Systems and methods for regenerative ejector-based cooling cycles
View Patent ↗Systems and methods for regenerative ejector-based cooling cycles that utilize an ejector as the motivating force in a cooling loop to regeneratively sub-cool a refrigerant in a single-stage cooling cycle.
1 . A system for use with a refrigerant in a regenerative cooling cycle, which comprises:
an ejector for mixing a condensed liquid form of the refrigerant and a first vaporized form of the refrigerant to form a two-phase form of the refrigerant;
a flash economizer in fluid communication with the ejector for separating the two-phase form of the refrigerant from the ejector into a second vaporized form of the refrigerant and a liquid form of the refrigerant;
a sub-cooler connected to the ejector by a vaporized refrigerant line for cooling a portion of the liquid form of the refrigerant from a liquid refrigerant line fluidly connected to the flash economizer and vaporizing another two-phase form of the refrigerant; and
an evaporator in fluid communication with the sub-cooler for heating a separate sub-cooled liquid form of the refrigerant by transferring heat from an external source to the separate sub-cooled liquid form of the refrigerant and producing a third vaporized form of the refrigerant, wherein the flash economizer is connected to the evaporator for receiving the third vaporized form of the refrigerant.
2 . The system of claim 1 , further comprising a pump positioned between the flash economizer and the sub-cooler for distributing the liquid form of the refrigerant.
3 . The system of claim 1 , further comprising a compressor connected to the flash economizer for compressing the second vaporized form of the refrigerant.
4 . The system of claim 1 , further comprising a pump positioned upstream from the ejector for increasing at least one of a discharge pressure at the ejector and an intermediate pressure at the flash economizer.
5 . The system of claim 1 , wherein a temperature and a pressure for the second vaporized form of the refrigerant are substantially 72° F. and substantially 89 psia, respectively.
6 . The system of claim 1 , wherein a temperature and a pressure for the liquid form of the refrigerant are substantially 95° F. and substantially 129 psia, respectively.
7 . The system of claim 1 , wherein a temperature and a pressure for the sub-cooled liquid form of the refrigerant are substantially 68° F. and substantially 88 psia, respectively.
8 . The system of claim 1 , wherein a temperature and a pressure for the two-phase form of the refrigerant are substantially 72° F. and substantially 89 psia, respectively.
9 . A regenerative cooling method, which comprises:
mixing a condensed liquid form of a refrigerant and a first vaporized form of the refrigerant to form a two-phase form of the refrigerant;
separating the two-phase form of the refrigerant and a third vaporized form of the refrigerant into a second vaporized form of the refrigerant and a liquid form of the refrigerant;
cooling a first portion of the liquid form of the refrigerant by transferring heat from the first portion of the liquid form of the refrigerant to another two-phase form of the refrigerant and producing the first vaporized form of the refrigerant and a separate sub-cooled liquid form of the refrigerant; and
heating the separate sub-cooled liquid form of the refrigerant by transferring heat from an external source to the sub-cooled liquid form of the refrigerant and producing the third vaporized form of the refrigerant.
10 . The method of claim 9 , further comprising compressing the second vaporized form of the refrigerant.
11 . The method of claim 9 , further comprising increasing at least one of a discharge pressure at an ejector and an intermediate pressure at a flash economizer with a pump.
12 . The method of claim 9 , wherein a temperature and a pressure for the second vaporized form of the refrigerant are substantially 72° F. and substantially 89 psia, respectively.
13 . The method of claim 9 , wherein a temperature and a pressure for the liquid form of the refrigerant are substantially 95° F. and substantially 129 psia, respectively.
14 . The method of claim 9 , wherein a temperature and a pressure for the separate sub-cooled liquid form of the refrigerant are substantially 68° F. and substantially 88 psia, respectively.
15 . The method of claim 9 , wherein a temperature and a pressure for the two-phase form of the refrigerant are substantially 72° F. and substantially 89 psia, respectively.
16 . The method of claim 9 , wherein a temperature and a pressure for the first vaporized form of the refrigerant are substantially 60° F. and substantially 72 psia, respectively.
17 . The method of claim 9 , wherein the refrigerant is a refrigerant with a cooling duty of 5.4 MW for cooling a circulating cooling water system from substantially 86° F. to substantially 72° F.