HEAT EXCHANGER AND AIR CONDITIONER - MITSUBISHI ELECTRIC CORP

Title:

HEAT EXCHANGER AND AIR CONDITIONER

Document Type and Number:

WIPO Patent Application WO/2021/234955

Kind Code:

A1

Abstract:

A heat exchanger wherein: Formula (1) is satisfied where N1 and N2 are the numbers of main heat exchanger tubes and secondary heat exchanger tubes; Formula (2) and Formula (3) are satisfied where Ta1 and Ta2 are the channel cross-sectional areas of one main heat exchanger tube and one secondary heat exchanger tube, Ha1 is the cross-sectional area of a main first header per one main heat exchanger tube, and Ha2 is the cross-sectional area of a secondary first header per one secondary heat exchanger tube; and Formula (4) and Formula (5) are satisfied where AT1 is the sum of the channel cross-sectional areas of the main heat exchanger tubes, AT2 is the sum of the channel cross-sectional areas of the secondary heat exchanger tubes, Gr1 and Gr2 are the flow rates [kG/h] of all refrigerants circulating through a main heat exchanger and a secondary heat exchanger, G is the gravitational acceleration [m/s2], D1 and D2 are the equivalent diameters [m] of the cross-sections of one channel of the main heat exchanger tube and one channel of the secondary heat exchanger tube, ρL1 and ρL2 are the densities [kG/m3] of the liquid refrigerant flowing through the main heat exchanger tube and the secondary heat exchanger tube, ρG1 and ρG2 are the densities [kG/m3] of the gas refrigerant flowing through the main heat exchanger tube and the secondary heat exchanger tube, and X1 and X2 are the dryness [-] of the refrigerant in the main heat exchanger and the secondary heat exchanger, respectively.　(1): 0.1 < N2/(N1 + N2) < 0.4. (2): 0.03 < Ta1/Ha1 < 0.3. (3): 0.03 < Ta2/Ha2 < 0.3. (4): AT1 < Gr1/(G × D1(ρL1-ρG1))(1/2) × (X1(1/2) × ρG1(-1/4) + (1-X1)(1/2) × ρL1(-1/4))2. (5): AT2 < Gr2/(G × D2(ρL2-ρG2))(1/2) × (X2(1/2) × ρG2(-1/4) + (1-X2)(1/2) × ρL2(-1/4))2.

Inventors:

NAKAO YUKI (JP)
SAIKUSA TETSUJI (JP)
ADACHI RIHITO (JP)

Application Number:

PCT/JP2020/020348

Publication Date:

November 25, 2021

Filing Date:

May 22, 2020

Export Citation:

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Assignee:

MITSUBISHI ELECTRIC CORP (JP)

International Classes:

F25B39/00; F28D1/04; F28F9/02

Domestic Patent References:

WO2018047332A1	2018-03-15
WO2015125743A1	2015-08-27

Foreign References:

JP2017116152A	2017-06-29
JP4686062B2	2011-05-18
JP4686062B2	2011-05-18

Other References: