WO2007126261A1 - A system for heat recovery from wasted water - Google Patents

A system for heat recovery from wasted water Download PDF

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Publication number
WO2007126261A1
WO2007126261A1 PCT/KR2007/002079 KR2007002079W WO2007126261A1 WO 2007126261 A1 WO2007126261 A1 WO 2007126261A1 KR 2007002079 W KR2007002079 W KR 2007002079W WO 2007126261 A1 WO2007126261 A1 WO 2007126261A1
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WO
WIPO (PCT)
Prior art keywords
water
wasted
pipe
heat exchange
tank
Prior art date
Application number
PCT/KR2007/002079
Other languages
French (fr)
Inventor
Myung Hyuk Yun
Original Assignee
Myung Hyuk Yun
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Myung Hyuk Yun filed Critical Myung Hyuk Yun
Publication of WO2007126261A1 publication Critical patent/WO2007126261A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/02—Domestic hot-water supply systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/12—Heat pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/16—Waste heat
    • F24D2200/20—Sewage water
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

Definitions

  • the present invention relates to a system for heat recovery from wasted water, and more particularly, to a system for heat recovery from wasted water, which can efficiently recover heat from water used in a bathhouse, can be prevented from being inoperable due to the blocking of foreign substances contained in the wasted water, and can be easily maintained and repaired.
  • the present invention provides a system for heat recovery from wasted water, which can maximize the heat recovery efficiency, prevent the heat exchange efficiency from being degraded by foreign substances or soap contained in the wasted water, prevent the damage caused by foreign substances, smoothly discharge accumulated foreign substances to extend its lifetime, and easily inspect and clear foreign substances accumulated by the long-term use.
  • a system for heat recovery from wasted water includes: a was ted- water collection tank (100) connected to a wasted- water inlet pipe (102) through which used water is introduced; a was ted- water heat exchange tank (200) provided separately from the wasted- water collection tank (100) and connected to the wasted- water collection tank (100) through a wasted- water supply pipe (202), the wasted- water heat exchange tank (200) including a heat exchanger (210); and a was ted- water discharge pipe (204) connected to the wasted- water heat exchange tank (200), wherein heat obtained through the heat exchanger (210) is recovered.
  • the wasted-water supply pipe (202) may have one end connected between a middle level of the was ted- water collection tank (100) and a level of the wasted water, and the other end connected to an upper portion of the wasted- water heat exchange tank (200).
  • the system may further include an inverted-U-shaped pipe (206) provided on the uppermost end of the was ted- water discharge pipe (204), wherein the wasted water overflows and is discharged when an inflow of the wasted water exceeds the level of the inverted-U-shaped pipe (206).
  • an inverted-U-shaped pipe (206) provided on the uppermost end of the was ted- water discharge pipe (204), wherein the wasted water overflows and is discharged when an inflow of the wasted water exceeds the level of the inverted-U-shaped pipe (206).
  • the system may further include a distribution pipe (212) disposed in the wasted- water supply pipe (202) of the wasted- water heat exchange tank (200) so as to disperse the wasted water in a horizontal direction.
  • a distribution pipe (212) disposed in the wasted- water supply pipe (202) of the wasted- water heat exchange tank (200) so as to disperse the wasted water in a horizontal direction.
  • the system may further include: a pump (220) and a valve (Vl) connected to the wasted-water discharge pipe 204; a pair of connection pipes (232, 234) disposed in parallel so as to connect the discharge pipe (204) and a lower portion of the was ted- water collection tank (100); and a plurality of valves (V2, V3, V4) connected to the connection pipes (232, 234) and between the connection pipes (232, 234) and the wasted- water discharge pipe (204).
  • a pump (220) and a valve (Vl) connected to the wasted-water discharge pipe 204
  • Vl valve
  • the system may further include a filter box(l 10) with a filter (112) at a connecting portion of the wasted- water inlet pipe (102) and the wasted- water collection tank (100) to filter hairs or foreign substance contained in the waste water.
  • the system may further include a manhole (230) for inspection of the wasted- water exchange tank (200).
  • the wasted- water collection tank 100 and the was ted- water heat exchange tank 200 are separately provided, thereby preventing a large amount of foreign substance from being directly attached to the heat exchanger 210.
  • the high heat exchange efficiency can be maintained.
  • the level of the wasted-water supply pipe 202 is set in such a manner that foreign substances floating in the wasted water collected in the wasted- water collection tank 200 cannot be directly introduced through the wasted- water sup ply pipe 202. Since the filter box 110 is installed in the wasted- water inlet pipe 102, the inflow of foreign substances is maximally prevented. Consequently, the degradation of the heat exchange efficiency can be prevented, and the contamination and frequent cleaning of the wasted- water processing apparatus can be suppressed, thereby reducing the labor required for maintenance.
  • FIG. 1 is a schematic diagram of a system for heat recovery from wasted water according to an embodiment of the present invention.
  • FIG. 2 is a front view of the system illustrated in Fig. 1.
  • FIG. 3 is a plan view of the system illustrated in Fig. 1.
  • Fig. 1 is a schematic diagram of a system for heat recovery from wasted water according to an embodiment of the present invention
  • Fig. 2 is a front view of the system illustrated in Fig. 1
  • Fig. 3 is a plan view of the system illustrated in Fig. 1.
  • the system for heat recovery from wasted water includes a water tank 10 and a heat exchanger 20.
  • the water tank 10 is connected to a water supply pipe 14 through which hot water is supplied to a bathhouse or the like.
  • the heat exchanger 20 is connected to the water tank 10 through a water pipe 12.
  • the heat exchanger 20 is designed in such a manner that heat exchange is performed by a wasted- water heat exchanger 210 and a refrigerant pipe 22 of a wasted- water heat exchanger.
  • the system for heat recovery from wasted water includes a wasted-water collection tank 100 and a wasted- water heat exchange tank 200.
  • the wasted- water collection tank 100 collects wasted water used in a bathhouse or the like.
  • a was ted- water inlet pipe 102 is connected to the wasted- water collection tank 100.
  • the was ted- water heat exchange tank 200 constructed separately from the was ted- water collection tank 100 is connected to the was ted- water collection tank 100 through a wasted- water supply pipe 202.
  • a heat exchanger 210 is installed in the was ted- water heat exchange tank 200. Wasted water that is heat-exchanged in the wasted- water heat exchange tank 200 is discharged through a wasted- water discharge pipe 204.
  • a filter box 110 with a filter 112 is provided at a connecting portion of the wasted- water inlet pipe 102 and the was ted- water collection tank 100.
  • the filter box 110 primarily filters various foreign substances, such as hair, soap and dirt, which are contained in the waste water.
  • the wasted-water supply pipe 202 through which the wasted water collected in the was ted- water collection tank 100 is supplied to the wasted- water heat exchange tank 200 is connected to an upper portion of the wasted- water collection tank 100.
  • the level of the connecting portion of the wasted- water supply pipe 202 is set to be higher than half the height of the wasted- water collection tank 100 and to be lower than the maximum level of the wasted water.
  • the connecting portion of the wasted- water supply pipe 202 is disposed below the floating level of the foreign substance.
  • the wasted- water supply pipe 202 is connected to the upper portion of the wasted- water heat exchange tank 200 such that the wasted water flows downward while being cooled slowly at the upper portion.
  • a distribution pipe 212 with a plurality of outlet holes 213 extends in a transverse direction and is connected to an inlet port of the wasted- water supply pipe 202 connected to the wasted- water heat exchange tank 200, so that the introduced wasted water is dispersed uniformly over the entire heat exchanger 210.
  • a distribution pipe 214 with a plurality of inlet holes 215 is connected to the connecting portion of the wasted- water discharge pipe 204 connected to the lower portion of the wasted- water heat exchange tank 200, so that the wasted water heat-exchanged in the wasted- water heat exchange tank 200 can be uniformly discharged. Therefore, it is possible to prevent the discharge of the wasted water that is not sufficiently heat- exchanged due to its rapid discharge.
  • a pump 220 and a valve Vl are connected to the middle of the wasted- water discharge pipe 204.
  • An inverted-U-shaped pipe 206 is connected to an end of the wasted- water discharge pipe 204.
  • the wasted- water discharge pipe 204 is connected to a sump 240.
  • the inverted-U-shaped pipe 206 determines a level of the wasted water that flows in the lower portions of the was ted- water collection tank 100 and the wasted- water heat exchange tank 200. When the level of the wasted water in the tanks is lower than the level of the inverted-U-shaped pipe 206, the waster water contained in the wasted-water discharge pipe 204 is not discharged unless a separate pumping operation is performed.
  • the wasted water overflows from the inverted-U-shaped pipe 206 and is then discharged to the sump 240.
  • connection pipes 232 and 234 are connected in parallel between the wasted- water discharge pipe 204 and the lower portion of the wasted- water collection tank 100.
  • Valves V2 and V3 are connected to the connection pipes 232 and 234, respectively.
  • Another valve V4 is connected to the wasted- water discharge pipe 204 between the connecting portions of the connection pipes 232 and 234. Therefore, the wasted water that is heat-exchanged in the wasted- water heat exchange tank 200 is circulated to the wasted- water collection tank 100 through the wasted- water discharge pipe 204 and the connection pipe 232.
  • the wasted water is circulated between the was ted- water collection tank 100 and the was ted- water heat exchange tank 200 until heat is sufficiently recovered from the wasted water.
  • the level of the inverted-U-shaped pipe 206 is set higher than that of the wasted- water supply pipe 202, such that the wasted water can be circulated between the was ted- water collection tank 100 and the wasted- water heat exchange tank 200 in such a state that the wasted water is not discharged.
  • the wasted water may be discharged from the wasted- water collection tank 100 through the connection pipe 234 and the inverted-U-shaped pipe 206, or may be discharged directly through the wasted-water discharge pipe 204 and the valve V4.
  • the inflow of the wasted water increases in any cases. Therefore, the wasted water is finally discharged only when the level of the wasted water is higher than that of the inverted-U-shaped pipe 206. As a result, it is possible to prevent imperfect heat recovery caused by unnecessary discharge of the wasted water.
  • the wasted water filtered in the wasted- water collection tank 100 is supplied to the heat exchange tank 200, foreign substances are not completely removed from the wasted water. Therefore, it is hard to prevent foreign substance from being accumulated in the wasted- water heat exchange tank 200 during the long-term use. In this case, the accumulation of foreign substances in the heat exchanger 210 degrades the heat exchange efficiency. Therefore, in order to clean the heat exchanger 210, the valves V2 and V3 are closed and the pump 220 is operated to forcibly discharge the wasted water within the wasted- water heat exchange tank 200 through the wasted- water discharge pipe 204. Then, a manhole 230 for inspection of the wasted- water heat exchange tank 200 is opened so taht an operator enters the wasted-water heat exchange tank 200 and cleans it.
  • An overflow pipe 126 is connected to the upper portion of the wasted- water collection tank 100 and is used to rapidly discharge the wasted water that is excessively introduced, or to remove foreign substances floating in the upper portion of the wasted water.
  • Discharge pipes 128 and 228 are connected to the lower ends of the wasted- water collection tank 100 and the wasted- water heat exchange tank 200, respectively. In some cases, the waster water contained in the tanks is directly discharged to the outside through the discharge pipes 128 and 228.
  • the heat recovered in the heat exchanger 210 of the wasted- water heat exchanger is circulated to the heat exchanger 20 through the refrigerant pipe 22 and the compressor 30 and heats the water circulated through the water pipe 12 of the water tank 10.
  • the above-described embodiments of the present invention are shown and described only for illustrative purposes. The heat recovery can be achieved in various ways without departing from the spirit and scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

Provided is a system for heat recovery from wasted water, which can efficiently recover waste heat, can be prevented from being blocked by foreign substances contained in the wasted water, and can be easily maintained and repaired. The system includes: a wasted- water collection tank (100) connected to a wasted- water inlet pipe (102) through which used water is introduced; a wasted-water heat exchange tank (200) provided separately from the wasted- water collection tank (100) and connected to the wasted- water collection tank (100) through a wasted- water supply pipe (202), the wasted- water heat exchange tank (200) including a heat exchanger (210); and a wasted- water discharge pipe (204) connected to the wasted- water heat exchange tank (200), wherein heat obtained through the heat exchanger (210) is recovered.

Description

Description A SYSTEM FOR HEAT RECOVERY FROM WASTED WATER
Technical Field
[1] The present invention relates to a system for heat recovery from wasted water, and more particularly, to a system for heat recovery from wasted water, which can efficiently recover heat from water used in a bathhouse, can be prevented from being inoperable due to the blocking of foreign substances contained in the wasted water, and can be easily maintained and repaired. Background Art
[2] In facilities such as a bathhouse where hot water is used, the temperature of wasted water is approximately 20-300C. Systems for heat recovery from wasted water have been introduced. In such conventional systems, while wasted water is cooled during heat exchange with water in order for heat recovery, soap or detergent contained in the wasted water is solidified and thus is attached to a heat exchange pipe, thereby degrading the heat exchange efficiency. In addition, conventional wasted- water heat exchangers are designed in such a manner that wasted water is introduced from a lower portion of the heat exchange tank and discharged to an upper portion thereof in order to increase a retention time of wasted water within the heat exchange tank. If an inflow of the wasted water increases, the temperature becomes relatively high and thus the wasted water is discharged in such a state that heat is not sufficiently recovered from the wasted water remaining in the upper portion of the tank. Therefore, heat recovery cannot be sufficiently achieved. Further, in the conventional systems for heat recovery from wasted water, foreign substances are easily accumulated in the heat recovery tank. However, there is no means for effectively discharging the accumulated foreign substances. Therefore, the conventional systems having the foreign substances accumulated therein have low durability because they are unusable and thus discarded. Disclosure of Invention
Technical Problem
[3] The present invention provides a system for heat recovery from wasted water, which can maximize the heat recovery efficiency, prevent the heat exchange efficiency from being degraded by foreign substances or soap contained in the wasted water, prevent the damage caused by foreign substances, smoothly discharge accumulated foreign substances to extend its lifetime, and easily inspect and clear foreign substances accumulated by the long-term use. Technical Solution
[4] According to an aspect of the present invention, a system for heat recovery from wasted water includes: a was ted- water collection tank (100) connected to a wasted- water inlet pipe (102) through which used water is introduced; a was ted- water heat exchange tank (200) provided separately from the wasted- water collection tank (100) and connected to the wasted- water collection tank (100) through a wasted- water supply pipe (202), the wasted- water heat exchange tank (200) including a heat exchanger (210); and a was ted- water discharge pipe (204) connected to the wasted- water heat exchange tank (200), wherein heat obtained through the heat exchanger (210) is recovered.
[5] Preferably, the wasted-water supply pipe (202) may have one end connected between a middle level of the was ted- water collection tank (100) and a level of the wasted water, and the other end connected to an upper portion of the wasted- water heat exchange tank (200).
[6] Preferably, the system may further include an inverted-U-shaped pipe (206) provided on the uppermost end of the was ted- water discharge pipe (204), wherein the wasted water overflows and is discharged when an inflow of the wasted water exceeds the level of the inverted-U-shaped pipe (206).
[7] Preferably, the system may further include a distribution pipe (212) disposed in the wasted- water supply pipe (202) of the wasted- water heat exchange tank (200) so as to disperse the wasted water in a horizontal direction.
[8] Preferably, the system may further include: a pump (220) and a valve (Vl) connected to the wasted-water discharge pipe 204; a pair of connection pipes (232, 234) disposed in parallel so as to connect the discharge pipe (204) and a lower portion of the was ted- water collection tank (100); and a plurality of valves (V2, V3, V4) connected to the connection pipes (232, 234) and between the connection pipes (232, 234) and the wasted- water discharge pipe (204).
[9] Preferably, the system may further include a filter box(l 10) with a filter (112) at a connecting portion of the wasted- water inlet pipe (102) and the wasted- water collection tank (100) to filter hairs or foreign substance contained in the waste water.
[10] Preferably, the system may further include a manhole (230) for inspection of the wasted- water exchange tank (200).
Advantageous Effects
[11] In the system for heat recovery from wasted water discharged from the facilities such as a bathhouse where a large amount of hot water is used, the wasted- water collection tank 100 and the was ted- water heat exchange tank 200 are separately provided, thereby preventing a large amount of foreign substance from being directly attached to the heat exchanger 210. As a result, the high heat exchange efficiency can be maintained. In addition, the level of the wasted-water supply pipe 202 is set in such a manner that foreign substances floating in the wasted water collected in the wasted- water collection tank 200 cannot be directly introduced through the wasted- water sup ply pipe 202. Since the filter box 110 is installed in the wasted- water inlet pipe 102, the inflow of foreign substances is maximally prevented. Consequently, the degradation of the heat exchange efficiency can be prevented, and the contamination and frequent cleaning of the wasted- water processing apparatus can be suppressed, thereby reducing the labor required for maintenance.
[12] Moreover, since the wasted water introduced into the wasted- water heat exchange tank 200 is uniformly distributed through the distribution pipe 212, the heat exchange efficiency is increased, and the wasted water is not discharged as long as the wasted water is not sufficiently introduced through the inverted-U-shaped pipe 206 installed in the wasted-water discharge pipe 204. Therefore, it is possible to prevent the discharge of the wasted water whose heat is not sufficiently recovered. Brief Description of the Drawings
[13] Fig. 1 is a schematic diagram of a system for heat recovery from wasted water according to an embodiment of the present invention.
[14] Fig. 2 is a front view of the system illustrated in Fig. 1.
[15] Fig. 3 is a plan view of the system illustrated in Fig. 1.
[16] <Description of Reference Numerals in Main Portions of the Drawings>
[17] 10. water tank 20. heat exchanger
[18] 100. wasted- water collection tank 110. filter box
[19] 200. wasted- water heat exchanger 202. wasted- water supply pipe
[20] 204. wasted-water discharge pipe 206. inverted-U-shaped pipe
[21] 210. heat exchanger 212. distribution pipe
Best Mode for Carrying Out the Invention
[22] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a schematic diagram of a system for heat recovery from wasted water according to an embodiment of the present invention, Fig. 2 is a front view of the system illustrated in Fig. 1, and Fig. 3 is a plan view of the system illustrated in Fig. 1. Referring to Figs. 1 to 3, the system for heat recovery from wasted water includes a water tank 10 and a heat exchanger 20. The water tank 10 is connected to a water supply pipe 14 through which hot water is supplied to a bathhouse or the like. The heat exchanger 20 is connected to the water tank 10 through a water pipe 12. The heat exchanger 20 is designed in such a manner that heat exchange is performed by a wasted- water heat exchanger 210 and a refrigerant pipe 22 of a wasted- water heat exchanger.
[23] The system for heat recovery from wasted water includes a wasted-water collection tank 100 and a wasted- water heat exchange tank 200. The wasted- water collection tank 100 collects wasted water used in a bathhouse or the like. A was ted- water inlet pipe 102 is connected to the wasted- water collection tank 100. The was ted- water heat exchange tank 200 constructed separately from the was ted- water collection tank 100 is connected to the was ted- water collection tank 100 through a wasted- water supply pipe 202. A heat exchanger 210 is installed in the was ted- water heat exchange tank 200. Wasted water that is heat-exchanged in the wasted- water heat exchange tank 200 is discharged through a wasted- water discharge pipe 204.
[24] A filter box 110 with a filter 112 is provided at a connecting portion of the wasted- water inlet pipe 102 and the was ted- water collection tank 100. The filter box 110 primarily filters various foreign substances, such as hair, soap and dirt, which are contained in the waste water. The wasted-water supply pipe 202 through which the wasted water collected in the was ted- water collection tank 100 is supplied to the wasted- water heat exchange tank 200 is connected to an upper portion of the wasted- water collection tank 100. The level of the connecting portion of the wasted- water supply pipe 202 is set to be higher than half the height of the wasted- water collection tank 100 and to be lower than the maximum level of the wasted water. In this case, if too close to the maximum level of the wasted water, foreign substances floating on the upper portion of the wasted water are introduced into the wasted- water heat exchange tank 200, degrading the heat exchange efficiency. Hence, it is preferable that the connecting portion of the wasted- water supply pipe 202 is disposed below the floating level of the foreign substance. The wasted- water supply pipe 202 is connected to the upper portion of the wasted- water heat exchange tank 200 such that the wasted water flows downward while being cooled slowly at the upper portion.
[25] A distribution pipe 212 with a plurality of outlet holes 213 extends in a transverse direction and is connected to an inlet port of the wasted- water supply pipe 202 connected to the wasted- water heat exchange tank 200, so that the introduced wasted water is dispersed uniformly over the entire heat exchanger 210. In addition, a distribution pipe 214 with a plurality of inlet holes 215 is connected to the connecting portion of the wasted- water discharge pipe 204 connected to the lower portion of the wasted- water heat exchange tank 200, so that the wasted water heat-exchanged in the wasted- water heat exchange tank 200 can be uniformly discharged. Therefore, it is possible to prevent the discharge of the wasted water that is not sufficiently heat- exchanged due to its rapid discharge.
[26] A pump 220 and a valve Vl are connected to the middle of the wasted- water discharge pipe 204. An inverted-U-shaped pipe 206 is connected to an end of the wasted- water discharge pipe 204. The wasted- water discharge pipe 204 is connected to a sump 240. The inverted-U-shaped pipe 206 determines a level of the wasted water that flows in the lower portions of the was ted- water collection tank 100 and the wasted- water heat exchange tank 200. When the level of the wasted water in the tanks is lower than the level of the inverted-U-shaped pipe 206, the waster water contained in the wasted-water discharge pipe 204 is not discharged unless a separate pumping operation is performed. However, when the inflow of the wasted water increases so that the level of the wasted water exceeds the level of the inverted-U-shaped pipe 206, the wasted water overflows from the inverted-U-shaped pipe 206 and is then discharged to the sump 240.
[27] In addition, a pair of connection pipes 232 and 234 are connected in parallel between the wasted- water discharge pipe 204 and the lower portion of the wasted- water collection tank 100. Valves V2 and V3 are connected to the connection pipes 232 and 234, respectively. Another valve V4 is connected to the wasted- water discharge pipe 204 between the connecting portions of the connection pipes 232 and 234. Therefore, the wasted water that is heat-exchanged in the wasted- water heat exchange tank 200 is circulated to the wasted- water collection tank 100 through the wasted- water discharge pipe 204 and the connection pipe 232. The wasted water is circulated between the was ted- water collection tank 100 and the was ted- water heat exchange tank 200 until heat is sufficiently recovered from the wasted water. Preferably, the level of the inverted-U-shaped pipe 206 is set higher than that of the wasted- water supply pipe 202, such that the wasted water can be circulated between the was ted- water collection tank 100 and the wasted- water heat exchange tank 200 in such a state that the wasted water is not discharged.
[28] Meanwhile, the wasted water may be discharged from the wasted- water collection tank 100 through the connection pipe 234 and the inverted-U-shaped pipe 206, or may be discharged directly through the wasted-water discharge pipe 204 and the valve V4. However, the inflow of the wasted water increases in any cases. Therefore, the wasted water is finally discharged only when the level of the wasted water is higher than that of the inverted-U-shaped pipe 206. As a result, it is possible to prevent imperfect heat recovery caused by unnecessary discharge of the wasted water.
[29] Although the wasted water filtered in the wasted- water collection tank 100 is supplied to the heat exchange tank 200, foreign substances are not completely removed from the wasted water. Therefore, it is hard to prevent foreign substance from being accumulated in the wasted- water heat exchange tank 200 during the long-term use. In this case, the accumulation of foreign substances in the heat exchanger 210 degrades the heat exchange efficiency. Therefore, in order to clean the heat exchanger 210, the valves V2 and V3 are closed and the pump 220 is operated to forcibly discharge the wasted water within the wasted- water heat exchange tank 200 through the wasted- water discharge pipe 204. Then, a manhole 230 for inspection of the wasted- water heat exchange tank 200 is opened so taht an operator enters the wasted-water heat exchange tank 200 and cleans it.
[30] An overflow pipe 126 is connected to the upper portion of the wasted- water collection tank 100 and is used to rapidly discharge the wasted water that is excessively introduced, or to remove foreign substances floating in the upper portion of the wasted water. Discharge pipes 128 and 228 are connected to the lower ends of the wasted- water collection tank 100 and the wasted- water heat exchange tank 200, respectively. In some cases, the waster water contained in the tanks is directly discharged to the outside through the discharge pipes 128 and 228.
[31] As described above, the heat recovered in the heat exchanger 210 of the wasted- water heat exchanger is circulated to the heat exchanger 20 through the refrigerant pipe 22 and the compressor 30 and heats the water circulated through the water pipe 12 of the water tank 10. The above-described embodiments of the present invention are shown and described only for illustrative purposes. The heat recovery can be achieved in various ways without departing from the spirit and scope of the present invention.
[32]

Claims

Claims
[1] A system for heat recovery from wasted water, comprising: a was ted- water collection tank (100) connected to a was ted- water inlet pipe (102) through which used water is introduced; a wasted- water heat exchange tank (200) provided separately from the wasted- water collection tank (100) and connected to the wasted- water collection tank (100) through a wasted- water supply pipe (202), the was ted- water heat exchange tank (200) including a heat exchanger (210); and a wasted- water discharge pipe (204) connected to the wasted- water heat exchange tank (200), wherein heat obtained through the heat exchanger (210) is recovered.
[2] The system of claim 1, wherein the wasted- water supply pipe (202) has one end connected between a middle level of the was ted- water collection tank (100) and a level of the wasted water and the other end connected to an upper portion of the wasted- water heat exchange tank (200).
[3] The system of claim 1 or 2, further comprising an inverted-U-shaped pipe (206) provided on the uppermost end of the wasted-water discharge pipe (204), wherein when an inflow of wasted water exceeds the level of the inverted- U-shaped pipe (206), the wasted water overflows and is discharged.
[4] The system of claim 1 or 2, further comprising a distribution pipe (212) disposed in the wasted- water supply pipe (202) of the wasted- water heat exchange tank (200) so as to disperse the wasted water in a horizontal direction.
[5] The system of claim 1 or 2, further comprising: a pump (220) and a valve (Vl) connected to the wasted- water discharge pipe
204; a pair of connection pipes (232, 234) disposed in parallel so as to connect the discharge pipe (204) and a lower portion of the wasted- water collection tank
(100); and a plurality of valves (V2, V3, V4) connected to the connection pipes (232, 234) and between the connection pipes (232, 234) and the wasted- water discharge pipe (204).
[6] The system of claim 1 or 2, further comprising a filter box (110) with a filter
(112) at a connecting portion of the wasted- water inlet pipe (102) and the wasted- water collection tank (100) to filter hairs or foreign substances contained in the waste water.
[7] The system of claim 1 or 2, further comprising a manhole (230) for inspection of the wasted-water exchange tank (200).
PCT/KR2007/002079 2006-04-28 2007-04-27 A system for heat recovery from wasted water WO2007126261A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2006-0038567 2006-04-28
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