FR2856675A1 - Plant pasteurizing liquids to remove microorganisms, employs heat exchange between inlet flow and return flow from heater - Google Patents

Plant pasteurizing liquids to remove microorganisms, employs heat exchange between inlet flow and return flow from heater Download PDF

Info

Publication number
FR2856675A1
FR2856675A1 FR0307918A FR0307918A FR2856675A1 FR 2856675 A1 FR2856675 A1 FR 2856675A1 FR 0307918 A FR0307918 A FR 0307918A FR 0307918 A FR0307918 A FR 0307918A FR 2856675 A1 FR2856675 A1 FR 2856675A1
Authority
FR
France
Prior art keywords
water
installation
plant
heat
heater
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
FR0307918A
Other languages
French (fr)
Inventor
Jacques Bernier
Original Assignee
Jacques Bernier
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 Jacques Bernier filed Critical Jacques Bernier
Priority to FR0307918A priority Critical patent/FR2856675A1/en
Publication of FR2856675A1 publication Critical patent/FR2856675A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES
    • A61L2/00Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/02Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
    • A61L2/04Heat
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/02Temperature
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/04Disinfection

Abstract

A liquid (E) is heated in a heat exchanger (10) primary circuit, then enters a vessel (12) with a heater. The temperature reached destroys bacteria and viruses. The liquid is then cooled in a secondary circuit of the heat exchanger. It is then optionally cooled further, before distribution (S). An electrical resistance heater (16) or heat exchanger for any type of energy supply, is provided in the vessel (12). Thermostatic temperature control is applied. The cooler (58) is a heat pump. The water is from hot mains, and is treated to destroy Legionella pneumophilia. The liquid is not potable, e.g. the plant is coupled to the cooling water side of an air cooler. Only part of the flow from the pump circulates in the plant (A). The plant is installed in the circuit of a hot sanitary water main. A valve facilitates installation for treating the contents of a hot water tank.

Description

The present invention relates to an anti-legionellosis, anti-virus and anti-bacterial energy-saving thermal device intended in particular to protect domestic hot water networks and cooling tower networks from infection by legionella.
Devices are already known for sterilizing domestic hot water networks by injecting chemicals; these systems cannot be used permanently because they require rinsing the circuits before using hot water.
Systems are also known which make it possible to raise the hot water distribution temperature above 60 [deg] C, the bacteria are effectively destroyed by heat but the process is very costly in energy because the distribution of hot water sanitary and any thermal holding loop is at high temperature; this process can also not be used with solar hot water or thermodynamic production and also presents significant risks of burns.
It is generally an object of the invention to provide a thermal device allowing the destruction of legionella while distributing the loop water at a temperature of the order of 45 [deg] C and consuming only 3 at 15% of the energy to temporarily heat the loop water from 45 [deg] C to 70.C the process does not have the faults of known installations.
It is in particular an object of the invention to provide a very compact device making it possible to thermally sterilize domestic hot water to be distributed to the various draw-off points.
It is also an object of the invention to provide a device preventing the proliferation of legionella which can adapt to any type of production of thermodynamic, solar, fuel oil, gas or electric sanitary hot water while not imposing temperatures storage above 50 [deg] C.
It is also an object of the invention to propose a device making it possible to pasteurize continuously the water circulating in the circulation circuits for sanitary hot water or for cooling with air coolers.
The invention will be better understood from the following description given by way of example and with reference to the appended drawings in which:
Figure 1 is a diagram of an installation according to the invention.
. FIG. 2 represents an exemplary embodiment of the invention. FIG. 3 represents a system according to the invention with the use of a heat pump for energy recovery and heating, * FIG. 4 is a diagram representing the heat fluxes and the evolution of the temperature levels in the devices according to the invention.
* Figure 5 is an example of mounting an installation according to the invention on an atmospheric air cooler circuit.
Figure 6 is an example of mounting an installation according to the invention on a domestic hot water circulation circuit, Figure 7 shows the system according to the invention with an insulated jacket. An installation according to the invention in FIG. 1 comprises an inlet (E) for water to be pasteurized and an outlet for heat-treated water (S). The system comprises a heat exchanger (10) comprising a primary inlet pipe (11 ) and a primary outlet pipe (13) the water to be treated is admitted into the exchanger at (11) then reheated in the exchanger to exit at (13), the water is then admitted into a preheater (12) comprising a heating element (16) making it possible to heat the water to a temperature above 70 [deg] C thus making it possible to destroy the legionella, the heater (12) could simply be an electric water heater or a tank with heat exchanger from any type of energy. A period of passage of a few seconds at 70 [deg] C makes it possible to destroy the bacteria. A temperature probe (17) is used to regulate the temperature of the system. The water at 70 [deg] C is then directed through the inlet pipe (14) in the secondary of the exchanger (10). The water is then cooled in the exchanger to exit through the tube (15) in order to be distributed in (S). The heat transferred by the exchanger makes it possible to reduce by more than 90% the energy required to heat the water from its inlet temperature in (E) to 70 [deg] C, the temperature of destruction of legionella. The reduced energy required for heating provided by the heating element (16) can either be provided by an electrical resistance, or by an exchanger heated directly or indirectly by an oil, gas or steam boiler or by any other means such as in particular a heat pump, which will be described later.
An installation according to the invention in FIG. 2 comprises a heat exchanger (10) advantageously with brazed plates. The heater (12) will be constituted for example in a steel cylinder into which will be screwed an electrical resistance (16) controlled by a regulating thermostat (17). The volume of the cylinder (12) will be at least equal to the flow of water circulating in the device divided by the few seconds required to destroy the legionella. An air vent (19) will degas the system. As an indication the electrical resistance will have a power of 2000 Watt and the exchanger (10) a power of 18000 Watt, which allows to heat from 45 to 70 [deg] C a total flow of water of 690 liters per hour in consuming only 2000 watts, this device saves 90% of the energy of the loop network.
Figure 3 is a particularly economical and interesting variant of the invention since it uses a heat pump to heat the water and its final cooling. The installation includes an inlet (E) for water to be pasteurized and an outlet for heat-treated water (S). The system comprises a heat exchanger (10) comprising a primary inlet pipe (11) and a primary outlet pipe (52) the water to be treated is admitted into the exchanger at (11) then reheated in the exchanger to come out in (52), the water is then admitted into a tank (50) comprising a condenser (58) making it possible to heat the water to a temperature above 70 [deg] C in order to destroy the legionella. A temperature sensor, not shown, regulates the temperature of the tank (50). The water at 70 [deg] C is then directed by the inlet pipe (51) in the secondary of the exchanger (10) . The water is then cooled in the exchanger to exit through the tubing (53) to be cooled in the evaporator (54) of the heat pump before coming out through the piping (55) to be distributed in (S ). The heat pump consists mainly of the condenser (58), the compressor (56), the evaporator (54) and the expansion valve (57). The working refrigerant of the heat pump will of course be adapted to the high operating temperatures, it could be R-134a or fluids with a higher normal boiling temperature like the substituting fluids of R-113. fundamental interest of the heat pump is to limit very significantly the energy consumption while cooling the liquid to be treated at the end of treatment. As an indication, on a domestic hot water circulation, the following operating conditions of a very efficient installation can be observed: the water is heated free of charge in the exchanger (10) from 45 [deg] C to 67.5 [ deg] C, the condenser (58) then heats it to 70 [deg] C for the time necessary for the destruction of the legionella, the water is then cooled to 47.5 [deg] C in the secondary of the exchanger ( 10), then finally cooled to 45.5 [deg] C in the evaporator (54). The energy consumption of the heat pump, to ensure the treatment described above will only be 400 Watt or 50 times less than with conventional devices and 5 times less than that of the version of the invention with electrical resistance. The heat pump system can also be of the absorption, chemical solid gas, Peltier effect type for small powers, or ejection or other. FIG. 4 is a diagram representing the heat fluxes and the evolution of the temperature levels in the apparatus according to the invention. Reference is made to FIGS. 1 and 4 for the explanation below. The water enters (E) at temperature Te, it heats up in the exchanger (10) from temperature Te to temperature Ter. The water is then brought from temperature Ter to temperature Tsr in the heater ( 12) or the condenser (58) thanks to the thermal contribution of the heating element, it will be noted that Tsr will be higher than the destruction temperature of the bacteria. The water thus heated cools from temperature Tsr to temperature Ts in the secondary of the exchanger (10). The water may be sub-cooled in the case of an installation with a heat pump from the temperature Ts to the temperature Tsc, the water thus treated is then distributed. The heat capacity exchanged (PE) in the exchanger (10) is equal to the mass flow of water multiplied by the mass heat of the water and by the temperature difference Ter-Te. Note that Ter-Te = Tsr-Ts.
The calorific power (PR) of the heater (12) is very minimal relative to the power (PE). The temperature difference caused by the heater (12) allows the exchanger (10) to operate and transfer a very large amount of heat completely free of charge. This will be even more economical of course in the heat pump version.
FIG. 5 is an example of mounting an installation according to the invention on an atmospheric air cooler circuit. The water (Ae) to be cooled, coming for example from an air conditioning circuit, enters the device (A) according to the invention (which may be of the type described in Figures 1 or 3) and after heat treatment is sucked up by the air cooler pump (32) (30). A balancing valve (33) makes it possible to adapt the partial water flow which will enter the device (A). The tank (31) of the air cooler (30) often contains legionella bacteria, the continuous collection and pasteurization of water in the system (A) will prevent the development of bacteria. The cooled water (As) will return to the equipment to be cooled. It should be noted that the heat treatment in the device (A) object of the invention must occasionally be supplemented by a chemical treatment of the water circuit of the air cooler to remove algae among others.
Figure 6 is an example of mounting an installation according to the invention on a domestic hot water circulation circuit. The loop water is admitted into the device (A) by a pump (40). After pasteurization, water comes out through the piping (47). Domestic hot water is produced in a storage tank (41) and is heated by a device (42). Cold water enters the tank through the valve (49). After heating, the domestic hot water is distributed through the piping (45). In normal cycle, the domestic hot water is distributed by the piping (46) towards the points of drawing (43a, 43b, .... 43n). The three-way valve (44) is open in the direction (V1), which has the effect of closing the circuit between the device (A), the pipes (47, 46, 50) and the pump (44). the water flowing from the loop is then pasteurized in the device (A) while being in a network at a temperature between 45 and 50 [deg] C which induces significant energy savings. The antilegionellosis treatment of the storage tank (41) will be provided once a night at an hour when there is no drawing (between 3 am and 5 am for example) and when the tank has restored its thermal stock, to do this the motorized three-way valve (44) is placed in position (V2), the pump (40) then sucks the water from the bottom of the flask and treats it in pasteurization while ensuring homogenization of the temperature of the flask .Such a design makes it possible to limit the storage temperature to a temperature between 50 and 55 [deg] C thus allowing the use of renewable energies to fully ensure the heating of domestic hot water.
Figure 7 shows the invention very compact equipped with thermal insulation. An outer casing (20) makes it possible to maintain the thermal insulator (21) constituted for example by glass wool or by polyurethane foam. This insulation will reduce heat losses from the exchanger (10) and the heater (12). A complete system in electric resistance version with total heating power 20 kiloWatt will have a diameter of around 30 cm and a total height of 50 cm, more or less powerful devices can also be produced.
A particularly interesting application of the invention is its use in domestic hot water circulation systems in hospitals or hotels, among others, because of the anti-legionella treatment which it provides but above all because of the considerable importance the energy savings it provides to perform this function and the hot water distribution temperature preventing burns.
Another application is the treatment of the cooling water of atmospheric air coolers.
Another application can be the thermal treatment of blood contaminated by the AIDS virus which could lead to a portable device ensuring the cleaning of the blood of patients.
In general and without limitation, the invention applies in all energy transfer systems requiring the rise in temperature then the cooling of a liquid.
1. Installation for pasteurizing a liquid comprising a heat exchanger (10) where the liquid (E) to be treated is heated at the primary of the exchanger and then is admitted into a tank comprising a heating element whose role is to heat the liquid at a temperature making it possible to destroy the bacteria or viruses, the liquid then being cooled at the secondary of the exchanger (10) then possibly sub-cooled before being distributed in (S).

Claims (7)

  1. 2. Installation according to claim 1 characterized in that the device for reheating the tank (12) is an electrical resistance (16) or a heat exchanger from any type of energy controlled by a thermostat (17).
  2. 3. Installation according to claim 1 characterized in that the heating device (58) is a heat pump.
  3. 4. Installation according to claim 1 characterized in that the liquid is domestic hot water and is heat treated to destroy the legionella.
  4. 5. Installation according to claim 1 characterized in that the treated liquid is not a food liquid.
  5. 6. Installation according to claim 1 characterized in that the pasteurization installation (A) is coupled with an atmospheric air cooler (30).
    7. Installation according to claim 6 characterized in that only part of the flow rate of the pump (32) circulates in the pasteurization installation (A).
  6. 8. Installation according to claim 1 characterized in that the pasteurization installation (A) is installed on the loop circuit of a domestic hot water network (46, 50, 47).
  7. 9. Installation according to claim 1 characterized in that a device (44) allows the pasteurization installation (A) to treat the water in the storage tank
    (41).
FR0307918A 2003-06-30 2003-06-30 Plant pasteurizing liquids to remove microorganisms, employs heat exchange between inlet flow and return flow from heater Withdrawn FR2856675A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0307918A FR2856675A1 (en) 2003-06-30 2003-06-30 Plant pasteurizing liquids to remove microorganisms, employs heat exchange between inlet flow and return flow from heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0307918A FR2856675A1 (en) 2003-06-30 2003-06-30 Plant pasteurizing liquids to remove microorganisms, employs heat exchange between inlet flow and return flow from heater

Publications (1)

Publication Number Publication Date
FR2856675A1 true FR2856675A1 (en) 2004-12-31

Family

ID=33515537

Family Applications (1)

Application Number Title Priority Date Filing Date
FR0307918A Withdrawn FR2856675A1 (en) 2003-06-30 2003-06-30 Plant pasteurizing liquids to remove microorganisms, employs heat exchange between inlet flow and return flow from heater

Country Status (1)

Country Link
FR (1) FR2856675A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012061905A1 (en) * 2010-11-12 2012-05-18 Nicholas Christy Recirculating shower system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0598652A1 (en) * 1992-11-16 1994-05-25 Equip'technic Improved apparatus for the production of warm or cold sterile water from city water
JP2000051842A (en) * 1998-06-03 2000-02-22 Shuichi Yamamoto Method and device for disinfecting drinking water
WO2002011773A1 (en) * 2000-08-08 2002-02-14 Cabinet J.J. Boiffier Ingenierie Technique Method and device for simultaneous sanitary treatment of a fluid and its distribution network
DE20200163U1 (en) * 2002-01-07 2002-03-28 Ferroli Ind Gmbh Circuit arrangement for domestic hot water preparation in central heat supply systems
GB2368621A (en) * 2000-10-31 2002-05-08 Imi Cornelius Water treatment apparatus
FR2830005A1 (en) * 2001-09-27 2003-03-28 Dieau Drinking water fountain has bottle inverted onto receptacle with cooling coil and heating sleeve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0598652A1 (en) * 1992-11-16 1994-05-25 Equip'technic Improved apparatus for the production of warm or cold sterile water from city water
JP2000051842A (en) * 1998-06-03 2000-02-22 Shuichi Yamamoto Method and device for disinfecting drinking water
WO2002011773A1 (en) * 2000-08-08 2002-02-14 Cabinet J.J. Boiffier Ingenierie Technique Method and device for simultaneous sanitary treatment of a fluid and its distribution network
GB2368621A (en) * 2000-10-31 2002-05-08 Imi Cornelius Water treatment apparatus
FR2830005A1 (en) * 2001-09-27 2003-03-28 Dieau Drinking water fountain has bottle inverted onto receptacle with cooling coil and heating sleeve
DE20200163U1 (en) * 2002-01-07 2002-03-28 Ferroli Ind Gmbh Circuit arrangement for domestic hot water preparation in central heat supply systems

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
LIN Y E ET AL: "LEGIONELLA IN WATER DISTRIBUTION SYSTEMS REGULAR CULTURING OF DISTRIBUTION SYSTEM SAMPLES IS THE KEY TO SUCCESSFUL DISINFECTION", AMERICAN WATER WORKS ASSOCIATION. JOURNAL, AMERICAN WATER WORKS ASSOCIATION, DENVER, CO, US, vol. 90, no. 9, September 1998 (1998-09-01), pages 112 - 121, XP008019179, ISSN: 0003-150X *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 05 14 September 2000 (2000-09-14) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012061905A1 (en) * 2010-11-12 2012-05-18 Nicholas Christy Recirculating shower system

Similar Documents

Publication Publication Date Title
US20070221362A1 (en) Disinfection System
NL1024796C2 (en) Water sterilization system for producing drinking water, e.g. on boats, has system for supplying hot sterilized water directly to tap point from hot water storage vessel
JP2003056909A (en) Heat recovery apparatus and cogeneration system
KR100884905B1 (en) The water supply apparatus for circulating cold water and hot water
FR2856675A1 (en) Plant pasteurizing liquids to remove microorganisms, employs heat exchange between inlet flow and return flow from heater
CN205137900U (en) Heat -pump water heater
KR200441180Y1 (en) The water supply system for circulating cold water and hot water
FR2984999A1 (en) Method for managing a heat pump system, heat pump system, and heating plant comprising such a system
CN204446688U (en) A kind of air disinfection and decontamination system
RU2636533C1 (en) System of building heat-supply
CN104930704A (en) Heat pump water heater and control method thereof
US20040161363A1 (en) Apparatus and method for thermal sterilization of liquids
CN105737446A (en) Method and equipment for carrying out heat recovery on steam refrigeration system
WO2000021889A1 (en) Method of preventing occurrence and growth of pathogenic microorganisms, especially legionella bacteria, in water mains
RU2437279C1 (en) Complete milk pasteurisation-refrigeration plant
DE102014003244B4 (en) Method and device for producing heated drinking water with variable input mains temperatures including thermal disinfection of drinking water in drinking water heating systems
WO2018071956A1 (en) Improvements in hot, tempered and cold water delivery systems
JP3647916B2 (en) Electric water heater
JP2004028363A (en) Antifreezer in heat pump type water heater
CN104606704A (en) Air sterilization and disinfection method and system
JP3973002B2 (en) Fluid heat sterilizer
RU2027372C1 (en) Pasteurization-cooling unit for thermal treatment of liquid food products, in particular, milk
AT392057B (en) Device for sterilizing warm water taken off from a service water storage tank
JP3049292U (en) Heat sterilization water heater
RU72120U1 (en) Installation for pasterization of liquid food products

Legal Events

Date Code Title Description
ST Notification of lapse

Effective date: 20060228