Ductwork System for Modulating Conditioned Air
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Solution Overview
Problem
Retrofitting facilities without central air conditioning systems to accommodate ductwork poses challenges due to tortuous routing and extreme temperature variations in attic spaces, leading to significant energy losses and inefficient airflow.
Innovation Solution
A temperature modulating blanket incorporating phase change materials with a predetermined melting range is secured to ductwork in attic spaces to minimize heat transfer and temperature gradients, ensuring consistent airflow and reducing energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ductwork is routed through attic space to service rooms, then installation ease is improved, but heat transfer to conditioned air increases
Solution Approach 1:
A temperature modulating blanket is introduced as an intermediary layer between the hot attic environment and the ductwork. This blanket contains phase change materials that absorb excess heat during the day and release it at night, acting as a thermal buffer that protects conditioned air from attic heat while maintaining the installation advantage of using attic space
Solution Approach 2:
The temperature modulating blanket utilizes phase change materials (such as paraffin wax or salt hydrates) that undergo phase transitions between solid and liquid states. During the day, these materials absorb heat as they melt, preventing heat transfer to the ductwork. At night, they release stored heat as they freeze, reducing the temperature differential and energy losses
2Loss of energy
If conventional insulation is used in hot attic spaces, then some heat protection is provided, but energy losses remain significant
Solution Approach 1:
The temperature modulating blanket employs phase change materials that actively absorb and release thermal energy through phase transitions. This dynamic thermal regulation significantly outperforms conventional static insulation, reducing energy losses by maintaining more stable temperatures in the ductwork and preserving conditioned air output
Solution Approach 2:
The phase change materials in the blanket autonomously regulate temperature without requiring external control systems. They automatically absorb heat when temperatures rise and release heat when temperatures fall, providing self-regulating thermal protection that reduces energy losses and maintains productivity
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
The solution effectively regulates temperature differentials, reducing airflow turbulence and energy losses by maintaining a consistent temperature distribution within ductwork, enhancing the efficiency of conditioned air delivery and extending the life of HVAC systems.
Implementation Method 1
A temperature modulating blanket is secured to the ductwork and accommodates a phase change material with a predetermined melting range for minimizing a total amount of heat reaching the conditioned air in the ductwork
Implementation Method 2
The blanket also serves to minimize a range of the gradient of uneven temperature reaching the conditioned air from the attic space
Data Source
AI summary
A ductwork system including a temperature modulating blanket with phase change material. The system allows for attic installation of ductwork while substantially avoiding effects of excessive temperatures and temperature gradients of the attic space on conditioned air run through the ductwork. Thus, smaller HVAC and overall power requirements may be realized for air conditioning applications in structural facilities. This may be of particular benefit for structural facilities retrofitted with HVAC systems where attic space is more likely to be made greater use of for accommodating ductwork.