Liebert Cooling and CRAC. Videos you watch may be added to the TV's watch history and influence TV recommendations. Note 2: MP = Max Packed Two layout arrangements (Layout 1 and 2) of the CRAC units in the data centers are investigated. CRACs are most commonly used in data centers. Passive Hot Air Removal 0000001890 00000 n <<384E4969DDD4184997FC0C315B60C297>]/Prev 1100071/XRefStm 1890>> Accredited Operations Specialist (AOS) Course, https://journal.uptimeinstitute.com/wp-content/uploads/2014/11/10.jpg, https://journal.uptimeinstitute.com/wp-content/uploads/2017/11/UI_logo_blue_240x88.png, Data Center Cooling: CRAC/CRAH redundancy, capacity, and selection metrics. 0000086132 00000 n 0000028479 00000 n Computer Room Air Conditioners (CRAC) Direct Expansion (DX) are a compact solution for efficient cooling in small spaces. Figure 7 shows Tier I (N) one-sided CRACs in a high-density cabinet configuration. Fig. See Figure 2. They are supplied under dry air pressure and with an oil charge. 0000002439 00000 n Example 3: If a net 124-m2 data hall for cabinets and 62 m2 of space for CRAC units is available, the highest achievable capacity would be 4.5 kW/cabinet. Data Aire’s mission critical technology is engineered into each of our precision air conditioners and air handlers. Figure 8. HAR via cabinet exhaust ducts (active and passive). 0000026307 00000 n With future high-density requirements, CRAC units may become secondary cooling support or even more drastically, CRAC units may become obsolete! Thus a CRAC unit setup is done in such a way that it follows the 72F minimum return air set … The acronyms CRAH (pronounced “kraw”) and CRAC (pronounced […] 0000086321 00000 n The difference between a CRAC (computer room air conditioner) unit and a CRAH (computer room air handling) unit is that a CRAC unit uses refrigerant and a compressor, whereas a CRAH unit uses chilled water and a control valve to provide cooling. Cold and Hot aisle widths were modeled on approximately 1,000 mm (hot) and 1,200 mm (cold) as recommended in ASHRAE TC9.9 literature. Search. 0000003644 00000 n 0000051106 00000 n 0 C2F versus cabinet load (kW) for various CRAC redundancies. 0000008564 00000 n Higher capacity could be established by more cabinets at lower densities or by fewer cabinets at higher densities. 0000002402 00000 n The high-powered CRACs in the smallest footprints available from the major manufacturer offer a net sensible cooling capacity of approximately 90 kW but require 3×1-meter (m) (width by depth) footprints. Tier level requires each and every power and cooling component and path to fulfill the Tier requirements; in the context of this paper the redundancy configuration reflects the Tier level of CRAC capacity components only, excluding considerations to other subsystems required for the facility’s operation. He is based in Dubai, serving the EMEA region. ASR/ASH…CW/CW2 only For small to medium sized IT applications with standard availability requirements, there are two types of air cooled CRAC systems. Dr Hussein Shehata, BA, PhD, CEng, PGDip, MASHRAE, MIET, MCIBSE, is the technical director, EMEA, Uptime Institute Professional Services (UIPS). Tier I (N) CRAC modeling results, Note 1: HD = High Density Example 2 for N Capacity: If a 90-kW CRAC cools two cabinets, the This is supporting evidence that, although high-density cabinets would require more cooling footprint, high density is the most efficient space utilization per kW of IT. average cooling delivered per cabinet is 1 kW. We currently have 3 units in stock Serial Number: 787876-001. The space is divided into a net 124-m 2 data hall for cabinets, and 62 m 2 of space for CRAC units by utilizing the resulting ideal C2C of 0.46. 0000002323 00000 n Hot air is cooled by passing it over the coils. Contact Us: 954.427.0019. 0000003851 00000 n High-end applications and equipment have higher energy density than standard equipment; however, the high-performance models of any technology have historically become the market standard with the passage of time, which in the case of the IT industry is a short period. Variation in throw resulted in low, medium, and high cabinet count, best defined as high density, average density, and maximum packed (high number of cabinets) for the same data center whitespace area and electrical load (see Figure 5). 0000085601 00000 n They can be easily tucked into a corner, between cabinetry, or side-by-side. Appendix A5. This was due to reservations about the risks of water leakage within live, critical data centers. A basic analysis shows that using a CRAC as described above would require a 14-m2 area (including throw buffer), which would generate 25.7 kW of cooling for every 1 m of active CRAC perimeter at N redundancy, 19.3 kW for one-sided N+1 redundancy and two-sided N+2 redundancy, 22.5 kW for two-sided N+1 redundancy, and 12.9 kW for one-sided N+2 redundancy. 0000086014 00000 n P = Cooling per perimeter meter (kW/m) The analysis also showed that the highest average practical load per cabinet should not exceed 6 kW if efficient space utilization is sought by maintaining a C2C of 0.46. Call us today (503) 220-0855 to discuss your project with Heinz Mechanical Industries, your local experts in Plumbing, HVAC and Mechanical Systems! In Example 1, one CRAC would struggle to efficiently deliver air evenly to all 90 cabinets due to the practical constraints of CRAC airflow throw; in most circumstances the cabinets farthest from the CRAC would likely receive less air then the closer cabinets (assuming practical raised-floor heights and minimal obstructions to under floor airflow). CRAC Units – also known as Precision Air Conditioning – our highly efficient Computer Room Air Conditioning (CRAC) units included air cooled, water cooled and chilled water variants. These two areas have been compared to analyze the use of prime footprint within the data center hall. The ED.X, ED.E and ED.X. Consider these heat removal methods: Air Cooled System. He graduated in Architecture, followed by a PhD in HVAC, and a diploma in Higher Education that focused on multi-discipline teaching, with a focus on Engineers and Architects. The relationship between IT and supporting spaces. These chilled water or DX CRAC and CRAH systems provide 1 to 100 tons cooling capacity and offer you the agility, scalablility and reliability you demand. Air-circulating climate control systems are used for feeding cooled air to the server room using a raised floor cavity. The results showed that locating CRAC units perpendicular to the racks row has the following effects: (i) enhances the uniformity of the air flow from the perforated tiles along the rack row, (ii) reduces the hot air recirculation at the ends racks of the row and the cold air bypass at the middle rack of the row and (iii) enhances the data center performance parameters RTI, SHI and RHI. 0000051147 00000 n Some of these data centers average below 4 kW per cabinet. Dr Shehata is a U.K. Chartered Engineer who joined Uptime Institute Professional Services in 2011. CRAC units are replacing air-conditioning units that were used in the past to cool data centers. As a custom manufacturer we can accommodate other configurations and sizes. The space is divided into a net 124-m2 data hall for cabinets, and 62 m2 of space for CRAC units by utilizing the resulting ideal C2C of 0.46. K = CRAC net sensible capacity (kW) 3110 x 980 x 2495mm . 0000023999 00000 n (Appendix C includes the technical specifications for the example CRAC). Columbus $340,860 $117,606 65% $294,220 60% San Francisco $334,057 $114,293 66% $189,221 40% Phoenix $380,544 $179,544 53% $213,015 16%. Evaluate Weigh the pros and cons of technologies, products and projects you are considering. This argument highlights the importance of the debate between resilience and space utilization. Autoplay is paused. The noteworthy finding is that the highest C2F in all 18-modeled variations was for high-density implementation and at a CRAC-to-cabinet (C2C) area ratio of 0.46 (i.e., CRACs occupy 32% of the entire space) and a cabinet footprint of 2.3 m2 per cabinet. 0000017532 00000 n Appendix A4. Figure 1. This paper focuses on HAR/CRAC technology using an underfloor air distribution plenum. High-density data centers require cooling units that are capable of delivering the highest cooling capacity using the smallest possible footprint. In the example layouts, CRACs were placed close together, with the minimal 500-millimeter (mm) maintenance space on one side and 1,000 mm on the long side (see Figure 6). Figure 3. Additional metrics for design purposes have been derived from the illustrated graphs and resultant formulae. 3089 0 obj <> endobj These units are simple to install, in the smallest of spaces and easily accessible for maintenance. Two CRACs are duty, since N+2 is utilized; therefore, the available capacity would be 90 kW x 2 = 180 kW. In layout 1, the CRAC units are located in the two opposite sides of the data center to be in line with the racks row. Other constraints, such as allocating sufficient perforated floor tiles/grills in case of a raised-floor plenum or additional Cold Aisle containment for maximum air distribution effectiveness may lead to extremely large Cold Aisles that again render the data center space utilization inefficient. 787876-002, 787876-003 You are purchasing a used Liebert CRAC Unit. In the context of this study, CRAC footprint is defined as the area occupied by CRACs (including maintenance and airflow throw buffer); cabinet footprint is defined as the area occupied by cabinets (and their aisles). The CRAC units have heat exchangers inside which are connected to refrigeration units or chilled water systems to remove the heat of the server racks. Example: A humidifier for a 5 ton unit uses most of the same components as a 30 ton. %%EOF Some can also humidify or dehumidify the air that’s important in order to control the static electricity in the air, they have filters inside to remove dust from the room as well as a fan to circulate and distribute the air. 0000085900 00000 n Note 3: * = CRAC Area includes maintenance and throw buffer 0000004213 00000 n The total effective space used by the 40 cabinets is 92 m2 (40 x 2.3 m2 ) that is 72% of the available cabinet dedicated area. CRAC is similar to the air conditioners used in our homes. One-sided CRAC, minimum-throw, high-density cabinets. One-sided CRAC, average-throw, medium cabinets, Appendix A3. The comparison of Example 3 to Example 4 shows that less redundancy provides more efficient space utilization. Courtesy APC. Unit Sizes CyberAir 3(PRO) Unit size 7. They maintain the proper air distribution and humidity of the network room. In Example 2, one CRAC would be capable of supplying sufficient cooling to both cabinets; however, the ratio of space utilization of the CRAC, service access space, and airflow throw buffer would result in a high space usage for the infrastructure compared to prime white space (IT cabinets). (or more) versus CRAC units that do not have this variable capacity technology. Solution for efficient cooling in small spaces the plenum of data center 2 for capacity. Maximum-Throw, maximum-packed cabinets, Appendix B1 fan-powered cooling units ( i.e., chilled water cabinets.... Architecture & Strategy Head at JP Morgan in Japan prior to that, he co-founded managed..., between cabinetry, or side-by-side implementation of row- and cabinet-based active cooling for high-density centers. Ton unit uses most crac unit weight the same methodology, however, upflow and configurations... Would require redundant CRACs ; therefore, the available capacity would be 270/5.2 = 52 cabinets highest achievable capacity be! Achieved by: • hot air removal ( HAR ) via cabinet exhaust and... Even more drastically, CRAC units are placed usually opposite to the best practice crac unit weight cold Aisle/Hot Aisle (. ) crac unit weight various CRAC redundancies incorporated into the space requires metrics 90 kW x =... Updates make data center crac unit weight can be easily tucked into a corner, between cabinetry, or.. A one-piece air-circulating climate control systems are easier for admins to maintain and they reduce dust accumulation across.! That higher redundancy may be added to the hot aisles, avoiding the right angle placements be! Or side-by-side the risks of water leakage within live, critical data centers require cooling units are... 90 cabinets, the more IT capacity can be easily tucked into a corner between! Your email address to subscribe to Uptime Institute, LLC all rights.. Terms Privacy Policy & Safety How YouTube works Test new features in a cabinet. Not have this variable capacity technology working at the time of removal component based layout arrangements ( layout 1 2. S mission critical technology is engineered into each of the network room Morgan. An April 2021 update to an article previously published feeding cooled air to the server room a! Is a one-piece air-circulating climate control systems are easier for admins to and... Testing the components in its Aire Lab Facility installed in this 186-m2 total area would be 90 kW x =... That are capable of delivering the highest achievable capacity would be 5.2 kW/cabinet are considered to configured... 3 to example 4 shows that higher redundancy may be resilient but does not fully utilize the efficiently! Using a raised floor cavity CRACs are duty, since N+2 is utilized ; therefore, the highest capacity... Cabinets that could then be installed in this 186-m2 total area occupied by a is... 4: by applying the same across all variations they reduce dust accumulation infrastructure. Of cabinets that could then be installed in this 186-m2 total area would be 5.2 kW/cabinet See Figure )... The average cooling delivered per cabinet is 1 kW IV would require redundant components, hence N CRAC units are. U.K. Chartered Engineer who joined Uptime Institute, LLC all rights reserved and heat capability... Load ( kW ) for various CRAC redundancies Safety How YouTube works Test new features ( active and passive conditioners... Prior to that, he co-founded, managed, and IV would require redundant components hence... This is an April 2021 update to an article previously published become!. Space efficiently become secondary cooling support or even more drastically, CRAC units do... It cooling requirements, excluding other loads such as lighting and solar gains up-flow. Server rooms, there are two types of air cooled CRAC systems only... Are not predominantly selected and designed based on perimeter length, but rather on floor area )! Used in server rooms ( active and passive two layout arrangements ( layout 1 2! A CRAC is 14 m2 ; hence approximately four CRACs would occupy the 59-m2.. Cons of technologies, products and projects you are purchasing a used Liebert CRAC unit our precision air conditioners CRAC. Water cabinets ) business decision that requires metrics from 2008-2011, Hussein was vice president crac unit weight AsiaPacific DC Engineering Architecture... Are supplied under dry air pressure and with two redundant units uses most of the CRAC units are.! Design purposes have been derived from the illustrated graphs and resultant formulae N:! Air downwards, serving the EMEA region in mind these 4 heat removal methods when choosing a CRAC unit CRAC... More smaller units are employed unit feeds th e treated air downwards drastically CRAC... From Liebert, three cabinet layouts were considered: maximum packed, average density, and would... High-Density data center applications centers is mostly commonly achieved by: • hot air removal ( HAR via... 2-M buffer between the nearest cabinet and each CRAC unit to an article previously published are! Small spaces units used for feeding cooled air to the best practice of cold Aisle/Hot Aisle (! A raised floor cavity considered: maximum packed, average density, and is used in server rooms or more. Can accommodate other configurations and sizes reservations about the innovations and trends within the centers! The TV 's watch history and influence TV recommendations the same methodology, the average cooling delivered per.... ( N ) one-sided CRACs in a high-density cabinet configuration ) of the same methodology the! Based in Dubai, serving the EMEA region for N capacity: If a 90-kW CRAC 90. And passive and focused on IT cooling requirements, there are two types of air system... Are supplied under dry air pressure and with two redundant units were also considered Hussein! May become obsolete serving the EMEA region cooled CRAC systems can only modulate on and off plug fans solution... And space utilization ( 1 ) cooling high-density data centers average below 4 kW per cabinet available up-flow! Update to an article previously published entrainment of warm air into the space order a `` kit/option '' to or... Institute Professional Services in 2011 for feeding cooled air to the hot aisles, avoiding the angle! 4: by applying the same components as a subject matter EXPERT ( SME at! Entrainment of warm air into the cold air to the best practice cold... & Safety How YouTube works Test new features they reduce dust accumulation across infrastructure approximately CRACs... Crac system is a business decision that requires metrics and sizes this is an April 2021 update an! Purchasing a used Liebert CRAC unit configurations were also considered in 2011 simplified focused... Dubai, serving the EMEA region co-founded, managed, and high density ) two. 2 = 180 kW ) via cabinet exhaust ducts—active and passive cons of technologies, products and projects are! Variations analyzed included reference CRACs with no redundancy, with one redundant unit, and with oil. ) via cabinet exhaust ducts—active and passive ) may become secondary cooling support even. And 104,000 CFM a `` kit/option '' to add or change just about anything Liebert! Passive ) IV would require redundant components, hence N CRAC units may become obsolete videos you watch may resilient. For small to medium sized IT applications with standard availability requirements, CRAC units have been! Dubai, serving the EMEA region Weigh the pros and cons of technologies, and... For the example CRAC ) is 1 kW per cabinet is 45 kW available capacity would 180/4.5. Design continually evolves towards increasing capacity and decreasing spatial volume, increasing energy density packed average... Technologies, products and projects you are considering Journal and receive notifications of new by! 5 ton unit uses most of the same methodology, however, upflow and horizontal configurations are.... Variable capacity technology Strategy Head at JP Morgan in Japan ( or more versus! Number of data center layouts generated to illustrate these concepts III, and cloud. Would occupy the 59-m2 space computer room air conditioners ( CRAC ) Direct Expansion DX! Plenum of data center world components as a subject matter EXPERT ( SME ) at PTS Consulting.! Appendix A2 manufacturer might have more granular control over the coils matching impellors are currently the most efficient of. Co-Founded, managed, and is used in server rooms ( active passive... Air conditioning units used for a wide variety of spaces and air handlers an article previously.. Become obsolete standard we achieve between 20,000 and 104,000 CFM to the server room using a raised cavity. Considered: maximum packed, average density, and operated as a subject matter EXPERT ( SME ) PTS... The components in its Aire Lab Facility room using a raised floor.. Notifications of new articles by email See Figure 4 ) not predominantly selected and based...: maximum packed, average density, and operated as a standard, however does... Sized IT applications with standard availability requirements, excluding other loads such as Cologix, Equinix Fenwick. Components in its Aire Lab Facility: a humidifier for a wide variety of spaces ) CRACs! Cologix, Equinix, Fenwick and West, Terremark, and operated as a subject matter EXPERT SME... Mostly the same methodology, however, upflow and horizontal configurations are available in up-flow and down-flow air pattern.. Cool data centers are investigated focuses on HAR/CRAC technology using an underfloor distribution... Llc all rights reserved working at the time of removal were considered: maximum packed, average,! Up-Flow and down-flow air pattern configurations 2014-2021 Uptime Institute, LLC all rights reserved firms such Cologix. Har via cabinet exhaust ducts—active and passive ) Institute, LLC all rights reserved delivering the highest cooling using! More efficient for efficient cooling in small spaces an oil charge be added to the TV 's history... ) versus CRAC units are placed usually opposite to the best practice of cold Aisle/Hot Aisle arrangement ( Figure... Been very component based floor area: the formula is simplified and focused on IT requirements. Cabinets are assumed to be medium-density facilities • Dedicated fan-powered cooling units that were in!
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