『8. Absorption refrigerator: cooling with fire, water, and salt』のカバーアート

8. Absorption refrigerator: cooling with fire, water, and salt

8. Absorption refrigerator: cooling with fire, water, and salt

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概要
 This week we’re talking about Eric’s recent video on his absorption refrigerator design that uses water as the refrigerant and calcium chloride (road salt) to absorb the vapor, powered by heat instead of a compressor. We’re going through how the cycle works, the main components, the practical limits, and what it takes to keep the system running.Full Youtube video on fire-powered refrigeration: https://youtu.be/3sv7TBtHcgo?si=qB2NBwEFFEgI2xlkIn this episode:How an absorption refrigerator cycles water as the refrigerant with calcium chloride as the absorbentWhy calcium chloride is used instead of regular salt or other common absorbents like lithium bromideThe roles of the generator, absorber, condenser, expansion valve, and evaporatorHow vacuum lowers the boiling point to produce cooling and why the system stays below ambient pressureTemperature limits of water as a refrigerant and why making ice is difficultHow the U-bend and pressure differences create directional flow without a compressorPractical considerations for off-grid use, including supplementing a root cellar and managing heat inputPower needs for pumps and fans, and options for using solar heat on the generatorChallenges with scaling evaporators, absorber capacity, and monitoring pressures and temperaturesStructural and vacuum-related details that affect building and operating the system_______________________________Welcome to the Greenhill Forge Podcast, with Eric from the Greenhill Forge YouTube channel, and my buddy Amal, a fellow builder of many trades.In this podcast we’ll talk about where the real world meets experiments in alternative energy, wood heating, metal fabrication, off-grid engineering and self sufficiency, so expect discussions about workshops, tools, fabrication, building, homesteading, and what it actually takes to make those dreams real.We’ll answer a question each week, so send yours to us at https://forms.gle/zNzKTtjDnBEupLBQAWATCH the podcast on Youtube at https://www.youtube.com/@GreenhillPodLISTEN on all your favorite podcast platforms.See you next week!_______________________________CHAPTERS00:00:04 Absorption refrigerator design overview00:01:05 Importance of cooling and off-grid power sources00:02:36 Choosing water and calcium chloride over other options00:03:05 How calcium chloride absorbs water vapor in a closed system00:05:26 Exothermic reaction when calcium chloride hydrates00:06:30 Calcium chloride as road salt and a concrete accelerator00:07:47 Water as the refrigerant and the absorber’s role00:08:08 Cooling the absorber to maintain absorption capacity00:09:26 Multiple heat cycles compared with vapor compression00:10:23 Expansion valve, pressure drop, and one-time coolers00:11:48 Generator and absorber replacing the compressor00:13:09 Lifting refrigerant with heat and gravity feed00:13:41 Water’s heat capacity advantages and drawbacks as a refrigerant00:14:08 Latent heat and phase change explained00:15:46 Boiling point changes with pressure and elevation00:16:54 Using vacuum to lower the boiling point for cooling00:17:58 Freezing limitations of water as a refrigerant00:19:03 Using the system to supplement a root cellar00:19:43 Achievable evaporator temperatures and ice-making challenges00:20:24 Issues with antifreeze additives in the system00:21:47 Flow through the condenser, needle valve, and evaporator00:22:05 U-bend as a check valve and pressure separation00:22:57 Running the generator leg with the valve closed00:24:18 Split of flow between the evaporator and recirculation00:27:34 Design process and differences from industrial systems00:28:00 Sizing the U-bend for the pressure differential00:29:07 Ambient temperature effects on evaporator performance00:30:35 Enclosing the evaporator and accounting for fan heat00:31:45 Adding evaporators in parallel and absorber capacity00:33:29 Limited published data on calcium chloride as an absorbent00:36:22 Off-grid challenges with compressors and mechanical energy00:37:13 Power draw and solar options for heat and pumps00:39:00 Solar heating the generator and thermal storage ideas00:41:11 Solar irradiance and concentrating sunlight00:42:45 Solar panel efficiency versus direct heat collection00:43:30 Using solar-heated fluid to drive the generator00:44:37 Potential cooling capacity for small units00:45:57 Sensors, Arduino modules, and voltage readings00:48:26 Pressure sensors, absolute versus gauge pressure00:50:07 System pressures remaining below ambient00:51:15 Structural deflection and reinforcement under vacuum00:52:58 Vacuum distillation and related applications00:56:35 Water level shifts between generator and absorber01:00:06 Water column acting as a barometer
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