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2. Dilution refrigerator - Wikipedia

   en.wikipedia.org/wiki/Dilution_refrigerator

   A 3 He/ 4 He dilution refrigerator is a cryogenic device that provides continuous cooling to temperatures as low as 2 mK, with no moving parts in the low-temperature region. [ 1 ] [ 2 ] The cooling power is provided by the heat of mixing of the helium-3 and helium-4 isotopes.

3. Pulse tube refrigerator - Wikipedia

   en.wikipedia.org/wiki/Pulse_tube_refrigerator

   The pulse tube refrigerator (PTR) or pulse tube cryocooler is a developing technology that emerged largely in the early 1980s with a series of other innovations in the broader field of thermoacoustics.

4. Refrigerator - Wikipedia

   en.wikipedia.org/wiki/Refrigerator

   Commercial refrigerator and freezer units were in use for almost 40 years prior to the common home models. The freezer-over-refrigerator style had been the basic style since the 1940s, until modern, side-by-side refrigerators broke the trend. A vapor compression cycle is used in most household refrigerators, refrigerator–freezers and freezers.

5. Heat pump - Wikipedia

   en.wikipedia.org/wiki/Heat_pump

   2.4: 2.2 1.9 ‐ ‐ ‐ High-efficiency ASHP, air at 0 °C [56] Low output temperature 3.8: 2.8 2.2 2.0 ‐ ‐ Prototype transcritical CO 2 (R744) heat pump with tripartite gas cooler, source at 0 °C [58] High output temperature 3.3 ‐ ‐ 4.2 ‐ 3.0 Ground-source heat pump (GSHP), water at 0 °C [56] 5.0 3.7 2.9 2.4 ‐ ‐ GSHP, ground ...

6. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space.

7. Please Take Care of My Refrigerator - Wikipedia

   en.wikipedia.org/wiki/Please_Take_Care_of_My...

   The two competing chefs have 15 minutes to cook a dish using ingredients from the guest's refrigerator. Some basic ingredients, like onions, are provided by the show. A host (Kim Sung-joo or Ahn Jung-hwan) will then sample the dishes in the middle of the cooking process and comment on their quality.