DISTRIBUTOR SELECTION METHOD

Abstract

The invention relates specifically to a method for ensuring the correct selection of distributor systems that provide even distribution of a refrigerant to the DX coil.

Description

1 TARIFF DISTRIBUTOR SELECTION METHOD Technical Area The invention relates to a method for selecting a distributor system. Specifically, the invention relates to a refrigerant equivalent to a direct expansion (DX) serpentine of 5. Making the right choice in distributor systems that enable distribution It relates to a method that provides this. State of the Art Today, the distributor system is a cooling system's liquid piping connected to the DX (Direct-to-X) distribution system. It is a connecting piece between the expansion (spring) coils. Its purpose is to connect the coils in cooling systems. The goal is to distribute the refrigerants evenly throughout the DX coil. This even distribution ensures cooling. This ensures the process performs optimally. Therefore, the right distributor is essential. The selection of the system is critical to the functionality of the cooling systems. In cooling and air conditioning systems, to cool the air, remove moisture, or heat it. Direct expansion (DX) coils are used for this. 15 The refrigerant fluid passes through. In cooling mode, the refrigerant fluid changes from liquid to gas phase. It absorbs heat from the air while changing temperature, thus cooling the air and removing its moisture. In heating mode However, as the refrigerant condenses and changes from gas to liquid, it releases heat to the air, thus... It heats the air. For this function to be performed efficiently, the refrigerant must be DX. It needs to be distributed evenly throughout the serpentine. For this even distribution process, distributor 20 The system is necessary. It is used for the cooling system to operate efficiently. The correct distributor system must be selected. The distributor system is shown in Figure 1. As shown, it is a device consisting of two parts: the body and the nozzle. The body It is called a distributor. The refrigerant is distributed from the distributor to the DX coil. It has evenly distributed capillary holes. The nozzle is a cylindrical part with a hole in the middle. 25 The coolant coming from the liquid line in the cooling system passes through a narrow area. It is the part that directs the water through capillary pores for even distribution. Current techniques for distributor and nozzle selection are based on manufacturer manuals. It relies on manual processes. This usually involves multi-step tables and charts. It requires work and is a time-consuming process. In addition, the existing 30 2 The technique is complex due to the use of multi-step tables and graphs. This makes the selection process difficult. This makes the process more difficult for inexperienced users and increases the risk of human error. The tables used in current technology are prepared for specific cooling system variables. For example, it is prepared for refrigerants such as R410A and R407C. A different... When a selection is required regarding the refrigerant, the available tables provide selection number 5. This is not possible. The current technique does not allow selection for every system variable. It has the problem of individuals being able to read and evaluate tables. Approximate choices can be made depending on the situation. For example, a choice can be made based on an evaporation temperature of -7°C. when the desired evaporation rate is desired and this value is not directly available in the table The closest value to the temperature is taken, or interpolation is performed between the two values ​​in the table. 10 This is being done. This situation risks leading to less accurate and inconsistent choices. This shows that. Incorrect sizing of a distributor or nozzle can result in uneven distribution along the serpentine coil. sections that are over- or under-supplied, causing refrigerant flow problems This can result in oversizing the nozzle and distributor in a DX serpentine coil, leading to a low 15. due to refrigerant velocity, uneven distribution, decreased heat transfer efficiency, and This can cause damage by allowing liquid refrigerant to enter the compressor. Conversely, Inadequate sizing leads to excessive pressure drop, insufficient refrigerant flow, uneven distribution, reduced cooling capacity, potential damage to the coil. To compensate for icing and inefficiencies, the compressor workload is increased by 20%. This leads to an increase in energy consumption and operating costs. These problems... It not only reduces system performance but also shortens its lifespan. Distributor and nozzle information can be found on the websites of manufacturers such as Danfoss, Spinco, and SKM Sağlam. Approximate multi-step tables for selection can be found (see: Ref-1, Ref-2, Ref-3). In the examples given, only one manufacturer offers an automated selection technique. However, these 25 The method still relies on existing tables for product selection. As a result, fewer The problem of approximate results leading to inaccurate and inconsistent choices persists. In conclusion, due to the negative aspects described above and the current solutions being the subject of discussion... Due to its shortcomings, an improvement is needed in the relevant technical field. It has been made. 30 3 Purpose of the Invention The invention was created by drawing inspiration from existing situations and overcoming the aforementioned drawbacks. It aims to solve the problem. The main purpose of the invention is to provide a suitable distributor for DX (Direct Expansion) serpentine and The goal is to develop a method for nozzle selection. Automatic selection is "manual 5". It eliminates significant problems such as "calculation process" and "time consumption". Another purpose of the invention is to utilize multi-step tables and graphs in the existing technology. a method that eliminates complexity and therefore reduces human error to place. Another purpose of the invention is that it does not require the user to understand the background process. Considering this, the process is suitable even for those with limited design experience. The goal is to offer a method that is easy to use and can simplify things. This feature, Eliminating the problem of "inexperienced users having difficulty making choices" It removes. Another aim of the invention is to optimize the cooling system thanks to dynamic calculation logic. a method that allows selection for any value of its variables The goal is to create. In current technology, choices are made by the manufacturer. Based on the closest value to the system variables to be selected from the tables This is being done. Thanks to its dynamic computation capability, the developed algorithm is "approximately"... This eliminates the problem of "results". 20 Another purpose of the invention is to use refrigerants other than R410A and R407C. a method that also allows for a comprehensive selection of refrigerant types The goal is to create a refrigerant or system variable that is not present in the method. If a choice is requested, a database can be created to make the selection process easier. It can be brought. 25 To fulfill the purposes described above, the invention is DX (Direct Expansion). Dynamic calculation enables the selection of a suitable distributor and nozzle for the serpentine coil. This is the method. Accordingly, the method is:  including evaporation temperature and refrigerant type specified by the user Entering cooling system values, 30 4  Distributor and nozzle combinations, from a predefined list or a Selecting the first combination in the database,  Obtaining geometric information from distributor and nozzle databases,  Evaporation properties of the refrigerant entered by the user Calculation at temperature, 5  Pressure loss correlation models found in the literature for two-phase flow determining what is appropriate,  Pressure losses originating from the nozzle and distributor are reduced by the selected pressure. Calculation of loss in accordance with the correlation model,  The calculated pressure loss is compared with the recommended optimum value, and the difference is 10 taking the measurement and checking if it is closest to the optimal value,  if the calculated pressure drop differs from the optimum value “Distributor and nozzle combinations, from a predefined list or a Returning to the step of "pulling the first combination in the database",  If the calculated pressure drop is closest to the optimum value, 15 the existing distributor and nozzle combination can be added to the selection or previously If a choice has been made, that choice is with the current distributor and nozzle combination. changing,  The selected distributor and nozzle combination must be from a predefined list. or checking if it is the last combination in a database, 20  The selected distributor and nozzle combination must be from a predefined list. or it is determined that it is not the last combination in a database In this case, "distributor and nozzle combinations, a predefined return to the step "to retrieve as the first combination in a list or database" turning, 25  The selected distributor and nozzle combination must be from a predefined list. or identifying it as the last combination in a database In this case, the most recently recorded distributor and nozzle combination is recommended. It includes the steps involved in the process. The structural and characteristic features and all the advantages of the invention are given in the figures below. This becomes clearer thanks to the detailed explanation written with references to these figures. This will be understood as such, and therefore the evaluation will also take these forms and detailed explanations into account. This should be done taking that into consideration. Figures that will help understand the invention. Figure 1 shows an example of a distributor system. Figure 2 illustrates the current method for distributor and nozzle selection in relation to the subject of the invention. It provides a comparative view of the method. Figure 3 shows the diagram illustrating the steps in the nozzle and distributor selection process. 5 It provides. Explanation of Part References 1. Dynamic calculation method 2. User-provided information including evaporation temperature and refrigerant type (10) Entering cooling system values 3. Distributor and nozzle combinations must be from a predefined list or a selecting the first combination in the database 4. Obtaining geometric information from distributor and nozzle databases. 5. Evaporation properties of the refrigerant entered by the user. calculation at temperature 6. Pressure loss correlation models found in the literature for two-phase flow. determining what is appropriate 7. Pressure losses originating from the nozzle and distributor are calculated using the selected pressure. Calculation of loss according to the correlation model 25 8. Comparing the calculated pressure loss with the recommended optimum value and disclosing the difference. taking the measurement and checking if it is closest to the optimal value 9. If the calculated pressure drop differs from the optimum value, 30 “Distributor and nozzle combinations, from a predefined list or a Returning to the step "to retrieve as the first combination in the database" 6 10. If the calculated pressure drop is closest to the optimum value, the existing distributor and nozzle combination can be added to the selection or previously If a choice has been made, that choice is with the current distributor and nozzle combination. change 5 11. The selected distributor and nozzle combination must be from a predefined list. or checking if it is the last combination in a database 12. The selected distributor and nozzle combination must be from a predefined list of 10. or it is determined that it is not the last combination in a database In this case, "distributor and nozzle combinations, a predefined return to the step "to retrieve as the first combination in a list or database" return 13. The selected distributor and nozzle combination must be from a predefined list. or identifying it as the last combination in a database In this case, the most recently recorded distributor and nozzle combination is recommended. DS: Distributor system 20 KD: Capillary pores N: Nozzle G: Body References 25 Ref-1:https: / / skmsaglam.com / wp-content / uploads / 2023 / 09 / Refrigerant-Distributors- Catalog-SKM-SAGLAM-Refrigeration-Components.pdf Ref-2: https: / / spincometal.com / machined-products / Ref-3: https: / / www.tradmatik.pl / pdf / PDFF0A102.pdf 7 Detailed Description of the Invention In this detailed explanation, the preferred configurations of the method in question are described only. This is explained to facilitate a better understanding of the subject. The essence of the method described in the invention is to determine the pressure drop throughout the system. It involves a numerical simulation and iterative calculations. 5 The process involves user inputs such as refrigerant type, evaporation temperature, etc. It starts with taking measurements. Then, things like pipe diameter, length, and capillary hole inclination angle are considered. predefined distributor and nozzle in which geometric properties are obtained The process continues by obtaining a list of combinations. To be used in pressure drop calculations, the physical properties of the refrigerant are 10. The refrigerant must be calculated at the evaporation temperature entered by the user. Its properties include gas and liquid density and viscosity. These values ​​are then... the two-phase viscosity of the refrigerant (from two-phase mixture viscosity models) (calculated), two-phase density, flow dryness level, velocity, mass flow, It is used to determine the Reynolds number, friction factor, and void ratio. 15 These values ​​are necessary for two-phase flow calculations. The hydraulic diameter of the capillary hole, the type of coolant, the Reynolds number, and two other factors Among the different calculation methods for pressure loss depending on phase characteristics The appropriate one is selected. Many pressure-loss correlations for two-phase flows exist in the literature. These correlations have been suggested. Some of these correlations are from “Tran et al.”, “Chen et al.” and “Yan and Lin” and 20 others. The most up-to-date correlations in the literature are embedded in the algorithm. Which The algorithm automatically determines which correlation to use. After calculating the distributor and nozzle pressure drops separately, the total pressure drop is calculated. The total pressure loss is found by adding up the components. The system checks whether the calculated pressure drop is closest to the optimum value. It enters a cycle to determine the optimum value of the calculated pressure drop. They are compared. The optimum value varies depending on the refrigerant. This value Based on observations obtained through literature review and experimental study It has been determined. The initial distributor and nozzle combination is added directly to the selection. Subsequent... The difference between the optimal value and the selection for distributor and nozzle combinations is 30. If it is less than what is available, the selection is changed and the current distributor and nozzle combination is selected. 8 It is added to the selection. If the current value is the closest value to the combination in the selection... Otherwise, the process moves to the next step where the nozzle and distributor combination is evaluated. rotary. The process then determines whether it is the last distributor and nozzle combination on the list. It checks. If the final combination cannot be reached, the process continues to the next nozzle and distributor 5. It returns to the step where the combination is evaluated, and when the final combination is reached, The method suggests the most recently recorded distributor and nozzle combination, process This is completed and the closest desired pressure drop is achieved. In this context, as shown in Figure 3. The following steps are performed in order:  10 including evaporation temperature and refrigerant type specified by the user Entering cooling system values ​​(2),  Distributor and nozzle combinations, from a predefined list or a Selection of the first combination in the database (3),  Obtaining geometric information from distributor and nozzle database (4),  Evaporation properties of the refrigerant entered by the user 15 Calculation at temperature (5),  Pressure loss correlation models found in the literature for two-phase flow Determining the appropriate one (6),  Pressure losses originating from the nozzle and distributor are reduced by the selected pressure. Calculation of loss in accordance with the correlation model (7), 20  Comparing the calculated pressure loss with the recommended optimum value and the difference taking and checking whether it is closest to the optimal value (8),  if the calculated pressure drop differs from the optimum value “Distributor and nozzle combinations, from a predefined list or a Returning to step (3)” which is retrieved as the first combination in the database 25 (9),  if the calculated pressure drop is closest to the optimum value, the existing distributor and nozzle combination can be added to the selection or previously If a choice has been made, that choice is with the current distributor and nozzle combination. change (10), 30  The selected distributor and nozzle combination must be from a predefined list. or checking if it is the last combination in a database (11), 9  The selected distributor and nozzle combination must be from a predefined list. or it is determined that it is not the last combination in a database In this case, "distributor and nozzle combinations, a predefined Return to step (3)” to retrieve as the first combination in a list or database turning (12), 5  The selected distributor and nozzle combination must be from a predefined list. or identifying it as the last combination in a database In this case, the most recently recorded distributor and nozzle combination is recommended. (13). Instead of obtaining approximate values ​​from tables, the method described in the invention uses dynamic methods. It enables more accurate and precise selections by using calculation methods. Taking into account more details such as the distributor's geometric parameters, enriching the design process, the density of the coolant at the desired temperature and Dynamic calculation of physical properties such as viscosity improves process accuracy by 15. It increases. In models used to calculate pressure drop in two-phase flows, gas and Parameters such as fluid velocity and flow regime are analyzed in detail to create a more realistic result. Results are obtained. Among the correlations found in the literature, the most suitable model is selected. Choosing this supports the accuracy and reliability of the calculations. Additionally, the flow... properties such as Re number, dryness level or void ratio, 20 Taking pressure loss into account in calculations increases the accuracy of the results. Dynamic evaluation of distributor and nozzle geometric parameters, This allows for the analysis of different combinations. This flexibility affects the design process. This provides a significant advantage. Furthermore, the angle of the capillary holes in the distributor reduces pressure loss. Inclusion in calculations, quick and easy integration into various designs 25 It offers the possibility of achieving the optimum by calculating the total pressure drop. Comparison of values, all distributor and nozzle combinations in the database. This approach ensures that the most suitable choice is made from among them. This approach simplifies the design process. It makes it both more efficient and more effective.

Claims

REQUESTS 1. Selecting a suitable distributor and nozzle for DX (Direct Expansion) coils. The dynamic calculation method (1) that provides the feature is;  including evaporation temperature and refrigerant type specified by the user Entering cooling system values ​​(2), 5  Distributor and nozzle combinations, from a predefined list or a Selection of the first combination in the database (3),  Obtaining geometric information from distributor and nozzle database (4),  Evaporation properties of the refrigerant entered by the user Calculation at temperature (5), 10  Pressure loss correlation models found in the literature for two-phase flow Determining the appropriate one (6),  Pressure losses originating from the nozzle and distributor are reduced by the selected pressure. Calculation of loss in accordance with the correlation model (7),  The difference between the calculated pressure loss and the recommended optimum value is 15 taking and checking whether it is closest to the optimal value (8),  if the calculated pressure drop differs from the optimum value “Distributor and nozzle combinations, from a predefined list or a Returning to step (3)” to retrieve the first combination in the database (9), 20  if the calculated pressure drop is closest to the optimum value, the existing distributor and nozzle combination can be added to the selection or previously If a choice has been made, that choice is with the current distributor and nozzle combination. change (10),  The selected distributor and nozzle combination must be from a predefined list 25 or checking if it is the last combination in a database (11),  The selected distributor and nozzle combination must be from a predefined list. or it is determined that it is not the last combination in a database In this case, “distributor and nozzle combinations, a predefined 30 Return to step (3)” to retrieve as the first combination in a list or database turning (12),  The selected distributor and nozzle combination must be from a predefined list. or identifying it as the last combination in a database 11 In this case, the most recently recorded distributor and nozzle combination is recommended. (13) It includes the steps involved in the process.

2. This method complies with Claim-1 and its characteristic is; capillary 5 from distributor and nozzle database. The process step involves obtaining information on hole diameter, nozzle hole diameter, and tilt angle. It includes.

3. This method complies with Claim-1 and its characteristics include viscosity, density, flow quality, and velocity. Two-phase 10 such as mass flux, Reynolds number, friction factor and gap friction Calculation process at evaporation temperature entered by the properties It includes the step.

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