Supercritical refrigerating cycle system
US6182456A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 7, 1999 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Apr 7, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/70
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A CO.sub.2 cycle system having a variable capacity compressor is controlled even when the refrigerant delivery capacity of the variable capacity compressor changes. When the refrigerant delivery capacity of the variable capacity compressor decreases, the aperture of an electric expansion valve is fixed for a predetermined time To. When the refrigerant delivery capacity has not changed, the aperture of the electric expansion valve is controlled so that the refrigerant temperature and pressure on the outlet side of a system heat exchanger change along an optimal control line. As a result, because the refrigerant delivery capacity Qd of the compressor is controlled in correspondence with the intake pressure Ps, i.e., the pressure on the side of the evaporator, without being influenced by control of the expansion valve side, the CO.sub.2 cycle system can be adequately controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.