3 ms·

Since when does cooling get measured in watts?

polishdude20 8mo ago
But/hr is convertible to watts. It's how much energy per hour gets removed from the space.
lm28469 8mo ago
It's the SI unit, what else do you want to use lol? Americans measure it in bald eagle wing flaps per football fields but that's just an American thing
- quickthrowman 8mo ago
  > It's the SI unit, what else do you want to use lol? HVAC companies in the US exclusively use ‘tons’ to describe the amount of heat a chiller or heat pump can move. Trane, Daikin, and more all use ‘tons’ on both their marketing and engineering material. 1 ton ~= 3.56kW, but a 1-ton chiller will use ~= 1kW of electricity to remove 3.56kW of heat due to the COP of 3-4 for an air cooled chiller. Daikin Chillers: https://www.daikinapplied.com/products/chiller-products https://www.daikinapplied.com/products/chiller-products Trane Chillers: https://www.trane.com/commercial/north-america/us/en/products-systems/chillers/air-cooled-chillers.html https://www.trane.com/commercial/north-america/us/en/product...
  - thatguy27 8mo ago
    That's really not appropriate for the topic at hand. And what happens when the technology improves and the 1 kW ~= 3.65 kW relation changes?
    - lm28469 8mo ago
      The COP isn't constant either. I can drop to 1:1 or even lower if you need to run the anti frost resistance Good marketing gimmick though
mindslight 8mo ago
Since every cooler review took payola to pump bogus performance charts so they never settled on scientific measurements. For those wondering, the standard measure is thermal resistance in degrees per watt, for linear systems - doubling the heat that needs to be transferred doubles the temperature difference between the sides. Adding in heat pipes, liquid convection, etc is going to make the system non-linear, so then it makes sense to talk in terms of the delta-T at given wattages. And then since there are phase-change materials, the working temperature should be specified as well. Yes, there are three scalars before you even get to things like scaling fan speed. (I'm not a mechE so I'm sure there's something I'm missing still)

But/hr is convertible to watts. It's how much energy per hour gets removed from the space.

It's the SI unit, what else do you want to use lol? Americans measure it in bald eagle wing flaps per football fields but that's just an American thing

quickthrowman 8mo ago
> It's the SI unit, what else do you want to use lol? HVAC companies in the US exclusively use ‘tons’ to describe the amount of heat a chiller or heat pump can move. Trane, Daikin, and more all use ‘tons’ on both their marketing and engineering material. 1 ton ~= 3.56kW, but a 1-ton chiller will use ~= 1kW of electricity to remove 3.56kW of heat due to the COP of 3-4 for an air cooled chiller. Daikin Chillers: https://www.daikinapplied.com/products/chiller-products https://www.daikinapplied.com/products/chiller-products Trane Chillers: https://www.trane.com/commercial/north-america/us/en/products-systems/chillers/air-cooled-chillers.html https://www.trane.com/commercial/north-america/us/en/product...
- thatguy27 8mo ago
  That's really not appropriate for the topic at hand. And what happens when the technology improves and the 1 kW ~= 3.65 kW relation changes?
  - lm28469 8mo ago
    The COP isn't constant either. I can drop to 1:1 or even lower if you need to run the anti frost resistance Good marketing gimmick though

mindslight 8mo ago

Since every cooler review took payola to pump bogus performance charts so they never settled on scientific measurements. For those wondering, the standard measure is thermal resistance in degrees per watt, for linear systems - doubling the heat that needs to be transferred doubles the temperature difference between the sides. Adding in heat pipes, liquid convection, etc is going to make the system non-linear, so then it makes sense to talk in terms of the delta-T at given wattages. And then since there are phase-change materials, the working temperature should be specified as well. Yes, there are three scalars before you even get to things like scaling fan speed. (I'm not a mechE so I'm sure there's something I'm missing still)