The Experts below are selected from a list of 1512 Experts worldwide ranked by ideXlab platform
Avadhesh Yadav - One of the best experts on this subject based on the ideXlab platform.
-
Effect of different arrangements of sector on the performance of Desiccant Wheel
Heat and Mass Transfer, 2018Co-Authors: Laxmikant Yadav, Avadhesh YadavAbstract:In this paper, Desiccant Wheel is divided into three sections, namely process, regeneration and the third small section or sector (TSS). The Performance of the Desiccant Wheel changes when TSS is installed in different positions. So this study numerically investigated the position of TSS in the Desiccant Wheel by installing the TSS in four different arrangements. In the first arrangement there is only two sections i.e. process and regeneration, in the second arrangement the TSS has been installed in the process section while in the third arrangement, it has been installed in the regeneration portion of the Desiccant Wheel. In the fourth arrangement, the same TSS section has been installed in such a manner that half the portion of the TSS is in regeneration side and remaining half is in the process side. A comparative performance study among these arrangements of Desiccant Wheel reveals that for low exit humidity, TSS should be installed in the process side while for the air conditioning application (where humidity is expected to be moderate, DCOP should be high and the increase in temperature of process air should be less), TSS be installed on the regeneration side of the Desiccant Wheel.
-
mathematical investigation of purge sector angle for clockwise and anticlockwise rotation of Desiccant Wheel
Applied Thermal Engineering, 2016Co-Authors: Laxmikant Yadav, Avadhesh YadavAbstract:Abstract One dimensional mathematical model is developed to investigate the purge sector angle of the Desiccant Wheel for different operating conditions. The model shows good agreement with the experimental results obtained from the literature. In this paper the purge section is installed in the regeneration section and conduct a comparative performance analysis in both the directions of rotation (clockwise and anticlockwise) of the Desiccant Wheel with different purge sector angles. It was found that anticlockwise direction gives better dehumidification for the given purge angle at any operating condition; the performance parameter (rotation of Wheel, velocity and ambient moisture) results better in lower purge sector angle (5° to 10°) as compared to higher purge angles while in case of regeneration temperature, purge sector angle of 15° gives better performance results as compared to other purge sector angles.
-
Comparative performance of Desiccant Wheel with effective and ordinary regeneration sector using mathematical model
Heat and Mass Transfer, 2014Co-Authors: Avadhesh Yadav, Laxmikant YadavAbstract:A mathematical model for predicting the performance of a Desiccant Wheel with effective regeneration sector has been used. This model has been used to conduct a comparative performance of Desiccant Wheel with effective and ordinary regeneration sector. It was found that for all the cases considered in this study like rotation of Wheel, regeneration temperature, velocity and ambient moisture, the Desiccant Wheel with “effective regeneration sector” gives better result as compared to ordinary regeneration sector.
-
Design and operating parameter analysis to improve the performance of solar Desiccant Wheel using a mathematical model: part-II
International Journal of Renewable Energy Technology, 2014Co-Authors: Avadhesh Yadav, V.k. BajpaiAbstract:A mathematical model has been used to predicting the design and operating parameter of Desiccant Wheel for performance analysis of Desiccant Wheel. Model considered both gas and solid side resistance. The model shows good agreement with experimental data. It was found that the moisture removal and temperature difference of the process air increases with increasing process inlet moisture, regeneration temperature, regeneration inlet velocity and these decreases with increasing process/regeneration area ratio, process inlet velocity, process inlet temperature and regeneration inlet moisture. For the best moisture removal, the rotational speed must lie in the range of 15 to 25 rph.
-
ANALYSIS OF Desiccant Wheel WITH PURGE SECTOR FOR IMPROVING THE PERFORMANCE USING A MATHEMATICAL MODEL
International Journal of Air-conditioning and Refrigeration, 2014Co-Authors: Avadhesh YadavAbstract:A mathematical model for predicting the performance of a Desiccant Wheel with purge sector has been used and heat and mass transfer for both moist air and the Desiccant material have been considered. The model shows a good agreement with experimental results. Several studies have been done on using of purge sector in Desiccant Wheel. This paper also analyses the effect of purge sector by utilizing the output of purge air in regeneration and conduct a comparative performance analysis in both the directions of rotation (clockwise and anticlockwise) of Desiccant Wheel. It was found that for all the cases considered in this study like rotation of Wheel, regeneration temperature, velocity and ambient moisture, the performance parameter results better in anticlockwise direction as compared to clockwise direction of rotation of the Desiccant Wheel. Mainly at low rph and low regeneration temperature effect of direction on the performance is more but at low ambient moisture and low velocity effect is less.
Laxmikant Yadav - One of the best experts on this subject based on the ideXlab platform.
-
Advanced Technology in Desiccant Wheel Air Conditioning System: A Review
IOP Conference Series: Materials Science and Engineering, 2018Co-Authors: Amarjeet Kumar Prasad, Laxmikant YadavAbstract:Desiccant Wheel air conditioning have been considered as one of the effective process to control humidity of ambient air. Desiccant Wheel air conditioning system do not use any ozone- depleting refrigerant and also intake lesser energy compared to vapour compression system. All the types and kind of Desiccants have been discussed here. Such as solid Desiccant system, liquid system have been reviewed briefly. Finally, a summary of economic prospect, future scope, environmental friendly technology and future scope of Desiccant Wheel air conditioning system have been discussed briefly.
-
Effect of different arrangements of sector on the performance of Desiccant Wheel
Heat and Mass Transfer, 2018Co-Authors: Laxmikant Yadav, Avadhesh YadavAbstract:In this paper, Desiccant Wheel is divided into three sections, namely process, regeneration and the third small section or sector (TSS). The Performance of the Desiccant Wheel changes when TSS is installed in different positions. So this study numerically investigated the position of TSS in the Desiccant Wheel by installing the TSS in four different arrangements. In the first arrangement there is only two sections i.e. process and regeneration, in the second arrangement the TSS has been installed in the process section while in the third arrangement, it has been installed in the regeneration portion of the Desiccant Wheel. In the fourth arrangement, the same TSS section has been installed in such a manner that half the portion of the TSS is in regeneration side and remaining half is in the process side. A comparative performance study among these arrangements of Desiccant Wheel reveals that for low exit humidity, TSS should be installed in the process side while for the air conditioning application (where humidity is expected to be moderate, DCOP should be high and the increase in temperature of process air should be less), TSS be installed on the regeneration side of the Desiccant Wheel.
-
mathematical investigation of purge sector angle for clockwise and anticlockwise rotation of Desiccant Wheel
Applied Thermal Engineering, 2016Co-Authors: Laxmikant Yadav, Avadhesh YadavAbstract:Abstract One dimensional mathematical model is developed to investigate the purge sector angle of the Desiccant Wheel for different operating conditions. The model shows good agreement with the experimental results obtained from the literature. In this paper the purge section is installed in the regeneration section and conduct a comparative performance analysis in both the directions of rotation (clockwise and anticlockwise) of the Desiccant Wheel with different purge sector angles. It was found that anticlockwise direction gives better dehumidification for the given purge angle at any operating condition; the performance parameter (rotation of Wheel, velocity and ambient moisture) results better in lower purge sector angle (5° to 10°) as compared to higher purge angles while in case of regeneration temperature, purge sector angle of 15° gives better performance results as compared to other purge sector angles.
-
Comparative performance of Desiccant Wheel with effective and ordinary regeneration sector using mathematical model
Heat and Mass Transfer, 2014Co-Authors: Avadhesh Yadav, Laxmikant YadavAbstract:A mathematical model for predicting the performance of a Desiccant Wheel with effective regeneration sector has been used. This model has been used to conduct a comparative performance of Desiccant Wheel with effective and ordinary regeneration sector. It was found that for all the cases considered in this study like rotation of Wheel, regeneration temperature, velocity and ambient moisture, the Desiccant Wheel with “effective regeneration sector” gives better result as compared to ordinary regeneration sector.
-
Effect of Desiccant isotherm on the design parameters of Desiccant Wheel
Heat and Mass Transfer, 2014Co-Authors: Laxmikant Yadav, A. Yadav, Vishal Dabra, Avadhesh YadavAbstract:A one dimensional mathematical model is developed to optimize the design parameters of Desiccant Wheel. The result shows that after some value of design parameters, change in moisture removal is negligible. The optimum isotherm shape should be R = 0.1. At this isotherm optimum value of Wheel length, and channel pitch should be in the range of 0.2–0.25 and 0.003–0.004 m respectively.
V.k. Bajpai - One of the best experts on this subject based on the ideXlab platform.
-
Design and operating parameter analysis to improve the performance of solar Desiccant Wheel using a mathematical model: part-II
International Journal of Renewable Energy Technology, 2014Co-Authors: Avadhesh Yadav, V.k. BajpaiAbstract:A mathematical model has been used to predicting the design and operating parameter of Desiccant Wheel for performance analysis of Desiccant Wheel. Model considered both gas and solid side resistance. The model shows good agreement with experimental data. It was found that the moisture removal and temperature difference of the process air increases with increasing process inlet moisture, regeneration temperature, regeneration inlet velocity and these decreases with increasing process/regeneration area ratio, process inlet velocity, process inlet temperature and regeneration inlet moisture. For the best moisture removal, the rotational speed must lie in the range of 15 to 25 rph.
-
Operating parameter analysis to improve the performance of solar Desiccant Wheel using a mathematical model: Part 1
International Journal of Renewable Energy Technology, 2013Co-Authors: Avadhesh Yadav, V.k. BajpaiAbstract:A mathematical model for analysis of various operating parameters to improve the performance of Desiccant Wheel has been used and heat and mass transfer for both moist air and the Desiccant material have been considered. An experimental setup is fabricated using the evacuated tube solar air collector with Desiccant Wheel. The hot air needed for regeneration is produced by evacuated tube solar air collector, which has collector surface area of 4.44 m2. The regeneration can be started from 40°C. The temperature of outlet air is obtained in the range of 40–65°C by this evacuated tube solar air collector. The experimental results are used to validate the mathematical model with good agreement. The effects of velocity of the regeneration air and the process air have been studied and it was found that moisture removal of Desiccant Wheel increases with increase in regeneration air velocity and decrease with increase in process air velocity. On the basis of obtained results, the following recommendations have bee...
-
Operating parameter analysis to improve the performance of solar Desiccant Wheel using a mathematical model: Part 1
International Journal of Renewable Energy Technology, 2013Co-Authors: Avadhesh Yadav, V.k. BajpaiAbstract:A mathematical model for analysis of various operating parameters to improve the performance of Desiccant Wheel has been used and heat and mass transfer for both moist air and the Desiccant material have been considered. An experimental setup is fabricated using the evacuated tube solar air collector with Desiccant Wheel. The hot air needed for regeneration is produced by evacuated tube solar air collector, which has collector surface area of 4.44 m2. The regeneration can be started from 40°C. The temperature of outlet air is obtained in the range of 40–65°C by this evacuated tube solar air collector. The experimental results are used to validate the mathematical model with good agreement. The effects of velocity of the regeneration air and the process air have been studied and it was found that moisture removal of Desiccant Wheel increases with increase in regeneration air velocity and decrease with increase in process air velocity. On the basis of obtained results, the following recommendations have been made: velocity of the process air is between 1 m/s and 2.5 m/s and the regeneration air is between 3 m/s and 5 m/s. These results are useful to study and analyse of solid Desiccant dehumidification systems.
-
Analysis of various designs of a Desiccant Wheel for improving the performance using a mathematical model
Journal of Renewable and Sustainable Energy, 2013Co-Authors: Avadhesh Yadav, V.k. BajpaiAbstract:A mathematical model for predicting the performance of a Desiccant Wheel with various Wheel designs has been used by considering heat and mass transfer for both moist air and the Desiccant material. The model shows good agreement with experimental data. An experimental setup was fabricated using an evacuated tube solar air collector with a Desiccant Wheel. The hot air needed for regeneration is produced by the evacuated tube solar air collector, which has a collector surface area of 4.44 m2. The regeneration can be started from 40 °C. The temperature of outlet air obtained is in the range of 40–65 °C in this evacuated tube solar air collector. The experimental setup was installed at NIT Kurukshetra, India, 29° 58′ (latitude) North and 76° 53′ (longitude) East. This model is used to compare the performance of two sector and four sector Desiccant Wheels and found that the maximum moisture removal efficiency of both two sector and four sector is same but in the two sector, it is obtained at twice the rph of ...
-
An experimental investigation of solar-powered Desiccant Wheel with different rotational speeds
International journal of ambient energy, 2013Co-Authors: Avadhesh Yadav, V.k. BajpaiAbstract:Regeneration and adsorption rate of Desiccant Wheel for producing dry air have been experimentally investigated. The air needed for regeneration was heated in an evacuated tube solar collector with a surface area of 4.44 m2. The Desiccant Wheel is regenerated at a temperature range of 50–55°C. The regeneration and adsorption performances are affected by the regeneration temperature, Wheel rotation, air flow rate (process and regeneration) and ambient conditions. On comparison, the adsorption and regeneration rates at different rotations per hour (rph) and at a constant flow rate of 210.789 kg/h for both adsorption sector and regeneration sector, it is found that in the range of 50–55°C average regeneration temperature, the solar-powered Desiccant Wheel performs well with a rotational speed of 16 rph. The regeneration performance of Desiccant Wheel with evacuated tube solar air collector is suitable for the Indian climatic conditions.
R Z Wang - One of the best experts on this subject based on the ideXlab platform.
-
Experimental testing on contaminant and moisture removal performance of silica gel Desiccant Wheel
Energy and Buildings, 2018Co-Authors: Y.j. Dai, R Z WangAbstract:Abstract Indoor air quality including temperature, humidity and cleanliness has attracted more and more attention recently. Rotary Desiccant Wheel system provides a good solution to improve indoor air quality due to it can realize both TVOC and moisture control. In order to analyze practical performance of Desiccant Wheel, in this paper an experimental setup is built and TVOC removal as well as moisture removal capacity of silica gel Desiccant Wheel is discussed. Performance of the Wheel is evaluated by the removal efficiency of TVOC (Ec) and moisture (Ed). Experiments are firstly conducted under mild environmental condition with moderate temperature and humidity ratio to analyze effects of main parameters on TVOC removal efficiency, and it is found that Ec increases with the increasing of regeneration temperature, also under experimental condition the required regeneration air temperature range for TVOC removal fits with the regeneration temperature for dehumidification. Then under Shanghai summer condition the combined removal capacity of TVOC and moisture under the same regeneration air temperature is discussed. Results show that regeneration temperature higher than 100°C is recommended under experimental conditions to meet both needs from TVOC and humidity load. Also under this condition, dehumidification capacity of the system is greatly affected by ambient humidity ratio but keep fixed with changing of TVOCA concentration, and TVOC removal capacity is influenced both by ambient humidity condition and contaminant concentration.
-
review on solar powered rotary Desiccant Wheel cooling system
Renewable & Sustainable Energy Reviews, 2014Co-Authors: T.s. Ge, R Z WangAbstract:Rotary Desiccant Wheel cooling system operates on the principle of adsorption dehumidification and evaporative cooling. The system adopts natural substance as working fluid and can be driven by low grade thermal energy such as solar energy. Due to these merits, solar powered rotary Desiccant Wheel cooling system has recognized as one of good alternatives to conventional vapor compression air conditioning system and has obtained increasing interests in the past years. This paper aims to summarize recent research developments related to solar powered rotary Desiccant Wheel cooling system and to provide information for potential application. Based on whether auxiliary refrigeration system is adopted, the systems are divided in to two categories: separate solar powered rotary Desiccant Wheel cooling systems and hybrid solar powered rotary Desiccant Wheel cooling systems. Within the first category, separate solar powered rotary Desiccant Wheel cooling systems are reviewed according to different types of solar collector. It can be found that these researches mainly focus on feasibility study of such system under different climates. Results show that separate solar powered rotary Desiccant Wheel cooling systems can be adopted in several representative cities in Europe, Asia, Australia and Africa. However, system performance in terms of solar fraction and thermal coefficient of performance varies greatly with respect to different operation conditions. For the second category, works related to hybrid solar powered rotary Desiccant Wheel cooling systems are grouped by types of auxiliary refrigeration systems. It can be found that vapor compression system is widely adopted in these hybrid systems. Also, due to both solar energy and electricity are consumed in hybrid systems, primary energy consumption is an important performance index. Results show that hybrid solar powered rotary Desiccant Wheel cooling system can obtain significant energy saving compared with conventional vapor compression system.
Lei Fang - One of the best experts on this subject based on the ideXlab platform.
-
experimental analysis and regression prediction of Desiccant Wheel behavior in high temperature heat pump and Desiccant Wheel air conditioning system
Energy and Buildings, 2014Co-Authors: Ying Sheng, Yufeng Zhang, Lei FangAbstract:Abstract The objectives of this study are to evaluate the performance of Desiccant Wheel (DW) in the running system and obtain the useful data for practical application. The combined influences of multiple variables on the performance of Desiccant Wheel are investigated based on evaluating the indexes of moisture removal capacity, dehumidification effectiveness, dehumidification coefficient of performance and sensible energy ratio. The results show that higher effect on the dehumidification is due to the regeneration temperature and outdoor air humidity ratio rather than the outdoor air temperature and the ratio between regeneration and process air flow rates. A simple method based on multiple linear regression theory for predicting the performance of the Wheel has been proposed. The predicted values and the experimental data are compared and good agreements are obtained. Regression models are established which can easily predict the behavior of DW and also helpful for developing a DW performance map for the further optimization of automatic control of the system.
-
experimental analysis on performance of high temperature heat pump and Desiccant Wheel system
Energy and Buildings, 2013Co-Authors: Ying Sheng, Yufeng Zhang, Na Deng, Lei FangAbstract:Abstract In order to solve the problem of high energy consumption for regeneration of Desiccant Wheel in the rotary Desiccant system, high temperature heat pump and Desiccant Wheel (HTHP&DW) system and corresponding air conditioning unit is built and tested in the extensive thermal hygrometric environment. When the mixture refrigerant BY-3 is involved in the air source heat pump, the supply air temperatures are in the range as expected except that when in the extreme hot environment (above 36 °C), dehumidification capability are satisfied and the regeneration temperatures can satisfy the regeneration requirement of Desiccant without additional heat. It is also found that outdoor air temperature, humidity ratio and regeneration air flow rate have great impact on the performance of heat pump based on the coefficient of performance (COP) evaluated. COP is not quite high, as the maximum value is 2.26 for heat pump and 2.08 for whole system respectively. Hence several suggestions are made for optimizing the system which is also helpful for facilitating the development of mature product. As a conclusion, HTHP&DW system could be a potential alternative with effective operation which can be promoted in most areas of China based on the result of our experiment.