If your reading this from the UK you’ll know that there’s a large time of year when our weather is less than hot. 1 ton of cooling is equivalent to 12 thousand BTUs. Larger units may be rated in tons of cooling. Small units may fit in windows, venting to the outside world. Small air conditioning units have a cooling capacity of between 500 BTUs. This is the amount of cooling required so you need one or more air conditioning units to handle that amount of heat. Total Heat Load = Room Area BTU + Windows BTU + Total Occupant BTU + Equipment BTU + Lighting BTU Lighting BTU = Total wattage for all lighting x 4.25 Take the total wattage of the lighting and multiply by 4.25. However, it is probably safer to overestimate the wattage than underestimate it.Īdd together all the wattages for Servers, Switches, Routers and multiply by 3.5.Įquipment BTU = Total wattage for all equipment x 3.5 The wattage on equipment is the maximum power consumption rating, the actual power consumed may be less. This is trickier to calculate that you might think. Total Occupant BTU = Number of occupants x 400Ĭlearly most heat in a Server Room is generated by the equipment. The heat output is around 400 BTU per person. Purpose built Server Rooms don’t normally have people working in them, but if people do regularly work in your Server Room you will have to take that into account. Windows BTU = South Window(s) BTU + North Window(s) BTU Add together all the BTUs for the windows. Obviously if you are in the Southern Hemisphere you would swap the conversion factors as the heat on North facing windows is then greatest. If there are no blinds on the windows multiply the result(s) by 1.5. North Window BTU = North Facing windows Length (m) x Width (m) x 165 ![]() South Window BTU = South Facing windows Length (m) x Width (m) x 870 If, however there are windows you need to take the size and orientation into account. If, as is quite common, your Server Room has no windows, you can ignore this part of the calculation. Room Area BTU = Length (m) x Width (m) x 337 The amount of cooling required depends on the area of the room. ![]() The size and position of windows, and whether they have blinds or shades.The heat load depends on several factors, by considering those that apply in your circumstances and adding them together a reasonably accurate measure of the total heat can be calculated. Heat is measured in either British Thermal Units (BTU) or Kilowatts (KW). The amount of heat generated is known as the heat gain or heat load. Early warning of problems and spare capacity in the cooling system are both highly desirable. Failure of the air conditioning can have serious consequences for the equipment itself and for your company. Providing sufficient cooling is essential to ensure reliable running of servers, routers, switches and other critical equipment. This guide doesn’t go into every detail of possible heat sources it should be used to give you an idea of the amount of cooling you might need.įire regulations often require that server rooms have levels of insulation far above that of a normal office. In practice, it’s rather more complicated. In theory, it’s easy to calculate the size of the air con unit needed for your server room, you add together all heat sources and install an air con unit that can remove that much. Here’s a quick guide to show you how we work out your requirements for an air conditioning unit for your Server Room or Data Centre. How to Calculate the Size of a Server Room Air ConditionerĪs IT professionals, we frequently find ourselves needing to cross over the IT boundaries past the usual server support and network support and explore other disciplines, one such time is when refitting and setting up server rooms.
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