ammonia water (NH3-H2o) diffusion vapor absorption refrigeration system

1.Vapor absorption refrigeration system based on ammonia-water is one of the oldest refrigeration systems.
2.An absorption refrigeration system uses a heat source (e.g., geothermal energy, solar energy, and waste heat from steam plants, and even natural gas when it is at a relatively low price.) to provide the energy needed for the cooling process.
3.Quite similar to a vapor compression system.
4.The compressor is replaced by a generator and absorber.
5.Ammonia is used as a refrigerant i.e. R-717 and Water as an absorber.
6.Condensation, expansion and evaporation processes are the same as the VCR system.

1. Study of Ammonia-Water (NH3-H2O) Diffusion Vapor Absorption Refrigeration System JAGANATH Ammonia - NH3

2. INTRODUCTION OBJECTIVES LITERATURE SURVEY WORKING PRINCIPLE DISCUSSION ON COP MERITS AND DIMERITS APPLICATIONS EXPERIMENTAL RESULTS CONCLUSION FUTURE SCOPE REFERENCES CONTENTS

3. Vapor absorption refrigeration system based on ammonia-water is one of the oldest refrigeration systems. An absorption refrigeration system uses a heat source (e.g ., geothermal energy, solar energy, and waste heat from steam plants, and even natural gas when it is at a relatively low price. ) to provide the energy needed for the cooling process . Quite similar to vapour compression system. Compressor is replaced by generator and absorber. Ammonia is used as refrigerant i.e. R-717 and Water as absorber. Condensation , expansion and evaporation processes are same as VCR system. INTRODUCTION

4. To make effective refrigeration by using low grade energy. For waste heat utilization to get refrigeration effect. To built eco-friendly refrigeration system. To provide noiseless and vibration less refrigeration system. OBJECTIVES

5. LITERATURE SURVEY Sl. No RESEARCH PAPER DESCRIPTION 1. Comparison of the performances of absorption refrigeration cycles, by Z crepinsek ; goricanec ; J.Krope This paper discusses about the performance of absorption refrigeration cycles that are used for refrigeration temperatures below 0ºc with different compositions and the performance factor they are considered are COP. And also operation of the system is carried out in two different cycles namely, single effect refrigeration and half effect absorption cycle. 2. Analysis of Ammonia –Water (NH3-H2O) Vapor Absorption Refrigeration System based on First Law of Thermodynamics, by Satish Raghuvanshi , Govind Maheshwari The objective of this paper is to present empirical relations for evaluating the characteristics and performance of a single stage Ammonia water (NH3-H2O) vapor absorption system An energy analysis of each component has been carried out and numerical results for the cycle are tabulated. 3. Experimental Investigation of Vapor Absorption Refrigeration Cycle for Automobile Cabin Cooling, by Sanket Shrotri , Shubham Mulay , Prof. Sahadev Jadhav The main motive behind experimentations was to check the feasibility of implementation of VARS in cars for cabin cooling. Since heat recovered from exhaust gases is utilized in VARS. Since performance of any thermodynamic system is dependent on temperatures, variation in performance of VARS system with respect to various temperatures is studied.

6. WORKING PRINCIPLE 1 . Absorber, 2 . Generator, 3. Condenser, 4. Temperature indicator fig: diffusion vapor absorption refrigeration system 2

7. Section NH 3 ( bar ) H 2 ( bar) H 2 (bar) Condenser 20 - - Evaporator inlet 1.5 - 18.5 Evaporator exit 2.3 - 17.7 Generator top 15.5 4.5 - WORKING PRINCIPLE PRESSURE AT DIFFERENT SECTIONS IN THE SYSTEM fig: diffusion vapor absorption refrigeration system

8. DISCUSSION ON COP The COP depends on the main three operating temperatures: Temperature of the heat source (Generator temperature) Temperature of Condenser/ Absorber (They can be different) Temperature of the refrigeration space (Evaporator temperature ) Hot source should be as high as possible Condenser/Absorber should be low The VARS offer low COPs due to energy requirement in the bubble pump and also due to losses in the evaporator because of the presence of hydrogen gas. In addition, since the circulation of fluids inside the system is due to buoyancy and gravity, the heat and mass transfer coefficients are relatively small, further reducing the efficiency. COP is given by: COP = =  

9. EXPERIMENTAL RESULTS a) Effect of Generator temperature (T G ) on Coefficient of Performance:- b ) Effect of Absorber Temperature on Coefficient of Performance :-

10. EXPERIMENTAL RESULTS c ) Effect of Evaporator temperature ( T E ) on Coefficient of Performance:- d) Effect of Effectiveness of Heat exchanger on Coefficient of Performance:-

11. MERITS Excellent for waste heat utilization Environmental friendly Wide operational range + 5 o C to −55 o C. Low maintenance cost – no moving parts. Can be built for hug working capacities. (even for 1000 TR ). Can operate well for over 25 years. Load variation does not effect the performance of VARS.

12. DIMERITES Efficiency is low Take long time to produce cooling effect. COP of vapor absorption refrigeration system is low. Initial cost of the VAR system is high as compared to VCR system

13. APPLICATION For domestic purpose. For storage of medicine, dairy items, blood storage. It can be used in thermal power plants. In planes, trains, cars for air conditioning systems.

14. CONCLUSION COP of the system is less then unit. Operating temperature of system is above 100 C As the generator Temperature increases, the COP of the system decreases. As the Evaporator Temperature decreases, the COP of the system increases .

15. VARS system can improve refrigerating unit, reduce energy cost of refrigerating unit and has notably social and economic benefit. India is among the world leaders in agricultural production however much of our produce goes waste due to absence of proper storage facilities. Solar energy can be used as major source of heat to get refrigeration effect. To get eco-friendly system. FUTURE SCOPE

16. Z Crepinsek ; Goricanec ; J.Krope ; comparison of the performances of absorption refrigeration cycles; issue 3; volume 4; page no 60-76; July 2009 Satish Raghuvanshi , Govind Maheshwari ; Analysis of Ammonia –Water (NH3-H2O) Vapor Absorption Refrigeration System based on First Law of Thermodynamics ; Issue 8 , Volume 2, August-2011 Experimental Investigation of Vapour Absorption Refrigeration Cycle for Automobile Cabin Cooling; Shubham Mulay , Sahadev Jadhav ; Volume 5; Issue 6; June 2017 K. Balaji ; R. senthil kumar ; Study of vapour absorption using waste heat in sugar industry; issue8; volume 2; page no 34-39; Aug 2012 Tarik Shaikh ; Prof. Yogesh J. Morabiya ; Review Of Solar Absorption Refrigeration System Using Libr -Water and Simulate the Performance of the System; issue 2; volume 2; page no 57-60; March 2013 REFERENCES

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