Air Gap Absorption Material for Humidity-Driven Cooling and Heating
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Solution Overview
Problem
Buildings consume a significant portion of global energy, primarily for maintaining comfortable temperature and humidity levels, with existing energy-saving technologies failing to keep pace with growing demand, especially in climates with large temperature and humidity variations.
Innovation Solution
The implementation of a ventilated facade system utilizing an absorption material that absorbs and desorbs moisture to regulate temperature and humidity through evaporative cooling and absorption heating, complementing thermal mass technologies, with a controller optimizing energy use based on humidity and temperature cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal mass is used to maintain stable temperatures, then temperature variations are reduced, but the system requires heavy construction elements and does not address humidity variations
Solution Approach 1:
The patent employs phase transitions of water (evaporation and condensation) within the absorption material to achieve thermal regulation. When water evaporates from the material, it absorbs latent heat cooling the building; when water condenses, it releases heat warming the building. This phase-change mechanism provides temperature stability without requiring heavy thermal mass construction elements.
Solution Approach 2:
The absorption material's moisture content parameter is dynamically changed to regulate both temperature and humidity. By controlling the water content in the material through evaporation and condensation cycles, the system simultaneously addresses temperature stability and humidity control, overcoming the limitation of traditional thermal mass that only addresses temperature.
2Ease of operation
If traditional HVAC systems are used to maintain comfortable conditions, then temperature and humidity control is achieved, but energy consumption continues to rise exponentially
Solution Approach 1:
The absorption material performs self-regulating moisture and temperature control through natural evaporation and condensation processes driven by ambient humidity fluctuations. The material automatically absorbs moisture from humid air (releasing heat) and releases moisture to dry air (absorbing heat), providing comfort maintenance without continuous external energy input, thereby dramatically reducing HVAC energy consumption.
Solution Approach 2:
The system converts the harmful effect of humidity fluctuations into a beneficial resource. Instead of treating high humidity as a problem requiring energy-intensive dehumidification, the system utilizes humidity fluctuations to drive the absorption-desorption cycle, generating free cooling and heating effects that reduce overall energy consumption while maintaining comfort.
3Temperature
If absorption material is continuously activated to cool or heat air, then temperature control is improved, but energy efficiency decreases due to unnecessary activation during extreme conditions
Solution Approach 1:
The system incorporates sensors that continuously monitor temperature, humidity, and pressure conditions to control activation of the absorption material. The feedback control mechanism activates cooling only when temperature exceeds thresholds and humidity is appropriate for evaporation, and activates heating only when temperature is low and humidity favors condensation, preventing unnecessary energy consumption during extreme conditions where the absorption process would be ineffective.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces peak temperature and humidity variations, leading to significant energy savings by selectively activating the absorption material to cool, heat, or dehumidify air, enhancing the efficiency of heating and cooling processes.
Implementation Method 1
When a material absorbs water it releases energy, heating the surroundings
Implementation Method 2
When water evaporates from a material it absorbs both latent energy and binding energy, cooling the surroundings
Implementation Method 3
When water goes from its liquid phase into the vapor phase it absorbs energy
Implementation Method 4
Symmetrically, when it goes from gas to liquid it releases energy
Data Source
AI summary
Air gap insulation is a common means of providing thermal insulation from the environment. In many cases the air gap is heated by direct or indirect solar radiation, so ventilating this gap has a cooling effect. The invention cools this gap by integrating moisture-absorption material units that harvest water from the air during the night and provide evaporative cooling during the day. Compared to the ambient air, the daily relative humidity fluctuations in the air gap are more extreme, allowing a significant cooling effect. Furthermore, during the night, humidity absorption on the absorption unit reduces the risk of condensation within the air gap. Additionally the absorption process generates heat, and by using a controller processes of heating, cooling and dehumidifying can be activated when possible and needed.