JP2010196990A - Latent heat recovery type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a latent heat recovery type water heater capable of carrying out vaporization treatment of the whole amount of drain irrespective of a weather environmental condition, and capable of avoiding the occurrence of inconvenience even if a great deal of drain is generated as in unpredicted usage of hot water supply or the like. <P>SOLUTION: In a basic data storing part 734, monthly average values of regional/monthly data of air temperature and humidity and a standard drain generated amount per day are stored as standard data, and a relationship table is stored of vaporization capacities for humidity and air temperature determined beforehand by experiment. A combination of vaporization by only air blow of a blower fan 65 and vaporization of heating the air blow by a heater 66 is determined so that vaporization treatment of the whole amount of a drain generated amount can be carried out in one day on the basis of: a present drain generated amount determined from the standard drain generated amount in a drain generated amount detection processing part 731; and a vaporization capacity determined from the relationship table on the basis of detected values of an air temperature and humidity in a vaporization capacity detection processing part 732. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a latent heat recovery type hot water supply apparatus in which latent heat of combustion exhaust gas is recovered by heat exchange with combustion exhaust gas in a heat exchanger for recovering latent heat, and in particular, to vaporize drain generated at the time of latent heat recovery. The present invention relates to a latent heat recovery type hot water supply apparatus.

  The latent heat recovery type hot water supply device is also referred to as a so-called high-efficiency type hot water heater or a condensing hot water heater, and has a flue gas after heating the incoming water when heating the incoming water by sensible heat of combustion heat. It is a hot water supply device designed to increase the efficiency of heat utilization by further recovering latent heat. Here, condensing means condensation, and the condensation heat (latent heat) is recovered by condensing water vapor contained in the combustion exhaust gas.

  At the time of such latent heat recovery, combustion exhaust gas is condensed to generate strongly acidic drain (condensed water), and various measures are taken for drainage of this drain. In the case of a detached house, although it is possible to drain water indirectly to miscellaneous drainage or rainwater ditches, a drainage drain can be drained through this dedicated standing pipe, especially in apartment buildings. It has been broken.

  However, it is often difficult to install the above-mentioned exclusive stand pipes later in existing apartments aside from newly built apartment houses, and switching from conventional hot water supply equipment to highly efficient latent heat recovery type hot water supply equipment It is an obstacle. In order to deal with such problems, development of drain treatment technology that can eliminate the need for drainage facilities has been demanded, and conventionally various technologies have been proposed as drain treatment technology for that purpose.

  That is, in Patent Document 1, the drain generated in the heat exchanger for recovering latent heat is absorbed by the fabric, and the drain is blown by being diverted from the blower fan for supplying combustion air to the fabric. It has been proposed to vaporize and discharge outside the machine. Patent Document 2 proposes atomizing the drain with ultrasonic waves and discharging it to the outside by blowing air from a blower fan for combustion. In Patent Document 3, it is proposed that the drain collected after forcibly blowing off toward the outside of the machine using the wind force of the combustion fan is similarly evaporated using the wind force of the fan. Yes. In Patent Document 4, it is proposed that the drain is sprayed from the nozzle toward the outside of the apparatus using the discharge pressure of the drain pump for recovering the drain.

JP 2007-85579 A JP 2006-234271 A JP 2005-61792 A JP 2007-101074 A

  However, the technique for treating drain by vaporization (evaporation) has the following disadvantages. That is, when the temperature is low (for example, below freezing) or when the humidity is high, it is difficult to vaporize all of the generated drain within the day, and the drain that has not been vaporized is accumulated daily. As a result, it is impossible to put it to practical use. The lower the temperature is, the more frequently the hot water supply device is used and the amount of generated drain tends to increase. On the other hand, for example, when the temperature is 20 ° C. and the humidity is 30% RH, 0.2 L / h (liter) / 1 hour) vaporization ability, whereas when the temperature is 5 ° C. and the humidity is 90% RH, the vaporization ability decreases to 1/10, such as 0.02 L / h, and the generated drain is completely vaporized. It is expected that there will be no situation. Also, as a factor other than such weather environment conditions, it is conceivable that drainage exceeding the expected amount is generated due to an unexpected operation such as the use of hot water supply. In this case as well, the operation of the hot water supply device itself becomes impossible. The drain may overflow from the hot water supply device. On the other hand, although it is conceivable to evaporate the drain by heating the heater, if the energy consumption for heating the heater increases so as to exceed the energy recovery by using the latent heat recovery type hot water supply device, the significance of adopting the technology will be lost. become.

  The present invention has been made in view of such circumstances. The purpose of the present invention is to vaporize the total amount of drain generated regardless of the weather environment conditions when performing drain treatment by vaporization. It is also possible to provide a latent heat recovery type hot water supply apparatus that can avoid the occurrence of inconvenience even if an unexpected operation such as the use of hot water supply occurs.

  In order to achieve the above object, the present invention comprises the following specific items for a latent heat recovery type hot water supply device including a vaporization unit that guides and vaporizes drain generated in a latent heat recovery heat exchanger. did. That is, the vaporization filter disposed in the vaporization unit so as to absorb the drain introduced into the vaporization unit, the blowing means for vaporizing the drain by blowing air to the vaporization filter, and the drain in the vaporization unit indirectly It is assumed that a heating unit that heats the target or directly and a vaporization process control unit that controls the vaporization process by controlling the operation of the blowing unit and the heating unit are provided. And as the said vaporization process control means, the drain generation amount detection process part which detects the drain generation amount which generate | occur | produces within the unit process period for vaporization processes, the vaporization capability at the time of operating the said ventilation means, and the said heating means And a vaporization capability detection processing unit for detecting the vaporization capability when operated together, the drain generation amount detected by the drain generation amount detection processing unit, and detected by the vaporization capability detection processing unit Based on the vaporization capability, the additional operation of the heating unit is controlled in addition to the blowing by the blowing unit so that the entire drain generation amount is vaporized within the unit processing period. .

  In the case of the present invention, the air blowing means is operated or the heating means is operated in addition to the air blowing means so that the entire amount of drain generated within the unit processing period is vaporized within the unit processing period. It will be. In other words, when only the air blow by the air blowing means is insufficient, the heating means is additionally operated by the vaporization processing control means, and as a result, the drain in the vaporization section is heated and the vaporization is promoted, thereby shortening the time required for vaporization. Will be. As a result, the total amount of the generated drain is reliably vaporized every unit processing period, and installation of drainage is not required, and there is no trouble for replacement with the latent heat recovery type hot water supply device.

  In the vaporization processing control means in the present invention, standard data relating to the standard drain generation amount that is predicted to be generated in the unit processing period in accordance with the use in the standard use condition under the weather environment condition for each predetermined period consisting of the temperature and humidity. If the storage setting is made in advance, the drain generation amount detection processing unit calculates the standard drain generation amount of the corresponding period from the standard data based on the period to which the present time belongs, and the above-mentioned based on the calculated standard drain generation amount. It can be set as the structure detected by estimating the drain generation amount which generate | occur | produces in a unit processing period (Claim 2). By doing so, it becomes possible to estimate and predict the drain generation amount for each unit processing period in advance regardless of the weather environment conditions, and the combination of the operation of the air blowing means and the heating means can be reliably determined. As a result, the certainty of control is improved.

  Further, the apparatus further comprises an air temperature detecting means for detecting the air temperature and a humidity detecting means for detecting the humidity. The vaporization processing control means includes a vaporizing capability when only air is blown by the air blowing means, and heating by the heating means. If the relationship table between air temperature and humidity is stored and set in advance for the vaporization ability when the temperature is added, the vaporization capacity detection processing unit uses the air temperature detected by the air temperature detection means and the humidity detection means. Based on the detected humidity, the two types of vaporization capacities can be determined from the relationship table and detected (claim 3). By doing in this way, it becomes possible to simply and reliably acquire and detect the vaporization ability when only the air is blown from the blower means and the vaporization ability when heating by the heating means is added thereto.

  And further comprising: a non-latent heat bypass path that bypasses the latent heat recovery heat exchanger; and a non-latent heat switching means that switches the flow path to the non-latent heat bypass path so as to stop the latent heat recovery. When the control means detects that the actual drain generation amount exceeds the set upper limit amount, it can be provided with an avoidance control unit that switches the non-latent heat switching means and stops subsequent drain generation (claim). Item 4). In this case, even if an unexpectedly large amount of drain is generated, it can be detected and the subsequent drain generation can be stopped, and the use of the device due to the unexpected drain generation becomes impossible. Such inconveniences can be avoided with certainty.

  Further, the vaporization processing control means may be provided with a sterilization control section for sterilizing the vaporization section and the vaporization filter by heating the inside of the vaporization section to such an extent that the general bacteria are killed by operating the heating means. (Claim 5). In this case, it becomes possible to prevent / suppress general bacteria from propagating in the vaporizing unit or the vaporizing filter by heat sterilization by the sterilization control unit, and it is possible to maintain a sanitary state.

  And the storage tank which temporarily stores the drain collect | recovered from the heat exchanger for latent heat collection | recovery can also be made to be provided in the upstream position of the said vaporization part (Claim 6). By doing in this way, since it is temporarily stored in the storage tank before being led to the vaporization section, even if there is a variation in drain generation, it can be absorbed and the vaporization process in the vaporization section can be performed stably. It will be.

  As described above, according to the latent heat recovery type hot water supply device of any one of claims 1 to 6, the entire amount of drain generation generated within the unit processing period is vaporized within the unit processing period. Thus, it becomes possible to control the operation of the heating means alone or in addition to the air blowing means. As a result, the total amount of drainage generated can be reliably vaporized for each unit treatment period, and the installation of drainage is not required, eliminating the obstacle to replacement with a latent heat recovery type hot water supply device. Will be able to.

  According to claim 2, the amount of drain generation per unit processing period can be estimated and predicted in advance regardless of the weather environment conditions, and the combination of the operation of the blowing means and the heating means is reliably determined, The reliability of control can be improved.

  According to the third aspect, it is possible to easily and reliably acquire and detect the vaporization ability when only the air is blown from the blower means and the vaporization ability when heating by the heating means is added thereto. .

  According to claim 4, even if an unexpectedly large amount of drain is generated, it can be detected and the subsequent drain generation can be stopped, and the use of the device due to the unexpected drain generation becomes impossible. It is possible to reliably avoid the occurrence of inconvenience such as.

  According to the fifth aspect, it is possible to prevent / suppress general bacteria from propagating in the vaporization section or the vaporization filter by the heat sterilization by the sterilization control section, and it is possible to maintain a sanitary state.

  According to the sixth aspect, it is possible to temporarily store in the storage tank before being guided to the vaporization section, and even if there is a variation in the drain generation, it is absorbed and the vaporization process in the vaporization section is stably performed. Will be able to.

It is a schematic diagram which shows embodiment of this invention. 2A is a cross-sectional explanatory view of the state in which the vaporizing portion of FIG. 1 is cut in the plane direction, and FIG. 2B is a cross-sectional explanatory view taken along the line AA of FIG. It is a block diagram of a vaporization process control means. It is a numerical table | surface which shows the data of the weather environmental condition and drain generation amount according to the month of a certain area, and the calculation process for completing the vaporization process within one day about this data. It is a figure which shows the relationship table of the humidity according to temperature and vaporization capability about natural vaporization and heater vaporization. FIG. 6A is a view corresponding to FIG. 2B showing another form of the heating means, and FIG. 6B is a view corresponding to FIG. 2B showing a form of the heating means different from FIG. 6A. is there.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a latent heat recovery hot water supply apparatus according to an embodiment of the present invention. This latent heat recovery type hot water supply device is configured as a latent heat recovery type which achieves high efficiency by recovering latent heat from combustion exhaust gas in addition to sensible heat of combustion gas in the combustion heating section. In addition to the functions, it is configured as a composite heat source machine type that has both a hot water circulation heating function, a bath replenishment function, and a bath hot water function. In carrying out the present invention, it can be applied as long as it has at least a secondary heat exchanger 1 for recovering latent heat from combustion exhaust gas, and it is not essential to be a composite heat source machine. .

  In the figure, reference numeral 2 is a hot water supply circuit for realizing a hot water supply function, 3 is a heating circuit for realizing a hot water circulation heating function, 4 is a reheating circuit for realizing a bath reheating function, and 5 is a bath. A hot water pouring circuit for realizing a hot water filling function is also provided. Reference numeral 6 denotes a drain processing circuit for vaporizing drain generated in the secondary heat exchanger 1 for recovering latent heat, and 7 is an operation of each of these circuits. A controller that performs control and the like. In the hot water supply apparatus, the hot water of the heating circuit 3 is heated as a heat source, and the bath water of the hot water circuit 4 is heated by liquid-liquid heat exchange heating with the bath heater 41 to perform the hot water heating. Although it is of a type, it is not limited to this, and a reheating is performed with a combustion heating section for reheating (a combustion burner and a heat exchanger heated by the combustion heat of this combustion burner). It may be configured.

  The hot water supply circuit 2 includes a combustion hot burner 21 for hot water supply and a primary heat exchanger 22 for hot water supply for heat exchange heating of the incoming water by the combustion heat of the combustion burner 21 as a combustion heating unit. Is heated mainly in the hot water supply primary heat exchanger 22, and the heated hot water is discharged into the hot water outlet 24. At this time, the water entering from the water inlet 23 is passed through the hot water supply heat exchanging portion 1a constituting the secondary heat exchanger 1 before entering the primary heat exchanger 22. In this heat exchanging portion 1a, the water is preheated by recovering the latent heat from the combustion exhaust gas, and then enters the primary heat exchanger 22 and is mainly heated. Then, the hot water heated to a predetermined temperature and discharged to the hot water supply passage 24 is supplied to a predetermined hot water supply location such as a hot water tap 25 such as a kitchen or a bathroom or the pouring circuit 5. A water flow rate sensor 26, a water temperature sensor 27, and the like are interposed in the water passage 23, and a flow rate control valve 28, a hot water temperature sensor 29, and the like are interposed in the hot water passage 24.

  The hot water supply circuit 2 is provided with a non-latent heat bypass passage 81 that bypasses the hot water supply heat exchanging portion 1a and directly enters the water from the water intake passage 23 into the hot water supply heat exchanger 22. The non-latent heat bypass passage 81 is provided with a non-latent heat bypass valve 82, while water entering the heat exchange portion 1 a is introduced into the water inlet passage 23 on the heat exchange portion 1 a side relative to the branch position of the non-latent heat bypass passage 81. A non-latent heat on-off valve 83 that can shut off and switch off the latent heat recovery is provided. The non-latent heat bypass valve 82 and the non-latent heat opening / closing valve 83 constitute non-latent heat switching means. In the normal state, the non-latent heat bypass valve 82 is maintained in the closed state and the non-latent heat on-off valve 83 is maintained in the open state. On the other hand, the non-latent heat bypass valve 82 is opened and converted upon receiving a control signal from the controller 7. At the same time, when the non-latent heat on-off valve 83 is closed, the incoming water from the inlet passage 23 is directly supplied to the hot water supply heat exchanger 22 without being supplied to the secondary heat exchanger 1 (the hot water supply heat exchanging section 1a). The water will come in. In other words, the hot water supply heat exchanger 22 is charged and heated without performing latent heat recovery, and the latent heat recovery is temporarily stopped.

  In the illustrated example, only one hot water tap 25 is shown, but there are usually a plurality of hot water taps 25 disposed in the kitchen, washstand, bathroom, and the like. The primary heat exchanger 22 and the primary heat exchanger 32 for heating described later constitute a sensible heat recovery heat exchanger, and are configured by the hot water supply heat exchanger 1a and a heating heat exchanger 1b described later. The secondary heat exchanger 1 constitutes a latent heat recovery heat exchanger.

  The heating circuit 3 includes a heating combustion burner 31 and a heating primary heat exchanger 32 that heats and heats the circulating hot water using the combustion heat of the combustion burner 31, and the heating primary heat exchanger 32. The heating hot water circulation path 33 is passed through.

  The hot water circulation path 33 sends the low temperature water returned to the expansion tank 34 and stored to the inlet of the heating primary heat exchanger 32 by the operation of the heating circulation pump 35, where it is heated by the combustion burner 31. High-temperature water is supplied as a heat source from the high-temperature forward path 33a to the bath heater 41, which is a liquid-liquid heat exchanger, or supplied to a high-temperature heating terminal 37 such as a bathroom dryer via the high-temperature forward header 36. It has become. Further, by the operation of the circulation pump 35, the low-temperature water in the expansion tank 34 is supplied to the low-temperature heating terminal 39 such as a floor heater via the low-temperature forward header 38 and radiates heat from all the heating terminals 37 and 39. The low-temperature water having a low temperature is passed through the return header 40 and the low-temperature return path 33b to the heating heat exchanging portion 1b of the secondary heat exchanger 1 for recovering latent heat and then returned to the expansion tank 34. It is designed to circulate. In the heating heat exchanging portion 1b of the secondary heat exchanger 1, the low-temperature water is returned to the expansion tank 34 in a preheated state by latent heat recovery from the combustion exhaust gas of the heating combustion burner 31.

  Similarly to the hot water supply circuit 2, the heating circuit 3 bypasses the heating heat exchanger 1 b and passes the low temperature water from the low temperature return path 33 b to the heating heat exchanger 32 via the expansion tank 34. Thus, a non-latent heat bypass passage 84 that directly enters water is provided. The non-latent heat bypass passage 84 is also provided with a non-latent heat bypass valve 85. On the other hand, at the position near the heat exchange portion 1b of the low-temperature return passage 33b, the incoming water to the heat exchange portion 1b is cut off and switched to recover the latent heat. A non-latent heat on-off valve 86 that can be stopped is provided. The non-latent heat bypass valve 85 and the non-latent heat opening / closing valve 86 constitute non-latent heat switching means on the heating circuit 3 side. In the normal state, the non-latent heat bypass valve 85 is maintained in the closed state and the non-latent heat on-off valve 86 is maintained in the open state. On the other hand, the non-latent heat bypass valve 85 is converted to open in response to a control signal from the controller 7. When the non-latent heat on-off valve 86 is closed, the low-temperature water from the low-temperature return path 33b is supplied to the heating heat exchanger 32 without being supplied to the secondary heat exchanger 1 (heating heat exchanger 1b). Direct water entry is possible. That is, the recovery of latent heat is temporarily stopped without passing low temperature water through the heating heat exchanging portion 1b.

  In the reheating circuit 4, a bath heater 41 as a liquid-liquid heat exchange type heating unit is interposed in a recirculation circulation path 42 including a return path 42a and a forward path 42b. The bath water returned from B through the return path 42a is sent to the bath heater 41, where the bath heater 41 is reheated by liquid-liquid heat exchange using the high-temperature water on the heating circuit 3 side as a heat source. Hot water is sent to the bathtub B through the outgoing path 42b.

  The pouring circuit 5 includes a pouring passage 51 that has an upstream end branched from the hot water supply circuit 2 and a downstream end joined to the recirculation circuit 3, and a pouring solenoid valve that switches between performing and shutting off pouring by opening and closing switching. 52. The pouring solenoid valve 52 is controlled to be opened and closed by the controller 7, and by pouring, the hot water in the tapping path 24 is poured into the bathtub B through the pouring path 41 and the recirculation circuit 42 (return path 42a). A predetermined amount of hot water filling is performed.

  The drain treatment circuit 6 converts the exhaust gas generated by the combustion exhaust gas from being cooled and condensed by heat exchange for latent heat recovery in the secondary heat exchanger 1 (heat exchange unit 1a for hot water supply and heat exchange unit 1b for heating). It is a circuit installed to add vaporization treatment and to discharge vaporized (evaporated) drain vapor to the outside of the machine.

  The drain treatment circuit 6 of the embodiment includes a neutralization tank 61, a buffer tank 62, a vaporization unit 64 including a vaporization filter 63, a blower fan 65 as a blower, a heater 66 as a heating unit, and a vaporizer. And a scavenging pipe 67 for guiding the drain vapor vaporized at 64 to the collective exhaust pipe and discharging it to the outside of the apparatus. The neutralization tank 61 is filled with a neutralizing agent (for example, calcium carbonate). Drain collected and collected by the drain pan disposed at the lower position of the secondary heat exchanger 1 is introduced into the neutralization tank 61 from the inlet of the neutralization tank 61 through the outlet pipe 68. While being flowed to the outlet at the downstream end, neutralization is performed by contacting with the neutralizing agent, and the neutralized drain is supplied to the buffer tank 62 and temporarily stored. The buffer tank 62 is provided with a drain water level sensor 621 as water level detecting means for detecting the drain water level in the buffer tank 62 and outputting it to the controller 7. In addition, a detection means for detecting a weather environment condition for controlling the evaporation process of the drain by the drain processing circuit 6 is provided. That is, it includes an air temperature sensor 91 as temperature detecting means for detecting the temperature and a humidity sensor 92 as humidity detecting means for detecting the humidity.

  As shown in detail in FIG. 2, the vaporization unit 64 is disposed so that the vaporization filter 63 crosses the intermediate position in the housing 641, and the air blown from the blower fan 65 flows in from the inlet 642 on one end side and flows on the other end side. The gas is discharged through a scavenging pipe 67 communicated with the outlet 643. A heater 66 is interposed in the flow path of the air blown from the blower fan 65 so that the air can be blown to the vaporizing filter 63 after the air is heated to a predetermined temperature by turning on the heater 66. An introduction pipe 622 for introducing drain from the buffer tank 62 is connected to the bottom of the housing 641, and the drain D is introduced into the housing 641 through the introduction pipe 622 to a predetermined water level.

  The vaporizing filter 63 absorbs the drain D upward by capillary action and receives the air blown from the blower fan 65 to vaporize the drain from the surface. For example, the nonwoven fabric sheet, the mesh sheet having a predetermined gap, the fabric -Knitted fabrics are used. As a raw material itself, a nonwoven fabric sheet or a mesh sheet may be formed using rayon having excellent water absorption, cupra having excellent water absorption and durability, polypropylene having acid resistance, polyester, or stainless steel. As a specific structure, for example, a plurality of nonwoven fabric sheets 631, 631,... Are integrated in a state where they are arranged in parallel at predetermined intervals, and each nonwoven fabric 631 is aligned in a direction connecting the inlet 642 and the outlet 643. The thing arrange | positioned so that the gap | interval between adjacent nonwoven fabrics 631 and 631 may become the passage of the ventilation which goes to the exit 643 from the inlet 642 is mentioned.

  The blower fan 65 and the heater 66 are controlled by the controller 7 respectively. If the blower fan 65 is operated while the heater 66 is maintained in the non-operating state, the drain of the vaporization filter 63 is vaporized only by the blown air from the blower fan 65 (hereinafter referred to as “natural vaporization”). If the heater 66 is also operated in addition to the fan 65, the drainage of the vaporizing filter 63 can be vaporized (hereinafter referred to as "heater vaporization") by the air heated to a predetermined temperature.

  The above-described latent heat recovery type hot water supply apparatus has various types of operations such as hot water supply operation, heating operation, hot water filling operation by pouring and pouring, and reheating operation by the controller 7 having MPU, memory and the like and storing various control programs. The operation control is performed based on the output from the remote controller 71 and the outputs from the various sensors described above, and the drain vaporization processing control by the drain processing circuit 6 is performed. That is, the controller 7 includes a vaporization process control means 72 for performing drain vaporization process control as shown in a block diagram of a portion related to vaporization process control in FIG. Based on outputs from the remote controller 71, the temperature sensor 91, the humidity sensor 92, and the drain water level sensor 621, each operation control of the blower fan 65, the heater 66, and the non-latent heat bypass valves 82 and 84 is executed.

  The vaporization process control means 72 sets one day (24 hours) as a unit treatment period for the vaporization process, and performs vaporization process control so that the entire amount of drain generated in one day is vaporized within the day. A control unit 73, an avoidance control unit 74 that performs avoidance control for avoiding inconvenience due to generation of an unexpectedly large amount of drain by avoiding generation of further drain when the drain more than a specified amount is generated, A sterilization control unit 75 that performs sterilization control of the vaporization unit 64 and the vaporization filter 63 is provided.

  The vaporization control unit 73 includes a drain generation amount detection processing unit 731, a vaporization capability detection processing unit 732, a learning control unit 733, and a basic data storage unit 734. In the basic data storage unit 734, one-year weather data (temperature and humidity) for each region of the country and standard use conditions at the temperature and humidity (Japan Gas Petroleum Equipment Association JGKAS, JIS S 2071 “ Monthly average values are stored in advance for the standard drain generation amount (predicted daily generation amount) assuming the standard use conditions and standard acceleration mode and test conditions for household gas hot water / oil hot water appliances ”) When the installation area is specified by setting with the remote controller 71, for example, when the hot water supply apparatus is installed, the monthly average value of the weather data and the standard drain generation amount corresponding to the installation area is called and set as standard data to be used thereafter. It has come to be. For example, if “Osaka City” is designated as the installation area, the temperature, humidity, and standard drain generation amount (L / day: liter / day) for Osaka City as shown in the left column of FIG. The average value is set as standard data to be used thereafter. In addition, in FIG. 4, the standard drain generation amount at the time of using both hot water supply and heating is shown. In addition, in the basic data storage unit 734, the relationship between the humidity and the vaporization capability of the drain for each of the cases of natural vaporization and heater vaporization for each temperature (environment temperature where the hot water supply device is installed) is determined in advance by a test. A table or relational expression is stored. For example, in the relationship table shown in FIG. 5, the horizontal axis represents humidity, and the vertical axis represents vaporization capability. The heater vaporization (see the solid line in the figure) and natural vaporization (see the broken line in the figure). ) And vaporization capacity with respect to humidity by temperature (in the case of heater vaporization, it is -5 ° C, 5 ° C, 12 ° C, 20 ° C, and in the case of natural vaporization, each temperature is 5 ° C, 12 ° C, 20 ° C) A relational line (relational expression) is defined. In this case, the air is heated to approximately 30 ° C. or more in the heater vaporization.

  The drain generation amount detection processing unit 731 calculates the current month based on the electronic clock, and acquires the standard drain generation amount corresponding to the month from the basic data storage unit 734. On the other hand, the vaporization capability detection processing unit 732 calculates and estimates the corresponding vaporization capability from the relation table based on the actual temperature and humidity detected by the temperature sensor 91 and the humidity sensor 92. When the detected temperature is an intermediate value of the relationship line shown in FIG. 5, the corresponding vaporization ability may be calculated and calculated by means such as linear interpolation. And the vaporization control part 73 is based on the vaporization capability of both the case of the above-described natural vaporization and heater vaporization, and the standard drain generation amount of the month corresponding to the month to which the present time belongs. Time value for natural vaporization (blowing fan 65 is activated) and heater vaporization (both blower fan 65 and heater 66 are activated) so that the standard drain generation amount generated on the day can be vaporized within the day (within 24 hours). The combination with the time value to be determined is determined and set by trial calculation.

  For example, as shown in FIG. 4, the time required for vaporization is calculated when the standard drain generation amount (for one day) of each month is assumed to be vaporized only by natural vaporization (the standard drain generation amount is divided by the vaporization capability). Then, January (35.4h), February (32.2h), and December (29.9h) exceed 24h (24 hours), and March (23.2h) also takes nearly 24h of vaporization time. It will be. For this reason, the vaporization amount is calculated when the heater vaporization is added by 3.0 h in January, 2.5 h in February, 0.5 h in March, and 2.0 h in December. Multiply by time). At this time, it is set slightly on the safe side. For example, in January, “0.398 L / h” of the vaporization capability of heater vaporization is multiplied by the vaporization time “3.0 h” to obtain “1.19 L”. If the drain remaining amount obtained by subtracting this from the standard drain generation amount is vaporized by natural vaporization, the vaporization required time is recalculated, and the total time of the natural vaporization time value and the heater vaporization time value is less than 24h. If so, the combination of the natural vaporization time value and the heater vaporization time value is determined as the basic control value. For example, in January, when the drain remaining amount “1.50 L” obtained by subtracting “1.19 L” from the standard drain generation amount “2.69 L” is naturally vaporized, “19.7 h” (1.50 / 0.076 = 19.7) and heater vaporization “3.0 h” is added to “19.7 h” to obtain “22.7 h”. As a result of the above calculation, heater vaporization is used in addition to natural vaporization for the first three months and December, and vaporization processing using only natural vaporization is executed in the other months of April to November. Set to.

  When combining the above-mentioned heater vaporization and natural vaporization, the execution of the heater vaporization is set to a midnight time zone within a day or a time zone when the temperature is high, and the natural vaporization is executed in the remaining time zone. What should I do? This is because the heating cost can be reduced by setting to a midnight time zone where the power cost is low or a high temperature zone where the temperature is high and the vaporization time can be expected to be shortened.

  By performing the vaporization process with the above-described basic control values set initially, the drain generated on that day can be vaporized within that day and not left on the next day. Next, learning control is performed by the learning control unit 733 while performing vaporization processing by the initial setting with the above basic control values. In other words, while accumulating actual data, the basic control values are sequentially corrected based on the actual data, and learning control is performed so as to optimize the heater vaporization time or the total vaporization time. Execute by parallel processing. That is, the temperature detected by the temperature sensor 91 and the humidity detected by the humidity sensor 92 are accumulated as actual weather environment conditions, the accumulated actual weather environment condition values (temperature and humidity), and the standard drain generation amount. Compared to the weather environment data (monthly average value) that became the basis of the standard, the standard drain generation amount was negatively or positively corrected based on the deviation, and based on the correction amount, the vaporization time value of the heater vaporization was first fixed What is necessary is just to carry out minus correction or plus correction by the amount. In other words, the amount of operation of the heater 66 that leads to the most energy reduction is corrected with a negative correction with priority. In addition to the above-mentioned accumulation of actual weather environment condition values (temperature and humidity) as a learning control by negatively correcting or positively correcting the standard drain generation amount, or such weather environment condition values (temperature and Instead of accumulating (humidity), the drain water level detected by the drain water level sensor 621 in the buffer tank 62 within the most recent predetermined period, the amount of combustion of the combustion burners 21 and 31 within the most recent predetermined period, the combustion time thereof, etc. Based on this, it is also possible to perform a learning control in which the standard drain generation amount is negatively corrected or positively corrected, and the vaporization time value of heater vaporization is corrected based on this correction amount.

  In the above vaporization process, a day different from the standard drain generation amount may come out depending on the daily use situation of the hot water supply apparatus. Although a small amount of generation is good, a large amount of generation may cause inconvenience. For this reason, when the avoidance control unit 74 detects that the generated amount is larger than expected, the non-latent heat bypass valves 82 and 85 are opened and the non-latent heat on-off valves 83 and 86 are closed and converted. Subsequent latent heat recovery is forcibly stopped. That is, control is performed to avoid the occurrence of inconvenience by switching so as not to generate drain. The detection that the generated amount is larger than expected, that is, the set upper limit amount or more is performed by detecting that the drain water level sensor 621 of the buffer tank 62 exceeds a predetermined set upper limit water level, for example. In addition, the latent heat amount of the combustion exhaust gas that comes into contact with the secondary heat exchanger 1 is estimated from the combustion time per day of the combustion burners 21 and 31, the combustion capacity thereof, and the incoming water temperature by the incoming water temperature sensor 27. Then, by estimating the amount of drain generation from this amount of latent heat, it is possible to detect the generation of drain above the set upper limit amount.

  The sterilization control unit 75 performs heat sterilization of the vaporization filter 63, and sterilizes by heating by blowing high-temperature air to the vaporization filter 63. Specifically, the air blowing fan 65 and the heater 66 are both operated, and the air temperature is heated by the heater 66 to a sterilization temperature (for example, 60 ° C. or more) at which general bacteria are killed. Let it continue (for example, for a few minutes). The execution of the sterilization control is executed at the end point (start point) of the calculation day for the vaporization process. For example, a time (for example, 3:00 pm) before the bath preparation time at which drainage is most generated may be set as the starting point of the calculation day.

<Other embodiments>
In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the above-described embodiment, the two-can three-water type latent heat recovery type hot water supply device is shown, but not limited to this, a single can two-water type hot water supply device may of course be used. In addition, a multifunction machine having a heating circuit, a reheating circuit, and a pouring circuit is shown. However, a single-function hot water supply latent heat recovery type hot water supply device, and a combined type latent heat recovery type hot water supply device composed of a hot water supply circuit and a heating circuit For example, the present invention may be applied. Moreover, in the said embodiment, although the thing provided with the secondary heat exchanger 1 which consists of two heat-exchange parts 1a and 1b was shown, it is not restricted to this, either for hot water supply or for heating one secondary heat You may apply this invention to what was provided with the exchanger.

  In the above embodiment, the heater 66 is shown as the heating means, and the drain in the vaporizing section 64 is indirectly heated by heating the air blown by the heater 66. However, the present invention is not limited to this. As shown in FIG. 6 (a), a plate-like heater 66a that generates heat due to electrical resistance, for example, is brought into contact with the bottom surface of the housing of the vaporizing section 64, or a similar heater that has been subjected to a waterproofing treatment is drained in the vaporizing section 64. The drain may be directly heated by arranging it in a submerged state. Alternatively, the combustion exhaust gas after the latent heat recovery may be guided and the drain in the vaporization unit 64 may be heated using the residual heat of the combustion exhaust gas. For example, as shown in FIG. 6B, the outer periphery of the vaporizing portion 64 is covered with a cover member 66 b, and the combustion exhaust gas is discharged into the gap space between the inner surface of the cover member 66 b and the outer surface of the housing 641 of the vaporizing portion 64. It flows in from one end 661 and flows out from the other end 662 to return to the original collective exhaust pipe. In this case, the drain in the vaporization part 64 can be indirectly heated by the residual heat of combustion exhaust gas, such as the cover member 66b, the supply flow path of combustion exhaust gas to the one end 661, and an on-off valve for switching the supply thereof. Thus, the heating means is configured.

  In the above embodiment, the drain led out by the lead-out pipe 68 is supplied to the neutralization tank 61, the buffer tank 62, and the vaporizing section 64 in a natural flow-down manner based on the gravity action. In the case where the natural flow-down method cannot be adopted, a drain pump may be interposed in the middle of an appropriate drain channel. A water level adjusting means (for example, a valve for restricting inflow) for adjusting the water level so that the drain water level in the vaporizing unit 64 does not exceed a predetermined level may be installed in the vicinity of the introduction pipe 622 for the vaporizing unit 64. .

  Although the example which provided the neutralization tank 61 was shown in the said embodiment, you may abbreviate | omit not only this but the neutralization tank 61. FIG. In this case, the strongly acidic drain is absorbed by the vaporizing filter 63 and vaporized as it is.

  In the drain generation amount detection processing unit 731 of the above embodiment, the standard data set based on the storage data related to the standard drain generation amount stored and set in the basic data storage unit 734, or after being corrected by the learning control unit 733 Although the drain generation amount is detected based on the correction value of the standard data, the present invention is not limited to this, and the actual weather environment and combustion state can be detected without using such standard data and the correction value. Thus, the amount of drain generation may be estimated and detected. For example, the memory detected by the air temperature sensor 91, the humidity detected by the humidity sensor 92, the amount of combustion controlled and output during the most recent predetermined period, or the drain of the buffer tank 62 within the most recent predetermined period. Based on one or a combination of two or more actual state detection values such as the drain water level detected by the water level sensor 621, the amount of drain generated in the current unit processing period (one day in the embodiment) is You may make it detect by estimating. Here, the most recent predetermined period may be, for example, 24 hours (one day) of the previous day, or 24 hours of the last week (last week) on the same day of the week as the current day, Alternatively, it may be two or more days instead of one day. In the case of multiple days, if the unit processing period is one day, the average amount of drain generation per day may be used.

  In the above embodiment, the humidity sensor 92 is installed as the humidity detecting means, but this is not limiting, and this may be omitted. In this case, for example, the humidity may be estimated and detected by the amount of change in the water level per unit time of the drain water level sensor 621 that detects the water level of the drain stored in the buffer tank 62. That is, the humidity detection means is configured by the drain water level sensor 621 and the element that performs humidity estimation processing from the water level change amount.

  When the temperature sensor 91 detects a weather environment in which a temperature of 10 ° C. or lower continues for a predetermined time (for example, 7 hours) or longer, even if the vaporization process using only natural vaporization is set as the control condition, the heater 66 It is also possible to add a control for forcibly operating the heater to execute the vaporization of the heater for a predetermined time.

  Instead of performing sterilization control by the sterilization control unit 75, or in combination with the sterilization control, an antibacterial agent that elutes silver, copper ions, etc. is applied to the vaporizing filter 63, or is submerged in the drain. It is also possible to suppress or prevent the propagation of general bacteria by arranging them.

  The amount of air blown by the blower fan 65 may be adjusted by controlling the rotational speed of the fan motor, and the degree of clogging of the vaporizing filter 63 may be detected depending on the rotational speed fluctuation at a constant output. When the clogging has progressed to the set amount, for example, a warning display for replacement may be displayed on the remote controller 71.

1 Secondary heat exchanger (heat exchanger for latent heat recovery)
62 Buffer tank 63 Evaporation filter 64 Evaporation part 65 Blower fan (blower means)
66, 66a heater (heating means)
66b Cover member (heating means)
67 Scavenging pipe 72 Evaporation processing control means 73 Evaporation control part 74 Avoidance control part 75 Sterilization control part 81, 83 Non-latent heat bypass path 82, 84 Non-latent heat bypass valve (non-latent heat switching means)
91 Air temperature sensor 92 Humidity sensor 621 Drain water level sensor 731 Drain generation amount detection processing unit 732 Vaporization capacity detection processing unit 733 Learning control unit 734 Basic data storage unit D Drain

Claims (6)

A latent heat recovery type hot water supply apparatus comprising a vaporization section that guides the drain generated in the latent heat recovery heat exchanger and vaporizes it,
A vaporization filter disposed in the vaporization unit so as to absorb the drain introduced into the vaporization unit, a blower for vaporizing the drain by blowing air to the vaporization filter, and the drain in the vaporization unit indirectly or A heating unit that directly heats, and a vaporization process control unit that performs vaporization process control by controlling the operation of the blowing unit and the heating unit,
The vaporization processing control unit combines a drain generation amount detection processing unit that detects a drain generation amount generated within a unit processing period for vaporization processing, a vaporization capability when the blowing unit is operated, and the heating unit. A vaporization ability detection processing unit that detects the vaporization ability when operated
Based on the drain generation amount detected by the drain generation amount detection processing unit and the vaporization capability detected by the vaporization capability detection processing unit, the entire drain generation amount is vaporized within the unit processing period. The latent heat recovery type hot water supply apparatus is configured to control the additional operation of the heating means in addition to the air blow by the air blowing means. The latent heat recovery hot water supply device according to claim 1,
In the vaporization control means, standard data relating to a standard drain generation amount that is predicted to be generated in the unit treatment period in accordance with the use under the standard use condition under a predetermined period of weather environment consisting of temperature and humidity is previously stored. Memory setting,
The drain generation amount detection processing unit calculates the standard drain generation amount of the corresponding period from the standard data based on the period to which the present time belongs, and generates the drain generated in the unit processing period based on the calculated standard drain generation amount. A latent heat recovery hot water supply device configured to detect by estimating the amount. The latent heat recovery type hot water supply device according to claim 1 or 2,
An air temperature detecting means for detecting the air temperature; and a humidity detecting means for detecting the humidity;
In the vaporization processing control means, a relationship table of the temperature and humidity is stored and set in advance for the vaporization ability when only blowing by the blowing means and the vaporization ability when heating by the heating means is added thereto,
The vaporization capability detection processing unit is configured to determine and detect the two types of vaporization capability from the relation table based on the temperature detected by the temperature detection unit and the humidity detected by the humidity detection unit. Constructed, latent heat recovery type hot water supply device. The latent heat recovery hot water supply device according to any one of claims 1 to 3,
A non-latent heat bypass path that bypasses the latent heat recovery heat exchanger, and a non-latent heat switching means that switches the flow path to the non-latent heat bypass path to stop the latent heat recovery,
The vaporization processing control means comprises a avoidance control unit that switches the non-latent heat switching means to stop the subsequent drain generation when detecting that the actual drain generation amount exceeds the set upper limit amount. Hot water supply device. The latent heat recovery hot water supply device according to any one of claims 1 to 4,
The latent heat recovery type hot water supply apparatus, wherein the vaporization processing control unit includes a sterilization control unit that sterilizes the vaporization unit and the vaporization filter by heating the inside of the vaporization unit to such an extent that the general bacteria are killed by operating the heating unit. The latent heat recovery hot water supply device according to any one of claims 1 to 5,
A latent heat recovery type hot water supply apparatus comprising a storage tank that temporarily stores drain recovered from a latent heat recovery heat exchanger at a position upstream of the vaporization unit.

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