JP2012502251A - Heating system with optimal recovery of wastewater heat - Google Patents

Abstract

A heat pump (12), a waste water holding bat (10) including a casing (34) that defines an internal space (36) for holding waste water, and recovering the amount of heat in the holding bat (10), and the heat amount is transferred to the heat pump. It is related with the heating system (4) using waste-water heat recovery of the type provided with the heat exchanger (26, 28, 76) used in (12). The retaining bat (10) extends into the retaining space (36) and divides the retaining bat (10) into a plurality of compartments (46) and, together with the casing (34), bypasses the baffle (44) in the compartment (46). With at least one baffle (44) defining a wastewater flow path to enter, heat exchangers (26, 28, 76) are positioned to recover heat in at least two compartments (46).
[Selection] Figure 2

Description

  The present invention relates to a heat pump, a waste water holding bat provided with a casing that defines an internal space for holding waste water, a heat amount in the holding bat, and the heat amount used in the heat pump. The present invention relates to a heating system using waste water heat recovery of a type including an exchanger.

  French Patent No. 2885406 comprises a wastewater holding bat and a heat pump that ensures vertical thermal stratification of the wastewater, the evaporator of the heat pump being incorporated in the holding bat, and the hottest wastewater from the holding bat. Describes a heating system with wastewater heat recovery, which accepts wastewater coming from the part.

  However, the volume of the holding bat is quite large.

  An object of the present invention is to provide a heating system with small wastewater heat recovery while having high energy output.

  For this purpose, the present invention is a heating system of the type described above, wherein the holding bat comprises at least one baffle that extends into the holding space and divides the holding bat into a plurality of compartments, A waste water flow path that detours the baffle and circulates in the plurality of compartments is defined together with the casing, and a heat exchanger is arranged to recover the amount of heat in at least two compartments. , Relating to the heating system.

According to a specific embodiment, the heating system according to the invention comprises one or more of the following features that are considered to be singly or in all technically possible combinations. That is,
The wastewater flow path continuously enters each compartment;
At least one baffle includes a free edge that demarcates the wastewater flow path with the casing;
The retaining bat comprises at least one first baffle and at least one second baffle arranged head-to-tail (tip and end aligned);
At least one baffle is horizontal or vertical;
The exchanger is formed of at least one baffle including an internal coolant flow conduit;
The internal conduit forms a circuit including a plurality of parallel portions in opposite flow directions;
The system comprises at least two baffles with internal conduits connected in series to form an exchanger;
The heat pump includes an evaporator and a condenser connected by a primary circuit for refrigerant flow, and a secondary circuit for coolant flow connecting an exchanger to the evaporator.

  The present invention is also a heating facility including a waste water source, a heating system by waste water heat recovery, and heating applications such as a central heating circuit and a domestic hot water circuit to which heat is supplied by the heating system, wherein the heating system is the above-mentioned It also relates to a heating facility, characterized in that a wastewater source is connected to the inlet of the holding bat.

  The invention will be better understood when reading the following description, given solely by way of example and made with reference to the accompanying drawings.

It is a figure which shows the heating installation containing the heating system by waste water heat recovery by this invention. FIG. 2 is a transverse vertical sectional view of a wastewater holding bat and a heat exchanger of the heating system of FIG. 1. FIG. 3 is a partial side view of the holding bat of FIG. 2 in a state where a heat insulating layer of the bat is not shown. FIG. 4 is a vertical sectional view taken along line IV-IV in FIG. 2. It is a figure similar to FIG. 2 of the holding | maintenance bat of the heating system by the 2nd Embodiment of this invention. FIG. 6 shows a heat exchanger formed by a plurality of baffles in the holding bat of FIG. 5. FIG. 7 is a cross-sectional view of one of the baffles of FIG. FIG. 6 is a view similar to FIGS. 2 and 5 of a holding bat of a heating system according to a third embodiment of the present invention provided with a decanting tank. FIG. 9 is a view of the exchanger formed by the horizontal baffle in the holding bat of FIG.

  FIG. 1 shows one heating facility 2 including a heating system 4 by wastewater heat recovery and a heating application 6 to which heat is supplied by the heating system 4.

  The heating application 6 is, for example, a radiator circuit for domestic hot water, a heating floor, or a hot air system.

  The heating facility 2 also includes one or more low temperature waste water sources 8 that receive waste water from, for example, showers, washing machines, dishwashers or tubs.

  The heating system 4 includes a holding bat 10 for holding the wastewater supplied by the wastewater source 8 and a heat pump 12 that uses the heat provided by the wastewater from the bat 10.

  The heating facility 2 also includes a central control unit 7 that controls the heat pump 12 and an end use 6.

  The heat pump 12 typically includes an evaporator 14, a compressor 16, a condenser 18, and a pressure regulator 20 connected in series by a primary refrigerant circuit 22.

  The holding bat 10 includes an internal exchanger 26 and an external exchanger 28 connected in parallel to the evaporator 14 by a secondary flow circuit 30 for coolant flow.

  The secondary circuit 30 is a three-way control that selectively ensures closure of the pump 30A, the bypass conduit 30B of the exchangers 26 and 28, and the bypass conduit 30B or the exchangers 26 and 28 to ensure coolant flow. Valve 30C.

  The secondary circuit 30 also includes a control adjustment unit 30D that controls the three-way control valve 30C and the pump 30A, and a temperature sensor 30E for the coolant that flows in the secondary circuit 30. The control adjustment unit 30D receives the temperature measurement signal provided by the temperature sensor 30E and is connected to the central unit 7.

  The secondary circuit 30 is also connected to the auxiliary tank 30F.

  Next, the wastewater holding bat 10 will be described in more detail with reference to FIGS.

  The bat 10 is emptied by overflowing. That is, water enters the bat 10 and comes out of the bat 10 by overflowing from the outlet when the water level in the bat reaches the outlet level.

  The bat 10 includes a casing 34 that defines an internal space 36 for holding waste water, a waste water inlet 38 into the holding space 36, and a waste water outlet 40 from the holding space 36.

  The casing 34 includes a cylindrical wall 41 having a horizontal axis, and two vertical walls 42 that close the cylindrical wall 41 at respective ends of the cylindrical wall 41. The holding space 36 is defined by the inner surfaces of the walls 41 and 42.

  The holding space 36 has a length of 1 m to 4 m, preferably 1.4 m to 2.5 m, and a diameter of 0.4 m to 2 m, preferably 0.4 m to 1 m. These dimensions are selected according to the end use 6.

  The waste water inlet 38 and the waste water outlet 40 are each formed in the opposing vertical wall 42 by an opening that penetrates the wall 42 and appears in the holding space 36.

  The inlet 38 and the outlet 40 are arranged at the same height at the top of the holding bat 10.

  The height of the outlet 40 in the holding space 36 defines the highest waste water level in the holding space 36, and when the maximum drainage level is exceeded, the waste water overflows from the holding space 36 through the outlet 40.

  The bat 10 includes a plurality of bypass baffles 44 that extend into the holding space 36. The baffle 44 is arranged to change the direct path of water between the inlet 38 and the outlet 40 by providing a tortuous path that bypasses the baffle 44.

  The bat 10 includes a plurality of baffles 44 that are regularly distributed along the axis of the bat 10.

  The baffle 44 divides the holding space of the bat 10 into a plurality of compartments 46.

  In practice, each baffle 44 forms two compartments 46 on either side. In the illustrated example, the bat has three baffles 44 that define four compartments 46.

  Each baffle 44 is generally plate-shaped, and more precisely has a disk shape with a tip cut off. Each baffle 44 delimits a continuous surface.

  Each baffle 44 includes a joining edge 48 with the casing 34 that has a complementary shape to the casing 34, and a free edge 50 that defines a flow path 52 with the casing 34. The edge 50 is horizontal.

  The flow path 52 is located at a lower level than the waste water outlet 40.

  The baffles 44 are parallel to each other and are head-to-tail arranged in an alternating manner. The baffle 44 is vertical. The flow paths 52 are alternately formed at the bottom and top of the holding space 36.

  In the illustrated embodiment, one of the baffles 44 extends upward from the bottom of the casing 34, while the other two baffles 44 are disposed on opposite sides and extend downward from the top of the casing 34.

  The baffle 44 divides the waste water flow path from the inlet 38 toward the outlet 40 and the outlet 40 together with the casing 34. The flow path passes through each compartment 46 continuously. The flow path includes several diversions of the wastewater stream to bypass the baffle 44.

  These turnings are between 90 ° and 180 ° in the illustrated embodiment.

  The volume of the bat 10 is greater than 20 times the volume of the cross-sectional area per unit length of the inlet and outlet conduits, preferably 40 times or more.

  In the illustrated embodiment, this ratio is 45.

  Accordingly, the travel time of the waste water along the flow path is equivalent to the flow time of the waste water in the conduit having the same passage cross-sectional area as the inlet 38 and the outlet 40, so the length of the conduit is 45 times larger.

  The heat exchangers 26 and 28 are arranged to recover the amount of heat in the holding bat 10. The exchangers 26 and 28 are connected in parallel to the secondary circuit 30 and each have a manually controlled valve 58 for regulating the flow.

  The internal exchanger 26 includes a plurality of conduits 60 that extend into the holding space 36.

  Each conduit 60 passes through a respective compartment 46 continuously. Thus, the internal exchanger 26 can recover the amount of heat in each of the compartments defined by the baffle 44.

  The conduits 60 are connected in parallel. The conduits 60 are also arranged parallel to each other.

  Each conduit 60 includes two vertical portions 62 and a horizontal portion 64 connecting the two vertical portions 62 at the lower ends of the two vertical portions 62. Accordingly, each conduit 60 is U-shaped.

  The horizontal portion 64 extends substantially the entire length of the bat 10 at the bottom of the bat 10. The horizontal portion 64 extends into the flow path 52 defined by the upper baffle 44 and passes through the lower baffle 44.

  The external exchanger 28 includes a helical conduit 66 that extends helically around the casing 34 over substantially the entire length of the casing 34.

  The external exchanger 28 is disposed in a heat insulating layer 68 that surrounds the outer casing 34. The heat insulating layer 68 prevents heat loss from the bat 10.

  The holding bat 10 also includes two inspection panels 72 that are respectively disposed on the vertical walls 42 of the outer casing 34.

  The diameter of the inspection panel 72 is sufficient in the vicinity of half of the diameter of the bat 10 so that it can be easily cleaned.

  Finally, the holding bat 10 is provided with a temperature sensor 73 and a water level sensor 74 connected to the central control unit.

  Next, the operation of the present invention will be described.

  The heating facility 2 is started using the central control unit 7.

  The central control unit 7 sends an activation signal to the end use 6, the heat pump 12, and the control adjustment unit 30D of the secondary circuit 30.

  The control adjustment unit 30D controls the pump 30A and the three-way control valve 30C as a function of the control signal supplied by the central unit 7 and / or the temperature value provided by the temperature sensor 30E.

  Alternatively, the control adjustment unit 30D also controls a control valve 58 for adjusting the flow of the exchangers 26 and 28.

  The coolant is heated by the coolant flow in the exchangers 26 and 28. The coolant passes through the evaporator 14 while transferring heat to the refrigerant. The refrigerant is cooled in the condenser 18 while supplying heat to the end use 6.

  For safety and energy savings, the central control unit 7 is used when the temperature value supplied by the temperature sensor 73 of the bat 10 is too low and / or when the water level sensor 74 detects an excessively low water level in the bat 10. , Stop the equipment.

  In the present invention, the baffle 44 provides a continuous flow path for the wastewater in the plurality of compartments 46, and the exchangers 26 and 28 recover heat from the wastewater. Wastewater arriving through the inlet is forced to enter each compartment 46, which ensures large heat recovery from the wastewater by exchangers 26 and 28. The energy output of the facility 2 is high. The volume required for the holding bat 10 is small.

  When the wastewater flows for a long time around the baffle 44, optimum recovery of wastewater heat by the exchangers 26 and 28 is ensured.

  The baffle 44 prevents vertical thermal stratification of the wastewater where hottest water should be seen at the top of the bat 10, which would cause an excessively fast flow of hottest water.

  Further, the baffle 44 does not pose a risk of blocking the bat 10.

  By arranging the exchangers 26 and 28, a significant surface area of the heat exchanger is ensured with waste water present in the holding vat 10.

  The risk that the bat 10 is blocked by overflowing the bat 10 is limited. In fact, the presence of the control valve 10 at the outlet 40 is meaningless. The bat is reliable.

  Furthermore, the risk of the outlet 40 being blocked by a collection of particles is also very low.

  The use of the secondary coolant circuit 30 connecting the exchangers 26 and 28 to the evaporator 14 allows the holding bat 10 to be adapted to the existing heat pump 12.

  Furthermore, the heat pump 12 can be removed without interference with the holding bat 10, thereby facilitating assembly work and maintenance work of the equipment 2.

  Alternatively, the heating facility 2 is a building heating facility.

  5 to 7 show a heating system 4 according to a second embodiment of the present invention, and only the differences of the second embodiment from the first embodiment will be described below. In FIGS. 5-7, elements similar to those of the first embodiment are indicated using the same reference numerals.

  The heating system 4 according to the second embodiment is essentially different depending on the holding bat 10. Inner exchanger 26 and outer exchanger 28 have been replaced by a single exchanger 76 formed by baffle 44 of bat 10.

  In fact, as shown in FIGS. 6 and 7, each baffle 44 delimits an internal conduit 78 for coolant flow.

  The internal conduit 78 itself includes a baffle that allows the coolant in the internal conduit 78 to provide a long path and a long flow time, which favors the heat exchanger.

  The inlet of each conduit 78 of each baffle 44 is connected to the outlet of the adjacent baffle 44. Thus, the plurality of baffles 44 are connected in series to form the exchanger 76.

  The baffles 44 are fixed in an opening 79 formed in the cylindrical wall 41 of the casing 34 and are connected to each other outside the casing 34.

  Furthermore, the number of baffles 44 is increased. It is assumed that the number of the baffles 44 will be substantially constant in the bat 10 in the passage cross-sectional area of the waste water channel between the baffles 44 in the future.

  The exchange surface of the exchanger 76 is extremely large.

  8 and 9 show a heating system 4 according to a third embodiment of the present invention, and only the differences of the third embodiment from the second embodiment of the present invention will be described below. The same reference elements indicate similar elements.

  Third, the heating system 4 according to the embodiment includes a horizontal baffle that provides a tortuous path to the bottom of the bat 10 toward the outlet 40 at the top of the bat 10, and the bat 10 decants waste water. Is essentially different from the heating system 4 according to the second embodiment in that a tank 84 is provided.

  The horizontal baffle 44 has a complementary contour with the casing 34. Accordingly, the horizontal baffle 44 has a general rectangular shape, which facilitates the production of the horizontal baffle 44.

  Some horizontal baffles 44 have an internal conduit 78 and form an exchanger 76.

  In the illustrated embodiment, only every other horizontal baffle 44 forms the exchanger 76, and the other horizontal baffles 44 do not have a coolant flow conduit and form the exchanger 76. Arranged alternately with baffles 44. This not only reduces the bulk of the bat 10, but also reduces the cost of the exchanger 76. Nevertheless, alternatively, each horizontal baffle 44 forms an exchanger 76.

  Further, as shown in FIG. 9, the baffle 44 includes a through orifice 80 that forms a waste water channel 52.

  Decanting tank 82 is disposed at the bottom of bat 10. The decanting tank 82 is disposed on the waste water inlet 38 side.

  The decanting tank 82 is gathered downward at a single point, and more precisely is a downward conical shape. The reservoir 82 has an exit gate 84 at the lower end of the reservoir 82.

  The bat 14 lowers the waste water that has entered the bat 10 toward the bottom of the tank 82 and returns to the outlet 40 while following the path defined by the horizontal baffle 44. Is provided.

  The operation of the decanting tank 82 is simple. To clean the bat 10, it is only necessary to open the exit gate 84. The particles accumulated in the tank 82 are discharged at that time.

  Decanting tank 82 facilitates maintenance work.

  The arrangement of tank 82 and baffles 86 and 44 improves the guidance of particles present in the wastewater towards tank 82. These arrangements also restrict the particles from rising back.

Claims (11)

A heat pump (12);
A wastewater retaining bat (10) comprising a casing (34) defining an interior space (36) for retaining waste heat;
Heating system (4) based on wastewater heat recovery, which includes a heat exchanger (26, 28, 76) that recovers heat in the holding bat (10) and uses the heat in the heat pump (12). In
The holding bat (10) is at least one baffle (44) extending into the holding space (36) and dividing the holding bat (10) into a plurality of compartments (46), the casing (34) And at least one baffle (44) defining a waste water flow path that bypasses the baffle (44) and enters the compartment (46),
The heating system (26), wherein the heat exchanger (26, 28, 76) is arranged to recover heat in at least two of the plurality of compartments (46) (46). 4).   The heating system (4) according to claim 1, wherein a passage cross-sectional area of the waste water flow path between the baffles is substantially constant.   The heating system (4) according to any one of the preceding claims, wherein the waste water flow path continuously enters each of the compartments (46).   The heating system (4) according to claim 1 or 2, wherein the at least one baffle (44) includes a free edge (50) that delimits a waste water flow path (52) with the casing (34).   The holding bat (10) comprises at least one first baffle (44) and at least one second baffle (44) arranged head-to-tail. The heating system (4) according to item.   The heating system (4) according to any one of the preceding claims, wherein the at least one baffle (44) is horizontal or vertical.   The heating system (4) according to any of the preceding claims, wherein the exchanger (76) is formed with the at least one baffle (44) comprising an internal coolant flow conduit (78).   The heating system (4) of claim 7, wherein the internal conduit (78) forms a circuit including a plurality of parallel portions in opposite flow directions.   The heating system (4) according to claim 7 or 8, comprising at least two baffles (44) provided with internal conduits (78) connected in series to form the exchanger (76).   The heat pump (12) includes an evaporator (14) and a condenser (18) connected via a primary circuit (22) for refrigerant flow, and the exchanger (26, 28) to the evaporator (14). , 76) and a secondary circuit (30) for coolant flow connecting the heating system (4) according to any one of the preceding claims. Wastewater source (8),
A heating system (4) with wastewater heat recovery;
In a heating facility (2) including a central heating circuit to which the amount of heat is supplied by the heating system (4), a domestic hot water circuit and other heating applications (6),
The heating system (4) is according to any one of claims 1 to 10, characterized in that the waste water source (8) is connected to an inlet (38) of the holding bat (10). Heating equipment (2).

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