Absorption heat pump
[citation needed] AHPs are more complex and require larger units compared to compression heat pumps.
[4] When they are applied in industry, the absorption heat pumps should be properly placed in terms of energy and they must satisfy the limitations of special features of the surroundings.
The coefficient of performance of the first type absorption heat pump is greater than 1, generally 1.5 to 2.5.
[9] The type 2 absorption heat pump could be driven by low-grade waste heat in the production process or in nature, which can achieve energy saving and emission reduction and reduce production costs, and it has practical application in petrochemical and coal chemical industries.
When the generator is supplied with heat, the temperature of the mixture rises, thereby increase the concentration of high-boiling components (absorbent) and release the refrigerant.
[1] Water and LiBr systems have bigger capacities and are applied in a broad range in the industry, the sizes vary from tens of kW to several MW.
In the evaporator and condenser, the phase change of pure ammonia is used to complete the external absorption or heat release.
[11] Single, double, or triple iterative absorption cooling cycles are used in different solar-thermal-cooling system designs.
[citation needed] In the late 19th century, the most common phase change refrigerant material for absorption cooling was a solution of ammonia and water.
Common, inexpensive flat-plate solar thermal collectors only produce about 70 °C (160 °F) water, but several successful commercial projects in the US, Asia and Europe have shown that flat plate solar collectors specially developed for temperatures over 93 °C (200 °F) (featuring double glazing, increased backside insulation, etc.)
[15] Mathematical models are available in the public domain for ice-based thermal energy storage performance calculations.
Reasonable use of corresponding heat pump technology can achieve the efficient and comprehensive utilization of geothermal resources at different temperature levels, greatly reducing energy consumption for heating and cooling of residential and commercial buildings.
[4] For low-temperature heat sources of 15–25 °C, driven by a small amount of high-temperature heat sources (such as high-temperature steam or direct combustion), cold water at a temperature of 7–15 °C and hot water at a temperature above 47 °C can be prepared.
It is possible that only one device can provide resources to the urban area in a resource-efficient manner throughout most of the year driven by waste heat.
