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.

Performance Investigation of Single Adsorption Refrigeration System Driven by Solar Heat Storage

2018 ◽  
Vol 26 (03) ◽  
pp. 1850025
Author(s):  
Hicham Boushaba ◽  
Abdelaziz Mimet
Keyword(s):  
System Performance ◽  
Heat Storage ◽  
Cooling Capacity ◽  
Operating Conditions ◽  
Coefficient Of Performance ◽  
Solar Irradiation ◽  
Cooling Power ◽  
Condensation Temperature ◽  
Adsorption Refrigeration ◽  
Solar Heat

The aim of this paper is to provide a global study of an adsorption refrigeration machine driven by solar heat storage and collected by parabolic trough collector. The system operates with ammonia (as refrigerant) and activated carbon (as adsorbent). A mathematical model interpreting the progression of the heat and the mass transfer at each element of the prototype has been developed. The solar irradiation and the real ambient temperature variations corresponding to a usual summer day in Tetouan (Morocco) are considered. The system performance is evaluated trough specific cooling power (SCP) as well as solar coefficient of performance (SCOP), which was estimated by a dynamic simulation cycle. The pressure, temperature and adsorbed mass profiles in the Adsorber have been calculated. The effects of significant design and operating parameters on the system performance have been investigated. The results show the capability of our system to realize an encouraging performance and to overcome the intermittence of the adsorption refrigeration machines. For a daily solar irradiation of 18[Formula: see text]MJ[Formula: see text]m[Formula: see text] and operating conditions of evaporation temperature [Formula: see text]C, condensation temperature [Formula: see text]C and generation temperature [Formula: see text]C, the results show that the process could achieve an SCP of 115[Formula: see text]W[Formula: see text]kg[Formula: see text] and it could produce a daily specific cooling capacity of 3310[Formula: see text]kJ[Formula: see text]kg[Formula: see text], whereas its SCOP could attain 0.141.

Application of Suction Line Heat Exchanger on Adsorption Refrigeration System

2004 ◽  
Vol 126 (1) ◽  
pp. 671-673 ◽  
Author(s):  
Wen Wang ◽  
Tianfei Qu ◽  
Zhonghua Li ◽  
Ruzhu Wang
Keyword(s):  
Experimental Data ◽  
Heat Exchanger ◽  
Cooling Capacity ◽  
Cycle Performance ◽  
Refrigeration Cycle ◽  
Refrigeration System ◽  
Adsorption Refrigeration ◽  
Suction Line ◽  
Suction Line Heat Exchanger ◽  
Condensed Liquid

Quantitative thermodynamic analysis demonstrates that an adsorption refrigeration cycle could get higher cycle performance by employing a suction line heat exchanger (SLHX). Low temperature evaporated gas not only helps to cool down the adsorbent, it further increases the cooling output by recovering heat and cooling the condensed liquid. Experimental data also verifies that a SLHX recovers heat from the evaporated gas and helps the evaporator to provide higher cooling capacity.

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 COP enhancement of vapour compression refrigeration system using dedicated mechanical subcooling cycle

2020 ◽  
Vol 39 (3) ◽  
pp. 776-784
Author(s):  
T.S. Mogaji ◽  
A. Awolala ◽  
O.Z. Ayodeji ◽  
P.B. Mogaji ◽  
D.E. Philip
Keyword(s):  
System Performance ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Condensation Temperature ◽  
Refrigeration System ◽  
Wide Range ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration ◽  
Vapour Compression ◽  
Better Than

This study focused on development of an improved vapour compression refrigeration system (IVCR system). Dedicated mechanical subcooling cycle is employed in attaining the developed IVCR system. The system is composed of two cycles cascade refrigeration system working with R134a. It consists of a rectangular shape with total storage space of 0.582 m3, made of galvanized mild steel and internally insulated with 0.05 m polystyrene foam. Tests under a wide range operating temperature conditions were carried out on the developed IVCR system. Performance evaluation of the system was characterized in terms of cooling capacity and coefficient of performance (COP). Experimental results showed that the COP of the subcooled system improved better than that of the main system from 18.0% to about 33.5% over an evaporating temperature range of -10 to 30oC. It can be concluded that the use of dedicated sub cooling cycle in VCR system is more efficient and suitable for the betterment of thermal system performance. Keywords: Vapour compression Refrigeration system, Coefficient of performance, dedicated subcooled system, Condensation temperature, Evaporation temperature.

Investigation on Influence of Solar Radiation on Performance of Solar Adsorption Refrigeration System

2014 ◽  
Vol 953-954 ◽  
pp. 57-60
Author(s):  
Xiang Bo Song ◽  
Xu Ji ◽  
Ming Li ◽  
Jie Qing Fan ◽  
Bin Luo ◽  
...  
Keyword(s):  
Solar Radiation ◽  
System Performance ◽  
Refrigeration System ◽  
Adsorption Refrigeration ◽  
Bed Temperature ◽  
The Relationship

This article conducts the research on the relationship between the solar radiation and the adsorption bed temperature, the adsorption bed pressure and the system performance, and obtains that the solar radiation indirectly influences the system refrigeration performance through influencing the adsorption bed temperature and adsorption bed pressure. And in a certain range, the bigger solar radiation is, the higher adsorption bed temperature is, the system refrigeration efficiency is higher, the maximum refrigeration efficiency is 0.122.

scholarly journals Influential factors and optimization analysis of adsorption refrigeration system performance

AIP Advances ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 105315
Author(s):  
Xueling Zhang ◽  
Feifei Wang ◽  
Xudong Lei ◽  
Yanling Wang ◽  
Qi Zhang ◽  
...  
Keyword(s):  
System Performance ◽  
Influential Factors ◽  
Refrigeration System ◽  
Adsorption Refrigeration ◽  
Optimization Analysis

Study on Solar Energy for Pre-Cooling Technology of Fruit and Vegetable

2014 ◽  
Vol 700 ◽  
pp. 37-41
Author(s):  
A Min Ji ◽  
Tian Tian ◽  
Bo Ning Tang
Keyword(s):  
Mathematical Model ◽  
Activated Carbon ◽  
Solar Energy ◽  
System Performance ◽  
Refrigeration System ◽  
Adsorption Refrigeration ◽  
Vacuum Tube ◽  
Rate Versus ◽  
Adsorption Temperature ◽  
Cooling Technology

This paper discusses the importance of per-cooling vegetable and fruit, establishes a mathematical model of the solar adsorption refrigeration system collector bed. It applies activated carbon - methanol as working pairs, takes solar vacuum tube－water cooled collector bed for refrigerating, adsorption temperature and adsorption rate versus time are calculated , draw the corresponding curve figure. Analyses solar adsorption refrigeration system performance and puts forward the improvement direction.

The Development of Intelligent Maintenance and Assessment Simulation System for Automotive Air-Conditioning

2013 ◽  
Vol 291-294 ◽  
pp. 911-915
Author(s):  
Xian Mei Zhao
Keyword(s):  
Distribution System ◽  
Air Conditioning ◽  
Simulation System ◽  
System Control ◽  
Refrigeration System ◽  
Gas Distribution ◽  
Intelligent Maintenance ◽  
Automotive Air Conditioning ◽  
Working Principle ◽  
Set Up

The paper introduces an intelligent maintenance and assessment simulation system for automotive air-conditioning. The system mainly includes the demonstration interfaces for working principle, refrigeration system, heating and gas distribution system, control system, assembling and disassembling training and assessment interface of compressor and clutch, and breakdown maintenance etc. Finally the faults simulation set up, description and repair instruction were introduced.

scholarly journals Influence of initial bed temperature on bed performance of an adsorption refrigeration system

2018 ◽  
Vol 22 (6 Part A) ◽  
pp. 2583-2595 ◽  
Author(s):  
Anirban Sur ◽  
Randip Das ◽  
Ramesh Sah
Keyword(s):  
Activated Carbon ◽  
Cycle Time ◽  
Cooling System ◽  
Cooling Capacity ◽  
Heat Transfer Fluid ◽  
Low Grade ◽  
Refrigeration System ◽  
Adsorption Refrigeration ◽  
Bed Temperature ◽  
Engineering Department

The study deals with the complete dynamic analysis (numerical and practical) of an existing adsorption refrigeration system. The adsorption refrigeration setup is available at Indian School of Mines (Dhanbad, India), Mechanical engineering department. The system operates with activated carbon (as an adsorbent) and methanol (as refrigerant).Numerical model is established base on energy equation of the heat transfer fluid (water) and transient heat and mass transfer equations of the adsorbent bed. The input temperature of heat source is 90?C, which is very low compared to other low-grade energy input refrigeration system. The thermo-physical properties of an adsorptive cooling system (using activated carbon?methanol pair) are considered in this model. In this analysis influence of initial bed temperature (T1) on the bed performances are analysed mathematically and experimentally. The simulation and practical results of this system show that the cycle time decreases with increase in initial bed temperature and the minimum cycle time is 10.74 hours (884 minutes for practical cycle) for initial bed temperature of 40?C. Maximum system COP and specific cooling capacity are 0.436 and 94.63 kJ/kg of adsorbent under a condenser and evaporator temperatures of 35?C and 5?C, respectively. This analysis will help to make a comparison between simulated and experimental results of a granular bed adsorption refrigeration system and also to meet positive cooling needs in off-grid electricity regions.

Thermo-Fluid Mechanics of Fluid Injection and Refrigeration System Performance Improvement

2007 ◽  
Author(s):  
B. G. Shiva Prasad ◽  
Philip Moeller ◽  
John Sheridan
Keyword(s):  
Performance Improvement ◽  
System Performance ◽  
Cooling Capacity ◽  
Heat Pumps ◽  
Control Technique ◽  
Fluid Injection ◽  
Refrigeration System ◽  
Flow Process ◽  
Design And Optimization ◽  
Flowing Stream

Injecting a fluid into a flowing stream is a common and powerful flow control technique to improve the flow process or performance of downstream components and machinery. This paper presents an application of such a technique to scroll compressors for improving the cooling capacity and efficiency of refrigerators and other heat pumps. It provides some insights into the physics of fluid injection and suggests methods for maximizing the benefits. Further, it discusses the need for CFD in system design and optimization and illustrates its application.

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