Centrifugal Chiller Fundamentals Energy Models. NOTICEThe information contained within this document represents the opinions and suggestions of Mc. Quay International. Equipment and the application of the equipment and system suggestions are offered by Mc. Quay International as suggestions only, and Mc. Quay International does not assume responsibility for the performance of any system as a result of these suggestions. The system engineer is responsible for system design and performance. Mc. Thank you for this wonderful Video. We also offering you best training courses with different places like Nashik, mumbai, thane, Jalgoan, Aurangabad. AStar Training Consultancy provides training and qualification services for the NDT NDE industry in the Asian region. AStar provides courses in Phased Array UT. Smc Indonesia supply electrostatic eliminator, thermo chiller, refrigerated air dryer ionizer for various industry in indonesia. Quay is a registered trademark of Mc. Quay International1. Mc. Quay InternationalIllustrations, information, and data cover Mc. Our building automation solutions for HVAC allows to design and build smarter AHU and chiller control solutions. DESCRIPTION This course will familiarize owner maintenance supervisors and technicians with Trane CenTraVac CVHEFGLM and the new CVHS oilless centrifugal. Skin Care Products For Teenage Acne Anti Aging Food Pyramid Skin Care Products For Teenage Acne Natural Skin Care Courses Products To Remove Skin Tags At Home. Quay International products at the time of publication and we reserve the right to make changes in design and construction at anytime without noticeIntroduction. There are over 8. North America. They are usually the most economical means to cool large buildings. Most design engineers will sooner or later use centrifugal chillers to meet their design needs. A general understanding of their design and operating characteristics will assist in applying the product properly and avoiding major pitfalls. The purpose of this manual is to provide design engineers with a basic knowledge of how centrifugal chillers operate so that they will better understand the interdependency of the chiller and the chilled water plant. Basic Refrigeration Cycle. A centrifugal chiller utilizes the vapor compression cycle to chill water and reject the heat collected from the chilled water plus the heat from the compressor to a second water loop cooled by a cooling tower. Figure 1 shows the basic centrifugal refrigeration circuit. It consists of the following four main components Figure 1, Basic Refrigeration Cycle. Evaporator. The evaporator is a heat exchanger that removes the building heat from the chilled water lowering the water temperature in the process. The heat is used to boil the refrigerant changing it from a liquid to a gas. Mc. Quay Distinction chillers use a flooded type evaporator, which is very energy efficient. Flooded evaporators have the chilled water in the tubes and the refrigerant in the shell. Large chillers can have over five miles of tubing in their heat exchangers. Compressor. The compressor assembly is made up of a prime mover and a centrifugal compressor. Mc. Quay Distinction series chillers use liquid refrigerant cooled hermetic electric motors an industry first. The centrifugal compressor is a non positive displacement type. It raises the pressure and temperature of the refrigerant by converting kinetic energy into pressure. Condenser. Like the evaporator, the condenser is a heat exchanger. Cs3 Keygen Activation more. In this case, it removes heat from the refrigerant causing it to condense from a gas to a liquid. The heat raises the water temperature. The condenser water then carries the heat to the cooling tower where the heat is rejected to atmosphere. Expansion Device. After the refrigerant condenses to a liquid, it passes through a pressure reducing device. This can be as simple as an orifice plate or as complicated as a electronic modulating thermal expansion valve. Mc. Quay Distinction series chillers use a Thermal Expansion Valve to give excellent modulation with a wide range of capacity and temperature conditions. Pressure Enthalpy Diagram. The Pressure Enthalpy P H diagram is another way of looking at the refrigeration cycle. For ICP analysis, SPECTRO GENESIS is the first and only ICPOES also ICPAES or ICP plasma spectrometer available with a complete set of factory methods. It has the advantage of graphically showing the process, the cooling effect and the work required to make it happen. Figure 2, Refrigeration Circuit, P H Diagram. The line from 2 to 3 represents the compression process. The work is the change in enthalpy from point 2 to point 3 times the flow of refrigerant. Simply, BTUlb. times the lb. Compressors end up with the work of compression as heat in the refrigerant. Open drive motors reject their winding heat in to the mechanical room. Since chiller motors are typically over 9. The vertical aspect of the curve shows the rise in refrigerant pressure and temperature from 2 to 3. The next process takes place in the condenser. The first section outside the refrigerant dome is the desuperheating process. Once the refrigerant is saturated, condensation occurs and the refrigerant changes from a gas to a liquid. Like the evaporator, the line is horizontal indicating constant pressure or temperature. Notice the liquid subcooling portion of the condenser to the left of the dome. It is easy to see on the P H diagram, how subcooling improves the total cooling effect. It lengthens the refrigerant effect per pound of refrigerant a larger H so that more cooling is done without an increase in power input. The Final process is the expansion device. This shows as vertical line from point 4 to point 1, indicating the pressure and temperature drop that occurs as the refrigerant passes through the TX valve. Typical Operating Conditions. The design conditions imposed by most water cooled HVAC systems work very well for centrifugal chillers. The Air Conditioning and Refrigeration Institute ARI provides test standards and certification for a wide range of HVAC products including centrifugal chillers. The ARI standard 5. Additionally, chillers typically have a certification that provides engineers and owners with a third party validation that the chiller will meet the performance the manufacturer indicates. The ARI test criteria allows an apples to apples comparison of different chillers. The standard ARI rating condition is Leaving chilled water temperature 4. FChilled water flow rate 2. Entering condenser water temperature 8. FCondenser water flow rate 3. The temperature change in the fluid for either the condenser or the evaporator can be described using the following formula Q W C TF     1Where. Q Quantity of heat exchanged btuhr or kwW flow rate of fluid USgpm or lsC specific heat of fluid btulbo. F or k. Jkgo. CTF temperature change of fluid o. F oro. CAssuming the fluid is water, the formula takes the more common form of Load btuhr FlowUSgpm o. Fin o. Fout 5. Or. Load tons FlowUSgpm o. Fin o. Fout 2. Using this equation and the ARI design conditions, the temperature change in the evaporator is found to be 1. F. The water temperature entering the evaporator is then 5. F. Recall that the heat that needs to be removed from the condenser is equal to the heat collected in the evaporator plus the work of compression. Assuming the work of compression is 2. Using the above equation and the ARI design conditions, the temperature change in the condenser for modern high efficiency chillers is found to be 9. F at 3 gpmton. The water temperature leaving the evaporator is then 9. F. This is often incorrectly rounded off to a 1. T and a 9. 5. 0o. F leaving water temperature. The ARI design conditions are frequently used as design conditions. Although they represent good average conditions to use, they may not represent the best design conditions to use for every project. Figure 3, Heat Exchanger Performance. Figure 3 shows the heat transfer process for both the condenser and the evaporator. Using the ARI design conditions, typical temperatures are shown. Looking at the condenser, the refrigerant temperature remains constant at 9. F. The refrigerant is changing from a gas to a liquid and is releasing its latent heat of condensation. At the same time the tower water enters the condenser at 8. F and is gaining sensible heat as its temperature rises to approximately 9.