scholarly journals Implementation of a Single Effect Absorption LiBr-H2O Refrigeration Chiller by using Thermodynamic Modeling and Steady State Simulation

2019 ◽  
Vol 8 (2) ◽  
pp. 2900-2906
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Heat Source ◽  
Operating Parameter ◽  
High Heat ◽  
Cycle Performance ◽  
Refrigeration System ◽  
Single Effect ◽  
Steady State Simulation ◽  
The Impact

The objective of this research paper is to present steady state simulation model and EES program for design and thermodynamic analysis is used to predict the performance of single effect vapor absorption chiller. The working condition of steam is entering and exit to the generator. At that point, the program gives the thermodynamic properties of all purposes of the state, for example, design information each heat exchangers in the cycle and the overall performance of the cycle. The outcome is from EES program is utilized to contemplate the impact of structure parameters on cycle performance. In the conventional absorption refrigeration system dilute solution of LiBr is directly goes to the generator at inlet of generator in this type high heat source is required and increasing the area of the generator. In this paper is to present incorporation of heat reclaimer in the solution heat exchanger and the generator. The addition of one heat exchanger with increasing COP as well as reduced heat source and heat transfer area in the generator. This program gives the operating parameter at all state points, design value of all heat exchanger and design performance of the system. The refrigeration capacity of the system is 100TR. To check the performance of system by using changing flow rate of heat source, heat exchanger effectiveness. The output of this program and simulation results use for the sizing of new refrigeration system.

Dynamic Modeling of an Absorption Refrigeration System Using Ionic Liquids

2007 ◽  
Author(s):  
Weihua Cai ◽  
Mihir Sen ◽  
Samuel Paolucci
Keyword(s):  
Ionic Liquids ◽  
High Heat ◽  
Cycle Performance ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Refrigeration System ◽  
High Heat Capacity ◽  
Single Effect ◽  
Absorption Refrigeration System ◽  
Thermal And Chemical Stability

Ionic liquids are generally non-volatile, non-toxic, and nonflammable with high heat capacity, high density, and high thermal and chemical stability. This paper considers their use as absorbents in an absorption refrigeration cycle. A dynamic model of a single-effect absorption refrigeration cycle using ionic liquids as absorbent is developed. Modeling of the cycle performance requires thermodynamic properties which are obtained from an equation of state for the refrigerant-absorbent mixture (solution). The transient response of the cycle is investigated. Some design and operating parameters that affect the cycle performance are identified.

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.

Change in Distillation Column Control Philosophy Using Dynamic Simulation

2019 ◽  
Vol 15 (3) ◽  
Author(s):  
Kanubhai Parmar ◽  
Sukanta Dash ◽  
Sunil Patil ◽  
Garimella Padmavathi
Keyword(s):  
Steady State ◽  
Dynamic Simulation ◽  
Operating Parameter ◽  
Simulation Models ◽  
Composition Control ◽  
Aspen Hysys ◽  
Steady State Model ◽  
Process Behavior ◽  
Steady State Simulation ◽  
Bottom Product

AbstractAt condensate stripper of a cracker plant with design control philosophy for composition control pant was facing operational difficulty. Due to disturbance in operating parameter column was becoming unstable and product was getting offspec w.r.t. desired purity. One of the applications of dynamic simulation is to troubleshoot the challenges related to control philosophy in practical application. Since steady-state simulation models cannot predict behavior with respect to time, initially steady state model and finally a dynamic model was developed in Aspen HYSYS. The model is used to study the process behavior for existing control philosophy and proposed philosophy. To avoid column puncture and without waiting for plant shut down the existing Temperature Indicator (TI) considered as Temperature Indicator Controller (TIC) for the study. A new control philosophy was developed based on the response of variables after disturbances in feed rate and composition. The revised control philosophy has been implemented and is now working satisfactorily, providing stabilized operation of the column with consistent bottom product quality. This has helped to reduce the loss of C2s in the bottom stream by about 700 ppm, for savings of about $100,000 USD per year.

The steady-state modeling and optimization of a refrigeration system for high heat flux removal

2010 ◽  
Vol 30 (16) ◽  
pp. 2347-2356 ◽  
Author(s):  
Rongliang Zhou ◽  
Tiejun Zhang ◽  
Juan Catano ◽  
John T. Wen ◽  
Gregory J. Michna ◽  
...  
Keyword(s):  
Heat Flux ◽  
Steady State ◽  
High Heat ◽  
High Heat Flux ◽  
Refrigeration System ◽  
Modeling And Optimization

Steady-State Simulation of an Automotive Air Conditioning System Running on CO2

2007 ◽  
Author(s):  
Pedro P. Morais Filho ◽  
Jose´ Alberto R. Parise ◽  
Rui P. Marques da Silva
Keyword(s):  
Steady State ◽  
Cycle Performance ◽  
Algebraic Equations ◽  
Climate Control ◽  
Ambient Temperatures ◽  
Automotive Air Conditioning ◽  
Linear Algebraic Equations ◽  
State Regime ◽  
Suction Line Heat Exchanger ◽  
Steady State Simulation

This work presents a semi-empirical simulation of an automotive climate control system equipped with a transcritical vapor compression cycle running on carbon dioxide. The cycle components (a compressor, a throttling valve, an evaporator, a gas cooler, a suction accumulator and a suction line heat exchanger) were modeled to study the operation of the system, in the steady-state regime, under high ambient temperatures. The model took into account the severe conditions of tropical climates since the temperature at the inlet of the gas cooler is one of the predominant factors in the transcritical cycle performance. To assess the performance of the cycle, the thermodynamic model, reduced to a set of non-linear algebraic equations, was solved by a modified Newton-Raphson method. Reasonable agreement was found when results predicted by the model were compared with experimental data available in the literature.

SIMULATION OF A SIMPLE VAPOUR-COMPRESSION REFRIGERATION SYSTEM USING R134a

2016 ◽  
Vol 78 (9-2) ◽  
Author(s):  
Mohd Yusoff Senawi ◽  
Farah Wahidah Mahmod
Keyword(s):  
Steady State ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Input Coefficient ◽  
Work Input ◽  
Compressor Work ◽  
Computerized Simulation ◽  
Steady State Simulation ◽  
Vapour Compression ◽  
Isentropic Efficiency

A computerized simulation of a simple single-stage vapour-compression refrigeration system has been made. The steady-state simulation uses the accurate property correlations developed by Cleland for refrigerant R134a. The inputs to the program are: evaporator pressure, condenser pressure, superheating at evaporator outlet, subcooling at condenser outlet and compressor isentropic efficiency. The program outputs are: refrigerating effect, compressor work input, coefficient of performance (COP) and suction vapour flow rate per kW of refrigeration. An increase in the evaporator pressure from 150 to 250 kPa improves the COP by 40%. The COP is decreased by 35% when the condenser pressure is increased from 1000 to 1500 kPa. Increasing the superheat at the evaporator outlet from 0 to 160C improves the COP by 2.6%. An increase in subcooling at the condenser outlet from 0 to 160C increases the COP by 20%. The COP is improved by 150% when the compressor isentropic efficiency is increased from 0.4 to 1.

Research on Simulation of Marine Refrigeration System Based on Simulink

2014 ◽  
Vol 552 ◽  
pp. 61-65
Author(s):  
Yun Xin Liu
Keyword(s):  
Steady State ◽  
Parameter Method ◽  
Refrigeration System ◽  
Time Operation ◽  
Expansion Valve ◽  
True Time ◽  
Set Up ◽  
Steady State Simulation ◽  
Partition Method ◽  
Operation And Management

A simulation based on simulink was set up to investigate the performance of marine refrigeration system. For the simulator focused on the operation and management, so the steady state simulation algorithm is to be used to build simulator of the whole system, it gives consideration to both efficiency and precision of simulation calculation, real-time of operation and management is increased. Compressor thermal model is simple, most of that use steady-state model with no iterative computation. Due to the need of teaching and simulation operation, we use lumped parameter method and partition method to establish mathematical model of Condenser, evaporator, expansion valve, evaporator pressure regulator, cold storage and other parts. True-time operation and the appraisal function has developed. The simulation result accorded well with the experiment result. This model precision is high and timely. It was acceptable used in the ships refrigeration system's operation.

scholarly journals The impact of using of a DWHR heat exchanger on operating costs for a hot water preparation system and the amount of carbon dioxide emissions entering the atmosphere

2018 ◽  
Vol 45 ◽  
pp. 00052 ◽  
Author(s):  
Aleksandra Mazur
Keyword(s):  
Carbon Dioxide ◽  
Heat Exchanger ◽  
Heat Source ◽  
Carbon Dioxide Emissions ◽  
Hot Water ◽  
Operating Costs ◽  
Alternative Variant ◽  
Hot Water Supply ◽  
The Impact ◽  
Positive Effect

The article analyzes the annual operating costs for several hot water preparation systems and their impact on the environment; also estimating the emission of pollutants, mainly carbon dioxide CO2, which enters the atmosphere as a result of the use of heating installations. The article also investigated the impact of installing a DWHR heat exchanger on a sewage system, draining graywater from the shower on the annual operating costs incurred by users of hot water supply installations. For each heat source an alternative variant was adopted, in which the installation was additionally equipped with a heat exchanger. The amount of annual savings resulting from the installation of a vertical DWHR heat exchanger was determined, depending on the heat source for the hot water preparation system and the duration of the shower bath per one inhabitant. For the same dependencies, the level of reduction of carbon dioxide emissions into the atmosphere was also determined, as a positive effect of using the installation with a heat exchanger.

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