Two-stage double-effect ammonia/lithium nitrate absorption cycle

2016 ◽  
Vol 94 ◽  
pp. 228-237 ◽  
Author(s):  
R. Ventas ◽  
A. Lecuona ◽  
C. Vereda ◽  
M. Legrand
Keyword(s):  
Double Effect ◽  
Lithium Nitrate ◽  
Two Stage ◽  
Nitrate Absorption ◽  
Absorption Cycle

Energy, Exergy and Economic Analysis of a Solar Hybrid Power System Integrated Double-Effect Vapor Absorption System-Based Cold Storage

2019 ◽  
Vol 27 (02) ◽  
pp. 1950018 ◽  
Author(s):  
Ramen Kanti De ◽  
Aritra Ganguly
Keyword(s):  
Power System ◽  
Cold Storage ◽  
Life Cycle Cost ◽  
Energy Demand ◽  
Cooling System ◽  
Double Effect ◽  
Hybrid Power System ◽  
Hybrid Power ◽  
Vapor Absorption ◽  
Absorption Cycle

In this paper, an attempt has been made to propose a multi-commodity cold storage to store a variety of high value perishable commodities round the year. To maintain the favorable micro-climate inside the cold storage space for the selected commodities, a cooling system based on double-effect vapor absorption cycle has been developed. To meet the year-round thermal and electrical load of the proposed cold storage, a solar thermal-PV-based hybrid power system has been designed. A computer program in MATLAB-R2017a has been developed to predict the year-round performance of the proposed system for a complete calendar year for the climatic condition of Kolkata, India (22.57∘N, 88.36∘E). An exergy analysis of the proposed system has also been included in the study. Finally, a life cycle cost analysis of the integrated solar hybrid power system has been performed to estimate its payback period. The study reveals that the mutual generation from 45 numbers of parabolic trough collectors along with 225 numbers of SPV modules is sufficient to meet the year-round energy demand of the proposed cold storage. The study thus reinforces the need and viability of double-effect VAR system-based multi-commodity cold storage powered through solar energy for developing countries like India, where significant amount of agricultural production gets wasted due to inadequate warehousing facilities.

scholarly journals Thermodynamic Analysis of a Solar Combined Ejector Absorption Cooling System

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Doniazed Sioud ◽  
Raoudha Garma ◽  
Ahmed Bellagi
Keyword(s):  
Cooling System ◽  
Lithium Bromide ◽  
Cooling Water ◽  
Double Effect ◽  
Cycle Performance ◽  
Working Fluid ◽  
Absorption Cooling ◽  
Single Effect ◽  
Absorption Cycle ◽  
Absorption Cooling System

The objective of this paper is to investigate theoretically a solar driven 60 kW absorption cooling system. The system is constituted of a combined ejector single-effect absorption cycle coupled with a linear Fresnel solar concentrator and using water/lithium bromide as working fluid. The combined ejector single-effect absorption cycle exhibits high performances, almost equal to that of double-effect absorption device. However, higher driving heat temperatures are required than in the case of conventional single-effect machines. A mathematical model is set up to analyze the optical performance of the linear Fresnel concentrator. Simulations are carried out to study the overall system performance COPsystem and the performances of the combined absorption machine COPcycle for generator driving temperatures and pressures in the ranges 180°C – 210°C and 198 kPa – 270 kPa, respectively. Further, the effect of operating parameters such as the cooling medium and chilled water temperatures is investigated. A maximum cycle performance of 1.03 is found for a generator pressure of 272 kPa and chilled and cooling water temperatures of 7°C and 25°C, respectively. A case study is investigated for a typical summer Tunisian day, from 8:00 to 18:00. The effect of ambient temperature and solar radiation on cycle and system performances is simulated. The optical performances of the concentrator are also analyzed. Simulation results show that between 11:00 and 14:00 the collector efficiency is 0.61 and that the COPcycle reaches values always higher than 0.9 and the COPsystem is larger than 0.55. Globally the performances of the investigated cycle are similar to those of double-effect conventional absorption system.

Experimental Evaluation of a Solar Intermittent Refrigerator Working With the Mixtures NH3 – LiNO3 and NH3 – LiNO3 – H2O

2011 ◽  
Author(s):  
G. Moreno-Quintanar ◽  
W. Rivera ◽  
R. Best
Keyword(s):  
Rural Communities ◽  
Solar Energy ◽  
Binary Mixture ◽  
Ternary Mixture ◽  
Electric Energy ◽  
Lithium Nitrate ◽  
Lower Viscosity ◽  
Expansion Valve ◽  
Two Stages ◽  
Absorption Cycle

Solar energy could help to reduce the request of electric energy which is generated via hydrocarbons, having the possibility to provide energy to rural communities which do not have it through the conventional distribution. The application of solar system on refrigeration has a great range of development, that will have a competitive cost when the hydrocarbons diminish. An intermittent solar refrigerator that works with the absorption cycle is studied in the Center of Research on Energy of UNAM. It was designed to produce 8 kg of ice. The refrigerator consists of a condenser, an expansion valve, an evaporator and a generator/absorber. A compound parabolic concentrator (CPC) receives solar energy and turns into thermal energy. It is concentrated in the cylindrical receiver that works as generator or absorber. Being intermittent, the refrigerator performs two stages to complete a refrigeration cycle: a generation-condensation stage and another of evaporation-absorption stage. The present work focuses on the evaluation of the generation-condensation stage. One of the working mixture is ammonia-lithium nitrate (NH3 – LiNO3) that presents some advantages over the common mixtures such as the avoiding of rectification and working with relatively low manometric pressures. A disadvantage is that it presents crystallization at low concentrations. The other working mixture is ammonia-lithium nitrate-water (NH3 – LiNO3 – H2O) with higher conductivity and lower viscosity than the ammonia/lithium nitrate. Several test were made at different solution concentrations for both mixtures, binary mixture (NH3 – LiNO3) and ternary mixture (NH3 – LiNO3 – H2O). Comparing the performance of the system operating with the two mixtures, it was found that with the ternary mixture the solar coefficients of performance can be up to 24% higher than those obtained with the binary mixture.

Sign in / Sign up

Export Citation Format

Share Document