An indoor lighting and climate system includes a plurality of lighting units arranged in a dispersed manner in a room and a control unit arranged to control the operation of the lighting units in relation to preset climate settings and input signals from at least one temperature sensor, wherein each of said lighting units include a cup shaped housing with an opening, a lamp attachment fora lamp, an open inside space between said lamp and said cup shaped housing, and a fan arranged to produce a forced air flow in said space, characterized in that a circumferentially extending inner dividing wall member is arranged within said cup shaped housing, which circumferentially extending dividing wall separates said open inside space from a heat flow channel arranged within said cup shaped housing.

An energy supply system for salt lake lithium extraction comprises: a lithium extraction unit, a water source supply unit, a heating unit, a heat exchange unit, a steam supply unit, and a lithium extraction plant. The water source supply unit comprises a water storage tank and a first solid heat storage assembly. A second solid heat storage assembly of the heating unit is connected to the heat exchange unit, and is connected to the lithium extraction plant by means of a building heating water supply pipeline. The lithium extraction unit comprises an adsorption assembly, a membrane assembly, an evaporation assembly and a lithium precipitation assembly, and the water storage tank is connected to the adsorption assembly. A third solid heat storage assembly of the steam supply unit is connected to the evaporation assembly and the lithium precipitation assembly. The lithium extraction plant is connected to the heat exchange unit.

A method for supplying CO.sub.2 gas to a site comprising a facility (20) that requires CO.sub.2 or a mixture comprising CO.sub.2, such as an abattoir or a greenhouse for cultivating plants, comprises the following steps: a boiler (4) capable of supplying hot water to the site is arranged within the site, the boiler carrying out the process of oxycombustion between a fuel (14) and pure oxygen (1), the oxygen that supplies the boiler being obtained from a liquid oxygen source present on the site; and some or all of the CO.sub.2 contained in the flue gas produced by the boiler is recovered by transferring heat between the flue gas and the liquid oxygen in an exchanger (2).