SPECIFIER’S GUIDE

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Selecting A Cooling Solution Sealed EncloSURE Cooling oVERVIEW 1 Determine Heat Exchanger Capacity Air-to-air heat exchanger capacities are not provided in terms of Watts or BTUs/hr. of cooling like air conditioners. Instead, they are expressed in terms of Watts/°F or Watts/°C. Thus, the final step in determining heat exchanger capacity is to divide the total net heat load by ΔT. Then select the heat exchanger with the same or higher Watts/°F or Watts/°C as the outcome of this process. —Indoor Industrial Example— An electronic system uses two components that draw 230 VAC at 7.5 A. Each has a rated efficiency of 90%. They are protected in a painted steel cabinet that is 60 in. (1524 mm) tall, 36 in. (914 mm) wide and 18 in. (457 mm) deep. The system will be located in a maximum ambient temperature of 80 F (27 C). The rated temperature of the electronics is 95 F (35 C). HEAT EXCHANGER CAPACITY (C) = [INTERNAL HEAT LOAD (A) – HEAT TRANSFER (B)] ÷ ΔT Internal heat load (A) may be determined using the “Component Power – Component Efficiency” method on page 8, given the available information. In this example, the estimated heat load is: Device Power = 230 x 7.5 = 1725 W Total Power = 2 x 1725 = 3450 Less Efficiency = 3450 x (1 - .90) Internal Heat Load = 345 W Heat transfer (B) is derived using the simple chart method, since this is an indoor industrial application. Both cabinet surface area and ΔT are needed to determine heat transfer. Cabinet surface area is 54 ft. 2 or 5.02 m 2 (from surface area formula on page 9). ΔT is 15 F (8 C)—the difference between ambient temperature and the rated temperature of the electronics. Heat Transfer (Cabinet Heat Loss) = Heat Transfer per ft. 2 or m 2 x Enclosure Surface Area Using the painted steel curve on the Heat Transfer chart on page 9, heat transfer per ft. 2 or m 2 is 3 W/ft. 2 or 32.5 W/m 2 . Heat Transfer = 3 W/ft. 2 x 54 ft. 2 = 162 W Now that we know internal heat load, heat transfer and ΔT, we can determine heat exchanger capacity as follows: HEAT EXCHANGER CAPACITY (C) = [345 WATTS (A) – 162 WATTS (B)] ÷ 15 F (or 8 C) HEAT EXCHANGER CAPACITY (C) = 12 W/°F or 22 W/°C The result is minimum heat exchanger capacity. If no heat exchanger model is similar to the result, choose the next largest size to ensure adequate electronics cooling. Power input, protection level and dimensions of the heat exchanger also need to fit the system. —Outdoor Example— A telecom system draws a total of 5,000 W; its efficiency is 85%. It is protected in a steel cabinet that is 72 ft. 2 (6.69 m 2 ) and painted with RAL 7035 light-gray paint. The enclosure walls are lined inside with 1 in. (25 mm) of insulation. The application will be deployed in a maximum ambient outdoor temperature of 104 F (40 C) with occasional winds reaching 15+ mph. The rated temperature of the electronics is 114 F (46 C). Air circulation inside the cabinet is moderate. HEAT EXCHANGER CAPACITY (C) = [INTERNAL HEAT LOAD (A) – HEAT TRANSFER (B)] ÷ DELTA ΔT Internal heat load (A) is determined using the “Component Power – Component Efficiency” method on page 8. In this example, the estimated heat load is as follows: Total System Power = 5000 W Less Efficiency = 5000 x (1 - .85) Internal Heat Load = 750 W Heat transfer (B) is derived using the equation method, since this is an outdoor application. For brevity, we will assume the English system (°F, inches and feet). q = (To - Ti) ÷ [(1/ho) + (1/hi) + R] “q” is heat transfer per surface area. For an explanation of the other variables, see “Equation Method” on page 10. q = (104 - 114) ÷ [(1/6) + (1/2) + 4] q = -2.14 W/ft. 2 Total Heat Transfer = 2.14 x 72 ft. 2 = 154 W (negative sign is ignored) ΔT is 10 F — the difference between ambient temperature and the rated temperature of the electronics. HEAT EXCHANGER CAPACITY (C) = [750 W (A) – 154 W (B)] ÷ 10 F HEAT EXCHANGER CAPACITY (C) = 60 W/°F As in the indoor industrial example, the above result is minimum heat exchanger capacity. If no heat exchanger model is similar to the result, choose the next largest size to ensure adequate electronics cooling. Power input, protection level and dimensions of the heat exchanger also need to fit the system. 12 Cooling SUBJECT TO CHANGE WITHOUT NOTICE EQUIPMENT PROTECTION SOLUTIONS
Selecting A Cooling Solution FRESH aIR EncloSURE Cooling oVERVIEW Fresh Air Enclosure Cooling Overview Introduction There are many standard air movers for electronics cooling on the market today. Common options include: Compact Axial Fans Filter Fan As one may conclude by looking at the products, each fresh air cooling solution can vary in terms of: • General vs. concentrated airflow • Amount of air volume (CFM or M 3 /Hr.) • Ability to overcome airflow restriction caused by electronics components (static pressure—Inches of H2O or Pascals) • Component price • Power input (AC or DC volt) • Ability to protect the electronics from dust and water However, before we begin to briefly review the advantages and disadvantages of each air mover, we first need to understand two important concepts, airflow and static pressure, because each fresh air cooling solution can be quite different with these factors. 1 Server Rack Fan Tray Motorized Impeller Centrifugal Blower What iS Airflow? Airflow is the volume of air that a fan, impeller or blower can move. In the English system, airflow is measured in cubic feet per minute or CFM. In the Metric system, airflow is defined as cubic meters per hour or M 3 /Hr. Electronic systems with low heat loads (100 to 1000 Watts) require less airflow to cool the components. Cabinets with moderate to high heat loads (more than 1000 Watts) need more airflow. What Is Static Pressure? Static pressure is air restriction created by the components inside the enclosure. In the English system, static pressure is expressed in Inches of Water or In. H2O. In the Metric system, static pressure is Pascals or Pa. Systems with loosely packed components have low static pressure (0.24 to 0.50 In. H2O) and use a smaller, less powerful air mover such as a tube axial fan or filter fan for cooling. However, cabinets that are moderately to densely packed with electronics (0.75 In. H2O or more) require a larger, more powerful air mover or multiple air movers. Low Static Pressure Lightly Packed Moderately Packed Densely Packed Electronics Electronics Electronics Under 0.75 In. H 2 O 0.75 - 1.75 In. H 2 O Over 1.75 In. H 2 O (187 Pa) (187 - 436 Pa) (436 Pa) High Static Pressure EQUIPMENT PROTECTION SOLUTIONS PH 763.422.2211 • FAX 763.576.3200 • MCLEANCOOLINGTECH.COM Cooling 13
Page 1 and 2: Cooling SPECIFIER’S GUIDE EQUIPME
Page 3 and 4: Table of Contents QUICK REFERENCE C
Page 5 and 6: Quick Reference Side Mount Roof Mou
Page 7 and 8: Intro Page Chapter Contents Selecti
Page 9 and 10: Selecting A Cooling Solution oVERVI
Page 11 and 12: Selecting A Cooling Solution Sealed
Page 13 and 14: Selecting A Cooling Solution Sealed
Page 15: Selecting A Cooling Solution Sealed
Page 19 and 20: Selecting A Cooling Solution FRESH
Page 25 and 26: Intro Page Chapter Contents Technic
Page 27 and 28: Technical InfoRMATion UL and IP DEF
Page 29 and 30: Technical InfoRMATion UL and IP DEF
Page 31 and 32: Intro Page Chapter Contents Sealed
Page 33 and 34: Sealed EncloSURE Cooling aIR ConDIT
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Sealed EncloSURE Cooling VoRTEX Coo
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Intro Page FAN TRAYS Fan Trays deli
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Fresh Air EncloSURE Cooling DIRECT
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Fresh Air EncloSURE Cooling FilTER
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Fresh Air EncloSURE Cooling PackaGE
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Fresh Air EncloSURE Cooling aIR MoV
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Fresh Air EncloSURE Cooling BloWERS
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Fresh Air EncloSURE Cooling aCCESSo
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Intro Page Chapter Contents Accesso
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Accessories Condensation ManaGEMEnt
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Accessories EncloSURE HeaTERS Semic
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Accessories EncloSURE HeaTERS Elect
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Accessories EncloSURE HeaTERS 5 EQU
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Accessories EncloSURE HeaTERS Hazar
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Accessories ControllERS Dual Thermo
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Accessories ControllERS Mechanical
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Accessories ControllERS Panel-Mount
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Accessories ControllERS Notes 5 EQU
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Accessories PRESSURE CoMPEnsation P
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6 Catalog nUMBER Index PH FAX MCLEA
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Notes
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SKARPNÄCK HEMEL HEMPSTEAD DZIERŻO
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SPECIFIER’S GUIDE

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