Precast Concrete Wall Panel With Capillary Tube Thermal Control
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Solution Overview
Problem
The construction industry faces challenges in reducing greenhouse gas emissions associated with building materials and maintaining thermal comfort in buildings, particularly in regulating interior temperatures efficiently.
Innovation Solution
A construction panel design featuring a rigid insulation layer sandwiched between outer and inner concrete wythes, with a capillary tube system for temperature control, and a grid system to secure the wythes, which integrates geopolymer concrete to reduce carbon footprint and enhance thermal mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If traditional Portland cement concrete is used for construction, then structural strength and durability are achieved, but greenhouse gas emissions increase
Solution Approach 1:
The patent changes the chemical composition parameters of concrete by replacing Portland cement with geopolymer binder made from industrial byproducts (fly ash, slag). This substitution maintains structural strength while dramatically reducing CO2 emissions associated with cement production, directly addressing the contradiction between strength and harmful emissions
Solution Approach 2:
The patent creates a composite wall system combining geopolymer concrete wythes with rigid insulation materials. This composite approach achieves structural integrity through the geopolymer concrete while the insulation layer provides thermal performance, resolving the contradiction by using material compositing rather than relying solely on concrete thickness
2Use of energy by moving object
If thermal insulation is increased to reduce energy consumption, then thermal comfort improves, but building complexity and cost increase
Solution Approach 1:
The patent implements a self-regulating thermal system where the geopolymer concrete's inherent thermal mass automatically absorbs and releases heat based on temperature differentials. The phase change materials passively absorb excess heat during the day and release it at night without requiring active control systems, reducing both energy consumption and system complexity
Solution Approach 2:
The geopolymer concrete wythes serve multiple functions simultaneously: structural support, thermal mass for temperature regulation, and substrate for the insulation layer. This multi-functionality reduces overall building system complexity compared to separate structural and thermal control systems
3Temperature
If thermal mass is increased to flatten temperature fluctuations, then thermal comfort stabilizes, but construction time and material quantity increase
Solution Approach 1:
The patent divides the wall assembly into separate precast segments (outer wythe, insulation layer, inner wythe) that can be manufactured independently and assembled quickly on-site. This segmentation maintains the thermal mass benefit while dramatically improving construction productivity through modular precasting
Solution Approach 2:
The wall components are precast in controlled factory environments where thermal mass properties can be optimized in advance. The geopolymer concrete is pre-cured with controlled moisture and temperature conditions, allowing the thermal mass to be prepared beforehand rather than requiring extended on-site construction time
4Productivity
If precast concrete construction is used to improve constructability and durability, then construction efficiency increases, but greenhouse gas emissions from cement production increase
Solution Approach 1:
The patent changes the binder composition parameter from Portland cement to geopolymer binder, maintaining the precast construction process and its productivity benefits while eliminating the high CO2 emissions associated with cement production. The geopolymer chemistry enables the same rapid setting and curing characteristics needed for efficient precasting
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 design effectively reduces energy consumption for heating and cooling, provides consistent thermal comfort, and minimizes carbon emissions by utilizing geopolymer concrete and a capillary tube system for on-demand heating and cooling, while maintaining structural integrity.
Implementation Method 1
a rigid insulation layer having an interior surface and an exterior surface
Implementation Method 2
a capillary tube system located within the construction panel wherein liquid is passed through the tubing in order to increase or decrease the temperature of the construction panel
Implementation Method 3
Another factor which affects a structure's carbon footprint is its thermal mass. In building design, thermal mass is a property of the mass of a building which enables it to store heat
Data Source
AI summary
A construction panel comprising a rigid insulation layer having an interior surface and an exterior surface, an outer concrete wythe secured to the exterior surface of the insulation layer, an inner concrete wythe secured to the interior surface of the insulation layer, a grid system which ties the outer concrete wythe to the inner concrete wythe and a capillary tube system located within the construction panel wherein liquid is passed through the tubing in order to increase or decrease the temperature of the construction panel.