It is equal to the amount of work done when a force of 1 newton displaces a mass through a distance of 1 metre in the direction of the force applied. The joule (pronounced / ˈ dʒ uː l/, JOOL or / ˈ dʒ aʊ l/ JOWL symbol: J) is the unit of energy in the International System of Units (SI). For other uses, see Joule (disambiguation). Note: Most modern hard drives record the hard drive temperature in an internal log which can be examined at a later date by an engineer.This article is about the unit of energy. If possible, an ambient room temperature of approximately 20 degree Celsius is recommended. If the room temperature rises above this level, it may lead to premature hard drive failure, CPU thermal shutdown or data loss. RM servers are normally rated up to a maximum ambient temperature of 35 degree Celsius. These power meters are typically £20-£30 and can save a lot of research and calculation, they can also be used to test for voltage drops, etc. These can measure Kw/hours which can easily be converted into BTU/hr (1kw/hr = 3412 BTU/hr). Power meters can be purchased from many electrical suppliers which simply plug into a mains socket and then connect the equipment under test to the power meter. In the example above, each server would need cooling for a minimum of 2600BTU and a maximum of 4100BTU. There is a linear increase in heat output for multiple servers. Web-based conversion calculators can be easily found (e.g. The rack selected and the ventilation provided must be suitable to the environment in which the server will be used. It must also include ventilation sufficient to exhaust a maximum of 4,100 BTUs per hour for the server. Important: For ventilation, the equipment rack must provide sufficient airflow to the front of the server to maintain proper cooling. Officially, Intel recommends the following for the one SystemBase AXIII chassis (in a rack): When calculating the amount of cooling (air conditioning) required in a room, you should take into account that the room should always be maintained at an ambient temperature of much less than 35 degree Celsius and that any other equipment in the room will also generate heat. īased on the 754 watt figure, BTUs/hr = (754 watts * 3600) / 1054 = 2577 BTUs per hour, per server. Heat output is measured in British Thermal Units (BTUs) - 1kw/hr = 3412 BTU/h or 1000 BTU/h is around 293W. Realistically, the maximum power under normal operating conditions will be around 650 watts. the very maximum power this server will consume under 100% load will be 754 watts. 69% efficient).įor the UK mains 230V AC 3.28A gives you 754 watts and therefore 60% efficiency. Output power: The maximum power in Watts that can be drawn from the PSU by the server mainboard, hard drives, CPU, memory, etc.įor example: The 450 watts redundant PSU in SystemBase AXIII has a maximum input power of 200V 3.28Amps = 656 watts consumed maximum (i.e. See Server PSU articles for individual range specs. The maximum a power supply can take is often expressed as a Voltage (Volts) at a certain Current (Amps), multiplying these gives the maximum input power in Watts. Input power: The power in Watts that is fed from the mains into a PSU. This implies that say a 200 watt maximum output PSU would consume 333 watts of input power to supply these 200 watts on full load. Guidelines for calculating the heat output and power consumption of RM systems.Īll power supplies, whether in desktops or servers, are on average approximately 60%-80% efficient. How to calculate the heat output of a PC or Server
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