CN101761997A - Countercurrent dew point indirect evaporative cooler - Google Patents

Countercurrent dew point indirect evaporative cooler Download PDF

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Publication number
CN101761997A
CN101761997A CN201010033817A CN201010033817A CN101761997A CN 101761997 A CN101761997 A CN 101761997A CN 201010033817 A CN201010033817 A CN 201010033817A CN 201010033817 A CN201010033817 A CN 201010033817A CN 101761997 A CN101761997 A CN 101761997A
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CN
China
Prior art keywords
dew point
air
wet
water
auxiliary air
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CN201010033817A
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Chinese (zh)
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CN101761997B (en
Inventor
刘忠宝
张强
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北京工业大学
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Priority to CN 201010033817 priority Critical patent/CN101761997B/en
Publication of CN101761997A publication Critical patent/CN101761997A/en
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Publication of CN101761997B publication Critical patent/CN101761997B/en

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Abstract

The invention discloses a countercurrent dew point indirect evaporative cooler, which comprises a dew point cooling machine core and a water supply and water distribution device, wherein the dew point cooling machine core is formed by parallelly stacking one or more cooling units in turn; each cooling unit comprises three parallel airflow channels which are respectively an airflow channel for primary air, a dry-side airflow channel for secondary air and a wet-side airflow channel for secondary air in turn, wherein the rear end of the dry-side airflow channel is provided with a baffle plate; the front and rear ends of the wet-side airflow channel are provided with baffle plates; a middle interlayer at the front end of the wet-side airflow channel is provided with a rectangular exhaust channel; a heat exchange clapboard between the airflow channel for the primary air and the dry-side airflow channel is provided with a perforation; and a nozzle is positioned in the exhaust channel close to the baffle plate at the front end of the wet-side airflow channel and faces the inside of the wet-side airflow channel. Water vapor in the wet-side airflow channel and the primary air in the neighboring channel perform countercurrent heat exchange, so the countercurrent dew point indirect evaporative cooler has the characteristics of high efficiency and environmental protection.

Description

A kind of countercurrent dew point indirect evaporative cooler
Technical field
The invention belongs to air-conditioning technical field, be specifically related to a kind of principle of air inversion heat exchange and water evaporation for cooling of utilizing and produce near water receiving devaporizer between the dew-point temperature air.
Background technology
Along with environmental pollution increasingly sharpens, the carbon discharge capacity is high, and people more pay close attention to energy consumption.Building energy consumption can account for 30% of social total energy consumption according to statistics, and the proportion of the energy consumption on heating and the air-conditioning in building energy consumption is more up to 55%.In the face of the severe day by day situation of this environment and energy problem, press for more energy-saving and environmental protection and the Eco-power heating air conditioning equipment developed.
Existing devaporizer mainly contains direct evaporative cooler and indirect evaporation cooler.Direct evaporative cooler can be cooled to its wet-bulb temperature to air, and indirect evaporation cooler can be cooled to air near its wet-bulb temperature, and the cooling scope is less.Several dew point indirect evaporative coolers have also appearred recently, a kind of is to utilize at least two single-stage indirect evaporation coolers to be cascaded, the direct wind outlet of upper level single-stage indirect evaporation cooler heat exchanger is connecting the direct wind inlet of next stage single-stage indirect evaporation cooler heat exchanger by the air channel, the bottom of upper level single-stage indirect evaporation cooler heat exchanger is told the autonomous channel and is being connected the indirect wind inlet in next stage single-stage indirect evaporation cooler heat exchanger bottom, realizes that finally the cooler outlet air themperature is near its dew-point temperature; Other dew point indirect evaporative coolers all are the principles of utilizing cooler internal gas flow cross flow one, be that air enters cooler, part air-flow enters the secondary gas flow passage through perforation, first and second gas channel square crossing is arranged, utilize the interior water of two subchannels to evaporate and cool off air-flow one time, the result realizes the purpose of outlet air temperature near its dew-point temperature.The dew point efficient that is existing dew point indirect evaporative cooler is on the low side, the highlyest also only reaches 77%.The present invention proposes a kind of principle of countercurrent flow, step-by-step movement cooling of utilizing and reach the devaporizer that approaches air dew point, structure is simpler, and efficient is higher.
Summary of the invention
Order of the present invention provides a kind of big cooling that both realized, also has the devaporizer of higher dew point efficient.
Particular content of the present invention is: a kind of countercurrent dew point indirect evaporative cooler, comprise dew point cooling movement and water supply and water-distributing device, wherein dew point cooling movement is formed so that the upper cooling cell body is stacked side by side successively by 1 or 1, each cooling unit body comprises three parallel gas flow passages side by side, be respectively the primary air gas channel successively, dried sidewind passage of auxiliary air and the auxiliary air sidewind passage that wets, each gas channel all is the same rectangular channel of sectional dimension, wherein there is baffle plate the rear end of the dried sidewind passage of auxiliary air, all there is baffle plate the rear and front end of the wet sidewind passage of auxiliary air, and on the intermediate interlayer of the wet sidewind passage front end of auxiliary air, have the air exhaust passage of rectangle, on the heat exchange dividing plate between primary air gas channel and the dried sidewind passage of auxiliary air, have perforation; Water supply wherein and water-distributing device include water pump, tank, water distributor, nozzle, water valve, water pipe, and wherein nozzle is arranged in the air exhaust passage of the wet sidewind passage of auxiliary air near preceding end-stopping plate, and nozzle is in the wet sidewind passage of auxiliary air.Water pump provides power, water sucking-off from tank, delivers to the nozzle place by water pipe, and each nozzle is wet channel of correspondence all, is in baffle plate 6 back of wet channel front end, and water goes to the wet channel the inside by nozzle ejection.
The heat exchange dividing plate of dew point cooling movement of the present invention can be made with plastic plate, sheet metal and the fibrous paper of 0.1mm~0.3mm; Intermediate interlayer can be made with plastic plate, sheet metal and fibrous paper, but thickness is not had special requirement.
Dew point cooling movement becomes 3 °-5 ° angle with horizontal plane, make the wetting whole wet channel of water energy.
Half is 4-8 for the quantity of perforation, and strengthens gradually along the dried sidewind flow direction of auxiliary air spacing.
Thereby nozzle adopts atomizer to make the particle water of ejection very little and can evenly enter wet channel.
The wet sidewind channel inner surface of auxiliary air is coated with hydroaropic substance.Because the existence of hydroaropic substance, not only strengthened the effect of water evaporation, guarantee simultaneously that in-channel water is difficult for forming current and how exist with the form of moisture film.
The countercurrent dew point indirect evaporative cooler that the present invention proposes is to utilize the dry-bulb temperature of air and the difference of the continuous wet-bulb temperature that reduces to come heat exchange, the dry-bulb temperature of final outlet air 13 is lower and near its dew-point temperature than the wet-bulb temperature of inlet air 12, and water capacity does not change.Cooler is to obtain wet-bulb temperature difference, air-flow that water capacity is identical by perforation; Realize cooling off by evaporation of water; By the heat exchange dividing plate cold is passed.
The present invention has following beneficial effect:
(1) in order to make the wet-bulb temperature difference of the identical auxiliary air of original state the time through perforation, cooler is interior along airflow direction, have a series of apertures (having 5 apertures in the experiment) on the heat exchange dividing plate between dried sidewind passage of auxiliary air and the wet sidewind passage of auxiliary air, bore dia is between 3mm~4mm, enlarge gradually along the distance between the dried sidewind flow direction of the auxiliary air aperture, make the air-flow that the enters next perforation longer distance of passing by like this, make its wet-bulb temperature lower.Thereby strengthened heat transfer temperature difference between the wet sidewind of primary air and auxiliary air, improved heat transfer efficiency.
(2) by atomizer water can effectively be evaporated, guarantee that with the angle that makes the cooler movement horizontal by 3~5 ° whole wet channel is all by water-wet by coating hydroaropic substance on the wet channel inwall.Thereby guarantee disengagement area and evaporated quantity of water.
(3) in order to make the more effective heat exchange of heat exchange dividing plate both sides energy, it all is reverse flow that the present invention makes between the air-flow, comprise dried sidewind of auxiliary air and the auxiliary air wet sidewind of sidewind, primary air air-flow and auxiliary air that wets, given full play to countercurrent flow like this than other form heat exchange advantage more efficiently all.Owing to use the thick plastic tab of 2.5mm, greatly reduced the thermal resistance of heat exchange dividing plate in addition.
Below in conjunction with the description of drawings and the specific embodiment the present invention is described in further detail.
Description of drawings
Fig. 1 cooler overall structure figure---wet channel place longitudinal profile schematic diagram;
Fig. 2 cooler one cell cube structural representation;
Fig. 3 cooler one planar structure schematic diagram;
Fig. 4 cooler cassette mechanism structure schematic diagram;
Among the figure: 1, tank, 2, water valve, 3, water pump, 4, water-supply-pipe, 5, horizontal water distributor, 6, baffle plate, 7, vertical water distributor, 8, nozzle, 9, air exhaust passage, 10, perforation, 11, the cooler movement, 12, air intake, 13, air-out, 14, air draft, 15, the heat exchange dividing plate, 16, intermediate interlayer, 17, the primary air gas channel, 18, the dried sidewind passage of auxiliary air, 19, the wet sidewind passage of auxiliary air, 20, primary air, 21, auxiliary air.
The specific embodiment:
The present invention uses two media, and one is water, and one is air.Flowing of water enters water pipe by tank 1, enters in the water pump 3 through water valve 2, pumps into water-supply-pipe 4 by water pump, enter horizontal water distributor 5 then, all assign to vertical water distributor 7 from horizontal water distributor again,, do not have the part water droplet of spirt wet channel to drop into tank after nozzle 8 sprays into wet channel.A water part that enters in the wet channel exists with the form of water smoke, and a part is caught wetting whole wet channel inwall by hydroaropic substance.
Flowing of air at first is that air intake 12 is divided into two, and a part is as primary air 20, and another part is as auxiliary air 21, and primary air is 1.5: 1 with the ratio of auxiliary air.Auxiliary air 21 10 enters wet wing passage 19 through boring a hole earlier behind overdrying wing passage 18, the water that comes by nozzle 8 is arranged in the wet wing passage 19, and be coated with hydroaropic substance in passage.Water in auxiliary air and the wet wing passage 19 carries out the caloic exchange, cool off the primary air 20 in the septal canal, cooled primary air 13 outputs to indoor, and the auxiliary air that exchanges through caloic is discharged from as the exhaust passage 9 of exhaust 14 through the cooler front end.And auxiliary air is cooled off by step-by-step movement after entering the dried sidewind passage 18 of auxiliary air, promptly take a step forward forward just once by darker cooling, thereby more to the back, it is low more to enter preperforative gas flow temperature, because its water capacity does not change, so the wet-bulb temperature of air-flow is also just more and more lower, finally make the dew-point temperature of the wet-bulb temperature of the air-flow that passes last row's perforation near air intake 12.Specifically be such: auxiliary air enters dried sidewind passage 18, it is but clammy to be absorbed heat etc. by the evaporation of the water in the wet channel of next door earlier before arriving first perforation, the water that secondary gas flow enters in first perforation back reverse flow and the wet channel carries out the mass transfer heat exchange, the primary air in cooling next door; Auxiliary air flows forward along dried sidewind passage and flows to second perforation place by first perforation place, air-flow is constantly but clammy by the wet channel in next door etc. again in this process, make that the wet-bulb temperature when air-flow passes second perforation is lower, secondary gas flow enters wet channel through second perforation adverse current and carries out the heat that evaporative cooling absorbs the next door primary air, makes that the primary air temperature is lower; Same auxiliary air continues to flow forward along dried sidewind passage, when arriving the 3rd perforation place, to compare temperature lower with the auxiliary air of second perforation place, water capacity is constant, thereby can obtain lower gas flow temperature after entering the 3rd perforation, the temperature that is cooled of the primary air in next door is also lower like this; Auxiliary air continues to flow successively through the 4th, the 5th perforation forward along dried sidewind passage, and same evaporative cooling process takes place.Whole process gets off to make the dew-point temperature of the dry-bulb temperature of primary air air-out 13 near air intake 12.
The present invention carries out heat exchange by the primary air in evaporation of the water in the wet channel and the septal canal, and the stream of the air in the wet channel is the adverse current form with primary air flows, so heat exchange efficiency height, the used cold-producing medium of cooler is a water in addition, comparatively environmental protection, thereby the cooler outstanding behaviours is the characteristics of efficient, energy-conservation and environmental protection.Through overtesting, this cooler wet bulb efficient reaches 121%, and dew point efficient reaches 84%, and system COP reaches 9.4.The present invention can be widely used in humidity area in China.

Claims (8)

1. countercurrent dew point indirect evaporative cooler, comprise dew point cooling movement and water supply and water-distributing device, it is characterized in that described dew point cooling movement (11) is formed so that the upper cooling cell body is stacked side by side successively by 1 or 1, each cooling unit body comprises three parallel gas flow passages side by side, be respectively primary air gas channel (17) successively, dried sidewind passage of auxiliary air (18) and the auxiliary air sidewind passage (19) that wets, each gas channel all is the same rectangular channel of sectional dimension, wherein there is baffle plate the rear end of the dried sidewind passage of auxiliary air (18), all there is baffle plate the rear and front end of the wet sidewind passage (19) of auxiliary air, and on the intermediate interlayer (16) of wet sidewind passage (19) front end of auxiliary air, have the air exhaust passage (9) of rectangle, on the heat exchange dividing plate (15) between primary air gas channel (17) and the dried sidewind passage of auxiliary air (18), have perforation (10); Described water supply and water-distributing device include water pump (3), tank (1), water distributor (7), nozzle (8), water valve (2), water pipe (4), wherein nozzle (8) is arranged in the air exhaust passage (9) of the wet sidewind passage (19) of auxiliary air near preceding end-stopping plate, and nozzle is in the wet sidewind passage of auxiliary air.
2. a kind of countercurrent dew point indirect evaporative cooler according to claim 1 is characterized in that plastic plate, sheet metal and the fibrous paper of the available 0.1mm~0.3mm of described heat exchange dividing plate (15) made.
3. a kind of countercurrent dew point indirect evaporative cooler according to claim 1 is characterized in that described dew point cooling movement (11) becomes 3 °-5 ° angle with horizontal plane.
4. a kind of countercurrent dew point indirect evaporative cooler according to claim 1 is characterized in that described perforation (10) strengthens gradually along the dried sidewind flow direction of auxiliary air spacing.
5. a kind of countercurrent dew point indirect evaporative cooler according to claim 1, the quantity that it is characterized in that described perforation (10) are 4-8.
6. a kind of countercurrent dew point indirect evaporative cooler according to claim 1 is characterized in that described nozzle (8) adopts atomizer.
7. a kind of countercurrent dew point indirect evaporative cooler according to claim 1 is characterized in that wet sidewind passage (19) inner surface of described auxiliary air is coated with hydroaropic substance.
8. a kind of countercurrent dew point indirect evaporative cooler according to claim 1 is characterized in that the available plastic plate of described intermediate interlayer (16), sheet metal and fibrous paper make.
CN 201010033817 2010-01-08 2010-01-08 Countercurrent dew point indirect evaporative cooler CN101761997B (en)

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CN101761997B CN101761997B (en) 2013-01-16

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103245017A (en) * 2013-04-12 2013-08-14 西安工程大学 Closed cross-flow plate-fin dew-point indirect evaporative cooling outdoor unit
CN103776118A (en) * 2014-02-19 2014-05-07 天津大学 Novel kitchen air conditioner
CN104864530A (en) * 2015-05-20 2015-08-26 陈明标 Precooling convection type evaporative refrigeration core unit
CN105222260A (en) * 2015-11-10 2016-01-06 上海理工大学 The modular evaporation-cooled device that dry wet channel combines
CN105571032A (en) * 2016-02-17 2016-05-11 陈明标 Inserting-tube-type dew-point evaporation core body
CN106989459A (en) * 2017-03-03 2017-07-28 西安工程大学 Countercurrent dew point indirect evaporative cooling air conditioning group
CN109489152A (en) * 2018-09-25 2019-03-19 安徽科恩新能源有限公司 A kind of composite energy accumulated system based on earth source heat pump Yu the accumulation of energy of multi-groove type water
CN111773890A (en) * 2020-06-29 2020-10-16 南京航空航天大学 Solar regeneration solution dehumidification system and method based on electrowetting

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100409265B1 (en) * 2001-01-17 2003-12-18 한국과학기술연구원 Regenerative evaporative cooler
US6845629B1 (en) * 2003-07-23 2005-01-25 Davis Energy Group, Inc. Vertical counterflow evaporative cooler
CN100480590C (en) * 2007-06-05 2009-04-22 西安工程大学 Point exposed plate type indirect evaporation cooler
CN101464103B (en) * 2007-12-19 2011-09-28 于向阳 Counterflow indirect evaporative cooler
CN201187919Y (en) * 2008-04-14 2009-01-28 西安工程大学 Porous ceramic plate fin type indirect evaporative cooler
CN101329104B (en) * 2008-07-14 2011-07-27 西安工程大学 Square porous ceramic vertical tube type dew point indirect evaporative cooler

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103245017A (en) * 2013-04-12 2013-08-14 西安工程大学 Closed cross-flow plate-fin dew-point indirect evaporative cooling outdoor unit
CN103245017B (en) * 2013-04-12 2016-01-13 西安工程大学 The off-premises station of enclosed distributary plate wing dew point indirect evaporative cooling
CN103776118A (en) * 2014-02-19 2014-05-07 天津大学 Novel kitchen air conditioner
CN103776118B (en) * 2014-02-19 2017-01-04 天津大学 A kind of air conditioner used in kitchen
CN104864530A (en) * 2015-05-20 2015-08-26 陈明标 Precooling convection type evaporative refrigeration core unit
CN105222260A (en) * 2015-11-10 2016-01-06 上海理工大学 The modular evaporation-cooled device that dry wet channel combines
CN105222260B (en) * 2015-11-10 2017-12-26 上海理工大学 The modular evaporation-cooled device that dry and wet passage combines
CN105571032A (en) * 2016-02-17 2016-05-11 陈明标 Inserting-tube-type dew-point evaporation core body
CN106989459A (en) * 2017-03-03 2017-07-28 西安工程大学 Countercurrent dew point indirect evaporative cooling air conditioning group
CN109489152A (en) * 2018-09-25 2019-03-19 安徽科恩新能源有限公司 A kind of composite energy accumulated system based on earth source heat pump Yu the accumulation of energy of multi-groove type water
CN111773890A (en) * 2020-06-29 2020-10-16 南京航空航天大学 Solar regeneration solution dehumidification system and method based on electrowetting

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