CO2 cooling and heating apparatus and method having multiple refrigerating cycle circuits
US7818971B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 17, 2008 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | Apr 15, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2400/13
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A CO2 cooling and heating apparatus and method permit simultaneous production of high-temperature heat source and low-temperature heat source having a temperature difference therebetween. The apparatus/method uses CO2 (carbon dioxide) as a refrigerant, and has a first refrigerating cycle circuit where the refrigerant is compressed to a supercritical zone and then decompressed via an expansion device to a pressure/temperature level of the CO2 triple point or below to thereby attain evaporation. The apparatus can include multistage compressors, intermediate cooler disposed in a first refrigerant flow path between a condenser and the expansion device. A second refrigerating cycle circuit having a second refrigerant flow path, which can branch off from the first refrigerant flow path or provided in an independent closed circuit, can be provided to carry out absorption of evaporation latent heat with the first refrigerant flow path to thereby maintain the pressure/temperature level of the CO2 triple point (Ptr) or above. A third refrigerating cycle circuit having a third refrigerant flow path also can be provided to carry out heat exchange with the second refrigerant flow path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.