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12.3.2.5 Thermoelastic: Development status: R&D The technology uses Shape Memory Alloys (SMA), which are alloys such as nickel titanium alloys (NiTi) which when mechanically stressed will go into a solid-to-solid phase transformation and reject heat. The phenomena are reversible and SMA absorb heat as they return to their original shape. Plans are underway to develop a window air conditioner in the near future. A car air conditioning prototype based on thermoelastic technology is also planned (ARPA, 2013c; MEST, 2013). This promising technology is in its early stages of research and development. It has a projected COP of 6 compared to a COP of 3 for MVC. 12.3.3 Thermal based technologies. 12.3.3.1 Absorption heat pump: Development status: widely commercially available Available refrigeration capacity of absorption units is shown in the figure below. The figure shows both lithium bromide- water and water- Ammonia units of various denominations. It is important to note that the COP of an absorption chiller is a heat ratio and cannot be compared directly with that of a vapour compression chiller; because the latter is a ratio of useful refrigeration effect divided by the work of an electric motor-driven compressor, a different more refined form of energy. 2018 TOC Refrigeration, A/C and Heat Pumps Assessment Report 241PDF Image | Heat Pumps Technical Options
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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