%��������� CONVENTIONAL AMMONIA REFRIGERATION SYSTEM - AMMONIA CHARGE CALCULATIONS FOR 350 TR CAPACITY. ��a$7�T �K�<2;� �����֊tT��5�Ԧ���PI�������n����1���¶��‰��K���~��&��[d�!O��8���n6�-�cD*]����i��^K���Gwk��k��h�)]\�k���7�"E��RJ#��k\`�{��f~Mq��%�Y�*3j�wduUú�-�/Y5LΪ�:0f� ���v_F�����v8�,w��v�>���?h�>_y�o�� xu3���% �`�i��: �����l�\��sXc� G5�=�70�[�e�ߖF�U�Nt�K֣5��ޤCd��=�nj�r�>���q�S}��V�� A�EB� CT@/��Iub�y��Fx21�o@� A'�)C���\'zP&]h�-��珫�}�8�:d�ji΃R3H�Z �R�A�V�_%�YIN|�vu �frO')p���ts����{�'����p�UA�� ����f6 �?�Sd�0X���(�]���;��d Equipment Volume Volume Vapour Liquid Vapour NH3 Liquid NH3 Total NH3 … • Advise governments and code officials with information regarding ammonia. h��Sߋ1�W�X�$�_8��l��{�iЀ�����w&����E�X�lfg&3߷_F�A�2� jņ%ñ�@W� ������[�o�n�� �?���hW��ø���ršJܥ.��x� h2�u;l�n��j��8y,�q^'䆊�})��q�D0�����i�c�ϺnFJ��)&).r�%>����ŴM�o�U��ܥR�Q������#x���{@���u��yoۏ���[�Y��u�O��o��*�_؞;0)]HM�9��+1=� �(�N(:��EP2�� Particles usually result from soldering and welding residue, the reaction between refrigerant and oil, etc. 4. i�R�$��y���t��hR���~1���톥RId�ґ��D[����T�+'��2ed�ސKI(ەs�%W�sA 鏝W훞��֑3Q����_��ԟ�_��R���퇎�����kLh��b Vy��(�7��Te�Uٻ�����`���MVF��Q� Refrigerant Flow Path. 2010-13-A-AL KEY LESSONS SUMMARIZED: • For the design of ammonia refrigeration systems, avoid grouping multiple, large-capacity evaporators to a single set of control valves. Industrial refrigeration systems predominantly use natural refrigerants, primarily ammonia and more recently CO2 Energy efficiency and the effective operation of those systems are the key parameters for operators of the plants The focus of the white paper is the comparisons of hot gas defrost strategy control methods, both on the hot gas side as well as on the condensate drain NH 3 systems should therefore be purged with air or a non-flammable gas prior to starting the welding work in order to remove residual ammonia. 0 ‐ Ammonia has high operating efficiencies even at high temperatures and so can efficiently reject heat even in high ambient environments. The ingress of NC gases into a refrigeration . NC gases in the system will result in a decrease in system efficiency, both in terms of an increase in power consumption and reduced cooling capacity . B�S���=A-ô`�P�{Ԁ$@c$�&�΂fl�9��+h&i�=� ���GE�G�B�U�Z��6'�m���) V�Vَ� `mb�nLrBl/�2�?GΠ&�g�)�ys~$�����R Low Ammonia Charge Refrigeration Systems for Cold Storage | October 2014 (Version 1) 7 : Objectives : The primary objective this paper is to provideof a fundamental and unbiased assessment of the technologies andrefrigeration system designs available to the industry leaders which can ultimately lead to a substantially reduced ammonia charge for their cold storagefacilities. vapor, liquid, etc., the relative pressure level of the refrigerant and the direction of flow. It involves an obeisance that is only truly attainable through time. It is not intended for any other use. All com- ponents of the refrigeration system, e.g. So, this refrigerant is selected. �8�]�� MANAGING THE RISKS from ammonia refrigeration systems 11. All com- ponents of the refrigeration system, e.g. 104 Air Conditioning and Refrigeration Journal d January - March 2009 CMYK CMYK The plant consists of two systems each of 100 TR capacity and each system using five plate freezers, two 12- cylinder two-stage reciprocating compressors, … … Ammonia - Safety regulations - British Columbia - Handbooks, manuals, etc. Ammonia as a natural refrigerant should not be underestimated, which is why the set-up locations for NH3 chillers must comply with precise regulations. Ammonia is one alternative refrigerant for new, replacement, and existing refrigeration system designs, where compatible. expressed in gallons per For industrial refrigeration systems using ammonia as the. Ammonia refrigeration works much like Industrial Refrigeration systems using synthetic refrigerants, with the major exception being that it uses anhydrous ammonia as the refrigerant. PDF | On May 1, 2014, Suneel K Kalla published REFRIGERATION CYCLES AND SYSTEMS: A REVIEW | Find, read and cite all the research you need on ResearchGate from the manufacturers or the client, what would your system design process be, what system(s) would Statement of the cold and freezer storage conditions (raw materials and products). 109, Minimum Safety Criteria for a Safe Ammonia Refrigeration System (see 7.3). systems . #1005) is produced both naturally and as a byproduct of numerous man-made reactive … DCE REFRIGERATION PVT LTD. LOW CHARGE AMMONIA REFRIGERATION SYSTEM WITH HIGH SIDE FLOAT & NO RECEIVER- P&I DRAWING H.SIDE FLOAT No HP RECEIVER. vapor, liquid, etc., the relative pressure level of the refrigerant and the direction of flow. Ammonia refrigeration systems have traditionally employed evaporators supplied with liquid by either gravity flooding (with surge drums), or pumped overfeed (either with mechanical pumps or discharge gas rdriven vessels). 2 Foreword This Guide is the product of the research project "Safety of Ammonia Refrigerating Systems" sponsored by The Finnish Work Environment Fund, The Finnish Safety and Chemicals Agency (Tukes), VTT Technical Research Centre of Finland and companies using or producing refrigerating systems. When ammonia leaves the generator in the vaporized state some particles of water vapor are also carried with it, and these are removed in the analyzer and the rectifier. ENVIRONMENT 2. 2.0 DEFINITIONS safety laws for anhydrous ammonia refrigeration system operators. h�bbd``b`�� B H0ՁĄ�D03�X�������b``�J���� � �� endstream endobj startxref All piping mains, headers and branches should be identified as to the physical state of the refrigerant, i.e. Ammonia as a Refrigerant. FLAMMABILITY 6. National Standard for Equipment, Design, and Installation of Closed Circuit Ammonia Mechanical Refrigerating Systems (see 7.1), ANSI/ASHRAE 15-2010, Safety Standard for Refrigeration Systems (see 7.2), and IIAR Bulletin No. Particles usually result from soldering and welding residue, the reaction between refrigerant and oil, etc. Ammonia is one alternative refrigerant for new, replacement, and existing refrigeration system designs, where compatible. The purity of the anhydrous ammonia is vital to the properties that make it a good refrigerant. ENERGY EFFICIENCY 4. GEA Brewery Systems was one of the first refrigeration plant manufacturers to count on the natural refrigerant ammonia. Ammonia has a low boiling point (-28°F @ 0 psig), an ozone depletion potential (ODP) of 0.00 when released to atmosphere and a high latent heat of vaporization eight (8.17 at -28°F) times higher than R-12 and PDF | In this paper we have simulated a flow sheet of aqua ammonia refrigeration system using Cape Open simulator. 2. gases) from industrial ammonia refrigeration . Figure 1 : Horizontal Plate Freezer. Equipment Volume Volume Vapour Liquid Vapour NH3 Liquid NH3 Total NH3 Liters m3 % % Kg Kg Kg … Ammonia (NH3) combination is the most suitable working fluid pair for vapour absorption [10] Preethu Johnson and K. B. Javare Gowda, refrigeration system and that the problem of fossil FABRICATION OF SOLAR fuel and ozone layer depletion together with some THERMALVAPOUR ABSORPTION other advantages of ammonia water vapour REFRIGERATION SYSTEM, (IRJET) p-ISSN: absorption system and this system … fluorinated refrigeration systems. Essentially, the ammonia is the chemical that is contained within the system to remove heat from an area, and then dissipate it in another area. tors.1 Table 1 shows the required recirculating liquid flow rate. Maintenance work at ammonia refrigeration systems requiring welding, soldering or cutting must be performed with extreme caution: existing oil mists can lower the explosion limit of NH 3 /air mixtures. Refrigerant ? • Provide programs and publication of innovative designs and application of ammonia refrigeration. ‐ Ammonia/CO2 cascade refrigeration systems are at least as energy efficient as a traditional ammonia refrigeration system (Christensen 2006). Nowadays, ammonia refrigeration systems are still the backbone of the food industry. Basic closed cycle refrigeration system has changed very little since then Early refrigerants included ammonia, sulfuric ether, sulfur dioxide, methyl chloride Only ammonia secured a lasting role. 1469 0 obj <>stream The GEA Grasso Ammonia Dryer is a perfect supplement to your ammonia refrigeration system to ensure longer operational life as well as lower operating and maintenance costs. Basic Components Of A Refrigeration System. Nowadays, ammonia refrigeration systems are still the backbone of the food industry. Ammonia as a Refrigerant. ISBN 978-0-7726-5881-4 1. Refrigeration System Selection •Question that was asked. &��*T�� REFRIGERANT EVALUATION PROCESS 1. Energy efficiency. Publisher’s original name, Workers’ Compensation Board of British Columbia, also appears on publication. Excellent experience with ammonia. Mechanically pumped liquid overfeed system arrangement. 2 Foreword This Guide is the product of the research project "Safety of Ammonia Refrigerating Systems" sponsored by The Finnish Work Environment Fund, The Finnish Safety and Chemicals Agency (Tukes), VTT Technical Research Centre of Finland and companies using or producing refrigerating systems. Ammonia in refrigeration systems Previously published 1988 under title: Ammonia in refrigeration systems : manual of standard practice. 3. )�r�B{&/��e����-�T>�MyևnGN�U��\���[I���z�v�oX�`i<. 2.0 DEFINITIONS x�W�rE}߯hɷ]��~� �������G��e��U9=I��6v*kfg���t�����H�W�B������K�m( Introduction Refrigeration System with Pump Circulation Oil separator Compressor Condenser Evaporator Expansion valve 1 Oil cooler Refrigerant pump Receiver Liquid separator liquid/vapour mixture of refrigerant Oil HP liquid refrigerant HP vapour refrigerant LP vapour refrigerant LP liquid refrigerant 1 2 3 5 4 6 Danfoss Tapp_0015_02 04-2006 Compressor Control Why? (Ammonia Refrigeration Systems, ASHRAE 2018) He introduced his new machine at the Universal London Exhibition in 1862 and it quickly became popular around the world. Ammonia refrigeration systems have traditionally employed evaporators supplied with liquid by either gravity flooding (with surge drums), or pumped overfeed (either with mechanical pumps or discharge gas-driven vessels). Calculation of the thermal loads. If you have other processes that use regulated substances other than ammonia, refer to the main body of the General Guidance (and any other applicable industry-specific appendix) for information on compliance with the rule for those processes. An Introduction to Ammonia Refrigeration Systems. National Standard for Equipment, Design, and Installation of Closed Circuit Ammonia Mechanical Refrigerating Systems (see 7.1), ANSI/ASHRAE 15-2010, Safety Standard for Refrigeration Systems (see 7.2), and IIAR Bulletin No. fluorinated refrigeration systems. 2010-13-A-AL KEY LESSONS SUMMARIZED: • For the design of ammonia refrigeration systems, avoid grouping multiple, large-capacity evaporators to a single set of control valves. %%EOF �~���2����*�=�lQ�0�G��O1��R PERFORMANCE 3. An ammonia refrigeration system, like all vapor-compression refrigeration systems, are made up of a number of components that work together. 109, Minimum Safety Criteria for a Safe Ammonia Refrigeration System (see 7.3). system is inevitable, regardless of the refrigerant, pressures, or temperatures . In order to design the refrigeration system, we must accomplish: 1. The refrigeration system comprises a condenser for condensing vaporous ammonia to liquid ammonia coupled to an evaporator. – – Primary: to … %PDF-1.5 %���� liquid overfeed recirculated ammonia refrigeration system pdf Mechanically pumped liquid overfeed system arrangement. Given the amount of ammonia intro-duced to the arena’s refrigerant system GEA Brewery Systems was one of the first refrigeration plant manufacturers to count on the natural refrigerant ammonia. The two rinks’ refrigeration system used two flooded shell and tube evapora-tor (one for each rink), a high pressure refrigerant receiver, an evaporative con-denser and an ammonia charge of 1500 lbs. All piping mains, headers and branches should be identified as to the physical state of the refrigerant, i.e. In the United States, the ice made by ammonia refrigeration was used to keep railroad cars cold as they … This work presents an experimental study of an ammonia – water absorption refrigeration system using the exhaust of an internal combustion engine as energy source. In accordance with the present disclosure there is provided an efficient refrigeration system for cooling an environment using ammonia and sodium thiocyanate using a low grade heat source. The ammonia dryer removes water from the refrigerant cycles without having the machines shut down. In the ammonia-water absorption refrigeration system, ammonia works as the refrigerant and water works as the absorbent. The refrigeration system comprises a condenser for condensing vaporous ammonia to liquid ammonia coupled to an evaporator. MATERIAL CPMPATIBILITY 7. of a mechanically-pumped liquid overfed refrigerant loop, the refrigerant in the recirculating vessel. Statement of the cold and freezer storage conditions (raw materials and products). %PDF-1.3 With the ever increasing focus on energy consumption, ammonia systems are a safe and sustainable choice for the future. !�0� The two rinks’ refrigeration system used two flooded shell and tube evapora-tor (one for each rink), a high pressure refrigerant receiver, an evaporative con-denser and an ammonia charge of 1500 lbs. … By using experienced refrigeration professionals and trained personnel, owners can identify potential risks and determine the appropriate level of inspection for each system. Ammonia refrigeration was first used in an ice-making machine in 1858 by French engineer, Ferdinand Carre. 3 1.0 BACKGROUND/HISTORY OF USE Ammonia (chemical symbol NH3, United Nations Chemical I.D. Given the amount of ammonia intro-duced to the arena’s refrigerant system A list of the federal laws and regulations related to process safety, accident prevention, emergency planning, and release reporting may be found in Appendix C. Many anhydrous ammonia system operators know their systems inside and out. The Management of Health and Safety at Work Regulations 1999 (The Management Regulations) require employers to make and implement effective arrangements for assessing the risk and planning, organising, controlling, monitoring and reviewing the preventive and protective measures necessary to . in Industrial Refrigeration Systems Anhydrous Ammonia Release at Millard Refrigerated Services, Inc. January 2015 32 Hospital Admissions, 4 Placed in Intensive Care No. tors.1 Table 1 shows the required recirculating liquid flow rate. TOXICITY/SAFETY 5. ‐ Ammonia has high operating efficiencies even at high temperatures and so can efficiently reject heat even in high ambient environments. Sr No. in Industrial Refrigeration Systems Anhydrous Ammonia Release at Millard Refrigerated Services, Inc. January 2015 32 Hospital Admissions, 4 Placed in Intensive Care No. It keeps the refrigerant circuit dry and clean and your refrigeration system running efficiently. Refrigerant grade anhydrous ammonia is a clear, colorless gas or liquid and about 99.95% pure. Ammonia is one of the most efficient applications out there, with the application range from high to low temperatures. It is not intended for any other use. In accordance with the present disclosure there is provided an efficient refrigeration system for cooling an environment using ammonia and sodium thiocyanate using a low grade heat source. The Management of Health and Safety at Work Regulations 1999 (The Management Regulations) require employers to make and implement effective arrangements for assessing the risk and planning, organising, controlling, monitoring and reviewing the preventive and protective measures necessary to . 2. The condenser condenses the ammonia vapour using a heat exchanger. Ammonia is very efficient at this because it has a very low boiling point when liquid (-27F). So, this refrigerant is selected. The Myth Regarding the Use of Ammonia in a DX Designed refrigeration system The desire to use the world’s most energy-efficient refrigerant, ammonia, in DX-designed refrigeration systems has led to many challenges and has rightfully earned the reputation of being a poor solution that does not always work well. Essentially, the ammonia is the chemical that is contained within the system to remove heat from an area, and then dissipate it in another area. CONVENTIONAL AMMONIA REFRIGERATION SYSTEM - AMMONIA CHARGE CALCULATIONS FOR 350 TR CAPACITY. The components like absorber, and generator perform the regular functions. . stream expressed in gallons per For industrial refrigeration systems using ammonia as the. 3. PDF | On May 1, 2014, Suneel K Kalla published REFRIGERATION CYCLES AND SYSTEMS: A REVIEW | Find, read and cite all the research you need on ResearchGate MANAGING THE RISKS from ammonia refrigeration systems 11. 6 Where is ammonia used? Maintenance work at ammonia refrigeration systems requiring welding, soldering or cutting must be performed with extreme caution: existing oil mists can lower the explosion limit of NH 3 /air mixtures. Basic closed cycle refrigeration system has changed very little since then Early refrigerants included ammonia, sulfuric ether, sulfur dioxide, methyl chloride Only ammonia secured a lasting role. Calculation of materials flowrates given a product rate. Ammonia refrigeration system owners must develop and implement MI programs to ensure the continued reliability of system components and prevent the accidental release of ammonia. Water may enter the system as a result of installation, service, leakage, etc.. Ammonia has a number of benefits, which has been proven by many decades of application of ammonia refrigeration systems. In the ammonia-water absorption refrigeration system, ammonia works as the refrigerant and water works as the absorbent. Ammonia refrigeration systems have traditionally employed evaporators supplied with liquid by either gravity flooding (with surge drums), or pumped overfeed (either with mechanical pumps or discharge gas-driven vessels). PDF | In this paper we have simulated a flow sheet of aqua ammonia refrigeration system using Cape Open simulator. Direct cooling of fermentation tanks with ammonia offers significant advantages: The energy density of the evaporating ammonia is several times higher compared to coolants, such as glycol/ water mixtures. << /Length 5 0 R /Filter /FlateDecode >> Figure 1 : Horizontal Plate Freezer. Ammonia has a low boiling point (-28°F @ 0 psig), an ozone depletion potential (ODP) of 0.00 when released to atmosphere and a high latent heat of vaporization eight (8.17 at -28°F) times higher than R-12 and 5 During this presentation, we will discuss •Brief background on ammonia and its uses •Ammonia, the refrigerant •Ammonia refrigeration, the technology •How is ammonia different compared to other refrigerants? 2. Seminar On Absorption Refrigeration System PDF Report Download ABSTRACT. Date post: 02-Jul-2018: Category: Documents: View: 218 times: Download: 0 times: Download for free Report this document. y DCE REFRIGERATION PVT LTD. LOW CHARGE AMMONIA REFRIGERATION SYSTEM WITH HIGH SIDE FLOAT & NO RECEIVER- P&I DRAWING H.SIDE FLOAT No HP RECEIVER. Appendix 2 Check lists to secure the safety of an ammonia refrigeration system..... 40 . Feedback - Ammonia and refrigeration page 3 CONTENTS Glossary Introduction History p. 9 Current situation and perspectives p. 10 Ammonia refrigeration systems Cold production p. 13 • General p. 13 • Theoretical refrigeration cycle and flow diagram p. 14 • Actual refrigeration cycle p. 15 By using the ambient wet bulb design temperature (AWBDT) as the condensing and gas cooling base temperature instead of the ambient dry bulb temperature, all CO 2 refrigeration applications are brought within the scope of efficient applications worldwide. Acid is formed as a result of the breakdown of the refrigerant and oil. Low Ammonia Charge Refrigeration Systems for Cold Storage | October 2014 (Version 1) 7 : Objectives : The primary objective this paper is to provideof a fundamental and unbiased assessment of the technologies andrefrigeration system designs available to the industry leaders which can ultimately lead to a substantially reduced ammonia charge for their cold storagefacilities. Only authorised personnel have access to the set-up location. ‐ Ammonia/CO2 cascade refrigeration systems are at least as energy efficient as a traditional ammonia refrigeration system (Christensen 2006). –We would like to get a consultants perspective on the entire refrigeration system and design process. Transcript: DX AMMONIA PIPING HANDBOOK 4TH EDITION . The condenser condenses the ammonia vapour using a heat exchanger. 1462 0 obj <>/Filter/FlateDecode/ID[<1C84635D1D85CC499F6A04773BB0D393>]/Index[1455 15]/Info 1454 0 R/Length 55/Prev 991033/Root 1456 0 R/Size 1470/Type/XRef/W[1 2 1]>>stream An ammonia refrigeration system, like all vapor-compression refrigeration systems, are made up of a number of components that work together. These guidelines do not apply to ammonia absorption refrigeration systems. Ammonia refrigeration system: Strict regulations for machine rooms. endstream endobj 1456 0 obj <>/Metadata 120 0 R/Pages 1453 0 R/StructTreeRoot 180 0 R/Type/Catalog>> endobj 1457 0 obj <>/MediaBox[0 0 595.32 841.92]/Parent 1453 0 R/Resources<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 1458 0 obj <>stream ammonia refrigeration system using reciprocating compressors and pump circulation overfeed system was selected. Ammonia refrigeration works much like Industrial Refrigeration systems using synthetic refrigerants, with the major exception being that it uses anhydrous ammonia as the refrigerant. Acid is formed as a result of the breakdown of the refrigerant and oil. refrigerant. ammonia refrigeration system and the related refrigeration system components. 4 0 obj Water may enter the system as a result of installation, service, leakage, etc.. �^R�t+1P�2|�����;��X7�}�3�O�$� of a mechanically-pumped liquid overfed refrigerant loop, the refrigerant in the recirculating vessel. Refrigerant grade anhydrous ammonia is a clear, colorless gas or liquid and about 99.95% pure. ammonia refrigeration system and the related refrigeration system components. 1455 0 obj <> endobj Page 1 of … Industrial refrigeration systems predominantly use natural refrigerants, primarily ammonia and more recently CO2 Energy efficiency and the effective operation of those systems are the key parameters for operators of the plants The focus of the white paper is the comparisons of hot gas defrost strategy control methods, both on the hot gas side as well as on the condensate drain Appendix 2 Check lists to secure the safety of an ammonia refrigeration system..... 40 . Seminar On Absorption Refrigeration System PDF Report Download ABSTRACT. Calculation of materials flowrates given a product rate. This work presents an experimental study of an ammonia – water absorption refrigeration system using the exhaust of an internal combustion engine as energy source. By using industry best practices, … The Myth Regarding the Use of Ammonia in a DX Designed refrigeration system The desire to use the world’s most energy-efficient refrigerant, ammonia, in DX-designed refrigeration systems has led to many challenges and has rightfully earned the reputation of being a poor solution that does not always work well. Calculation of the thermal loads. refrigeration worldwide if ammonia design principles are followed. Sr No. Ammonia Refrigeration & Scenario in Industrial Refrigeration By Ramesh Paranjpey ASHRAE Fellow Life member 5th March 2014. maintain Ammonia refrigeration systems whether their particular skillset was installing residential air conditioning (Heat pumps) or commercial supermarkets, there is no demarcation. refrigerant. . The ground must be sealed, and the room must be gas-tight. Another safety concern is the corrosive effect … ammonia refrigeration system using reciprocating compressors and pump circulation overfeed system was selected. Share this document with a friend. NH 3 systems should therefore be purged with air or a non-flammable gas prior to starting the welding work in order to remove residual ammonia. an ammonia refrigeration system. If you as the Refrigeration Engineer had no criteria, constraints, direction, etc. See Table 2, Arena R-Bourque. V34� �� �`hh`�``�`�� �9@�A�!4�!�����-(�֐d� �)fh`� +g�h �� G�C����iPp���T8����y�}g�Neen ��f�;% �y\�@�X@U�rf`.#3@� k 4. In order to design the refrigeration system, we must accomplish: 1. The components like absorber, and generator perform the regular functions. DX AMMONIA PIPING HANDBOOK 4th EDITION . When ammonia leaves the generator in the vaporized state some particles of water vapor are also carried with it, and these are removed in the analyzer and the rectifier. See Table 2, Arena R-Bourque. 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Report Download ABSTRACT attainable through time DEFINITIONS CONVENTIONAL ammonia refrigeration system, like all vapor-compression systems! Original name, Workers ’ Compensation Board of British Columbia - Handbooks, manuals, etc to! Has a very low boiling point when liquid ( -27F ) ’ Compensation Board of British Columbia Handbooks... Refrigeration was first used in an ice-making machine in 1858 by French engineer, Carre! The physical state of the refrigerant, i.e … safety laws for anhydrous refrigeration... Consultants perspective on the entire refrigeration system PDF Mechanically pumped liquid overfeed ammonia. Pressure level of the refrigerant and oil physical state of the refrigerant in the ammonia-water absorption refrigeration system ammonia!

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