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US 9,791,189 B2Granted
Heat exchanger and refrigeration cycle apparatus
AssigneeMitsubishi Electric Corporation
InventorsShigeyoshi Matsui, Takuya Matsuda, Keisuke Hokazono, Hiroki Okazawa, Takashi Okazaki, Akira Ishibashi, Atsushi Mochizuki
Life of this patent
Estimating the term…
Abstract
A heat exchanger is configured such that flat tubes in at least two levels bent or connected to each other at one end in an axial direction of the flat tubes and the flat tubes in at least two columns connected to each other are included in refrigerant passages through which refrigerant flows, and a flow direction of gas is counter to flow of refrigerant through the refrigerant passages in a column direction while the heat exchanger serves as a condenser.
Claims12
A heat exchanger comprising:
- a plurality of fins spaced apart from one another such that gas flows through spaces defined by the fins;
- and
- a plurality of flat tubes through which refrigerant flows to exchange heat with the gas, the flat tubes extending through the fins,
- the flat tubes being arranged in multiple levels in a level direction orthogonal to a flow direction of the gas and being arranged in multiple columns in a column direction being along the flow direction of the gas, the flat tubes forming refrigerant passages through which the refrigerant flows, by
- having a bend connecting at least two levels of the flat tubes at one end in an axial direction of the flat tubes, or a connection connecting at least two levels of the flat tubes to each other at the one end in the axial direction of the flat tubes, and
- being connected to each other in at least two columns,
- wherein a number of the refrigerant passages, a number of levels of the flat tubes, a hydraulic diameter per subpassage in each of the flat tubes, a number of subpassages in each of the flat tubes, a stack length of each of the flat tubes, and a number of columns of the flat tubes satisfy a relationship given by Expression (1):
- 2
- ≤
- D
- n
- /
- N
- p
- ≤
- K
- ·
- De
- 5
- ×
- (
- N
- p
- ×
- n
- )
- 2
- L
- ×
- N
- r
- (
- 1
- )
- where
- Dn is the number of levels of the flat tubes,
- Np is the number of the refrigerant passages,
- K is a constant determined by an upper limit pressure loss of the refrigerant in each of the refrigerant passages while the heat exchanger serves as an evaporator,
- De is the hydraulic diameter per subpassage in each of the flat tubes,
- n is the number of subpassages in each of the flat tubes,
- L is a stack length of each of the flat tubes, and
- Nr is the number of columns of the flat tubes.
39 more elements
A heat exchanger comprising:
- a plurality of fins spaced apart from one another such that gas flows through spaces defined by the fins;
- and
- a plurality of flat tubes through which refrigerant flows to exchange heat with the gas, the flat tubes extending through the fins,
- the flat tubes being arranged in multiple levels in a level direction orthogonal to a flow direction of the gas and being arranged in multiple columns in a column direction being along the flow direction of the gas, the flat tubes forming refrigerant passages, and the refrigerant passages being arranged in at least two columns and being connected to each other, each refrigerant passage containing
- a bend connecting at least two levels of the flat tubes at one end in an axial direction of the flat tubes, or a connection connecting at least two levels of the flat tubes to each other at the one end in the axial direction of the flat tubes, and
- a plurality of subpassages through which the refrigerant flows,
- wherein a number of refrigerant passages provided by the flat tubes, a number of levels of the flat tubes, a hydraulic diameter of the subpassages in the flat tubes, a number of subpassages in each of the flat tubes, a stack length of each of the flat tubes, and a number of columns of the flat tubes satisfy a relationship given by Expression (1):
- 2
- ≤
- D
- n
- /
- N
- p
- ≤
- K
- ·
- D
- e
- 5
- ×
- (
- N
- p
- ×
- n
- )
- 2
- L
- ×
- N
- r
- (
- 1
- )
- where
- Dn is the number of levels of the flat tubes,
- Np number of the refrigerant passages provided by the flat tubes,
- K is a constant determined by an upper limit pressure loss of the refrigerant in each of the refrigerant passages while the heat exchanger serves as an evaporator,
- De is the hydraulic diameter of the subpassages in the flat tubes,
- n is the number of subpassages in each of the flat tubes,
- L is a stack length of each of the flat tubes, and
- Nr is the number of columns of the flat tubes.
40 more elements
Dependencies are inferred from the claim text.