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No, this device is explicitly not one of those: > The system, based on relatively new high-surface-area materials called metal-organic frameworks (MOFs), can e

by Zaak 9y ago

No, this device is explicitly not one of those: > The system, based on relatively new high-surface-area materials called metal-organic frameworks (MOFs), can extract potable water from even the driest of desert air, the researchers say, with relative humidities as low as 10 percent. Current methods for extracting water from air require much higher levels ... above 50 percent for dew-harvesting refrigeration-based systems

dogma1138 9y ago
Thanks for trying to explain instead of simply cluelessly down voting but this still does not answer my question. This is a Peltier device you can see the power wires and the heat sink on the hot side. Are MOFs used in the construction of the Peltier for example are Cu3-BTC MOFs used to increase the surface area of the cold plate which improves condensation or are MOFs used as a membrane to increase the humidity in the condensation chamber to above ambient? I really don’t understand why people get triggered by honest questions and decide to burry them.
- philipkglass 9y ago
  The full paper is open access. Those wires are going to thermocouples, not Peltier devices: https://www.nature.com/articles/s41467-018-03162-7/figures/2 https://www.nature.com/articles/s41467-018-03162-7/figures/2 There is a heat sink, but it's not dissipating electrically produced heat. From the paper: During day-time water production, the enclosure is closed and the solar absorber side is covered with an optically transparent thermal insulator (OTTI aerogel). The MOF layer is heated by exposure to solar irradiance, causing water release (desorption). The desorbed water vapour diffuses from the MOF layer to the condenser due to a concentration gradient. Accumulation of vapour in the enclosure leads to saturation conditions and consequently, the condensation process occurs at ambient temperature. The heat of condensation is dissipated to the ambient by a heat sink.
  - dogma1138 9y ago
    Brilliant! Thank you for taking the time linking the paper looks very interesting.

by Zaak 9y ago

dogma1138 9y ago

Thanks for trying to explain instead of simply cluelessly down voting but this still does not answer my question. This is a Peltier device you can see the power wires and the heat sink on the hot side. Are MOFs used in the construction of the Peltier for example are Cu3-BTC MOFs used to increase the surface area of the cold plate which improves condensation or are MOFs used as a membrane to increase the humidity in the condensation chamber to above ambient? I really don’t understand why people get triggered by honest questions and decide to burry them.

philipkglass 9y ago
The full paper is open access. Those wires are going to thermocouples, not Peltier devices: https://www.nature.com/articles/s41467-018-03162-7/figures/2 https://www.nature.com/articles/s41467-018-03162-7/figures/2 There is a heat sink, but it's not dissipating electrically produced heat. From the paper: During day-time water production, the enclosure is closed and the solar absorber side is covered with an optically transparent thermal insulator (OTTI aerogel). The MOF layer is heated by exposure to solar irradiance, causing water release (desorption). The desorbed water vapour diffuses from the MOF layer to the condenser due to a concentration gradient. Accumulation of vapour in the enclosure leads to saturation conditions and consequently, the condensation process occurs at ambient temperature. The heat of condensation is dissipated to the ambient by a heat sink.
- dogma1138 9y ago
  Brilliant! Thank you for taking the time linking the paper looks very interesting.