Heat storage material composition, and heat storage system for heating and cooling building
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Solution Overview
Problem
Conventional heat storage material compositions for building heating and cooling systems fail to achieve a 5° C. range lower-limit temperature between 15° C. and 20° C. while maintaining a high 5° C. range latent heat of melting of 140 J/g or more, which is essential for efficient heat storage and utilization.
Innovation Solution
A heat storage material composition comprising calcium chloride hexahydrate, ammonium bromide, and potassium bromide, with specific mass percentage ranges, along with optional phase separation inhibitors, melting point depressants, and supercooling inhibitors, to achieve the desired temperature range and latent heat values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional heat storage material compositions are used, then the material can store heat, but the 5° C. range latent heat of melting is insufficient (less than 140 J/g) or the temperature range is not optimal (not between 15° C. and 20° C.)
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios of calcium chloride hexahydrate, ammonium bromide, and potassium bromide to achieve the optimal temperature range and latent heat values. By adjusting the mass percentages of these components, the melting characteristics and heat storage capacity are optimized to meet the specified requirements of 15-20°C temperature range and 140 J/g or more latent heat.
Solution Approach 2:
The patent employs composite materials by combining three different substances (calcium chloride hexahydrate, ammonium bromide, and potassium bromide) in specific proportions. This composite approach allows the heat storage material to achieve properties that cannot be obtained with a single component, specifically optimizing both the temperature range and the 5° C. range latent heat of melting to exceed 140 J/g.
2Temperature
If the amount of additives (ammonium bromide and potassium bromide) is increased to adjust temperature, then the temperature range can be modified, but the total latent heat of melting decreases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing specific mass percentage ranges for each component. By carefully controlling the amounts of ammonium bromide (2.7-12.3 mass %) and potassium bromide (1.8-14.4 mass %) relative to calcium chloride hexahydrate, the patent achieves the optimal temperature range while maintaining the 5° C. range latent heat of melting at 140 J/g or more, preventing the latent heat from decreasing.
3Productivity
If a narrow temperature range is targeted for heat absorption and radiation, then heat storage efficiency improves, but it becomes difficult to achieve both the desired temperature range and high latent heat simultaneously
Solution Approach 1:
The patent applies parameter changes by optimizing the composition to achieve a narrow 5° C. temperature range with high latent heat content. The specific formulation ensures that the material absorbs and releases heat efficiently within a tight temperature window (15-20°C) while maintaining a 5° C. range latent heat of melting of 140 J/g or more, thus improving heat storage efficiency without sacrificing latent heat.
Solution Approach 2:
The patent uses composite materials to simultaneously achieve narrow temperature range and high latent heat. The combination of calcium chloride hexahydrate with specific amounts of ammonium bromide and potassium bromide creates a material system where the phase change occurs over a narrow 5° C. range while accumulating sufficient latent heat energy density of 140 J/g or more.
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 composition effectively stores and releases heat within the optimal temperature range, enhancing the efficiency of building heating and cooling systems by ensuring a high 5° C. range latent heat of melting of 140 J/g or more, thus reducing energy loads.
Implementation Method 1
Latent heat storage material compositions that utilize the latent heat generated or absorbed during the phase change from liquid to solid or from solid to liquid have been known
Implementation Method 2
the phase change from liquid to solid or from solid to liquid
Data Source
AI summary
A heat storage material composition includes a main agent composed of a calcium chloride hexahydrate, an ammonium bromide, and a potassium bromide, wherein a 5° C. range lower-limit temperature T5L is in a range of 15° C. or more to less than 20° C., and a 5° C. range latent heat of melting H5 is 140 J/g or more. Preferably, the heat storage material composition includes 79 to 90.9 mass % of the calcium chloride hexahydrate, 2.7 to 12.3 mass % of the ammonium bromide, and 1.8 to 14.4 mass % of the potassium bromide in 100 mass % of the main agent.