In a method for correlating vent tiles with racks, the vent tiles are opened to a first setting and the mass flow rates of air received by the racks and supplied through the vent tiles are determined. In addition, one of the vent tiles is closed to obtain a second setting and the mass flow rates of
In a method for correlating vent tiles with racks, the vent tiles are opened to a first setting and the mass flow rates of air received by the racks and supplied through the vent tiles are determined. In addition, one of the vent tiles is closed to obtain a second setting and the mass flow rates of air received by the racks and supplied through the vent tiles are determined at the second setting. The vent tiles and the racks are correlated based upon the determined mass flow rates of air received by the racks and the mass flow rates of air supplied through the vent tiles at the first and second settings.
대표청구항▼
What is claimed is: 1. A method for correlating vent tiles with racks, said method comprising: (a) setting the vent tiles to a first setting; (b) determining mass flow rates of air received by the racks; (c) determining mass flow rates of air supplied through the vent tiles; (d) closing one of the
What is claimed is: 1. A method for correlating vent tiles with racks, said method comprising: (a) setting the vent tiles to a first setting; (b) determining mass flow rates of air received by the racks; (c) determining mass flow rates of air supplied through the vent tiles; (d) closing one of the vent tiles to obtain a second setting; (e) repeating steps (b) and (c); and (f) correlating the vent tiles and the racks based upon the determined mass flow rates of air received by the racks and the mass flow rates of air supplied through the vent tiles at the first and second settings. 2. The method according to claim 1, further comprising: (g) opening the closed vent tile; (h) setting another vent tile to a third setting; and (i) repeating steps (b), (c) and (f), wherein step (f) comprises correlating the vent tiles and the racks based upon the determined mass flow rates of air received by the racks and the mass flow rates of air supplied through the vent tiles at the first, second and third settings. 3. The method according to claim 2, wherein the step of setting the vent tiles to a first setting comprises opening the vent tiles, wherein the step of setting another vent tile to a third setting comprises closing the another vent tile. 4. The method according to claim 1, wherein the vent tiles comprise fan assemblies, wherein the step of setting the vent tiles to a first setting comprises activating the fan assemblies such that the fan assemblies cause airflow out of the vent tiles, and wherein the step of closing one of the vent tiles comprises deactivating one of the fan assemblies. 5. The method according to claim 1, wherein the step of correlating the vent tiles and the racks further comprises solving the following matrix equation: [VTI]=[MR]��[MVT]-1, wherein VTI is a vent tile influence coefficient matrix, MR is the vector of mass flow rates of air delivered to each rack and MVT is the vector of mass flow rates of air through each vent tile. 6. The method according to claim 1, wherein the racks include inlets and outlets, said method further comprising: detecting temperatures at the inlets and outlets of the racks; detecting temperatures of the air supplied by the vent tiles; calculating an index of re-circulation based upon the detected temperatures; and factoring the calculated index of re-circulation in correlating the vent tiles and the racks. 7. The method according to claim 6, wherein the step of factoring the calculated index of re-circulation further comprises solving the following matrix equation: [MR]=[VTI]��[MVT]+[Γ], wherein VTI is a vent tile influence coefficient matrix, MR is a vector of mass flow rates of air delivered to each rack, MVT is a vector of mass flow rates of air through each vent tile, and Γ is a matrix of the re-circulation mass flow rate that infiltrates the inlets of the racks. 8. The method according to claim 1, wherein the racks include inlets, said method further comprising: detecting temperatures at the inlets of the racks; detecting temperatures of the air supplied by the vent tiles; and wherein the step of correlating the vent tiles and the racks comprises solving the following equation: [MRΔTR]A=[VTI]A�� [ΔMVTTVT], wherein [MRΔTR]A is a 1��N matrix and represents a product of the mass flow rate and inlet temperature change for a single rack (A), [VTI]A is a 1��N matrix and is a vent tile index coefficient for rack A, and [ΔMVTTTV]A is an N��M matrix and is a product of change in vent tile flow rates and temperatures of the airflow supplied by the vent tiles as the vent tile openings are varied sequentially N times. 9. The method according to claim 1, wherein the racks include inlets and outlets, said method further comprising: detecting temperatures at the inlets and outlets of the racks; detecting temperatures of the air supplied by the vent tiles; calculating an index of re-circulation based upon the detected temperatures; and wherein the step of correlating the vent tiles and the racks comprises solving the following equation: [MRΔTR]A=[VTI]A�� [ΔMVTTVT]+[ΔΓ]A, wherein [MRΔTR]A is a 1��N matrix and represents a product of the mass flow rate and inlet temperature change for a single rack (A), [VTI]A is a 1��N matrix and is a vent tile index coefficient for rack A, [ΔMVTTVT]A is an N��M matrix and is a product of change in vent tile flow rates and temperatures of the airflow supplied by the vent tiles as the vent tile openings are varied sequentially N times, and [ΔΓ]A is the 1��N re-circulation matrix for rack A. 10. The method according to claim 1, wherein the racks include inlets and outlets, said method further comprising: detecting temperatures at the inlets and outlets of the racks; detecting temperatures of the air supplied by the vent tiles; calculating an index of re-circulation (SHI) based upon the detected temperatures; and wherein the step of correlating the vent tiles and the racks comprises solving the following equation: wherein M denotes the mass flow rates of air, r denotes the racks, vt denotes the vent tiles, j denotes the jth rack, k denotes the kth vent tile, and m denotes the number of vent tiles, and wherein SHI is calculated through the following equation: wherein (Trin )i,j and (Trout)i,j are the respective inlet and outlet temperatures from the ith rack in the jth row of racks and Tref denotes the average temperature of the airflow supplied through the vent tiles. 11. The method according to claim 1, wherein the step of correlating the vent tiles and the racks further comprises calculating a vent tile influence coefficient (VTI) having values, said method further comprising: determining whether the values of the calculated VTI are near zero; reducing the vent tile openings by a predefined amount in response to the values of the calculated VTI being near zero; and repeating steps (b)-(f). 12. The method according to claim 1, wherein the step of correlating the vent tiles and the racks further comprises calculating a vent tile influence coefficient (VTI) having values, and wherein the airflow supplied through the vent tiles is supplied by a CRAC unit, said method further comprising: determining whether the values of the calculated VTI are near zero; reducing output of the CRAC unit by a predefined amount in response to the values of the calculated VTI being near zero; and repeating steps (b)-(f). 13. The method according to claim 1, wherein the racks house equipment, said method further comprising: determining total airflow requirements of the equipment housed in the racks; opening the vent tiles to a uniform level; determining mass flow rates of air supplied through the vent tiles; summing the mass flow rates of air supplied through the vent tiles; determining whether the summed mass flow rates of air supplied through the vent tiles falls within a predetermined percentage of the total airflow requirements of the equipment housed in the racks; and performing step (a) with the vent tiles set to the uniform level in response to the summed mass flow rates of air supplied through the vent tiles falling within the predetermined percentage of the total airflow requirements of the equipment housed in the racks. 14. The method according to claim 13, further comprising: increasing the vent tile openings by a predefined amount in response to the summed mass flow rates of air supplied through the vent tiles falling below or equaling the predetermined percentage of the total airflow requirements of the equipment housed in the racks; determining mass flow rates of air supplied through the vent tiles at the increased vent tile openings; summing the mass flow rates of air supplied through the vent tiles; determining whether the summed mass flow rates of air supplied through the vent tiles falls within a predetermined percentage of the total airflow requirements of the equipment housed in the racks; and performing step (a) with the vent tiles set at the increased openings in response to the summed mass flow rates of air supplied through the vent tiles falling within the predetermined percentage of the total airflow requirements of the equipment housed in the racks. 15. The method according to claim 13, further comprising: decreasing the vent tile openings by a predefined amount in response to the summed mass flow rates of air supplied through the vent tiles exceeding the predetermined percentage of the total airflow requirements of the equipment housed in the racks. determining mass flow rates of air supplied through the vent tiles at the decreased vent tile openings; summing the mass flow rates of air supplied through the vent tiles; determining whether the summed mass flow rates of air supplied through the vent tiles falls within a predetermined percentage of the total airflow requirements of the equipment housed in the racks; and performing step (a) with the vent tiles set at the decreased openings in response to the summed mass flow rates of air supplied through the vent tiles falling within the predetermined percentage of the total airflow requirements of the equipment housed in the racks. 16. The method according to claim 1, wherein the step of correlating the vent tiles and the racks further comprises approximating a correlation between at least one of the vent tiles and at least one of the racks based upon a distance between the at least one of the vent tiles and the at least one of the racks. 17. The method according to claim 1, further comprising: identifying vent tiles whose influence over the racks is below a predefined threshold; determining whether the number of identified vent tiles exceeds a predetermined threshold; and at least one of deactivating and replacing the identified vent tiles in response to the number of identified vent tiles falling below the predetermined threshold. 18. The method according to claim 1, further comprising: identifying vent tiles whose influence over the racks is below a predefined threshold; determining whether the number of identified vent tiles exceeds a predetermined threshold; and grouping the identified vent tiles into one or more groups according to their locations with respect to each other in response to the number of identified vent tiles falling below the predetermined threshold. 19. A computing device configured to evaluate relationships between vent tiles and racks, said computing device comprising: an input module implemented by a first programming code stored on a computer readable medium configured to receive communications from one or more sensing devices; a vent tile influence coefficient (VTI) calculation module implemented by a second programming code stored on the computer readable medium, wherein the VTI correlates a relationship between the mass flow rate of air supplied through the vent tiles and the mass flow rate of air delivered into the racks; and a controller configured to execute the first programming code and the second programming code. 20. The computing device according to claim 19, wherein the VTI calculation module is further configured to solve the following matrix equation: [VTI]=[MR]��[MVT]-1, wherein VTI is a vent tile influence coefficient matrix, MR is the vector of mass flow rates of air delivered to each rack and MVT is the vector of mass flow rates of air through each vent tile. 21. The computing device according to claim 19, wherein the VTI calculation module is further configured to solve the following equation: [MRΔTR]A=[VTI]A�� [ΔMVTTVT], wherein [MRΔTR]A is a 1��N matrix and represents a product of the mass flow rate and inlet temperature change for a single rack (A), [VTI]A is a 1��N matrix and is a vent tile index coefficient for rack A, and [ΔMVTTVT]A is an N��M matrix and is a product of change in vent tile flow rates and temperatures of the airflow supplied by the vent tiles as the vent tile openings are varied sequentially N times. 22. The computing device according to claim 19, further comprising: an index of re-circulation module implemented by a third programming code stored on a computer readable medium configured to calculate levels of re-circulation of heated airflow into cooled airflow delivered into the nicks from the vent tiles; and wherein the controller is configured to execute the third programming code. 23. The computing device according to claim 22, wherein the VTI calculation module is further configured to solve the following matrix equation: [MR]=[VTI]��[MVT]+[Γ], wherein VTI is a vent tile influence coefficient matrix, MR is a vector of mass flow rates of air delivered to each rack, MVT is a vector of mass flow rates of air through each vent tile, and Γ is a matrix of the re-circulation mass flow rate that infiltrates the inlets of the racks calculated by the index of re-circulation calculation module. 24. The computing device according to claim 22, wherein the VTI calculation module is further configured to solve the following equation: [MRΔTR]A=[VTI]A�� [ΔMVTTTV]+[ΔΓ]A, wherein [MRΔTR]A is a 1��N matrix and represents a product of the mass flow rate and inlet temperature change for a single rack (A), [VTI]A is a 1��N matrix and is a vent tile index coefficient for rack A, [ΔMVTTVT]A is an N��M matrix and is a product of change in vent tile flow rates and temperatures of the airflow supplied by the vent tiles as the vent tile openings are varied sequentially N times, and [ΔΓ]A is the 1��N re-circulation matrix for rack A calculated by the index of re-circulation calculation module. 25. The computing device according to claim 22, wherein the VTI calculation module is further configured to solve the following equation: wherein M denotes the mass flow rates of air, r denotes the racks, vt denotes the vent tiles, j denotes the jth rack, k denotes the kth vent tile, and m denotes the number of vent tiles, and wherein the index of re-circulation calculation module is configured to calculate SHI through the following equation: wherein (Trin)i,j and (Trout)i,j are the respective inlet and outlet temperatures from the ith rack in the jth row of racks and Tref denotes the average temperature of the airflow supplied through the vent tiles. 26. The computing device according to claim 19, wherein the controller configured to control one or more functions of the computing device, wherein said controller is configured to determine whether values of the calculated VTI are near zero, and wherein the controller is further configured vary at least one of vent tile openings and CRAC unit outputs based upon a determination that values of the calculated VTI are near zero. 27. The computing device according to claim 19, wherein the controller configured to control one or more functions of the computing device, wherein said controller is configured to determine a total airflow requirement of equipment housed in the racks, determine the mass flow rates of air supplied through the vent tiles, sum the mass flow rates of air supplied through the vent tiles, determine whether the summed mass flow rates of air supplied through the vent tiles falls within a predetermined percentage of the total airflow requirements of the equipment, and vary the vent tile openings by a predefined amount in response to the summed mass flow rates of air supplied through the vent tiles falling outside the predetermined percentage of the total airflow requirements of the equipment. 28. The computing device according to claim 19, wherein the controller configured to group vent tiles that have relatively little influence over the racks into one or more groups, and wherein the controller is configured to control each of the one or more groups of vent tiles as individual vent tiles. 29. A computer readable storage medium on which is embedded one or more computer programs, said one or more computer programs implementing a method of correlating vent tiles with racks, said one or more computer programs comprising a set of instructions for: determining mass flow rates of air received by the racks; determining mass flow rates of air supplied through the vent tiles; determining mass flow rates of air received by the racks with the one of the vent tiles closed; determining mass flow rates of air supplied by the vent tiles with the one of the vent tiles closed; and correlating the vent tiles and the racks based upon the determined mass flow rates of air received by the racks and the mass flow rates of air supplied through the vent tiles at a first iteration and a second iteration with the one of the vent tiles closed. 30. The computer readable storage medium according to claim 29, said one or more computer programs further comprising a set of instructions for: solving the following matrix equation: [VTI]=[MR]��[MVT]-1, wherein VTI is a vent tile influence coefficient matrix, MR is the vector of mass flow rates of air delivered to each rack and MVT is the vector of mass flow rates of air through each vent tile. 31. The computer readable storage medium according to claim 29, said one or more computer programs further comprising a set of instructions for: solving the following matrix equation: [MR]=[VTI]��[MVT]+[Γ], wherein VTI is a vent tile influence coefficient matrix, MR is a vector of mass flow rates of air delivered to each rack, MVT is a vector of mass flow rates of air through each vent tile, and Γ is a matrix of the re-circulation mass flow rate that infiltrates inlets of the racks.
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