scholarly journals Thermodynamic cycle of lithium bromide absorption chillers with two-level absorption and generation processes and with associated mass flow

2020 ◽  
Vol 826 ◽  
pp. 012039
Author(s):  
O S Malinina ◽  
A V Kasyanov ◽  
A V Baranenko
Keyword(s):  
Mass Flow ◽  
Lithium Bromide ◽  
Thermodynamic Cycle ◽  
Absorption Chillers ◽  
Associated Mass

Thermodynamic cycle of Lithium bromide absorption chiller with two-stage absorption and three-stage generation with associated mass flow

2021 ◽  
Author(s):  
O. S. Malinina ◽  
A. V. Baranenko ◽  
Mushtaq A. Al-Furaiji ◽  
E. E. Lydova ◽  
K. A. Komarov
Keyword(s):  
Mass Flow ◽  
Lithium Bromide ◽  
Thermodynamic Cycle ◽  
Absorption Chiller ◽  
Two Stage ◽  
Associated Mass

scholarly journals Efficiency of lithium bromide absorption chiller with multi-stage absorption and generation processes with associated mass flow

2021 ◽  
Vol 5 (2) ◽  
pp. 9-17
Author(s):  
O. S. Malinina ◽  
◽  
A. V. Baranenko ◽  
M. A. Al-Furaiji ◽  
E. E. Lydova ◽  
...  
Keyword(s):  
Water Absorption ◽  
Mass Flow ◽  
Flow Rate ◽  
Lithium Bromide ◽  
Thermodynamic Cycle ◽  
Coefficient Of Performance ◽  
Absorption Chiller ◽  
Heating Source ◽  
Multi Stage ◽  
Associated Mass

A study of the cycles of a lithium bromide–water absorption chiller with two-stage absorption and three-stage generation of a working substance vapor with an associated mass flow with different supply of the cooling medium to the apparatus has been carried out. The temperature of the heating source necessary for the implementation of the actual thermodynamic cycle of the Lithium Bromide– Water Absorption Chiller (LBWAC) and the most effective thermodynamic cycle has been determined. A comparative analysis of the cycle understudy with the sample cycle (one-stage cycle) LBWAC is carried out. Despite the lower values of the coefficient of performance (COP), the cycle under study provides a doubling of the cooling capacity of the machine, at the same flow rate of the heating source, which is an advantage when the flow rate of the heating source is limited. This circumstance is explained by the fact that in LBWAC with multi-stage absorption and generation, the heating source sequentially passes through three generator stages. Therefore, the degree of cooling in the chiller with the considered cycle is three times higher than this value of a single-stage LBWAC

scholarly journals Conversion of gas engine waste heat into cold using absorption chillers

2020 ◽  
Vol 168 ◽  
pp. 00046
Author(s):  
Georgii Karman ◽  
Yurii Oksen ◽  
Olena Trofymova ◽  
Yurii Komissarov ◽  
Borys Dizhevskyi ◽  
...  
Keyword(s):  
Air Conditioning ◽  
Waste Heat ◽  
Lithium Bromide ◽  
Thermodynamic Cycle ◽  
Cooling Capacity ◽  
Coolant Temperature ◽  
Gas Engine ◽  
Absorption Chillers ◽  
Full Conversion ◽  
Heating Medium

A possibility of gas engine waste heat conversion into cold for air conditioning in mines using lithium bromide absorption chillers is investigated. Dependencies of parameters of a thermodynamic cycle and energy indicators of chillers on temperatures of a heating medium and a coolant are obtained using mathematical modelling. It is shown that it is rational to use two chillers with sequential movement of a heating medium and a coolant through them in opposite directions for a full conversion of gas engine waste heat. COP of such a system is 0.733. This allows obtaining 2140 kW of cooling capacity with a coolant temperature of 7 °C when using a gas engine JMS-620 by Jenbacher.

scholarly journals Experimental investigation of a plate heat exchanger model for lithium bromide absorption chillers: first results

2019 ◽  
Vol 196 ◽  
pp. 00033
Author(s):  
Konstantin Stepanov ◽  
Dmitry Mukhin ◽  
Olga Volkova
Keyword(s):  
Experimental Investigation ◽  
Heat Exchanger ◽  
Lithium Bromide ◽  
Plate Heat Exchanger ◽  
Plate Heat ◽  
Absorption Chillers ◽  
First Results

In this paper the results of thermal-hydraulic tests of a sample of a perspective plate heat exchanger under the conditions of LBAHT is described. Working opportunity of the sample working under conditions of LBAHT has been confirmed by this research.

Turbocharger-Design Effects on Gasoline-Engine Performance

2005 ◽  
Vol 127 (3) ◽  
pp. 525-530 ◽  
Author(s):  
Theodosios Korakianitis ◽  
T. Sadoi
Keyword(s):  
Steady Flow ◽  
Mass Flow ◽  
Gasoline Engine ◽  
Pressure Ratio ◽  
Engine Performance ◽  
Thermodynamic Cycle ◽  
Final Choice ◽  
Design Point ◽  
Theoretical Considerations ◽  
Flow Experiments

Specification of a turbocharger for a given engine involves matching the turbocharger performance characteristics with those of the piston engine. Theoretical considerations of matching turbocharger pressure ratio and mass flow with engine mass flow and power permits designers to approach a series of potential turbochargers suitable for the engine. Ultimately, the final choice among several candidate turbochargers is made by tests. In this paper two types of steady-flow experiments are used to match three different turbochargers to an automotive turbocharged-intercooled gasoline engine. The first set of tests measures the steady-flow performance of the compressors and turbines of the three turbochargers. The second set of tests measures the steady-flow design-point and off-design-point engine performance with each turbocharger. The test results show the design-point and off-design-point performance of the overall thermodynamic cycle, and this is used to identify which turbocharger is suitable for different types of engine duties.

Concentration Measurement of Lithium Bromide Aqueous Solution by Electrical Resistivity

2010 ◽  
Author(s):  
Jian Sun ◽  
Lin Fu ◽  
Shigang Zhang ◽  
Wei Hou
Keyword(s):  
Aqueous Solution ◽  
Electrical Resistivity ◽  
Lithium Bromide ◽  
Measurement Methods ◽  
Concentration Measurement ◽  
Low Grade ◽  
Saving Energy ◽  
Resistivity Data ◽  
Absorption Chillers ◽  
Low Grade Heat

Absorption chillers have currently become an important device in saving energy because of its effectiveness in utilizing low grade heat. Lithium bromide is widely used as absorbent in this system. But there were few outstanding concentration measurement methods in practice before. In this paper, complete electrical resistivity data of lithium bromide aqueous solution for concentration measurement was given. The electrical resistivity of lithium bromide aqueous solution was measured at concentrations of 35–70 wt% of lithium bromide and temperatures of 10–100°C. Results of this work can meet the requirement of concentration measurement of lithium bromide in absorption chillers without extracting samples.

Design Improvements in LiBr Absorption Chillers for Solar Applications

1981 ◽  
Vol 103 (1) ◽  
pp. 56-61 ◽  
Author(s):  
Gershon Grossman ◽  
Joseph R. Bourne ◽  
Jonathan Ben-Dror ◽  
Yigal Kimchi ◽  
Isaiah Vardi
Keyword(s):  
Computer Simulation ◽  
Lithium Bromide ◽  
The Other ◽  
Effective Solution ◽  
Theoretical Evaluation ◽  
Absorption Chillers ◽  
Nominal Capacity ◽  
Solar Powered ◽  
Made In ◽  
Solar Applications

The present article describes a theoretical evaluation of two design improvements made in a lithium bromide absorption chiller which contribute substantially to its performance in solar applications. One is the addition of a solution preheater which allows for a considerable reduction in generator size and cost, and improves performance at part load. The other is the addition of an auxiliary generator which enables the chiller to operate at nominal capacity or higher at all times, while utilizing to a maximum the solar radiation available at the time, however small. This is an effective solution to the problem of backup required in all solar-powered systems. The evaluation has been performed by computer simulation and results are presented for the performance of the unit with different configurations of the above systems. The results indicate the limitations on the part of the load to be supplied by the preheater. They point toward the advantage of using an auxiliary generator in a separate shell from the solar-powered generator and with a separate condenser. Operating curves for the chiller with the design improvements are given.

The Modeling of Air-Cooled Absorption Chiller Integration in CHP System

2004 ◽  
Author(s):  
Xiaohong Liao ◽  
Patricia Garland ◽  
Reinhard Radermacher
Keyword(s):  
Control Strategies ◽  
Lithium Bromide ◽  
Absorption Chiller ◽  
Absorption Chillers ◽  
Operation Conditions ◽  
Bromide Solution ◽  
Exhaust Heat ◽  
Lithium Bromide Solution ◽  
Prime Movers ◽  
Chp System

Absorption chillers are well suited for the use of exhaust heat from prime movers, and they improve the heat utilization of Cooling, Heating, and Power (CHP) systems. An air-cooled absorption chiller eliminates the cooling tower and brings considerable advantages as compared to water-cooled chillers. However, the expensive capital cost and crystallization of LiBr (Lithium Bromide) solution in certain operation conditions restrict the commercialization of air-cooled LiBr absorption machines. This paper discusses the feasibility of air-cooled absorption in CHP systems, where the control strategies based on the application can avoid the occurrence of crystallization. By using the fundamental thermodynamic principle, steady-state thermodynamic modeling and simulation have been done in Engineer Equation Solver (EES) to predict the operation of air-cooled absorption chiller integration in CHP systems with special consideration of the crystallization limits. The data of field operation acquired from a CHP system at UMD are used for validation.

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