Insulated HVAC Transition Box With Thin Composite Insulation
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Solution Overview
Problem
Existing HVAC transition boxes face challenges in achieving increased resistance to thermal transfer while maintaining a standard size, as increased insulation thickness is required by new building codes, but this is difficult due to limited space and reduces R value when compressed.
Innovation Solution
The use of a combination of a mineral wool layer and a reflective laminate layer, where the reflective laminate layer is placed outside or inside the transition box, forming a composite with a combined thickness less than 2 inches, providing enhanced thermal resistance without the need for assembly by the installer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If increased thickness of mineral wool insulation is used to increase R value, then thermal resistance is improved, but the insulation cannot fit within a standard size transition box
Solution Approach 1:
The patent combines mineral wool insulation with a reflective insulation layer to create a composite insulation system. This composite structure achieves higher R values in a thinner overall package, allowing the insulation to meet increased thermal resistance requirements while fitting within standard transition box dimensions.
Solution Approach 2:
The invention changes the composition and structure of the insulation system by introducing a reflective layer with different thermal properties. This parameter change in material composition allows achieving superior thermal resistance without proportionally increasing insulation thickness.
2Volume of moving object
If mineral wool insulation is compressed to fit inside the transition box, then the insulation fits within available space, but the R value is reduced
Solution Approach 1:
By using a composite of mineral wool and reflective insulation, the system achieves high thermal resistance without requiring thick compressed layers. The reflective layer provides thermal barrier properties that complement the mineral wool, maintaining R value while reducing overall thickness.
3Temperature
If the size of the register box is increased to accommodate thicker insulation, then thermal resistance is improved, but the box becomes costly and reduces available operable locations
Solution Approach 1:
The composite insulation system enables standard-sized register boxes to achieve higher R values, avoiding the need for custom larger boxes. This maintains compatibility with existing installation locations and reduces manufacturing costs while meeting updated thermal resistance standards.
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 configuration allows for higher R values to be achieved in smaller formats, meeting increased thermal resistance standards while allowing installation in previously inaccessible spaces, reducing energy costs and improving indoor air quality.
Implementation Method 1
a reflective laminate layer having a second R value overlies the mineral wool layer
Implementation Method 2
A mineral wool layer having a first R value is adjacent the inside surface of the box
Data Source
AI summary
An insulated HVAC duct component such as a transition box includes a first insulation layer and a second, different insulation layer. The transition box includes at least four sidewalls and one of a top and a back wall, the transition box further including a first access port and a second access port, the first access port having a different cross section than the second access port, one of the access ports being spaced from a nearest sidewall by less than 2 inches. The first insulation layer is located along an inside surface of the box. The second different insulation layer overlies the first insulation layer, the second different insulation layer having an air impervious surface, wherein the combined thickness of the first insulation layer and the second different insulation layer is less than 2 inches.