Re:Sony Android TVs waste 25W in standby due to built-in Goo...
by closewith on Monday September 19, 2022 @04:55AM
(#32895913)
Chest freezers do have much thicker insulation on all walls (as they aren't constrained by the standard widths (24 to 40 in in the US, I think? 60-90 cm in the EU).
Chest freezer seals are far better than upright freezer seals because:
* The length of the seal is smaller compared to volume,
* The height of the seal is not constrained by the closing magnets (as mechanical latches are not legal on consumer freezers),
* The temperature differential at the top of the freezer is smallest.
The specific heat capacity of air at constant pressure is ~1 kJ/kg K and 1 m^3 air has a mass of ~1.2 kg, so 1 kJ/kg K * 1.2 kg = 1.1 kJ/K. Even a freezer that exchanges 2 m^3 of air for outside air at say a 70K differential (the difference between -40C and a 30C room) for each opening only has to remove 1.1kJ/K * 2 * 70K = 154kJ, or 0.05 kWh, which is the standard unit of electricity.
An unit of residential electricity in the most expensive US State (Hawaii) is 41.2c / kWh, so opening our enormous freezer in the worst possible conditions and completely exchanging the air using the most expensive electricity costs us 2ยข. It's a complete non-factor.
Chest freezer seals are far better than upright freezer seals because:
* The length of the seal is smaller compared to volume,
* The height of the seal is not constrained by the closing magnets (as mechanical latches are not legal on consumer freezers),
* The temperature differential at the top of the freezer is smallest.
The specific heat capacity of air at constant pressure is ~1 kJ/kg K and 1 m^3 air has a mass of ~1.2 kg, so 1 kJ/kg K * 1.2 kg = 1.1 kJ/K. Even a freezer that exchanges 2 m^3 of air for outside air at say a 70K differential (the difference between -40C and a 30C room) for each opening only has to remove 1.1kJ/K * 2 * 70K = 154kJ, or 0.05 kWh, which is the standard unit of electricity.
An unit of residential electricity in the most expensive US State (Hawaii) is 41.2c / kWh, so opening our enormous freezer in the worst possible conditions and completely exchanging the air using the most expensive electricity costs us 2ยข. It's a complete non-factor.
Source for prices: https://www.energybot.com/electricity-rates-by-state.html