Hot water radiators are designed to work with temperature deltas in the 110 degree F range (target 70 room temp, 180 water temp). In the summer your temperature deltas are much tighter, you can only get to at best 32 F before the water freezes and with a target of 70 that’s only 38 degrees of temperature delta trying to cool the room. They simply won’t work efficiently enough for it to be worth it, not to mention being on the floor is very poor positioning for summer.
Delta is commonly used to refer to a difference between two points. So in this case, a delta of 110 degrees means whatever your target temperature is, the radiator should be 110 degrees away from that temperature. Trying to reach 70° means a temp of 180 at the radiator when heating, or -40° when cooling. OP was pointing out that -40° obviously isn’t a feasible temperature for a water-based radiator, so they simply aren’t great for cooling.
Hot water radiators are designed to work with temperature deltas in the 110 degree F range (target 70 room temp, 180 water temp). In the summer your temperature deltas are much tighter, you can only get to at best 32 F before the water freezes and with a target of 70 that’s only 38 degrees of temperature delta trying to cool the room. They simply won’t work efficiently enough for it to be worth it, not to mention being on the floor is very poor positioning for summer.
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Delta is commonly used to refer to a difference between two points. So in this case, a delta of 110 degrees means whatever your target temperature is, the radiator should be 110 degrees away from that temperature. Trying to reach 70° means a temp of 180 at the radiator when heating, or -40° when cooling. OP was pointing out that -40° obviously isn’t a feasible temperature for a water-based radiator, so they simply aren’t great for cooling.
Temperature difference between the radiator water and room air.