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US4911232A
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US
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Method of using a PCM slurry to enhance heat transfer in liquids
Assignee: Triangle Research and Development Corp
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Filing: 1989-04-27
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Granted: 1990-03-27
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Expires: 2009-04-27
Abstract
Abstract A method of obtaining enhanced heat transfer in a closed loop thermodynamic system is disclosed. A two-component heat transfer fluid comprising a carrier fluid and a plurality of discrete reversible latent energy transition material particles. The fluid slurry is circulated about the loop and the loop is tuned so that a minimum temperature differential exists between the thermal source and sink in order to maximize the latent heat transport by adjustment of the heat transfer fluid flow rate, the rate of thermal energy input into the heat transfer fluid and the rate of cooling of heat transfer fluid.
Inventors
- 👤 David P. Colvin
- 👤 James C. Mulligan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:06
CPC Classifications
F; F28; F28D; F28D20/00; F28D20/02; F28D20/023; F28D19/00; Y; Y02; Y02E; Y02E60/00; Y02E60/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
187 words
A method of obtaining enhanced thermal energy transfer between a thermal energy source and a thermal energy sink in a closed loop thermodynamic system comprising the steps of: (a) circulating a two component heat transfer fluid in a close proximity to the thermal energy source, the heat transfer fluid including a carrier fluid and a plurality of discrete particles that undergo a reversible latent energy transition upon transfer of thermal energy to the fluid so that thermal energy is transferred thereto; (b) circulating the heat transfer fluid in proximity to a thermal energy sink so that thermal energy is removed therefrom; (c) tuning the closed loop thermodynamic system to a minimum change in temperature between the thermal energy source and the thermal energy sink in order to maximize the latent heat transport by adjusting the heat transfer fluid flow ate, the rate of thermal energy input into the heat transfer fluid, and rate of cooling of the heat transfer fluid, whereby the ability of the heat transfer fluid to absorb and transfer thermal energy is enhanced and the pumping power required to circulate the fluid is reduced.
Claim 2
Independent Claim
187 words
A method of obtaining enhanced thermal energy transfer between a thermal energy source and a thermal energy sink in a closed loop thermodynamic system comprising the steps of: (a) circulating a two component heat transfer fluid in a close proximity to the thermal energy source, the heat transfer fluid including a carrier fluid and a plurality of discrete particles that undergo a reversible latent energy transition upon transfer of thermal energy to the fluid so that thermal energy is transferred thereto; (b) circulating the heat transfer fluid in proximity to a thermal energy sink so that thermal energy is removed therefrom; (c) tuning the closed loop thermodynamic system to a minimum change in temperature between the thermal energy source and the thermal energy sink in order to maximize the latent heat transport by adjusting the heat transfer fluid flow ate, the rate of thermal energy input into the heat transfer fluid, and rate of cooling of the heat transfer fluid, whereby the ability of the heat transfer fluid to absorb and transfer thermal energy is enhanced and the pumping power required to circulate the fluid is reduced.
Claim 3
Dependent Claim
16 words
The method according to claim 1 wherein the discrete particles comprise a microencapsulated phase change material.
Claim 4
Dependent Claim
19 words
The method according to claim 1 wherein the discrete particles comprise a material that undergoes a solid/solid phase transformation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |