Liquid Desiccant Air Conditioning Using Single Storage Solution Tank, Evaporative Cooling, and Marquise-Shaped Solar Collector

2021 ◽  
Vol 143 (11) ◽  
Author(s):  
M. Sajesh ◽  
Geleta Fekadu ◽  
Kalpana ◽  
Sudhakar Subudhi
Keyword(s):  
Solar Collector ◽  
Air Conditioning ◽  
Removal Rate ◽  
Packed Bed ◽  
Solution Temperature ◽  
Moisture Removal ◽  
Liquid Desiccant ◽  
Mass Flowrate ◽  
Experimental Values ◽  
Storage Solution

Abstract The present paper deals with the experimental study of the liquid desiccant air conditioning system using the single storage solution tank. The novelty of the system is that the dehumidification and regeneration are carried out in a single compact unit. The regeneration of solution is done using the marquise-shaped solar collector. The liquid desiccant solution used here is calcium chloride and water. The moisture removal rate (MRR), moisture, and enthalpy effectiveness are used as the performance parameters. The effects of mass flowrate of solution, solution temperature, inlet air temperature, and relative humidity (RH) on the performance are investigated. The experimental outcome shows that when the solution flowrate is increased from 0.263 to 0.437 kg/s, the MRR is improved from 5.08 to 7.82 g/kg and when the RH is increased from 70% to 92%, the MRR is enhanced from 5.56 to 12.45 g/kg. The new correlation for moisture effectiveness is developed based on the experimental values and depending parameters, and also another correlation is developed based on Chung’s correlation (Chung, T.-W., 1994, “Predictions of Moisture Removal Efficiencies for Packed-Bed Dehumidification Systems,” Gas Sep. Purif., 8(4), pp. 265–268).

Performance analysis and mixing ratio selection of mixed liquid desiccant for a dehumidification system

2019 ◽  
Vol 29 (5) ◽  
pp. 711-720 ◽  
Author(s):  
Xiaoqiang Jiang ◽  
Huaming He ◽  
Xingyou Li ◽  
Huimin Mao
Keyword(s):  
Air Conditioning ◽  
Removal Rate ◽  
High Energy ◽  
Dew Point ◽  
Moisture Removal ◽  
Mixing Ratio ◽  
Liquid Desiccant ◽  
Mixed Salt ◽  
Dew Point Temperature ◽  
Selection Of

Liquid-desiccant dehumidification system in building air-conditioning has high energy efficiency in comparison to traditional dehumidification technology that needs to cool air below the dew point temperature. Since the dehumidification process dominates the performance of a liquid-desiccant system, this study aims to develop a deeper understanding in the dehumidification performance of some liquid desiccants. Then, an experiment test was conducted to determine the CaCl2-LiCl mixed liquid-desiccant system in a dehumidification system. The effects of the pure and mixture liquid desiccant solution on the moisture removal rate, refrigerating capacity and dehumidification performance were compared and analysed. Results show that with the increase in the LiCl concentration, the dehumidification capacity and dehumidification coefficient first increased rapidly and then increased slowly after 30% LiCl concentration. According to the economic analysis of mixed salt solution, the mixed LiCl and CaCl2 solution with a mixing ratio of 3:1 would achieve the best optimal dehumidification efficiency and would incur a low system cost under the working conditions of a dry-bulb temperature at 26°C and a relative humidity of 60% of fresh and return air.

Numerical Simulation of a Desiccant Bed for Solar Air Conditioning Applications

1991 ◽  
Vol 113 (2) ◽  
pp. 80-88 ◽  
Author(s):  
S. Farooq ◽  
D. M. Ruthven
Keyword(s):  
Numerical Simulation ◽  
Cycle Time ◽  
Air Conditioning ◽  
Removal Rate ◽  
Optimal Choice ◽  
Coefficient Of Performance ◽  
Thermal Coefficient ◽  
Moisture Removal ◽  
Cyclic Operation

The cyclic operation of a desiccant bed used for solar air conditioning applications has been simulated numerically. The results suggest that the optimal choice of desiccant is not seriously limited by the shape of the isotherm since the effect of isotherm shape on the moisture removal rate can be adequately compensated by appropriate adjustment of the cycle time. The conditions required to maximize the moisture removal rate for any given degree of nonlinearity also satisfy the requirements for maximizing the thermal coefficient of performance.

scholarly journals Feasibility of Liquid Desiccant Cooling (LDC) system under Mediterranean climate

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Seifennasr Sabek
Keyword(s):  
Air Conditioning ◽  
Mediterranean Climate ◽  
Removal Rate ◽  
Analytical Investigation ◽  
Liquid Desiccant ◽  
Humid Climate ◽  
Air Stream ◽  
Hot And Humid Climates ◽  
Mathematical Equations ◽  
Air Conditioning Systems

Contrary to the conventional air conditioning systems, the liquid desiccant cooling (LDC) systems are considered efficient systems to control the indoor air conditions. In addition, the LDC technologies are more adequate for the hot and humid climates. In this paper, we present an analytical investigation at assessing the feasibility of a LDC technology under Mediterranean climate. The mathematical equations including the sensible and latent heat transfer equations in both air stream and desiccant solution are presented. The impacts of climatic and operating parameters on the supplied air qualities, moisture removal rate (MRR) and sensible heat ratio (SHR) are evaluated. As a consequence, this study provides a solution to investigate the feasibility of this type of air conditioning technologies under hot and humid climate.

scholarly journals Experimental study on dehumidification performance of liquid desiccant system with aqueous HCO2K solution

2021 ◽  
Author(s):  
Ijas Ahmed. M ◽  
◽  
Amulya Yatelly ◽  
Gangadhara Kiran Kumar L ◽  
◽  
...  
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Removal Rate ◽  
Heat Removal ◽  
Solution Flow Rate ◽  
Airflow Rate ◽  
Moisture Removal ◽  
Liquid Desiccant ◽  
Solution Flow ◽  
Removal Capacity

The liquid desiccant systems are one of the promising technologies in dehumidification applications. The experimental study on dehumidification performance of a counter flow structured packing liquid desiccant system is done with Aqueous HCO2K as working fluid. The HCO2K solution at different mass flow rate of air and solution is tested. The airflow rate is varied from 0.187 kg/s to 0.272 kg/s and the solution flow rate is varied from 0.053 to 0.115 kg/s. The output parameters, specific moisture change, moisture removal rate, dehumidification effectiveness and latent heat removal capacity varied in following ranges 3-4.2 g/kg of dry air, 2.4-3.1 kg/h, 0.12-0.21 and 1.7-2.1 kW respectively. Particularly when air flow rate increases from 0.187 kg/s to 0.272 kg/s the moisture removal performance improves about 11% whereas when the solution flow rate increases from 0.055 to 0.115 kg/s, improvement in moisture removal performance about 20%. The results imply that increase in solution flow rate always have the positive impact on dehumidification performance. The increase in airflow rate has the negative impact on specific moisture removal and effectiveness, but the impact is positive in case of the moisture removal rate and latent heat removal capacity. The Overall results show a promising dehumidification performance and further improvement is possible by incorporating a cooling system.

Sign in / Sign up

Export Citation Format

Share Document