Performance Investigation of a Vapor Adsorption Refrigeration System Based on Adsorption/Desorption Time and Heat Transfer

2021 ◽  
Vol 13 (5) ◽  
Author(s):  
Manudeep Pendurthi ◽  
Vamsi Bhargav Pelluru ◽  
Anjaneyulu Chilakapati ◽  
Devendra Dandotiya ◽  
Nitin D. Banker
Keyword(s):  
Heat Transfer ◽  
Cooling Capacity ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Adsorption Refrigeration ◽  
Vapor Adsorption ◽  
Desorption Time ◽  
Absorption Refrigeration System ◽  
Vapor Absorption Refrigeration ◽  
Adsorption Desorption

Abstract In the past two decades, the development of sustainable refrigeration systems such as thermally operated vapor adsorption refrigeration systems achieved unparalleled growth in the research world as compared to conventional vapor compression systems and even thermally operated vapor absorption refrigeration system. Yet, the commercial success of the adsorption refrigeration system could not be achieved due to mainly its higher space area required per kilowatts of refrigeration capacity. With the focus to look improvement on this issue, the performance of the adsorption refrigeration system has been studied concerning adsorption/desorption time and heat transfer of adsorber. It is proposed to reduce the adsorption/desorption time, due to which the concentration (ratio of the mass of adsorbed refrigerant to the mass of activated carbon) will not reach its equilibrium value, but it is possible to get a higher mass flow in a shorter period. In turn, the cooling capacity will increase. In view of this, a mathematical model has been developed to study the performance and applied to three adsorbent–adsorbate pairs, namely, Maxsorb III–ethanol, Maxsorb III–R507a, and Maxsorb III–R134a. Based on the mathematical investigations, it is observed that the cooling capacity can be improved significantly at a litter higher cost of the heat transfer mechanism.

scholarly journals Cooling Capacity Test for MIL-101(Cr)/CaCl2 for Adsorption Refrigeration System

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3975
Author(s):  
Zhongbao Liu ◽  
Banghua Zhao ◽  
Yong Huang ◽  
Xin Qi ◽  
Fengfei Lou
Keyword(s):  
Water Vapor ◽  
Cooling Capacity ◽  
Water Vapor Adsorption ◽  
Condensation Temperature ◽  
Refrigeration System ◽  
Adsorption Refrigeration ◽  
Vapor Adsorption ◽  
Evaporation Temperature ◽  
Adsorption Temperature ◽  
Adsorption Desorption

An MIL-101(Cr) powder material was successfully prepared using the hydrothermal synthesis method, and then the original MIL-101(Cr) was combined with different mass fractions of CaCl2 using the immersion method to obtain a MIL-101(Cr)/CaCl2 composite material. The physical properties of the adsorbent were determined by X-ray powder diffraction (XRD), an N2 adsorption desorption isotherm test, and thermogravimetric analysis (TG). The water vapor adsorption performance of the metal-organic frameworks MOFs was tested with a gravimetric water vapor adsorption instrument to analyze its water vapor adsorption mechanism. Based on the SIMULINK platform in the MATLAB software, a simulation model of the coefficient of performance (COP) and cooling capacity of the adsorption refrigeration system was established, and the variation trends of the COP and cooling capacity of the adsorption refrigeration system under different evaporation/condensation/adsorption/desorption temperatures was theoretically studied. MIL101-(Cr)/CaCl2-20% was selected as the adsorption material in the adsorption refrigeration system through the physical characterization of composite materials with different CaCl2 concentrations by means of adsorption water vapor test experiments. A closed adsorption system performance test device was built based on the liquid level method. The cooling power per unit and adsorbent mass (COP and SCP) of the system were tested at different evaporation temperatures (288 K/293 K/298 K); the adsorption temperature was 298 K, the condensation temperature was 308 K, and the desorption temperature was 353 K. The experimental results showed that COP and SCP increased with the increase in the evaporation temperature. When the evaporation temperature was 298 K, the level of COP was 0.172, and the level of SCP was 136.9 W/kg. The COP and SCP of the system were tested at different adsorption temperatures (293 K/298 K/303 K); the evaporation temperature was 288 K, the condensation temperature was 308 K, and the desorption temperature was 353 K. The experimental results showed that the levels of COP and SCP decreased with the increase in the adsorption temperature. When the adsorption temperature was 293 K, the level of COP was 0.18, and the level of SCP was 142.4 W/kg.

scholarly journals Simulation of absorption refrigeration system for automobile application

2008 ◽  
Vol 12 (3) ◽  
pp. 5-13 ◽  
Author(s):  
Anand Ramanathan ◽  
Prabhakaran Gunasekaran
Keyword(s):  
Air Conditioning ◽  
Waste Heat ◽  
Vapor Compression ◽  
Absorption Refrigeration ◽  
Refrigeration System ◽  
Automotive Air Conditioning ◽  
Vapor Absorption ◽  
Vapor Compression Refrigeration ◽  
Absorption Refrigeration System ◽  
Vapor Absorption Refrigeration

An automotive air-conditioning system based on absorption refrigeration cycle has been simulated. This waste heat driven vapor absorption refrigeration system is one alternate to the currently used vapour compression refrigeration system for automotive air-conditioning. Performance analysis of vapor absorption refrigeration system has been done by developing a steady-state simulation model to find the limitation of the proposed system. The water-lithium bromide pair is used as a working mixture for its favorable thermodynamic and transport properties compared to the conventional refrigerants utilized in vapor compression refrigeration applications. The pump power required for the proposed vapor absorption refrigeration system was found lesser than the power required to operate the compressor used in the conventional vapor compression refrigeration system. A possible arrangement of the absorption system for automobile application is proposed.

Performance Analysis of Solar-Assisted Refrigeration Cycle

2012 ◽  
Vol 170-173 ◽  
pp. 2504-2507
Author(s):  
Lin Wang ◽  
Shuang Ping Duan ◽  
Xiao Long Cui
Keyword(s):  
Refrigeration Cycle ◽  
Vapor Compression ◽  
Absorption Refrigeration ◽  
Refrigeration System ◽  
Cycle System ◽  
Vapor Absorption ◽  
In Series ◽  
Vapor Compression Refrigeration ◽  
Absorption Refrigeration System ◽  
Vapor Absorption Refrigeration

Energy-conservation and environmental protection are keys to sustainable development of domestic economy. The solar-assisted cascade refrigeration cycle system is developed. The system consists of electricity-driven vapor compression refrigeration system and solar-driven vapor absorption refrigeration system. The vapor compression refrigeration system is connected in series with vapor absorption refrigeration system. Refrigerant and solution reservoirs are designed to store potential to keep the system operating continuously without sunlight. The results indicate that the system obtains pretty higher COP as compared with the conventional vapor compression refrigeration system. COP of the new-type vapor compression refrigeration system increases as sunlight becomes intense.

Review of Technology Used to Improve Heat and Mass Transfer Characteristics of Adsorption Refrigeration System

2016 ◽  
Vol 24 (02) ◽  
pp. 1630003 ◽  
Author(s):  
Anirban Sur ◽  
Randip K. Das
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Waste Heat ◽  
Transfer Characteristic ◽  
Low Grade ◽  
Transfer Performance ◽  
Refrigeration System ◽  
Adsorption Refrigeration ◽  
System A ◽  
Absorption Refrigeration System

Researchers proved that, heat powered adsorption refrigeration technology is very effective methods for reutilization of low-grade thermal energy such as industrial waste heat, solar energy, and exhaust gases from engines. But to make it commercially competitive with the well-known vapor compression and absorption refrigeration system, the processes require high rates of heat and mass transfer characteristic between adsorbate and adsorbent as well as externally supplied heat exchanging fluid. This paper reviews various techniques that have been developed and applied to enhance the heat transfer and mass transfer in adsorber beds, and also discuss their effects of the performance on adsorption system. A comprehensive literature review has been conducted and it was concluded that this technology, although attractive, has limitations regarding its heat and mass transfer performance that seem difficult to overcome. Therefore, more researches are required to improve heat and mass transfer performance and sustainability of basic adsorption cycles.

Experimental Analysis of a Laboratory-Scale Diesel Engine Exhaust Heat-Driven Absorption Refrigeration System as a Model for Naval Surface Ship Applications

2020 ◽  
Vol 36 (02) ◽  
pp. 152-159 ◽  
Author(s):  
Cüneyt Ezgi ◽  
Sinem Bayrak
Keyword(s):  
Diesel Engine ◽  
Experimental Analysis ◽  
Alternative Energy ◽  
Cooling Capacity ◽  
Energy Sources ◽  
Naval Academy ◽  
Absorption Refrigeration ◽  
Refrigeration System ◽  
Exhaust Heat ◽  
Absorption Refrigeration System

Decreasing industrial energy sources and major environmental problems caused by uncontrolled energy consumption have led to studies on alternative energy sources. This study presents a design and experimental analysis of an exhaust gas-driven absorption refrigeration system for the purpose of air conditioning by using the exhaust heat of a diesel engine, which is installed in the Naval Academy Mechanics Laboratory. The diesel engine is loaded with a dynamometer, and water and ammonia are used as an absorbent and refrigerant, respectively. At various diesel engine loads, cooling capacity and coefficient of performance (COP) of the absorption refrigeration system are calculated. Experimental results have indicated the cooling capacity as 1.098 kW at a maximum engine power of 4.9 HP. The highest COP value in the designed system has been calculated to be .3022 for the generator temperature of 160 C. Although the COP of refrigeration is low, the absorption refrigeration system can be provided a great cooling load from the exhaust heat of diesel engines and can be used in naval surface ships. In addition to energy efficiency of naval surface ships, infrared and acoustic signature can be minimized and a ships susceptibility can be dramatically reduced.

scholarly journals TESTS OF ARRANGEMENTS IN A PROTOTYPE OF A STEAM GENERATOR IN AN ABSORPTION REFRIGERATION SYSTEM

2019 ◽  
Vol 18 (2) ◽  
pp. 70
Author(s):  
R. F. M. Santos ◽  
K. L. Cezar ◽  
P. A. C. Rocha ◽  
R. J. P. Lima ◽  
M. E. V. da Silva ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Steam Generator ◽  
Lithium Bromide ◽  
Heat Transfer Process ◽  
Heat Flow Rate ◽  
Absorption Refrigeration ◽  
Refrigeration System ◽  
Governing Factor ◽  
Absorption Refrigeration System ◽  
Internal Convection

This paper presents a proposal to optimize the prototype II of a steam generator, developed by the Cooperativa de Pesquisa Norte/Nordeste de Gas Natural, RECOGÁS - UFPB, which is a component of an absorption refrigeration system of water and lithium bromide triggered by direct burning of natural gas. The optimization was carried out through changes in the arrangement, geometry, and number of the heat exchanger pipes. It was developed a computational code using F-Chart software Engineering Equation Solver® (EES), applying the principles of heat transfer to all the different geometries. As a result, their respective coefficients of heat transfer, heat flow rate and other parameters of the process were obtained. The findings are organized in a table and represented in graphs generated by the EES software, allowing to verify which factors had a greater influence on the process, as well as the most efficient geometries. Internal convection was identified as the governing factor in the heat transfer process. Some of the geometries presented satisfactory values to the product of overall heat transfer coefficient and surface area (UA) and also to the heat transfer rate in the steam generator. Other ones presented a better thermal efficiency relation with the amount of volume occupied in the steam generator. Some geometries did not present satisfactory values under any aspect.

Mathematical Analysis on a Special Adsorption Refrigeration System Suitable for Solar Energy System

2014 ◽  
Vol 953-954 ◽  
pp. 119-122
Author(s):  
Yan Ling Liu ◽  
Xue Zeng Shi ◽  
Yuan Yu
Keyword(s):  
System Performance ◽  
Energy System ◽  
Cooling Capacity ◽  
Refrigeration System ◽  
Adsorption Refrigeration ◽  
Study Results ◽  
Actual Use ◽  
Working Principle ◽  
Set Up ◽  
New System

s. In this paper, a new adsorption refrigeration system is designed and calculated. In this system, there are two beds, two condensers and two evaporators. The working principle is explained and specified in this paper. And mathematical models are also set up and through calculation, the system performance is analyzed and evaluated.Theory study results demonstrate that the new system nearly has the same cooling capacity as conventional system and this kind of system can be adopted in actual use.

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