CN103900292A - Hybrid tube falling-film evaporator - Google Patents
Hybrid tube falling-film evaporator Download PDFInfo
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- CN103900292A CN103900292A CN201210579499.7A CN201210579499A CN103900292A CN 103900292 A CN103900292 A CN 103900292A CN 201210579499 A CN201210579499 A CN 201210579499A CN 103900292 A CN103900292 A CN 103900292A
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- heat exchange
- tubes
- nest
- film evaporator
- heat exchanging
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Abstract
The invention discloses a hybrid tube falling-film evaporator comprising a shell. A refrigerant distributor is arranged on the upper portion in the shell. A heat exchanging tube group is horizontally arranged below the refrigerant distributor and includes a top heat exchanging tube group and a bottom heat exchanging tube group. The diameters of the bottom heat exchanging tube group are smaller than those of the top heat exchanging tube group. The hybrid tube falling-film evaporator has the advantages that injecting quantity of the the refrigerant is reduced while the heat exchanging coefficient is maintained instead of being decreased; the hybrid tube falling-film evaporator is simple and compact in structure and has fine process performance.
Description
Technical field
The present invention relates to a kind of evaporimeter, refer to particularly a kind of mixing tube downward film evaporator.
Background technology
Downward film evaporator compared with traditional flooded type evaporimeter, has evaporation intensity large as a kind of efficient evaporation equipment, the elevation of boiling point causing without hydrostatic head, the advantage such as heat exchange efficiency is high, and equipment volume is little.The operation principle of downward film evaporator is that the refrigerant medium of coming from condenser enters after distributor, from distributor, flows out, and drips and drenches on heat exchanger tube, makes the heat transfer medium in heat exchanger tube obtain cold, is transferred to user.Wherein, the charging amount of refrigerant medium affects the overall performance of evaporimeter largely, the charging amount of refrigerant medium is very few, easily causes heat exchanger tube local desiccation and causes the hydraulic performance decline of overall unit, and the charging amount of refrigerant medium is too much also unfavorable for the running of cost savings and unit.Therefore, how in reducing refrigerant medium charging amount, to make evaporimeter can well move and guarantee the heat exchange efficiency of evaporimeter, just become downward film evaporator assistant officer problem to be solved.
Summary of the invention
The object of the invention is provides a kind of mixing tube downward film evaporator for the problems referred to above, and this evaporimeter has reduced the charging amount of refrigerant medium in guaranteeing heat exchange efficiency.
For achieving the above object, the technical solution used in the present invention is: a kind of mixing tube downward film evaporator, it comprises housing, described housing internal upper part is provided with coolant distributor, the below of described coolant distributor is provided with horizontally disposed heat exchange nest of tubes, described heat exchange nest of tubes is made up of heat exchange of top part nest of tubes and bottom heat exchanger tube group, and the caliber of described bottom heat exchange nest of tubes is less than the caliber of described heat exchange of top part nest of tubes.
In the course of the work, can there are some refrigerant medium liquid in its housing bottom generally to downward film evaporator, and these liquid have flooded bottom heat exchange nest of tubes, thereby and on heat exchanger tube the heat in explosive evaporation absorption heat-exchange pipe.Therefore, heat exchange in the similar flooded type evaporimeter of heat transfer process of bottom heat exchange nest of tubes, in the time of normal operation, first the chilled water water inlet that temperature is higher will enter and fluid interchange from the heat exchanger tube of bottom, in general, the coefficient of heat transfer of the heat exchanger tube that external diameter is little can, higher than the large heat exchanger tube of external diameter, that is to say, heat transfer effect is more abundant, after chilled water flows out from the heat exchanger tube of bottom heat exchange nest of tubes, enter in the heat exchanger tube of Large Diameter Pipeline and carry out falling film type heat exchange, the chilled water of lower temperature is finally from compared with flowing out the heat exchanger tube of Large Diameter Pipeline, the heat exchanger tube refrigerant surface of the larger external diameter of cause is membranaceous mobile more abundant, chilled water in this class heat exchanger tube will be subject to heat exchange more fully, and the refrigerant medium that the heat exchange nest of tubes of pipe with small pipe diameter needs than the heat exchanger tube of Large Diameter Pipeline is few, therefore, reduce the external diameter of traditional downward film evaporator bottom heat exchange nest of tubes, not only can reduce the charging amount of refrigerant medium, and can keep the coefficient of heat transfer not reduce.
Further, the caliber of described heat exchange of top part nest of tubes is 25.4mm, and the caliber of described bottom heat exchange nest of tubes is 19.05mm.
Further, the heat exchange area of described bottom heat exchange nest of tubes is 20% ~ 35% of whole heat exchange nest of tubes heat exchange areas.
Accompanying drawing explanation
Fig. 1 is heat exchange nest of tubes sectional structure schematic diagram of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, be convenient to more clearly understand the present invention, but they do not form restriction to the present invention.
Mixing tube downward film evaporator, it comprises housing 1, described housing 1 internal upper part is provided with coolant distributor, the below of described coolant distributor is provided with horizontally disposed heat exchange nest of tubes 2, coolant distributor is for evenly spraying heat exchange nest of tubes 2 thereunder by refrigerant medium, described heat exchange nest of tubes 2 is made up of heat exchange of top part nest of tubes 201 and bottom heat exchange nest of tubes 202, the external diameter of described heat exchange of top part nest of tubes 201 each heat exchanger tubes is 25.4mm, the external diameter of described bottom heat exchange nest of tubes 202 each heat exchanger tubes is that 19.05mm(is as Fig. 1), and the heat exchange area of this bottom heat exchange nest of tubes 202 is 20% ~ 35% of whole heat exchange nest of tubes 2 heat exchange areas.
The course of work of the present invention is: the refrigerant medium of coming from condenser enters after distributor, from distributor, flow out, drip and drench on heat exchange nest of tubes 2, simultaneously, the bottom heat exchange nest of tubes 202 that first chilled water water inlet is 19.05mm from all external diameters, enter and flow, drip and drench refrigerant medium on heat exchange nest of tubes 2 and make the chilled water in heat exchanger tube obtain cold, last chilled water flows out from external diameter is the heat exchange of top part nest of tubes 201 of 25.4 millimeters, by cold quantity transmission to user.
In general, falling film evaporator can reduce coolant injection amount, and the present invention is because the heat exchanger tube that bottom heat exchange nest of tubes 202 adopts compared with pipe with small pipe diameter can not only keep the coefficient of heat transfer not reduce, and can further reduce coolant injection amount.Concerning enterprise, it is very necessary designing a kind of coolant injection amount downward film evaporator still less.
Claims (3)
1. a mixing tube downward film evaporator, it comprises housing (1), described housing (1) internal upper part is provided with coolant distributor, the below of described coolant distributor is provided with horizontally disposed heat exchange nest of tubes (2), it is characterized in that: described heat exchange nest of tubes (2) is made up of heat exchange of top part nest of tubes (201) and bottom heat exchange nest of tubes (202), and the caliber of described bottom heat exchange nest of tubes (202) is less than the caliber of described heat exchange of top part nest of tubes (201).
2. a kind of mixing tube downward film evaporator according to claim 1, is characterized in that: the caliber of described heat exchange of top part nest of tubes (201) is 25.4mm, the caliber of described bottom heat exchange nest of tubes (202) is 19.05mm.
3. a kind of mixing tube downward film evaporator according to claim 1 and 2, is characterized in that: the heat exchange area of described bottom heat exchange nest of tubes (202) is 20% ~ 35% of whole heat exchange nest of tubes (2) heat exchange area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210579499.7A CN103900292A (en) | 2012-12-27 | 2012-12-27 | Hybrid tube falling-film evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210579499.7A CN103900292A (en) | 2012-12-27 | 2012-12-27 | Hybrid tube falling-film evaporator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103900292A true CN103900292A (en) | 2014-07-02 |
Family
ID=50991776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210579499.7A Pending CN103900292A (en) | 2012-12-27 | 2012-12-27 | Hybrid tube falling-film evaporator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103900292A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106512454A (en) * | 2016-11-18 | 2017-03-22 | 重庆美的通用制冷设备有限公司 | Tube shell type falling-film evaporator and water chilling unit |
-
2012
- 2012-12-27 CN CN201210579499.7A patent/CN103900292A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106512454A (en) * | 2016-11-18 | 2017-03-22 | 重庆美的通用制冷设备有限公司 | Tube shell type falling-film evaporator and water chilling unit |
| WO2018090625A1 (en) * | 2016-11-18 | 2018-05-24 | 重庆美的通用制冷设备有限公司 | Tube shell type falling-film evaporator and water chilling unit |
| CN106512454B (en) * | 2016-11-18 | 2018-11-23 | 重庆美的通用制冷设备有限公司 | A kind of shell-and-tube type falling film evaporator and water cooler |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140702 |