US5655378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trans-critical vapor compression device
Assignee: Sinvent AS
•
Filing: 1993-12-08
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Granted: 1997-08-12
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Expires: 2013-12-08
Abstract
Abstract A vapor compression system includes a compressor, a heat rejecting heat exchanger, an expansion device and an evaporator connected in series to form a closed circuit operating at supercritical pressure in a high pressure side of the circuit. A large part of the internal volume of the circuit is incorporated at or close to a refrigerant outlet from the heat exchanger. The actual refrigerant charge corresponds to an optimum overall density ensuring self-adaptation of the supercritical high-side pressure to maintain maximum energy efficiency at varying heat rejection temperatures of the heat exchanger.
Inventors
- 👤 Jostein Pettersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:42
CPC Classifications
F; F25; F25B; F25B45/00; F25B1/00; F25B9/00; F25B9/002; F25B9/008; F25B2309/00; F25B2309/06; F25B2309/061; F25B2400/00; F25B2400/16; F25B2600/00; F25B2600/17
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
A vapour compression system comprising: a compressor, a heat rejecting heat exchanger, an expansion means, and an evaporator connected in series forming a closed circuit, operating at supercritical pressure in a high pressure side of said circuit, an internal volume of said high pressure side of said closed circuit representing at least 70% of a total internal volume of said closed circuit.
Claim 2
Dependent Claim
62 words
A vapour compression system comprising: a compressor, a heat rejecting heat exchanger, an expansion means, and an evaporator connected in series forming a closed circuit, operating at supercritical pressure in a high pressure side of said circuit, an internal volume of said high pressure side of said closed circuit representing at least 70% of a total internal volume of said closed circuit.
Claim 3
Dependent Claim
42 words
A system as claimed in claim 1, having carbon dioxide as a refrigerant, and wherein a charge of said refrigerant in said closed circuit amounts to from 0.55 to 0.70 kg per liter of said total internal volume of said closed circuit.
Claim 4
Dependent Claim
31 words
A system as claimed in claim 2, wherein said heat rejecting heat exchanger has a substantial share of an internal volume thereof located at or close to a refrigerant outlet thereof.
Claim 5
Dependent Claim
31 words
A system as claimed in claim 2, wherein an extra volume is incorporated in or connected to said closed circuit at or close to a refrigerant outlet from said heat exchanger.
Claim 6
Dependent Claim
31 words
A system as claimed in claim 1, further comprising a separate pressure relieving and leakage compensating expansion vessel connected via a valve to a low pressure side of said closed circuit.
Claim 7
Dependent Claim
31 words
A system as claimed in claim 1, wherein said heat rejecting heat exchanger has a substantial share of an internal volume thereof located at or close to a refrigerant outlet thereof.
Claim 8
Dependent Claim
31 words
A system as claimed in claim 1, wherein an extra volume is incorporated in or connected to said closed circuit at or close to a refrigerant outlet from said heat exchanger.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-08-11 | 2001-02-10 | 2001-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-11 | 2005-02-10 | 2005-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-11 | 2009-02-10 | 2009-08-12 | $7700.00 | Window Closed / Lapsed |