performance comparisons with different humidifier air speeds. Evaporative cooling consumes fraction of the electricity required by the vapour compression refrigeration system but is only effective in dry weather conditions. A promising method for controlling the incoming air humidity is to use a desiccant wheel before the evaporative cooler. Currently, most desiccant cooling systems employ conventional materials like silica gel or zeolites which have low water uptake. Metal Organic Framework (MOF) materials are new class of meso -porous material with high water adsorption capabilities (∼1.5 kg/kgads). Using numerical modelling and experimental testing, this paper investigates the use of four MOF materials namely CPO27(NI), MIL100(Fe), MIL-101(Cr), Aluminium Fumarate and silica gel on the performance of a stationary desiccant heat exchanger (honeycomb Aluminium structure coated with MOF desiccant material) in terms of the Coefficient of performance (COP) and moisture removal rate. Numerical results showed that Aluminium fumarate produced the highest COP of 0.65 with water removal rate of 12.65 g/kg dry air and MIL-101(Cr) produced the highest moisture removal of 15.99 g/kg dry air but with COP of 0.44 compared to silica gel and other MOF materials used. Experimental tests were carried out using honeycomb structure coated with Aluminium fumarate as the stationary desiccant wheel and results were compared to numerical modelling showing good agreement with maximum deviation of 13%. Experimental and modelling results showed that the rate of moisture removal increases with the increase of air inlet humidity and with the decrease of incoming air speed. Also, results showed that the highest moisture removal occur after the first 2 min from starting the dehumidification process highlighting the advantage of using MOF materials.

A novel membrane liquid desiccant system for air humidity control

Humidity control using efficient dehumidification technologies is considered a promising way to achieve energy savings in air-conditioning systems in buildings. The present study examines the performance of a novel liquid desiccant air system that employs a cross-flow hollow fiber membrane module. Moreover, a bubble regenerator is introduced to regenerate the diluted desiccant solution. The proposed dehumidifier driven by a heat pump is investigated in a dedicated outdoor air system (DOAS) under the climatic conditions of the subtropical zones, especially in a Mediterranean climate. The variations in the dehumidification effectiveness and moisture removal rates are numerically tested under various conditions. The developed mathematical models are validated by the conducted experiments and show that they can predict the system accurately. The results demonstrate that the novel system achieves a higher moisture removal rate in comparison to the conventional system, with an improvement of 28–134%. The obtained results prove the proposed system's ability for proper outdoor air treatment and may be helpful in assessing its optimal operating and control strategy.

Convective and evaporative heat transfer coefficients during drying of ivy gourd under natural and forced convection solar dryer.

In the present work, a study on convective heat, mass transfer coefficients and evaporative heat transfer coefficient of the thin layer drying process of ivy gourd is performed. The experiment was conducted in three drying modes such as natural, forced convection solar dryer and open sun drying. The hourly data for the rate of moisture removal, sample temperature, relative humidity inside and outside the solar and ambient air temperature for complete drying have been recorded. The drying air temperature varied from 55, 65, 70 and 75°C, and the air velocity was 1, 1.5 and 2m/s. All the drying experiments had shown a falling rate period. The data obtained from experimentation have been used to evaluate the experimental constant values of C and n by simple regression analysis. Based on the values of "C" and "n", convective and evaporative heat transfer coefficients for ivy gourd were determined. The average convective heat and mass transfer coefficients varied between 2.64 and 8.30W/m2 °C and 0.0025 to 0.0076m/s for temperature ranges, at the different air velocities, respectively. The average evaporative heat transfer coefficient for ivy gourd varied from 181.89 to 421.84W/m2 °C. It was observed that convective and evaporative heat transfer coefficients increase with the increase in drying air temperature. The rate of increment of evaporative heat transfer coefficient is higher than the convective heat transfer coefficient. The intensity of heat and mass transfer during solar drying depends on the drying air temperature and velocity.

Tempering Drying and Energy Consumption

Abstract The aim of this work is to optimize the drying process through the reduction of energy consumption and the improvement of the dried product quality using tempering or intermittent drying. The effectiveness of intermittent drying was evaluated by the determination of the sensible, latent, and total energies necessary to perform the drying process. The obtained results show that tempering drying is more effective than continuous drying. This effectiveness was evaluated by the energy consumption. A reduction of energy consumption varying from 13% to 67% was achieved. The drying time, energy consumption, and product quality were improved when using temporary drying. The decrease of the gradient of moisture content in the material during the period of no heating is considered as the main factor that increases the rate of moisture removal when the heating is resumed.

Structure-improved current collector for performance enhancement of electrolyte membrane dehumidifiers: 3D simulations and in-situ measurements

Electro-dehumidification based on proton exchange membrane (PEM) is promising owing to its compact assembly and convenient operation. By numerically improving the effects of current collectors’ structure on the operation performance (moisture removal rate, current/temperature/humidity distribution and energy utilization rate), this research achieved a significant dehumidification enhancement (more than 40%) for electrolyte membrane dehumidifiers. 3D Multiphysics simulation and in-situ verification measurements were conducted. Compared with the original collectors, the dehumidification rate can be enhanced by 35% with the “口” collectors, and by more than 40% with “X”, “#” and “▪” collectors. The best performance occurred with the anode collector of “▪” structure (opening area: 9 × 10-4 m2), which the rate increased by 46%. The improvement effects were mainly due to the improvement of potential distribution (especially on the anode side) and the concentration of the reactant (water vapor) reaching the catalyst interface. Compared with the “口” type, the current density uniformity of membrane dehumidifier with the “▪” collector increased from 0.0033 to 0.032. The temperature and moisture distribution were also more uniform. The opening structure of anode collector resulted in a more significant effect than the opening area. Therefore, the system energy utilization rate and COP (coefficient of performance) can be doubled, up to 3.48 × 10−2 g·J−1·m−2 and 0.26, respectively. This research provides a theoretical basis and practical direction for improving current collectors of PEM dehumidifiers.

Modelling and experimental analysis of rice drying in new fluidized bed assisted hybrid infrared-microwave dryer

This study aimed to investigate how infrared (1000–2000 W) and microwave power (100–900 W), air velocity (1–5 m/s) and temperature (40–80 °C) affected the specific energy consumption, the moisture removal rate, and the product's quality (whiteness index, head rice yield, water uptake ratio, and elongation ratio) in hybrid dryer. Rising temperature, velocity and microwave power and lower temperatures resulted in improving head rice yield of paddy samples. The experiments proved that the new hybrid system significantly increased the moisture removal rate (from 100 to 700%), head rice yield (from 5 to 40 %) and decreased the specific energy consumption (from 10 to 80%) compared to the single fluidized bed dryer. The water uptake ratio and elongation ratio of the dried samples in the hybrid dryer were higher than the single dryer, however their whiteness index was not significantly different. The best drying conditions are associated with the lowest specific energy consumption and the highest moisture removal ratio and rice quality. Experimental data were fitted into empirical drying models to explain moisture ratio variations during drying. Nomhorm and verma,s model was found to be the best for moisture ratio prediction. Also, the central composite design of response surface methodology was applied to forecast outputs. A modified cubic model was observed in all responses with high R2 values (greater than0.9). The drying parameters were optimized for the specified constraints, resulting in 68 °C temperature, 5 m/s air velocity, 900 w microwave power, and 1479 w infrared power. The experimental values were found to be 0.368607 g/s for the moisture removal rate, 7.16988 MJ/kg water for the specific energy consumption, 90.6% for the head rice yield, 58 for the whiteness index, 3.63 for the water uptake ratio, and 2.28627 for the elongation ratio, at the optimum treatment conditions.

Drying kinetics of a solar dryer for drying of potato chips in Western Maharashtra, India

The current study focuses on the performance of Solar Greenhouse Dryer for drying of potato chips in Solar Dryer and Open sun condition in Western Maharashtra. The potato chips is a value added product, that can be effectively used during throughout year as snacks, side dish or appetizer. It can be either deep dried or backed for consumption. The potato contains high fiber, it helps to lower the cholesterol level in blood reducing the risk of blood pressure if consumed backed. The potato chips can be effectively stored for one year to six months and consumed as snacks.The experiment was conducted at Bahe, Borgaon, Tal-Walwa, Dist- Sangli, Maharashtra, India located at 17.115o N and 74.33o E. The Moisture Removal Rate (MRR) for drying of potato chips in Solar Greenhouse Dryer and Open sun drying is 83% and 78% respectively. The drying rate observed during the experiment has a better resemblance with simulated Response Surface Modelling.

Experimental Investigation of Thermal Performance Parameters of Drying Air Unit with a Different Flowrate of Liquid Desiccant Solution

Liquid desiccant air-conditioning systems remove directly the latent load from moist air and remove indirectly sensible load of this air by using an indirect evaporative cooling process. The liquid desiccant must subsequently be regeneration once again with a low-grade heat source like solar energy. In this study, calcium chloride solution was used as a desiccant. For the desiccant solution regeneration process, a flat plate solar collector was employed. Different variables, such as the primary airflow rate and desiccant flow rate, were changed during the experiments. The impact of these variables on the performance parameters of the desiccant systems such as moisture removal rate, moisture efficiency, enthalpy efficiency, sensible heat ratio, and the mass transfer coefficient was studied. The obtained results revealed that as the flow rate of primary air increases, the moisture removal rate, sensible heat ratio, and the mass transfer coefficient increase. For example, from 0.006 m/s to 0.0125m/s when the mass airflow rate increased from 0.1 kg/s to 0.18 kg/s.

Performance assessment of sustainable energy based novel technique for multistage reciprocating liquid dehumidification system

Liquid desiccant technology is a promising option with a high thermal coefficient of performance (COP), easy storage, and lower regeneration temperature. Single stage static liquid dehumidification approach gave a limited moisture removal rate. Hence, the paper focuses on designing and fabricating a multistage reciprocating desiccant dehumidification system integrated with a conventional vapour compression cycle. The system consists of an absorber unit consisting of calcium chloride liquid desiccant and a duct integrated with Celdek packing for dehumidifying the inlet air. The desiccant concentration is recovered by circulating it to a regeneration unit. Regeneration unit consists of a heating unit, a separator, & a contact device. Experiments are conducted by varying the number of packings, desiccant concentrations, and air Reynolds number. Dehumidification performance parameters such as coefficient of mass transfer (MTC), rate of moisture removal (MRR), sensible heat factor (SHF), dehumidification effectiveness (DE) are evaluated. Energy consumption is determined for varying conditions, and the coefficient of performance of the overall system is determined. Regenerator performance is studied corresponding to change in the desiccant concentration at various stages of regeneration. Experimental results indicated a maximum dehumidification efficiency, moisture removal rate, and the coefficient of performance is equal to 77.6%, 5.2 g/s and 3.5. In the contact device, when packing linear velocity increases from 0.13 m/s o 0.26 m/s, ΔW will be increased by 116%, and ΔT dropped by 17.3% for 40% desiccant solution. Contact device is very effective for regeneration in increasing the desiccant concentration and reducing the temperature.

Evaluation of the effect of high-power ultrasound waves on conventional air drying of cumin seeds

The main objective of this study was to assess the potency of ultrasonic waves to modify the moisture removal characteristics of cumin seeds and the dryer performance from the energy viewpoint in a conventional air drying system. In this regard, a thin layer of the seeds was dried, practicing different drying air temperatures (30, 35, and 40 °C) and ultrasound power levels (0–180 W) at a constant flow velocity of 0.6 m/s. Accelerated moisture removal rate, diminished drying duration, and reduced energy expenditure was among the benefits achieved during the drying process by increasing drying air temperature and ultrasound power level. The variation range of effective moisture diffusivity was 0.648 × 10-10 to 2.670 × 10-10 m2/s, revealing that sonication by power ultrasound increased diffusion transport within the samples. Further, specific energy consumption, energy efficiency, and thermal efficiency were obtained within the ranges of 203.68–450.70 MJ/kg, 0.689–1.524 %, and 1.728 to 3.617 %, respectively. Sonication by 180 W at the drying temperature of 40 °C caused the maximum energy (1.524 %) and thermal (3.617 %) efficiencies, indicating that ultrasound intervention in airflow results in a more energy-efficient dewatering process.

Wickability-optimized textured liquid-desiccant air dehumidifiers for independent moisture management in energy-efficient buildings

Liquid-desiccant-based air conditioning systems are envisioned to enable independent humidity management, thereby improving the energy efficiency of future buildings. Existing liquid-desiccant-based air conditioning concepts, however, suffer from a poor liquid flow distribution deteriorating moisture removal rate. They are consequently flooded with the liquid-desiccant solution, which significantly degrades the energy efficiency of the dehumidification process. Here, the capillary forces and wickability effect of textured air dehumidifier surfaces are altered to minimize the liquid-desiccant flow rate of the fully wetted state, thereby transforming the physics of interfacial desiccant flow distribution. Consequently, the wickability-optimized air dehumidifier surface maximizes both moisture removal rate and dehumidification energy efficiency. It was interestingly found that the length scale of a textured air dehumidifier surface concept is optimized at an intermediate pattern density. Dry solid-air menisci appear at length scales exceeding the optimum pattern distance while the effective liquid–air interfacial area is reduced at smaller length scales, both of which degrade the moisture removal rate. At the optimum pattern density, the effective liquid–air interfacial area increases with the solution flow rate, thereby increasing the dehumidification rate. At a water vapor pressure potential of 3 kPa and a solution flow rate of 2.8 g/s, experimental results indicated a moisture removal rate of 0.16 g/m2-s for a textured surface concept with a capillary length scale of 3 mm, a 28% improvement compared with that of smooth-plate dehumidifier surfaces. A high moisture removal rate of the textured surface at a low desiccant flow rate led to a high thermal efficiency of 0.75 at a water vapor pressure potential of 5.6 kPa and a LiBr flow rate of 2.8 g/s. The insights gained from the present study accelerate the development of advanced textured surface concepts for next-generation liquid-desiccant-based air dehumidification systems offering independent humidity management for future energy-efficient buildings.

Performance study of heat and mass transfer in a counterflow liquid to air membrane-based parallel-plate dehumidifier

Liquid to air membrane energy exchanger (LAMEE) is the most important component in a liquid desiccant air conditioning system. Three main configurations of LAMEE are presented in the literature: co-current, counterflow, and cross-counter flow. In this paper, we evaluated the performance of a counterflow LAMEE dehumidifier in terms of its cooling capacity (CC) and moisture removal rate (MRR). A numerical model was developed and validated with experimental results. The impact of solution properties and inlet air characteristics on the LAMEE’s performance were investigated. Simulation results show that CC and MRR are enhanced by decreasing the temperature and increasing the concentration of the liquid desiccant simultaneously. In order to obtain an optimal performance of the LAMEE, the solution mass flow rate should be equal to or slightly higher than the inlet air mass flow rate. On the other hand, we found that both CC and MRR increase with increasing inlet air temperature and relative humidity. Even though solution properties and inlet air characteristics affect the MRR and the CC, they have a negligible effect on the required air sensible cooling to meet the supply air condition (Qsen). The characteristics of outlet air provided by the LAMEE are in a stable state condition, which proves that the LAMEE has a wide range of adaptability in different operating conditions.

Theoretical and experimental study of the multistage dynamic dehumidifier for enhanced thermal comfort conditions in a building

In the present study, a mathematical model is constructed to simulate the heat and mass transfer process in a counterflow multistage reciprocating dehumidifier unit. Four packings are positioned at different positions where a camshaft mechanism controls their linear motion. Packings dip inside the Calcium Chloride desiccant instead of the conventional spray technique, improving the wettability and dehumidification effect. Theoretical and experimental results are compared. System performance is analyzed by varying the number of packing and performance parameters such as outlet temperature, specific humidity, moisture effectiveness, moisture removal rate, mass transfer coefficient and pressure change. Results indicated that the system gave maximum moisture effectiveness, moisture removal rate and mass transfer coefficient equal to 0.75, 2.21 g/s and 15.08 kg/m2−s. Stage-wise evaluation of the performance shows that there is a significant improvement in the dehumidification performance by the addition of multiple stages.