Evaporative Cooling Fan Using String-Screen-Fills as Heat Exchanger and Fabrication Thereof
The present invention involves an evaporative cooling fan including air cooling and vapor removal heat exchangers using string heat exchanger fabricated with string-screen-fill packs, which are formed of a multiplicity of string-screen-fill with string screens on both sides. The air cooling heat exchanger cools hot air by contacting with cold water and vapor removal heat exchanger condenses vapor by contacting with cold water. Using such cooling or condensing function of the string heat exchanger, vapor removable and non-removable evaporative cooling fans are invented in the present invention. The vapor non-removable cooling fan is preferred to be operated in environmentally open area and the vapor removable cooling fan is operated in any places. Both evaporative cooling fans have an advantage to be operated in the high humid area. In the present invention, the fabrication methods of vapor removable and non-removable evaporative cooling fans are described.
U.S. application Ser. No. 13/053,382, Mar. 22, 2011. Park
U.S. application Ser. No. 61/726,928, Nov. 21, 2012. Park
U.S. application Ser. No. 61/820,102, May 6, 2013. Park
U.S. application Ser. No. 13/895,368, May 16, 2013. Park
U.S. application Ser. No. 13/888,327, Jun. 6, 2013. Park
Foreign Patent Documents
- THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS, 345 E. 47 St., New York, N.Y. 10017, 88-GT-41,http://www.muellerenvironmental.com/documents/100-020-88-GT-41.pdf Air Conditioning psychrometrics, CRD Engineering.com,
- http://www.cedengineering.com/upload/air%20conditioning%20psychrometrics.pdf
- Engineerigtoolbox.com, Mixing Humid Air, http://wvvw.engineeringtoolbox.com/mixing-humid-air-d—694. html
- Telstar International Technology Co., Ltd., http://www.telstar-tech.com.tw/Product/fan-04.htm Cooling Tower Depot, Cross Flow Fill With Louver or Drift Eliminator,
- http://www.streamlineextrusion.com/files/manuals/paper4.pdf
- STAR COOLING TOWERS, Countedlow and Crossflow Film Fills,
- http://starcoolingtowers.com/coolingtowerfill
- Wikipedia, http://en.wikipedia.org/wiki/Wind_chill
Not Applicable.
REFERENCE TO SEQUENCE LISTING, A TABLE, OR A COMPUTER PROGRAM LISTING CPMPACT DISC APPENDIXNot Applicable.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to air cooling fan utilizing evaporative cooling heat exchanger. More precisely, the present invention relates to an evaporative air cooling fan using plate type string-screen-fills as a heat exchanger, which is fabricated with strings, using the unique characteristics of string: flowing down of water on the surface of the vertical string by gravity, surface tension of string strong enough to hold the water on the surface of string against the strength of cooing air draughts, and capability of contacting water and cooling air with barely resisting air flowing through the strings.
2. Description of the Related Art
Although an air condition is used to obtain cool and refreshing air, a fan or evaporative cooler are used to save electric consumption for generation of cool and refreshing air. In an open area like auto mechanical shops, a big fan is commonly used to slightly cool workers by being exposed to blowing wind of the big fan. However, the blowing wind does not have capability of cooling enough to make them feel cool and refreshing, because the temperature of the blowing wind is same as that of the machine shop or any open area. And another models to save electric consumption are water evaporative coolers, which are commercialized at the present time. They are using a fabric honeycomb cooling pad (fills) as a heat exchanger. The function of the water evaporative cooler is to cool hot air through transferring of some heat preserved in the hot air to water by evaporation and convection mechanism of water on the contact area between water and air. Hence, the higher temperature and less humidity of air, the cooler can be expected the hot air. In other words, the water evaporative cooler cannot cool air in the high humid of air because the actual evaporation process of water cannot occur near to the saturated vapor condition (high humid) of the air. Therefore, the current commercial evaporative coolers are sold in dry and hot area, southern part of the United States, especially in Texas, New Mexico, Nevada, etc., but not popular in high humid areas, east coast and northern parts of the United States. Also under the hot and low humid conditions of air, the current evaporative cooler cannot be used in the closed room area because of the following reasons: the vapor generated by the evaporation and convection mechanisms of water during cooling of air remains in the room and increases the humidity of air in the room to reach the vapor saturation condition of air. Eventually, the evaporation process of water evaporative cooler is terminated.
The compensation of such drawbacks of the current evaporative cooler and machine shop big fan can be accomplished by removing some vapor retained in the cooled and humid air generated by operation of the current evaporative coolers. In fact, the cooled air passing through the evaporative cooler is lower temperature and higher humid than those of machine shop environment, but the workers exposed to such cool and humid air feel cool and refreshing, since the high humid in the cooled air does not affect increasing humidity of air in machine shop due to environmentally opening of machine shop. Namely, the vapor retained in cooled air is so quickly dissipated into the environmental level of vapor in the machine shop air that the workers cannot feel accumulated humid in air.
The removal of vapor generated through the commercial evaporative cooler can be achieved by passing the humid air through the dew point heat exchanger (DEWHX) which retains lower temperature than dew point temperature of vapor in humid air, since the vapor is condensed into dew by contacting with objects sustaining lower temperature than dew point temperature of vapor. At the same time the vapor is condensed into dew, the cooled and humid air passing through the evaporative heat exchanger (EVAHX) is cooled by dissipating some heat retained in cooled and humid air to the DEWHX through the convection and condensation mechanism of water contacting with the cooled and humid air. Hence, the cooled and humid air passing through EVAHX can reduce its moist content to a comfort level by vapor condensing process of DEWHX.
To cool and condense hot humid air and to compensate the disadvantages of the current evaporative cooler and machine shop big fan described above, the EVA cooling fan and EVADEW cooling fan are invented by the inventor of the present invention using plate type string-screen-fills (SSF), which is applied to U.S. patent by the present inventor (U.S. patent application Ser. No. 13/053,382). The EVA and EVADEW cooling fans are schematically drawn in
The water cooling functions and advantages of the rectangular SSF pack previously invented by the present inventor are briefly described in this section. When the water to be cooled is sprayed on the top perforated plate of the rectangular SSF pack, the sprayed water spreads over the top perforated plate and is uniformly imbibed down through holes by the surface tension of strings suspending from through the holes on the top and bottom plates of the SSF pack, and then flowing down on the surface of strings. The water flowing down on the surface of strings becomes circumferential thin film water on the circular surface of string, which can make a contacting area between water and cooling air maximized and also make the water as thin as possible. Such conditions of water flowing down on the surface of strings are significant advantages of strings to provide high water cooling efficiency of water. And another significant advantage of string is that the flowing down of water on the surface of strings does not create any conditions of forming scales and fouling on strings, which means no formation of the scales and fouling in the SSF pack, resulting in no-reduction of the flowing rate of cooling air and the serve life of SSF pack.
<Cooling Method of Hot Air Using Water Evaporative Technique> On the surface of water contacting with hot ambient air retaining low concentration of vapor (hot dry air), water molecule in water evaporates by absorbing latent heat energy from the ambient air to escape from the surface of water. As a result of such evaporation process of water, the temperature of the ambient air gets lower and on the contrary, the vapor concentration gets higher, compared with the initial temperature and vapor concentration of the ambient air. When such evaporation process is performed in an enclosed area, the concentration of vapor reaches saturation, resulting in a termination of the evaporation process, while the performance of the evaporation process can be continued where the area is environmentally open, because the vapor disperses to environmental level of vapor concentration. Thus, the EVA cooling fan of the present invention is preferred in the open area like auto machine shop or large confined facilities. In the small enclosed area, the EVADEW cooling fan of the present invention is applicable. When the hot dry air is passing through the EVADEW cooling fan, the evaporation process of water take places in the EVAHX (operates by using normal room temperature tap water), because the evaporation process of water dominates due to the low concentration of vapor in air. During cooling the air by evaporation process, the temperature of the air decreases and the vapor concentration increases. When the concentration of vapor of the ambient air has passed the pre-set point of a comfort vapor level, the DEWHX initiates its operation by supplying new cold water (used cold water having passed through the DEWHX is not re-circulated and discharged out of the cooling fan to keep the DEWHX in a constant low temperature) whose temperature is at or below the dew point of ambient air retaining a comfort level of vapor concentration and then the vapor having passed through the EVAHX is allowed to continually travel through the DEWHX. In the DEWHX, the excess vapor in the ambient air due to contacting with the dew point temperature of DEWHX is condensed and absorbed on the surface of cold water flowing down on the strings. Thus, the ambient air having got through the EVADEW cooling fan becomes cool (Temperature in summer is between 73 and 80° F.) and comfortable level of vapor concentration (RH in summer_is between 20 and 78%).
For cooling of the hot ambient air containing high vapor concentration (hot and high humid air), the condensation cooling process dominates and so the EVADEW cooling fan is preferred. To eliminate vapor in the high humid air, the DEWHX in the EVADEW cooling fan initially operates by supplying cold water as described. When the hot and high humid air is passing over the surface of water flowing down on the strings in the DEWHX, the vapor in the air condenses into water by changing itself into water molecules on the water surface whose temperature is lower than the dew point of incoming hot and humid air. Hence, the amount of vapor retained in the air gets lower and the temperature of the water increases due to dissipating of the heat (latent heat) retained in vapor to the bulk water. In this case, the temperature of air decreases and the concentration of vapor in air decreases until the vapor in the air reaches the saturation state (evaporation rate of water molecules and condensation rate of vapor are equalized) because condensation rate of vapor is much greater than reversing rate to air of vapor due to the dominant condensation of vapor. Such net transferring of vapor to air usually takes place in the high humid air. To accelerate the cooling of hot humid air to reach the comfort level of vapor and temperature (a comfort zone in summer is defined as temperature is between 73 and 80° F. and relative humidity is between 20 and 78%.) of the air, the operation of DEWHX pauses and then the EVAHX initiates the evaporation process of water by circulation of tap water when the concentration of vapor reaches a moderate low level (vapor concentration is still high). As the concentration of vapor in the air is low enough for evaporation to take place under moderate level of temperature of air, the evaporation process occurs. Owing to the evaporation process of water, the temperature of the air gets lower and the vapor in the air slightly increases. After temperature and vapor reaches a moderate level (still higher than comfort zone level), the DEWHX initiates again for both of them to be operating to decrease temperature and vapor concentration to reach the comfort zone of air. When the comfort zone level is reached, the flow rates of tap water and cold water are controlled to keep the room conditions in comfort level. Likewise, while such cooling process of hot and high humid air is carry out in a room or closed area, the room air is cooled by alternatively operating the EVA and EVADEW cooling fan. The tap water, directly used for cooling temperature of air in the EVAHX, is circulated through the tap water reservoir tank, while the cold water for condensing vapor is supplied into the DEWHX, which is provided by passing through an ice tank from faucet. The colder than its dew point the water used for condensing vapor is, the faster and more the vapor condenses. To maintain such condensation of vapor, the coldness of cold water should be kept steadily lower than dew point temperature. To do this, the new cold water should be continuously introduced to pass once through the DEWHX instead of its circulation, which means the once used cold water is discarded out of the EVADEW cooling fan.
To save water due to rejecting it to the environments, the flow rate of cold water is controlled lower than 1.5 gallon/hour per square foot (cited from reference of the American Society of Mechanical Engineers) of cross section of the DEWHX. The water of 1.5 gallon per hour of cold water is uniformly sprayed on the entire top perforated plate of the DEWHX and imbibed through the entire holes by surface tension of wet strings threaded over the holes and then flows down the strings by wetting the entire surface of strings contacted by air passing transversely through strings. The total amount of water being necessary to completely wet all surfaces of strings is a quantity of water being capable to form thin water film on the surface of strings whose temperature of cold water warms up close to the dew point of cold water at the bottom of strings. The cooling of air is achieved by evaporation of water and convection of heat at the interface between air and water as described. However, when the vapor condenses onto the surface of cold water, a net warming occurs on that surface of the water, because the vapor forms water molecules by absorbing latent heat in the air due to its condensation process when it has interacted on the cold surface of water and then a larger amount of water molecules bringing heat in themselves are absorbed into water, compared with inversed amount of vapor re-evaporated from the surface of water. Correspondingly, the ambient air surrounding the interface of air and water gets cool.
The purpose of the present invention is a fabrication of the evaporative cooling fans, including EVAHX and DEWHX, using the plate type SSFs eliminating the disadvantages exhibited in the machine shop big fan and in the current evaporative coolers.
SUMMARY OF THE INVENTIONThe EVA and EVADEW cooling fans of the present invention are schematically illustrated in
The fabrication of the evaporative cooling fans is completed through four steps of fabrications: determination of fabrication factors, the fabrication of SSFs and SSF packs, installation of the SSF packs into the evaporative cooling fans, and performance test of the evaporative cooing fans. The determination of fabrication factors of SSF and SSF pack requires determination of a lot of factors such as string materials and type, hole size on the top and bottom perforated plate of the evaporative heat exchanger, interval between adjacent strings in the heat exchanger, specific number of strings per unit cross section area of SSF pack, variation of specific area of SSF pack depending on string diameter, water cooling effective length of string in heat exchanger, verification of flying away of water from strings, correlation factor for computation of hole size from arbitrary string size, and cooling effect due to string type.
The fabrication of SSFs and SSF packs includes fabrication of SSF frame having attachment tabs and semi-circular holes on frame, winding a long string over the SSF frame, and assembly of a plurality of SSFs into SSF pack. One or more SSF packs are installed into the location of the evaporative heat exchanger and vapor condenser in the evaporative cooling fans and then finally the performance of the evaporative cooling fans is tested. The determination of fabrication factors of the SSF and SSF pack and the fabrication of SSF and SSF pack are described in detail in the previous invention of String-Thick-Plates Pack for Use in Cooling Tower (U.S. application Ser. No. 13/053,382) invented by inventor of the present invention. The installation of SSF packs in the evaporative cooling fans and its performance test are described here in the present invention and also the fabrication of the SSF and SSFs pack is briefly described.
<Fabrication of SSF and SSFs Pack> The SSF pack is fabricated by assembling a plurality of the SSFs invented by the present inventor. One unit of SSF is a rectangular shape string screen plate with two vertical-string-screens (VSS) on its both sides, which are apart in 1 cm, other dimensions are possible, and strings are wound over the top and bottom frames in the longitudinal direction as shown in
The SSF is fabricated by winding a single long string over the top and bottom frames of the SSF rectangular frame as shown in
The SSF used for fabrication of DEWHX is fabricated by reducing the string spacing of adjacent strings by half of the string interval of SSF used in EVAHX with other dimensions same. The DEWHX requires small amount of water, compared with amount of water used in EVAHX, to condense water on the surface of strings, and in turn the thickness of water flowing down on the surface of strings is thinner. Hence, the string spacing can be reduced, since there is no problem for wet strings to be stuck together due to thick water flowing down on the surface of strings. Reduction of the string spacing increase chances of contacting of vapor and water, and therefore thickness of SSF pack can be reduce by the same reduction rate of the string spacing. Thus, the thickness of the SSF used for DEWHX is reduced by half of that used for EVAHX: dimensions of the thinner SSF for DEWHX are 15(W)×30(H)×5(D)cm and 15(W)×60(H)×5(D) cm.
<String Materials and String Type> The string used in the present invention is a polyester string, other materials are possible, which has excellent physical and chemical properties like high melting temperature, high resistance to most chemicals, high tenacity for stretching and shrinking, and high durability so that the polyester string is suitable for fabrication of SSF. The polyester strings used in the present invention are spiral corrugated non-hairy and hairy polyester strings, other string types are possible. The hairy and spiral corrugate on string effect the cooling of hot air to be cooled by 5% lower than plain string. Therefore, when the hairy and corrugated string is used to the evaporative cooling fan, the cooling effect of the evaporative cooling fan can be increased by 5% more.
<Determination of Thickness of SSF Pack> To determine the thickness of SSF pack able to effectively cool and condense the hot moist air using SSF with thickness of 10 mm, several thicknesses of the SSFs pack, 5, 10, and 15 cm, were tested. As results of testing, the effective thickness of the SSF pack fabricated with strings of 2.5 mm in diameter is determined to be 10 cm, wherein the air is cooled down to 30% of the inlet air temperature and the moisture is removed by 35%.
<Fabrication and Installation of EVAHX and DEWHX> EVAHX and DEWHX are fabricated in an exactly same way and configuration, but thickness of the DEWHX is thinner than that of the EVAHX. The EVAHX is fabricated using standard SSF packs shown in
<Advantages of Present Invention> Major advantage of the EVADEW cooling fan and EVA cooling fan of the present invention is the ability to substantially reduce the moisture content in the cooled air by more than 30% of those of the current evaporative coolers and to be continuously used in the machine shop without any problems of moisture accumulation in the machine shop, respectively.
Another major advantage of the EVADEW cooling fan and EVA cooling fan of the present invention is the ability to cool a room enough as low as an air conditioner cools it without using of cooling agent and compressor, which reduces a large amount of electric consumption by 30% of that of the air conditioner.
Minor advantage of the present invention is the ability to be in service life of more than 25 years since the polyester strings and aluminum used in the present invention has excellent physical and chemical properties like high melting temperature, high resistance to most chemicals, high tenacity for stretching and shrinking, and high durability.
And further advantage of the SSFs packs of the present invention within the cooling towers is that the materials of the SSFs pack, polyester strings, aluminum or aluminum alloy, polypropylene, are non-hazardous and suitable for safe and disposal at the end of service life.
<Description of Number in the Drawings> 1 machine shop cooling fan, 2 new cold water or circulated water supplier, 3 water sprayer, 4 air filter. 5 string, 6 water level controller, 7 water discard outlet port, 8 water reservoir, 9 water inlet port to water circulation pump, 10 water circulation pump, 11 solenoid valve, 12 tap water inlet port. 13 axial fan blower, 14 air flow direction, 15 ice tank water cooler, 16 top perforated plate of heat exchanger, 17 EVAHX, 18 bottom perforated plate of heat exchanger, 19 DEWHX, 20 EVADEW cooling fan, 21 circulated water inlet pipe to EVAHX, 22 circulated water sprayer, 23 used cold water transport pipe, 24 single unit of SSF, 25 top frame of SSF frame, 26 pathway of cooling air, 27 bottom frame of SSF frame, 28 side frame of SSF, 29 unit standard SSFs pack of 15(W)×30(H)×10(D)cm, 30 discharge of cool air, 31 top perforated plate of SSF, 32 entrance of hot air, 33 guiding wall to control direction of traveling of hot air, 34 bottom perforated plate of SSF, 35 unit standard SSFs pack of 15(W)33 60(H)×10(D)cm, 36 evaporative or condensing heat exchanger pad of 30(W)×30(H)×10(D)cm, 37 evaporative or condensing heat exchanger pad of 60(W)×60(H)×10(D)cm, 38 evaporative or condensing heat exchanger pad of 90(W)×90(H)×10(D)cm, 39 heat and vapor generator, 40 flow direction of heat and vapor, 41 duct ventilation hood, 42 room air flow, and 43 insulated duct.
<Designing of EVA and EVADEW Cooling Fans> The components of the EVA cooling fan 1 are EVAHX 17, axial fan blower 13, water circulation pump 10, water sprayer 3, ice water cooler 15, tap water solenoid valve 11, water reservoir 8, and water tank water level controller 6. The EVAHX 17 and axial fan blower 13 are horizontally installed by positioning of the EVAHX 17 behind the axial fan blower 13 as shown in
<Fabrication and Installation of EVAHX in EVA Cooling Fan> The size of the EVAHX 17 is determined, whose cooling active size is equal and greater than the diameter of fan blower 13. Then, the EVAHX 17 is fabricated as shown in
<Fabrication and Installation of DEWHX in EVADEW Cooling Fan> In the same way as in the EVA cooling fan 1, the DEWHX 19 is fabricated by assembling side by side or combining thinner SSF packs 29, 35 depending on the fan blower size and then inserted between fan blower 13 and EVAHX 17 as shown in
<Operation of EVA Cooling Fan> Tap water is directly supplied under the control of the solenoid valve 11 to the top perforated plate 16 of the EVAHX 17 of the EVA cooling fan 1 through the water inlet port 12 and then the water is sprayed on the top perforated plate 16 of the EVAHX 17. The sprayed water is imbibed by the strings 5 into the holes on the perforated plate 16 and then flows down on the surface of the strings 5 suspended from between top and bottom perforated plates 16, 18 of the EVAHX 17. The water reached to the bottom perforated plates 18 of the EVAHX 17 flows out of the EVAHX 17 through the holes on the bottom perforated plate 18 and then is collected in the water reservoir tank 8. The water in the water reservoir tank 8 is circulated by the water circulation pump 10 to the water sprayer 3 on the top of the EVAHX 17 and then flows down through the EVAHX 16. The hot air comes into the EVA cooling fan 1 through the air filter 4 on the entrance of the hot air by the forced draught of the fan blower 13, which is on the opposite side of the entrance of the hot air. The hot air 14 travels transversely through the strings 5 vertically suspended from between the top and bottom perforated plates 16, 18 and then flows out of the EVA cooling fan 1 through the fan blower 13 as shown in
<Operation of EVADEW Cooling fan> The EVAHX 17 of the EVADEW cooling fan 20 operates in the same way as that of the EVA cooling fan 1 operates except for no-supplying of the tap water. Tap water is supplied after passing an ice tank water cooler 15 under the control of the solenoid valve 11 to the top of the DEWHX 19 of the EVADEW cooling fan 20 through the water inlet port 12 and then the cold water is sprayed on the top perforated plate 16 of the DEWHX 19. The supplied cold water flows down on the surfaces of strings 5 built in the DEWHX 19 to the bottom of the DEWHX 19 and then is transferred through the used cold water transferring pipe 23 to the water reservoir 8 located at the bottom of the EVAHX 17. The transferred used cold water mixes with a warm water previously reserved in the water reservoir 8. The mixed water is circulated to the top of the EVAHX 17 by the water circulation pump 10 and flows down on the strings 5 built in the EVAHX 17. Likewise, simultaneously supplying water to the DEWHX 19 and EVAHX 17, the cold water and warm water are respectively flowing down on the surface of the strings 5 built-in the DEWHX 19 and EVAHX 17 at the same time. During the flowing down of water on the surface of the strings 5 in the both heat exchanger 17, 19, the hot moist air 14 comes into the EVADEW cooling fan 20 and discharges out of the EVADEW cooling fan 20 through the fan blower 13 on the opposite side of the entrance of the hot moist air 14 after traveling transversely through the strings 5 of the 2 heat exchangers, EVAHX 17 and DEWHX 19, which are consecutively built in the EVADEW cooling fan 20. The hot moist air coming into the EVADEW cooling fan 20 cools by the same way as described in the EVA cooling 1. The cooled air passing through the EVAHX 17 continuously enters the DEWHX 19. In the DEWHX 19, some vapor retained in the moist cool air contacts with cold water (temperature of the water is lower than dew point temperature of vapor) flowing down on the surface of the strings 5 to condense and to be absorbed onto the water on the surface of the strings 5. After passing through the DEWHX 19, the air becomes cool and dry.
<Performance Test of Evaporative Cooling Fan by Psychrometric Chart> When air contacts with water, the transfers of heat and vapor take place through the air and water body and their interface. Their transfers are affected by combination of evaporation, convection, and infrared radiation, resulting in increasing or decreasing of enthalpy (latent heat and specific heat) and temperature (wet and dry bulb) and specific volume of air, concentration (relative and specific humidity) of vapor, and temperature of water. Such designing factors of the evaporative cooling fan should be calculated using empirical and theoretical equations relating to them. However, they can be simply obtained from psychometric chart developed employing all relevant variables for water evaporative cooling mechanism. Accordingly, if two factors are known, others can be obtained from the psychrometric chart.
Exemplary operations of the EVA and EVADEW cooling fan 1, 20 for cooling hot room air retaining high, medium and low humidity into comfort zone of 73-80° F. and 20-78% RH in summer using psychrometric chart are described as follows. First, the hot humid air retaining 95° F. and 75% relative humidity (0.027 lbs-moisture/lb-dry-air) is cooled by the cooling operation cycle one (CC1) of cooling fan as shown in
In case of the room air retaining medium and low humidity, the operation of EVADEW cooing fan 20 is preferred like cooling cycles of a→b→c→d→e→f→*, Cooling Operation Cycle 2 (CC2), and I→II→III→IV→#, Cooling Operation Cycle 3 (CC3), respectively, as shown in
Low humidity cooling cycle of I→II→III→IV→# (CC3) with the initial room condition of 95° F. and 15% RH marked at Node I in
<Psychrometric Chart Zones of Initial Room Conditions Able to Be Cooled into Comfort Zone> The comfort zone is a range of temperature and humidity conditions of air which people can feel comfortable within. Their ranges in summer are 73-80° F. and 20-78% RH, respectively, which are marked as a shaded area in the psychrometric chart shown in
<Application of EVADEW Cooling Fan to Dry Cleaning Shop> Room air in a dry cleaning shop usually is hot and humid, since heat and steam generated from operation of a steam press 39 is accumulated in the interior of the cleaning shops. In summer, the extent of getting hot and humid in the shop is much severer. In a typical dry cleaning shop, a cloth steam press 39 is placed near to the wall or corner of the shop to maximize an efficiency of working and usage of space and windows or doors are keeping open to control the accumulation of moist in the shop. To effectively circulate shop air, the EVADEW cooling fan 20 is placed near the opposite wall across shop from the steam press 39 and to prevent directly dissipating of heat and moist from the steam press 39 to interior space, a duct 43 is installed between the steam press 39 and the EVADEW cooling fan 20 and its duct ventilation hood 41 l is suspending from ceiling above the steam press 39 as shown in
The operation of the EVADEW cooling fan 20 is initiated supplying tap water and cold water to the top perforated plates of the EVAHX 17 and DEWHX 19 built in the EVADEW cooling fan 20, respectively. Next, the air circulation fan puts into operation and then the room air is circulated through the duct hood 41, duct 43, EVADEW cooling fan 20, and room space. The room air passing through entire room space re-enters the duct hood 41 and circulates through the same route. Such circulation of the room air continues until the operation of the EVADEW cooling fan 20 is stopped. During the circulation of the room air, the tap water and cold water supplied to the top perforated plates have been imbibed into the holes on the top perforated plates and flown down on the surface of strings built in the EVAHX 17 and DEWHX 19, respectively, and the room air is transversely traveling through the strings in the EVAHX 17 and DEWHX 19 built in EVADEW cooling fan 20 and discharged into the room space. While the water and room air are crossly flowing each other in the EVAHX 17 and DEWHX 19, the room air contacts with water on the surfaces of the strings to be cooled and dry or humid (controlled by pre-setting of relative humidity to meet the conditions of the comfort zone). During the operation of the EVADEW cooling fan 20, the hot humid air at location L2 shown in
Using the pschrometric chart, the cooling process of extremely hot and humid air generated from the steam press 39 in a typical dry cleaning shop is explained_as shown in
While the present invention has been described as having an exemplary design, this invention may be further modified within the concept and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention relates.
Claims
1. An EVA cooling fan, comprising:
- a fan blower, evaporative heat exchanger, water circulation pump, water tank, and water sprayer as components of said EVA cooling fan, wherein said fan blower and said evaporative heat exchanger are horizontally installed by attaching said evaporative heat exchanger at the rear side of said fan blower, wherein said water tank and said water sprayer are at the bottom and top of said evaporative heat exchanger, respectively, and wherein said water circulation pump is located on the floor of said EVA cooling fan;
2. Evaporative heat exchanger as claimed in 1, comprising:
- a multiplicity of plate type string-screen-fills, each having a pair of vertical-string-screens on both sides of said plate type string-screen-fill, each of said vertical-string-screen having vertical strings separated sufficiently apart from each other, wherein said vertical strings passing through and over semi-circular holes on the frame of said plate type string-screen-fill;
- attachment tabs on said string-screen-fill frame, each of said attachment tabs locating on side surfaces of said string-screen-fill frame for joining said plate type string-screen-fills together side by side, whereby said attachment tabs are joined by aligning said attachment tabs with and inserting into the counterpart tabs of said plate type string-screen-fill to be joined by pressing;
- attachment tabs on said string-screen-fill frame, each of said attachment tabs locating on top and bottom surface of said plate type string-screen-fill frame for piling said plate type string-screen-fills, whereby said attachment tabs are joined by aligning said attachment tabs with and inserting into the counterpart tabs of said plate type string-screen-fill to be joined by pressing.
3. An EVADEW cooling fan, comprising:
- Said evaporative heat exchanger, condensing heat exchanger, said fan blower, said circulation pump, water tank, circulated water sprayer, and tap water sprayer as components of said EVADEW cooling fan, wherein said fan blower, said condensing heat exchanger, and said evaporative heat exchanger are horizontally installed in their consecutive order as described above, wherein said water tank and said circulated water sprayer are at the bottom and top of said evaporative heat exchanger, respectively, and wherein said tap water sprayer and said water circulation pump are at the top of said condensing heat exchanger and on the floor of said EVADEW cooling fan;
4. Condensing heat exchanger as claimed in 3, comprising;
- a multiplicity of plate type string-screen-fills, each having a pair of vertical-string-screens on both sides of said plate type string-screen-fill, each of said vertical-string-screen having 2 times number of vertical strings of said evaporative heat exchanger separated apart from each other, wherein said vertical strings passing through and over semi-circular holes on the frame of said plate type string-screen-fill;
- attachment tabs on said string-screen-fill frame, each of said attachment tabs locating on side surfaces of said string-screen-fill frame for joining said plate type string-screen-fills together side by side, whereby said attachment tabs are joined by aligning said attachment tabs with and inserting into the counterpart tabs of said plate type string-screen-fill to be joined by pressing;
- attachment tabs on said string-screen-fill frame, each of said attachment tabs locating on top and bottom surface of said plate type string-screen-fill frame for piling said plate type string-screen-fills, whereby said attachment tabs are joined by aligning said attachment tabs with and inserting into the counterpart tabs of said plate type string-screen-fill to be joined by pressing.
Type: Application
Filed: Nov 12, 2013
Publication Date: Jul 10, 2014
Inventor: Chong Mook Park (Falls Church, VA)
Application Number: 14/077,381
International Classification: F24F 6/12 (20060101);