Power Consumption To Heat Dissipation Calculator

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Ihave a couple of projects coming I'm working on that require this. For one situation I need to provide the heat dissipated for some routers, switches, UPSs, and two-way radio repeaters I'm installing in leased rack space in a equipment room.

I also have a situation where I need to install a router and UPS in a storage cabinet in an RV type vehicle. In that case I think it's important to be reasonably accurate. As far as I can tell, this information isn't listed on spec sheets by Cisco, Motorola, or even APC, so I assume I need to calculate it myself some way.

Oh but it is! The worst case is the power rating on the rating label. If a device can consume 100VA worst case, then that's how much heat it will dump, worst case. You can assume that VA=W and convert that to BTU/hr, horsepower, etc.

The only case in IT equipment where it's not true is PoE switches: they dump some of that power wherever the loads are. Other than that, all electrical devices in the racks of a data center are 100% efficient heaters.

All of the electricity you pump into a stand-alone data center gets dumped right out through the HVAC system. Thermodynamically speaking, the amount of "work" that the computers actually do by "computing" is so astronomically minuscule, that we don't need to think about it.

If you're nitpicking then yes, a few hundred watts will go out to the IP cameras on and around the building. But you're not gonna save any money by taking it into account in thermal calculations for a data center. For an office server closet - it may be important if there's lots of PoE equipment hanging off the switches. But you won't go wrong if you just go conservative and assume power into the closet = heat to be taken out of the closet.

Nowadays with AI you should be able to get most heat dissipation values. I myself am currently trying to find BTU/h for some equipments for a energy usage study I'm conducting in a ISP I work for. Though some suppliers promptly have this number, a few I had to get in contact with to get.My guess is there is a standartized method to get this.I came across this presentation I took the liberty to post at least on slide of it. I guess it is ok to share, sincce I found it with no effort at all.

I am currently working on a project to set up a new LAN and WAN for my customer's new site. This site will be multi-level building, with Cisco IP Phones for each floor. I have sized up each floor to require 1 floor switch with the following spec:

During one of our discussions with the building and electrical contractors, there are several questions around the power consumption, heat dissipation, and power oversubscription that I could not find anywhere on the CCO. The questions are as follows:

3. Considering the max power output of the 4200W ACV PSU, the electrical contractor believes that the heat dissipation should've been higher than the 3580 BTU/hr that the data sheet claims. Is 3580 BTU/hr max heat dissipation for each 4200W PSU accurate?

4. In the event that all ports on the switch are configured as "static ports", in the event of a power oversubscription, what is the order of ports being shutdown by the switch? Is it starting from the vert last port on the last (i.e. bottom) blade?

Use this calculator to estimate the cooling needs of a typical room or house, such as finding out the power of a window air conditioner needed for an apartment room or the central air conditioner for an entire house.

This is a general purpose calculator that helps estimate the BTUs required to heat or cool an area. The desired temperature change is the necessary increase/decrease from outdoor temperature to reach the desired indoor temperature. As an example, an unheated Boston home during winter could reach temperatures as low as -5F. To reach a temperature of 75F, it requires a desired temperature increase of 80F. This calculator can only gauge rough estimates.

The British Thermal Unit, or BTU, is an energy unit. It is approximately the energy needed to heat one pound of water by 1 degree Fahrenheit. 1 BTU = 1,055 joules, 252 calories, 0.293 watt-hours, or the energy released by burning one match. 1 watt is approximately 3.412 BTU per hour.

BTU is often used as a point of reference for comparing different fuels. Even though they're physical commodities and are quantified accordingly, such as by volume or barrels, they can be converted to BTUs depending on the energy or heat content inherent in each quantity. BTU as a unit of measurement is more useful than physical quantity because of fuel's intrinsic value as an energy source. This allows many different commodities with intrinsic energy properties, such as natural gas and oil, to be compared and contrasted.

BTU can also be used pragmatically as a point of reference for the amount of heat that an appliance generates; the higher the BTU rating of an appliance, the greater the heating capacity. As for air conditioning in homes, even though ACs are meant to cool homes, BTUs on the technical label refer to how much heat the air conditioner can remove from their respective surrounding air.

The following is a rough estimation of the cooling capacity a cooling system would need to effectively cool a room/house based only on the square footage of the room/house, as provided by EnergyStar.gov.

Generally, newer homes have better insulating ability than older homes due to technological advances as well as stricter building codes. Owners of older homes with dated insulation who decide to upgrade their insulation may not only benefit from lower utility bills, but may also see an appreciation in the value of their homes.

Thermal resistance, which is a measure of a material's resistance to heat flow, is indicated by a material's R-value. The higher the R-value of a certain material, the more resistant it is to heat transfer. In other words, when shopping for home insulation, higher R-value products are better at insulating, though they're usually more expensive.

When deciding on the proper input for the "insulation condition" field in the calculator, use generalized assumptions. A beach bungalow built in the 1800s with no renovations should probably be classified as poor. A 3-year-old home inside a newly developed community most likely deserves a good rating. Windows normally have poorer thermal resistance than walls. Therefore, a room with lots of windows normally means poor insulation. When possible, try to install double-glazed windows to improve insulation.

To find the desired change in temperature to input into the calculator, find the difference between the unaltered outdoor temperature and the desired temperature. As a general rule of thumb, a temperature between 70 and 80F is a comfortable temperature for most people.

For example, a home owner in Atlanta might want to determine their BTU usage during winter. Atlanta winters tend to hover around 45F and temperatures may fall as low as 30F occasionally. Given that the desired temperature of the residents is 75F, the desired temperature increase would be 75F - 30F = 45F.

Homes in more extreme climates are subject to larger fluctuations in temperature, which typically results in higher BTU usage. For instance, heating a home in Alaska during winter, or cooling a home during a Houston summer will require more BTUs than heating or cooling a home in Honolulu, where temperatures tend to stay around 80F year-round.

Environmental effects can severely impact data center equipment. Excessive heat buildup damages servers, causing them to shut down automatically. Regularly operating them at higher-than-acceptable temperatures shortens their life span and leads to more frequent replacement.

It's not just high temperatures that are a danger. High humidity leads to condensation, corrosion and contaminant buildup, such as dust, gathering on equipment in a data center. Meanwhile, low humidity leads to electrostatic discharges between two objects that damage equipment, too.

ASHRAE develops and publishes thermal and humidity guidelines for data centers. The latest edition outlines the temperatures and humidity levels at which you can reliably operate a data center based on the equipment classification.

Determining the proper environment for IT equipment depends on its classification -- A1 to A4 -- which is based on the type of equipment it is and how it should run, in descending order of sensitivity. A1 equipment refers to enterprise servers and other storage devices that require the strictest environmental control. The A4 class applies to PCs, storage products, workstations and volume servers and has the broadest range of allowable temperatures and humidity.

Previous versions of these guidelines focused on reliability and uptime rather than energy costs. To align with data centers' increasing focus on energy-saving techniques and efficiency, ASHRAE developed classes that better outline the environmental and energy impact.

One thing to remember is that some older equipment might have been designed to older ASHRAE cooling standards. If your data center has a mix of equipment, you must figure out an acceptable temperature and humidity range for all the equipment in your facility.

Generally speaking, the power consumed by an IT device is nearly all converted into heat, while the power sent through data lines is negligible. That means the thermal output of the device in watts is equal to its power consumption.

Beyond the special environmental factors mentioned previously, a few other factors can influence a data center's heat output calculations. Ignoring them could lead to an incorrectly sized cooling system and increase your overall cooling investment.

HVAC systems are often designed to control humidity and remove heat. Ideally, they keep a constant humidity level, yet the air-cooling function often creates substantial condensation and a loss of humidity. This being the case, many data centers use supplemental humidification equipment to make up for this loss, adding more heat.

Large data centers with significant air mixing -- the mixing of hot and cold air from areas inside the facility -- generally need supplemental humidification. The cooling system must help compensate for the movement of the hotter air in the facility. As a result, these data centers must oversize their cooling systems by up to 30%.

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