KR101968254B1 - Apparatus for sterilization of a biofilm in evaporator for an efficiency of a heat exchange and a method thereof - Google Patents

Abstract

The present invention is to maintain the cleanliness of the thermo-hygrostat, and more specifically, in the condensate condensation condensed on the surface of the evaporator during cooling operation, the environment suitable for the growth of fine dust and microorganisms in the air to form a biofilm It becomes symbiosis.
To this end, in the present invention, in order to add a method and hydrophobicity of the aluminum fin at the top or side of the evaporator, spraying the cleaning liquid having an antioxidant and an alkaline component selectively without causing physical and chemical defects of the coated evaporating fin, Reacting with the biofilm layer, it is characterized by consisting of the step of washing the finished biofilm layer and the washing liquid.

Description

Apparatus for sterilization of a biofilm in evaporator for an efficiency of a heat exchange and a method

The present invention relates to an apparatus for sterilizing and cleaning an evaporator for maintaining heat exchange efficiency of a thermo-hygrostat and a method for sterilizing and washing the same.

 Thermo-hygrostat is used for preservation and maintenance of equipment, computer media, public records, library, cultural property, etc. of computer room, and is leading the future industrial fields such as semiconductor, pharmaceutical, and life science that require precise temperature and humidity equilibrium and future agriculture. It is used in the field of smart farming.

Air-conditioning refrigeration products such as thermo-hygrostats, household air-conditioners, and vehicle air-conditioners are equipment that manages air quality using air, water, and heat. Especially, thermo-hygrostats are characterized by temperature, humidity, airflow, and cleanliness. have.

However, as a common problem of these devices, odor, bacterial contamination, and dumping, which dumps fine dust collected at the same time, are emerging as the biggest problems of cleanliness management.

Microbial propagation is possible in thermo-hygrostats because organisms that circulate in the air to condensate on the evaporator surface are attached to the surface by proteinaceous appendages and the organic molecules that are already adsorbed on the surface provide nutrients. It is known to proliferate by producing a substance called it.

According to the previous research, volatile organic compounds (MVOCs) produced by microorganisms breeding in the evaporator are recognized as a major odor causing substance. Organic substances from outside are adsorbed on the evaporator surface and decay. Odors are reported to occur with corrosion products.

When the microorganisms attached to the evaporator are formed and proliferated and fixed on the surface of the evaporator by the extracellular polymer material secreted in the metabolic process, this is called a biofilm, and the heat exchange efficiency required in the design of the thermo-hygrostat is achieved by the biofilm. It is obvious that energy consumption is difficult and increases in proportion to its thickness.

According to a prior study (Non-Patent Document 1), the thermal conductivity of the biofilm is 0.6 (W / m.K) and the thermal conductivity of aluminum to 237 (W / m.K) must be removed as a direct cause to lower the heat exchange efficiency.

KR 10-0775614 B1, Cleaning device for air conditioner evaporator (released Nov. 05, 2007)

 Progress in Natural Science Volume 18, Issue 9, 10 September 2008, Pages 1049-1056  Park, Sang Jun; Oh, Young Hwan; Jo, Bo Yeon; Lee, Jae Shin; Kim, Eui Yong; Investigation on the Cause of Malodor through the Reproduction of Chemicals / Korean Society for Biotechnology and Bioengineering Journal 29 (5): 392-398 (2014)  Hemodialysis Catheter Heat Transfer for Biofilm Prevention and Treatment / ASAIO J. Authomanuscript; available in PMC 2017 Jan 1  Reducedvirulence is an important characteristic of bio ￠ lminfection of Streptococcus suis / Henan University of Science and Technology, Luoyang, China

As described above, the evaporator of the thermo-hygrostat generates volatile organic compounds and the like by the microorganisms adsorbed and multiplies therein, and gives off odors, and the organic substances introduced from the outside are adsorbed by the evaporator and decay. In addition, the heat exchange efficiency of the thermo-hygrostat decreases, and in order to prevent this, it is necessary to remove the biofilm generated by the microorganisms propagating on the surface of the evaporator.

Unlike air conditioners, condensate condensed water remains on evaporation fins in order to maintain constant temperature and humidity in all four seasons unlike air conditioners. Therefore, contaminants such as external bacteria and fine dusts exist.

The present invention relates to a biofilm removal and sterilization washing apparatus of a thermo-hygrostat evaporator, comprising: installing a plurality of perforations on the bottom surface of the upper frame of the evaporator; After making the washing water by using the water pressure of the water supply pipe and the control valve flows downward from the top of the evaporator fin to react with the attached biofilm; Going through the process of washing this; In particular, the cleaning liquid is a solid detergent obtained by dehydrating a mixture mainly composed of liquid sodium silicate and a surfactant under reduced pressure at room temperature and solidifying at 90 ° for 10 hours; It gradually melts in the water supplied inside the tank to form a cleaning liquid; Supplying the cleaning liquid to the surface of the evaporator and reacting with the contaminants for a predetermined time; An apparatus for cleaning a contaminant at a water pressure of 1.0-3.0 kgf / cm 2 by opening a control valve.

The present invention maintains the original designed heat exchange capacity by periodically cleaning the biofilm and pollutants with their own production of washing water having strong penetration, interfacial activity and degradability, thereby preventing unnecessary energy consumption due to heat exchange loss and bacterial growth. There is an effect of preventing the indoor air pollution by.

1 shows a schematic diagram of the invention.
2 shows the thickness of the biofilm and the heat exchange loss rate.
3 illustrates the shape of the plate for generating turbulence.
Figure 4 shows a flow chart for controlling the washing mode.
5 is a picture of the cooling fins before use.
Figure 6 is a picture taken before washing the cooling fins used for one month.
Figure 7 is a photograph taken after washing the cooling fins used for one month.
Figure 8 is a picture taken before washing the cooling fins used for three months.
9 is a photograph taken after washing the cooling fins used for three months.
10 is a photograph taken under a microscope before washing the cooling fins used for 10 days.
Figure 11 is a photograph taken under a microscope after washing the cooling fins used for 10 days.
12 is a photograph taken under a microscope before washing the cooling fins used for 20 days.
Figure 13 is a photograph taken under a microscope after washing the cooling fin used for 20 days.
14 is a photograph taken under a microscope before washing the cooling fins used for one month.
Figure 15 is a photograph taken under a microscope after washing the cooling fins used for one month.

With reference to the accompanying drawings will be described in detail the evaporator biofilm sterilization and cleaning apparatus and its sterilization and cleaning method for maintaining the heat exchange efficiency of the constant temperature and humidity of the present invention. The drawings introduced below are provided as examples to ensure that the spirit of the present invention can be fully conveyed to those skilled in the art.

Therefore, the present invention is not limited to the drawings presented below and may be embodied in other forms. Also, like reference numerals denote like elements throughout the specification.

In this case, unless there is another definition in the technical terms and scientific terms used, it has the meaning commonly understood by those of ordinary skill in the art to which the invention belongs, and the gist of the invention in the following description and the accompanying drawings. The description of well-known functions and configurations that may unnecessarily obscure them will be omitted.

An embodiment according to the present invention will be described with reference to FIG. 1.

The evaporator cleaning device has a 3-way valve 10 installed on one side of the water supply line 1 between the first line L1 of the washing liquid generating tank 20 and the second washing line 2 L2, and the evaporator. The upper frame 30 of the washing liquid and the washing water supply port 31 is provided.

The washing liquid generating tank 20 includes a solid detergent which dehydrates a mixture mainly composed of liquid sodium silicate and a synthetic surfactant at room temperature under reduced pressure, dried at 90 ° C. for 10 hours, and solidifies to a predetermined shape. The solid detergent 21 is gradually dissolved, and the detergent is re-created in the tank, thereby solving the problem of constantly replenishing the cleaning liquid as in the prior art.

Turbulent generation plate 32 is provided on the front surface of the washing liquid and the water supply port 31 of the upper frame 30 of the evaporator 34, and a plurality of perforations (the bottom surface of the upper frame 30) 33) is formed so that the washing liquid and the washing liquid are evenly delivered to the front surface of the evaporator fin (34).

The turbulence generation plate may be inclined obliquely, but may be in the range of 30 to 60 degrees, and preferably at 45 degrees.

In order to solve the problem that the lower end of the plate for turbulence generation is concentrated in the center of the plate 32 in the water supply port 31 as shown in Figure 2 is folded in an arc shape on the bottom to form a turbulence evenly in the center and both sides It is configured to supply enough to the opposite side against the water inlet.

The embodiment of the present invention will be described in more detail so that those skilled in the art can easily understand the 3Way valve 10. The 3Way valve 10 is normally closed, and when the washing cycle reaches a preset period and time set in the controller or enters the manual cleaning mode, the 3Way valve The flow path of the first line is opened by (10) so that the cleaning liquid generated in the cleaning liquid generating tank 20 is supplied through the water supply port 31 by water pressure for a predetermined time.

At this time, the cleaning liquid supplied through the water inlet 31 is converted into a turbulent flow in the turbulence generating plate 32 through the plurality of punching holes 33 installed on the bottom surface of the upper frame 30 evaporator fin 34 Is supplied dispersedly on the surface.

The cleaning liquid supplied to the surface of the evaporator fin 34 requires a time for activating the interface between the biofilm layer of the contaminated fin and the contaminant, and the equipment needs to be shut down so that the cleaning liquid does not scatter for a predetermined time.

At this time, the reaction time is determined by the thickness of the contaminant layer and the washing cycle, but preferably about 2-3 minutes in a 10 day cycle.

After the reaction time has elapsed, the 3Way valve 10 opens a second line for flushing the water to flush the contaminated surface of the evaporator fin 34, and generates water and a turbulent flow port 31 of the evaporator upper frame 30 by the water pressure. The laminar flow is converted into turbulent flow in the plate 32 and distributedly supplied to the surface of the evaporator fin 34 through a plurality of perforations 33 installed on the bottom surface of the upper frame 30 to complete the washing.

4 illustrates an example of control for the cleaning mode.

The washing can be set through the control unit and the automatic washing mode which sets the fixed period and time and the manual washing mode which can always wash can be set and change the supply time of washing liquid, reaction time of washing liquid and washing time.

With reference to the above, embodiments of the present invention will be described.

One aspect according to the present invention, the washing solution generating tank 20 on one side of the water supply line (1); A first line (L1) connecting the water supply line (1) and the washing liquid generating tank (20) and connected to a second line (L2); A second line (L2) for directly connecting the water supply line (1) and the water supply port (31); A three-way valve (10) positioned at a branch point of the water supply line (1), the first line (L1) and the second line (L2); A turbulent generation plate 32 installed in front of the water supply port 31 installed in the upper frame 30 of the evaporator fin 34; And a plurality of perforations (33) formed on one side of the upper frame (30) to inject the washing liquid and the washing liquid introduced from the water supply port (31). Device.

Preferably, the washing liquid generation tank 20 includes a solid detergent 21, the solid temperature of the solid detergent 21 is melted in the feed water flowing into the first line (L1) to create a cleaning liquid, characterized in that Evaporator biofilm sterilization and cleaning device for maintaining the humidity exchanger efficiency.

More preferably, the solid detergent 21 may be a detergent that reacts with and washes off any foreign matter such as microorganisms or biofilm or dust.

Still more preferably, the solid detergent 21 is a solid detergent obtained by dehydrating a mixture mainly composed of liquid sodium silicate and a synthetic surfactant at room temperature under reduced pressure, drying at 90 degrees for 10 hours, and solidifying it into a predetermined shape.

Also preferably, the turbulent generation plate 32 is an evaporator biofilm sterilization and washing apparatus for maintaining a constant temperature and humidity exchanger efficiency, characterized in that inclined 30 to 60 degrees.

In another preferred embodiment, the turbulent generation plate 32 is an evaporator biofilm sterilization and cleaning device for maintaining a constant temperature and humidity exchanger efficiency, characterized in that the lower end is folded in an arc shape.

Alternatively preferably, automatically cleaning at a set time; Manual cleaning to allow regular cleaning; Evaporator biofilm sterilization and washing apparatus for maintaining a constant temperature and humidity exchanger efficiency, characterized in that it further comprises a; control unit 40 to enable the setting and change of the supply time, reaction time and washing time of the cleaning liquid.

In addition, preferably, a plurality of perforations 33 formed on one side of the upper frame 30 to inject the washing liquid and the cleaning liquid introduced from the water supply port 31, the one side of the frame 30 Evaporator biofilm sterilization and washing apparatus for maintaining a constant temperature and humidity exchanger heat exchange efficiency, characterized in that the elongated injection nozzle is provided, the injection nozzle is a plurality of perforations.

In addition, another aspect according to the present invention, step (S1) that the water supply flows into the water supply line (1); Opening the first line (L1) connecting the cleaning solution generating tank (20) from the water supply line (1) to a 3 way valve (S2); Generating a cleaning liquid by reacting the water supply flowing through the first line (L1) in the cleaning liquid generating tank (20) with the solid cleaning agent (21) in the cleaning liquid generating tank (S3); In step S4, the generated washing liquid flows into the water supply port 31; Spraying the cleaning liquid introduced from the water supply port 31 to the evaporator fin 34 (S5); Reacting the sprayed cleaning liquid and the foreign matter attached to the surface of the evaporator fin (34) (S6); Opening a second line (L2) directly connected to the water supply port (31) from the water supply line (1) with a 3 way valve (S7); A step (S8) in which the washing liquid introduced into the water inlet 31 is injected into the evaporator fin 34; Washing the cleaning liquid on the surface of the evaporator fin 34 with the washing liquid and the foreign matter reacted with the washing liquid (S9); Closing the 3Way valve 10 (S10); evaporator biofilm sterilization and washing method for maintaining a constant temperature and humidity exchanger efficiency.

Preferably step (S1) that the water supply flows into the water supply line (1); before

In step S4, the generated washing liquid flows into the water supply port 31; Reacting the sprayed cleaning liquid and the foreign matter attached to the surface of the evaporator fin (S6); And washing (S9) the washing liquid and the foreign substances reacted with the washing liquid on the surface of the evaporator fin with the flushing liquid; setting or modifying the time required in the evaporator fin (S0). Biofilm sterilization and washing method.

A step (S1) of supplying water into the water supply line (S1) and introducing the generated cleaning solution into a water supply port (S4); Reacting the sprayed cleaning liquid and foreign matter attached to the surface of the evaporator fin (S6); And the specific embodiment of the time required in the step (S9) of washing the washing liquid and the foreign matter reacted with the washing liquid on the surface of the evaporator with the washing liquid is as follows.

In the step (S1) in which the water supply flows into the water supply line (1), it is preferable to supply 0.5 to 6 minutes at 2 to 20 L / min, more preferably at 10 L / min for 3 minutes.

In the step (S4) in which the generated cleaning solution flows into the water supply port 31, it is preferable to supply 0.1 to 2 minutes at 0.5 to 5 L / min, more preferably at 1 L at 3 L / min. .

In the step (S6) in which the sprayed washing liquid and the foreign matter attached to the surface of the evaporator is reacted, it is preferable to allow the reaction for 1 to 10 minutes, and more preferably, to react for 5 minutes.

In the step (S9) of washing the washing liquid and the foreign substances reacted with the washing liquid on the surface of the evaporator fin with the washing liquid, washing with water for 1 to 10 minutes is preferred, and more preferably for 3 minutes.

The flow rate and supply time of the flushing liquid are exemplified based on the heat transfer area of the heat exchanger (refering to the total area of the heat exchanger transferring heat) 1 m ² , and the flow rate and supply time should be adjusted in proportion to the heat transfer area.

5 to 15 show examples before and after each cleaning cycle in order to set an ideal cleaning cycle of the evaporator. The surface contamination of the evaporator is analyzed to be a cause of reducing heat exchange capacity and wasting energy by unnecessary operation.

According to the embodiment, the cleaning cycle shows that the evaporator fin is completely decontaminated after 10 days of washing, and after 20 days or more, fine contaminants remain after washing, and the cumulative accumulation of heat exchange capacity is determined by the design value. It shows the possibility of loss.

1: water supply line
10: 3Way Valve
20: washing liquid generating tank
21: solid detergent
30: evaporator upper frame
31: water inlet
32: plate for generating turbulent
33: A number of other tools
34: evaporator pin
40: control unit

Claims (7)

Washing liquid generating tank 20 on one side of the water supply line (1);
A first line (L1) connecting the water supply line (1) and the washing liquid generating tank (20) and connected to a second line (L2);
A second line (L2) for directly connecting the water supply line (1) and the water supply port (31);
A three-way valve (10) positioned at a branch point of the water supply line (1), the first line (L1) and the second line (L2);
A turbulent generation plate 32 installed in front of the water supply port 31 installed in the upper frame 30 of the evaporator fin 34; And
Evaporator biofilm sterilization and cleaning apparatus for maintaining a constant temperature and humidity exchanger efficiency formed of a plurality of perforations 33 formed on one side of the upper frame 30 to spray the washing liquid and the cleaning liquid introduced from the water supply port 31 . The method of claim 1,
The washing liquid generating tank 20 includes a solid detergent 21, and maintains a constant temperature / humidity heat exchanger efficiency, characterized in that the solid detergent 21 is dissolved in a feed water flowing into the first line L1 to form a washing liquid. Evaporator Biofilm Sterilization and Washing System. The method of claim 1,
The turbulent generation plate 32 is an evaporator biofilm sterilization and cleaning device for maintaining a constant temperature and humidity exchanger efficiency, characterized in that inclined 30 to 60 degrees. The method of claim 1,
Evaporator biofilm sterilization and washing apparatus for maintaining the heat exchange efficiency of the thermo-hygrostat, characterized in that the turbulent (32) for generating plate 32, the lower end is folded in an arc shape. The method of claim 1,
To automatically wash at a set time; Manual cleaning to allow regular cleaning; Evaporator biofilm sterilization and cleaning apparatus for maintaining a constant temperature and humidity exchanger efficiency, characterized in that it further comprises; control unit 40 to enable the setting and change of the supply time, reaction time and washing time of the cleaning liquid. Supplying water to the water supply line 1 (S1);
Opening the first line (L1) connecting the cleaning solution generating tank (20) from the water supply line (1) to a 3 way valve (S2);
Generating a cleaning liquid by reacting the water supply flowing through the first line (L1) in the cleaning liquid generating tank (20) with the solid cleaning agent (21) in the cleaning liquid generating tank (S3);
In step S4, the generated washing liquid flows into the water supply port 31;
Spraying the cleaning liquid introduced from the water supply port 31 to the evaporator fin 34 (S5);
Reacting the sprayed cleaning liquid and the foreign matter attached to the surface of the evaporator fin (34) (S6);
Opening a second line (L2) directly connected to the water inlet (31) from the water supply line (1) with a 3 way valve (S7);
A step (S8) in which the washing liquid introduced into the water inlet 31 is injected into the evaporator fin 34;
Washing the cleaning liquid on the surface of the evaporator fin 34 with the washing liquid and the foreign matter reacted with the washing liquid (S9);
Closing the 3Way valve (10) (S10); Evaporator biofilm sterilization and washing method for maintaining a constant temperature and humidity exchanger efficiency. The method of claim 6,
Supplying water to the water supply line (1) (S1); before
In step S4, the generated washing liquid flows into the water supply port 31;
Reacting the sprayed cleaning liquid and foreign matter attached to the surface of the evaporator fin (S6); And
Evaporator bio for maintaining a constant temperature and humidity exchanger efficiency, comprising the step (S0) of washing or washing the cleaning solution and the foreign matter reacted with the water on the surface of the evaporator fin with the washing liquid (S0) Film sterilization and cleaning method.

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