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DX system being drilled in the 1980s. A direct exchange (DX) geothermal heat pump is a type of ground source heat pump in which refrigerant circulates through copper tubing placed in the ground unlike other ground source heat pumps where refrigerant is restricted to the heat pump itself with a secondary loop in the ground filled with a mixture of water and anti-freeze.
Hang Seng China-Affiliated Corporations Index or HSCCI is a stock index of the Stock Exchange of Hong Kong for red chip companies listed on the exchange, which are incorporated outside of mainland China, such as in Bermuda, the Cayman Islands, or Hong Kong, but are majority-owned by the central or regional government of the People's Republic of China.
Hang Seng China Enterprises Index is a stock market index of The Stock Exchange of Hong Kong for H share, red chip, and P chip.. H share is a class of ordinary share of the mainland China incorporated company that only traded outside the mainland China; all of these companies were majority owned by the central or regional Chinese government.
This page was last edited on 4 September 2020, at 01:14 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
The direct exchange geothermal heat pump (DX) is the oldest type of geothermal heat pump technology where the refrigerant itself is passed through the ground loop. Developed during the 1980s, this approach faced issues with the refrigerant and oil management system, especially after the ban of CFC refrigerants in 1989 and DX systems now are ...
This page was last edited on 6 February 2017, at 12:53 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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