CN113701355B - Gas water heating system and control method thereof - Google Patents
Gas water heating system and control method thereof Download PDFInfo
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- CN113701355B CN113701355B CN202110975101.0A CN202110975101A CN113701355B CN 113701355 B CN113701355 B CN 113701355B CN 202110975101 A CN202110975101 A CN 202110975101A CN 113701355 B CN113701355 B CN 113701355B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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Abstract
The invention relates to a gas hot water system and a control method thereof. If the water inlet temperature is lower than the first preset temperature, the reclaimed water in the circulating water path is preheated. And when the temperature of the inlet water reaches a second preset temperature, stopping preheating. Because the water inlet pipe and the cold water pipe and/or the water return pipe are heated more and more simultaneously, when a user bathes, water entering the water heater before ignition and in the ignition process is preheated, and the temperature drop amplitude of bathing water is reduced. And if the water inlet temperature is higher than the first preset temperature, controlling the ignition of the water heater to preheat. And when the preheating time of the water heater reaches the energy-saving preheating time Te, stopping preheating. Because the energy-saving preheating time Te is equal to the total preheating time T0 multiplied by the correction coefficient, and the correction coefficient is less than 100 percent, the preheating time is effectively reduced, the preheating part of the cold water pipe or the water return pipe is reduced, the energy is saved, and the aim of effectively saving energy and preheating is fulfilled.
Description
Technical Field
The invention relates to the technical field of water heating equipment, in particular to a gas water heating system and a control method thereof.
Background
Along with pursuit of users on bathing comfort, gas water heaters with preheating function appear on the market, namely, before bathing, a circulating water path is heated in advance so as to meet the bathing requirement of users on-off heating.
The traditional gas water heater can correct the acquired preheating time in order to prevent the waste of hot water caused by the fact that redundant preheated hot water enters a circulating pipeline, so that the energy-saving preheating effect is realized. However, this control method neglects the comfort of energy-saving preheating, resulting in that a part of cold water is mixed with the preheated hot water in the hot water pipe during the bathing process, such as: the ignition of the gas water heater generally needs 2-3 seconds, if the temperature of tap water of a water inlet pipe of the water heater is very low, frozen water for 2-3 seconds enters a hot water pipe before ignition, so that the bathing water temperature of a user can be greatly reduced, and the use comfort of the user is seriously influenced.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a control method of a gas water heating system, which can realize the purposes of reducing preheating time and saving energy; but also can reduce the temperature drop amplitude of bath water and improve the bath comfort.
The second technical problem to be solved by the invention is to provide a gas water heating system, which can realize the reduction of preheating time and energy conservation; but also can reduce the temperature drop amplitude of bath water and improve the bath comfort.
The first technical problem is solved by the following technical scheme:
a control method of a gas hot water system comprises a water heater, a hot water pipe, a water inlet pipe and a cold water pipe communicated with the water inlet pipe, wherein the water inlet pipe and the hot water pipe are respectively and correspondingly communicated with a water inlet end and a water outlet end of the water heater; a connecting pipe is communicated between the hot water pipe and the cold water pipe; and/or a water return pipe is communicated between the hot water pipe and the water inlet pipe; so as to form a circulating water path, and the control method of the gas hot water system comprises the following steps: acquiring the temperature of inlet water in the water inlet pipe; if the water inlet temperature is lower than or equal to a first preset temperature, controlling the water heater to ignite, preheating the water in the circulating water path to a second preset temperature, and stopping preheating; if the water inlet temperature is higher than the first preset temperature, controlling the water heater to ignite according to the pre-stored energy-saving preheating time Te, and stopping preheating after preheating the water in the circulating water path for the energy-saving preheating time Te; the energy-saving preheating time Te is equal to the total preheating time T0 multiplied by a correction coefficient, the total preheating time T0 is the time spent when the inlet water temperature which is greater than the first preset temperature is preheated to the second preset temperature, and the correction coefficient is less than 100%.
Compared with the background art, the control method of the gas water heating system has the following beneficial effects: in the preheating process, acquiring the inlet water temperature in the water inlet pipe; and comparing the acquired inlet water temperature with a first preset temperature. And if the temperature of the inlet water is lower than the first preset temperature, controlling the ignition of the water heater to preheat the water in the circulating water path. At this time, the preheating is stopped when the water inlet temperature reaches the second preset temperature, based on the water inlet temperature. Because the water inlet pipe and the cold water pipe and/or the water return pipe are heated simultaneously, when a user bathes, water entering the water heater before ignition and in the ignition process is preheated, so that cold water entering the water heater at the initial stage of bathing is very little, and the temperature drop amplitude of bathing water is favorably reduced. And if the water inlet temperature is higher than the first preset temperature, controlling the ignition of the water heater to preheat. At the moment, taking the energy-saving preheating time Te as a standard, and stopping preheating when the preheating time of the water heater reaches the energy-saving preheating time Te. Because the energy-saving preheating time Te is equal to the total preheating time T0 multiplied by the correction coefficient, and the correction coefficient is less than 100 percent, the preheating time is effectively reduced, the preheating part of the cold water pipe or the water return pipe is reduced, the energy is saved, and the aim of effectively saving energy and preheating is fulfilled. Therefore, the control method of the gas hot water system utilizes the judgment between the water inlet temperature and the first preset temperature to carry out classified preheating on the water in the circulating water path, thereby not only reducing the preheating time and saving the energy; but also can reduce the temperature drop amplitude of bath water and improve the bath comfort.
In one embodiment, the method further comprises, before: acquiring the temperature of inlet water in the water inlet pipe; when the water inlet temperature is higher than the first preset temperature, controlling the water heater to ignite, preheating water in the circulating water path, and starting timing; when the water in the circulating water path is preheated to a second preheating temperature, acquiring the total preheating time T0 of the water heater; and calculating energy-saving preheating time Te according to a formula Te = T0 xA, and prestoring the energy-saving preheating time Te in the water heater to be used as an operation parameter in a subsequent preheating process, wherein A is a correction coefficient.
In one embodiment, the correction factor is controlled to be 50% to 80%.
In one embodiment, after the step of obtaining the temperature of the inlet water in the inlet pipe, the method further includes: judging whether the water heater meets a circulating preheating condition or not; and when the water heater meets the circulating preheating condition, executing the step of comparing the water inlet temperature with the first preset temperature.
In one embodiment, the method further comprises: and when the water heater does not meet the circulation preheating condition, controlling the water heater to be in a standby state.
In one embodiment, the loop preheating condition is any one of an all-weather mode, a reservation service mode, a jog mode, and a single loop mode.
In one embodiment, before the step of obtaining the temperature of the inlet water in the inlet pipe, the method further includes: turning on a display in the water heater and selecting a preheating function in the display.
In one embodiment, the first preset temperature is 12-18 ℃.
The second technical problem is solved by the following technical solutions:
a gas water heating system, which adopts the control method of the gas water heating system, comprises: a water heater; the water inlet pipe and the hot water pipe are respectively and correspondingly communicated with the water inlet end of the water heater and the water outlet end of the water heater, and the cold water pipe is communicated with the water inlet pipe; a connecting pipe is communicated between the hot water pipe and the cold water pipe; and/or a water return pipe is communicated between the hot water pipe and the water inlet pipe to form a circulating water path.
Compared with the background art, the gas water heating system has the following beneficial effects: by adopting the control method of the gas hot water system, the inlet water temperature in the water inlet pipe is obtained in the preheating process; and comparing the acquired inlet water temperature with a first preset temperature. And if the temperature of the inlet water is lower than the first preset temperature, controlling the ignition of the water heater to preheat the water in the circulating water path. At this time, the preheating is stopped when the water inlet temperature reaches the second preset temperature, based on the water inlet temperature. Because the water inlet pipe and the cold water pipe and/or the water return pipe are heated simultaneously, when a user bathes, water entering the water heater before ignition and in the ignition process is preheated, so that cold water entering the water heater at the initial stage of bathing is very little, and the temperature drop amplitude of bathing water is favorably reduced. And if the water inlet temperature is higher than the first preset temperature, controlling the ignition of the water heater to preheat. At the moment, taking the energy-saving preheating time Te as a standard, and stopping preheating when the preheating time of the water heater reaches the energy-saving preheating time Te. Because the energy-saving preheating time Te is equal to the total preheating time T0 multiplied by the correction coefficient, and the correction coefficient is less than 100 percent, the preheating time is effectively reduced, the preheating part of the cold water pipe or the water return pipe is reduced, the energy is saved, and the aim of effectively saving energy and preheating is fulfilled. Therefore, the control method of the gas hot water system utilizes the judgment between the water inlet temperature and the first preset temperature to carry out classified preheating on the water in the circulating water path, thereby not only reducing the preheating time and saving the energy; but also can reduce the temperature drop amplitude of the bath water and improve the bath comfort.
In one embodiment, the water heater comprises a heat exchanger, a burner and a first temperature sensor, the water inlet pipe and the hot water pipe are respectively communicated with two opposite ends of the heat exchanger, the first temperature sensor is used for detecting the temperature of inlet water between the water inlet pipe and the heat exchanger, and the burner is used for providing heat for the heat exchanger.
In one embodiment, the gas-fired water heating system further comprises a water consumption point, a hot water end of the water consumption point is communicated with the hot water pipe, a cold water end of the water consumption point is communicated with the cold water pipe, and the connecting pipe is communicated between the hot water end of the water consumption point and the cold water end of the water consumption point.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a first flowchart of a method for controlling a gas-fired water heating system according to an embodiment;
FIG. 2 is a second flowchart of a method for controlling a gas-fired water heating system according to an embodiment;
FIG. 3 is a flow chart of a control method of the gas-fired water heating system according to an embodiment;
FIG. 4 is a schematic diagram of a gas-fired water heating system according to an embodiment;
fig. 5 is a schematic structural diagram of a gas-fired water heating system in another embodiment.
Reference numerals:
100. a gas fired hot water system; 110. a water heater; 111. a heat exchanger; 112. a first temperature sensor; 113. a second temperature sensor; 114. a water pump; 115. a water inlet nozzle; 116. a water outlet nozzle; 117. a water return nozzle; 120. a water inlet pipe; 130. a hot water pipe; 140. a water return pipe; 141. a first check valve; 150. a cold water pipe; 160. a connecting pipe; 161. a second one-way valve; 170. water consumption; 171. a hot water end; 172. and (5) a cold water end.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In an embodiment, referring to fig. 1, fig. 4 and fig. 5, a control method of a gas hot water system includes that a gas hot water system 100 includes a water heater 110, a hot water pipe 130, a water inlet pipe 120 and a cold water pipe 150 communicated with the water inlet pipe 120, the water inlet pipe 120 and the hot water pipe 130 are respectively communicated with a water inlet end and a water outlet end of the water heater 110; a connecting pipe 160 is communicated between the hot water pipe 130 and the cold water pipe 150; and/or a water return pipe 140 is communicated between the hot water pipe 130 and the water inlet pipe 120; so as to form a circulating water path, and the control method of the gas hot water system comprises the following steps:
s100, acquiring the temperature of inlet water in the water inlet pipe 120;
s200, if the temperature of inlet water is less than or equal to a first preset temperature, controlling the water heater 110 to ignite, preheating water in the circulating water path to a second preset temperature, and then stopping preheating;
s300, if the temperature of the inlet water is higher than a first preset temperature, controlling the water heater 110 to ignite according to the pre-stored energy-saving preheating time Te, and stopping preheating after the water in the circulating water path is preheated for the energy-saving preheating time Te; the energy-saving preheating time Te is equal to the total preheating time T0 multiplied by a correction coefficient, the total preheating time T0 is the time spent when the inlet water temperature which is higher than the first preset temperature is preheated to the second preset temperature, and the correction coefficient is less than 100%.
In the control method of the gas water heating system, the inlet water temperature in the inlet pipe 120 is obtained in the preheating process; and comparing the acquired inlet water temperature with a first preset temperature. And if the temperature of the inlet water is lower than the first preset temperature, controlling the water heater 110 to ignite to preheat the water in the circulating water channel. At this time, the preheating is stopped when the water inlet temperature reaches the second preset temperature, based on the water inlet temperature. Since the water inlet pipe 120, the cold water pipe 150 and/or the water return pipe 140 are heated at the same time, when a user takes a bath, water entering the water heater 110 before and during ignition is preheated, so that the amount of cold water (for example, water in section AB before the water inlet end of the heat exchanger 111 in fig. 4) entering the water heater 110 at the initial stage of the bath is very small, which is beneficial to reducing the temperature drop of bath water. And if the inlet water temperature is higher than the first preset temperature (which indicates that the inlet water temperature is higher and the influence of cold water entering the water heater 110 on bath water is less), controlling the ignition of the water heater 110 to preheat. At this time, the preheating is stopped when the preheating time of the water heater 110 reaches the energy-saving preheating time Te based on the energy-saving preheating time Te. Because the energy-saving preheating time Te is equal to the total preheating time T0 multiplied by the correction coefficient, and the correction coefficient is less than 100%, the preheating time is effectively reduced, the preheating part of the cold water pipe 150 or the water return pipe 140 is reduced, the energy is saved, and the aim of effectively saving energy and preheating is fulfilled. Therefore, the control method of the gas hot water system utilizes the judgment between the water inlet temperature and the first preset temperature to carry out classified preheating on the water in the circulating water path, thereby not only reducing the preheating time and saving the energy; but also can reduce the temperature drop amplitude of bath water and improve the bath comfort.
The control method of the gas water heating system according to the present embodiment may be applied to the gas water heating system 100 having the return pipe 140, or may be applied to the gas water heating system 100 not having the return pipe 140. When the gas water heating system 100 does not have the water return pipe 140, a connection pipe 160 may be communicated between the hot water pipe 130 and the cold water pipe 150, so that a circulation waterway is formed in the gas water heating system 100. Such as: the circulating water path may be formed between the water inlet pipe 120, the heat exchanger 111, the hot water pipe 130, the water return pipe 140 and the water inlet pipe 120, or may be formed by the water inlet pipe 120, the heat exchanger 111, the hot water pipe 130, the connecting pipe 160, the cold water pipe 150 and the water inlet pipe 120, etc.; of course, the circulating water path may include both of the above-mentioned water paths.
It should be noted that the correction factor is less than 100%, that is, the energy-saving preheating time Te is less than the total preheating time T0, so that the preheating time for the cold water pipe 150 or the water return pipe 140 is reduced, which can effectively reduce the heat loss in the cold water pipe 150 or the water return pipe 140, so that the preheating part is mainly concentrated in the hot water pipe 130, and is beneficial to improving the preheating efficiency. The value of the correction factor can be determined according to the ratio between the lengths of the combined hot and cold water pipes 130. Such as: the correction factor can be, but is not limited to, 50% -80%; or 60 to 75 percent, and the like.
Specifically, the correction coefficient was 70%.
In an embodiment, referring to fig. 2, the method further includes:
s400, acquiring the temperature of inlet water in the water inlet pipe 120;
s500, when the water inlet temperature is higher than a first preset temperature, controlling the water heater 110 to ignite, preheating water in the circulating water path, and starting timing;
s600, when the water in the circulating water path is preheated to a second preheating temperature, acquiring the total preheating time T0 of the water heater 110;
and S700, calculating energy-saving preheating time Te according to a formula Te = T0 xA, and prestoring the energy-saving preheating time Te in the water heater 110 to be used as an operation parameter in a subsequent preheating process, wherein A is a correction coefficient.
Therefore, the process of acquiring the energy-saving preheating time Te is carried out based on the fact that the temperature of the inlet water is higher than the first preset temperature. When the temperature of the inlet water is higher than the first preset temperature, the water heater 110 is controlled to ignite, the circulating water path is preheated, and timing is started. Taking the preheating temperature as a standard, when the temperature of the inlet water reaches the second preheating temperature, it indicates that the water in the inlet pipe 120, the cold water pipe 150 or the return water pipe 140 is preheated, and the obtained time is the total preheating time T0. Therefore, the present embodiment corrects the total preheating time T0, reduces the preheating time for the cold water pipe 150 or the water return pipe 140, ensures that the preheating time is concentrated in the hot water pipe 130, and greatly improves the energy utilization rate.
It should be noted that the pre-stored energy-saving preheating time Te data can be stored when the water heater 110 is operated for the first time (for example, data obtained by an installer operating program when the water heater 110 is installed); or can be completed in the last preheating process of the water heater 110 before the bath; or, the water heater 110 is operated periodically according to the built-in program during the standby process, and the energy saving preheating time Te data is updated and replaced. Meanwhile, the data of the energy-saving preheating time Te is acquired based on the condition that the temperature of the inlet water is higher than the first preset temperature, so that the preheating of the cold water pipe 150 or the water return pipe 140 can be reduced as much as possible during the energy-saving preheating, and the fuel gas is further saved.
In addition, the subsequent preheating process in the present embodiment is understood as: and obtaining the energy-saving preheating time Te.
In an embodiment, referring to fig. 3, after the step of obtaining the temperature of the inlet water in the inlet pipe 120 in S100, the method further includes:
s110, judging whether the water heater 110 meets a circulating preheating condition;
and S120, when the water heater 110 meets the circulating preheating condition, executing a comparison step of the inlet water temperature and a first preset temperature. Therefore, the present embodiment adds the execution condition before the comparison between the inlet water temperature and the first preset temperature is performed. Only when the water heater 110 satisfies the circulation preheating condition, the water heater 110 performs the subsequent ordinary preheating and energy-saving preheating processes.
Further, referring to fig. 3, the method further includes: and S130, when the water heater 110 does not meet the circulating preheating condition, controlling the water heater 110 to be in a standby state, and judging to obtain common preheating and energy-saving preheating is not needed.
It should be noted that the cycle preheating condition may be any one of an all-weather mode, a reservation service mode, a jog mode, and a single cycle mode; of course, the cyclic preheat condition may be other modes of operation. The all-weather mode is a mode in which the temperature sensor monitors the temperature of water in the water heater 110 all day long, and the operation is started when the temperature is lowered and stopped when the temperature is reached, that is, the set time corresponding to the reservation service mode is 0h to 24h. The subscription service mode should be understood as that the user sets a cycle preheating time in advance, for example, 6 to 8 pm, during which the water heater 110 automatically operates to preheat. The inching mode is a mode in which a user activates a button or a valve or the like as required to drive the water heater 110 to run a preheating program, such as: in the water control mode, a user can start and stop the water mixing valve once to start the preheating program of the water heater 110. And single circulation mode is when needing to preheat, and the single circulation button on remote controller or cell-phone APP etc. is clicked to press, and water heater 110 opens the circulation and preheats, stops preheating after the temperature reaches the temperature that sets up.
In an embodiment, referring to fig. 3, before the step of obtaining the temperature of the inlet water in the inlet pipe 120 in S100, the method further includes: s800, starting a display in the water heater 110, and selecting a preheating function in the display, so that a user can conveniently select the preheating function.
In one embodiment, the first predetermined temperature is 12 ℃ to 18 ℃. In the present embodiment, the first preheating temperature is 15 ℃. In addition, the second preset temperature can be determined according to the actual requirement of the user on the hot water temperature, for example, the second preset temperature is set to be 30-70 ℃; of course, the temperature may be set to 40 ℃ to 60 ℃.
In an embodiment, referring to fig. 4 and fig. 5, a gas water heating system 100 is adopted in the control method of the gas water heating system in any one of the above embodiments, and the gas water heating system 100 includes: a water heater 110, a hot water pipe 130, a water inlet pipe 120, and a cold water pipe 150. The water inlet pipe 120 and the hot water pipe 130 are respectively and correspondingly communicated with the water inlet end of the water heater 110 and the water outlet end of the water heater 110. The cold water pipe 150 is connected to the water inlet pipe 120. A connecting pipe 160 is communicated between the hot water pipe 130 and the cold water pipe 150; and/or a water return pipe 140 is communicated between the hot water pipe 130 and the water inlet pipe 120 to form a circulating water path.
The gas hot water system 100 adopts the above control method of the gas hot water system, and obtains the water inlet temperature in the water inlet pipe 120 during the preheating process; and comparing the acquired inlet water temperature with a first preset temperature. If the temperature of the inlet water is lower than the first preset temperature, the water heater 110 is controlled to be ignited to preheat the water in the circulating water channel. At this time, the preheating is stopped when the water inlet temperature reaches the second preset temperature, based on the water inlet temperature. Because the water inlet pipe 120, the cold water pipe 150 and/or the water return pipe 140 are heated at the same time, when a user bathes, water entering the water heater 110 before and during ignition is preheated, so that little cold water enters the water heater 110 at the initial stage of bathing, and the temperature drop amplitude of bathing water is reduced. And if the inlet water temperature is higher than the first preset temperature, controlling the ignition of the water heater 110 to preheat. At this time, the preheating is stopped when the preheating time of the water heater 110 reaches the energy-saving preheating time Te based on the energy-saving preheating time Te. Because the energy-saving preheating time Te is equal to the total preheating time T0 multiplied by the correction coefficient, and the correction coefficient is less than 100%, the preheating time is effectively reduced, the preheating part of the cold water pipe 150 or the water return pipe 140 is reduced, the energy is saved, and the aim of effectively saving energy and preheating is fulfilled. Therefore, the control method of the gas hot water system utilizes the judgment between the inlet water temperature and the first preset temperature to carry out classified preheating on the water in the circulating water channel, thereby not only reducing the preheating time, but also saving the energy; but also can reduce the temperature drop amplitude of the bath water and improve the bath comfort.
Specifically, referring to fig. 4, the water heater 110 is provided with a water inlet nozzle 115 and a water outlet nozzle 116, the water inlet nozzle 115 is communicated with the water inlet end of the heat exchanger 111, and the water outlet nozzle 116 is communicated with the water outlet end of the heat exchanger 111. The water inlet pipe 120 is connected to the water inlet nozzle 115. The hot water pipe 130 is connected to the water outlet nozzle 116.
It should be noted that the circulation water path may be formed by the water inlet pipe 120, the heat exchanger 111, the hot water pipe 130, the water return pipe 140, and the water inlet pipe 120, or may be formed by the water inlet pipe 120, the heat exchanger 111, the hot water pipe 130, the connecting pipe 160, the cold water pipe 150, and the water inlet pipe 120, etc.; of course, the circulating waterway may include both of the above-mentioned waterways.
Further, referring to fig. 4, the water heater 110 includes a heat exchanger 111, a burner, and a first temperature sensor 112. The inlet pipe 120 and the hot water pipe 130 are respectively communicated with opposite ends of the heat exchanger 111. The first temperature sensor 112 is used for detecting the temperature of the inlet water between the inlet pipe 120 and the heat exchanger 111. The burner is used to provide heat to the heat exchanger 111. In this way, the temperature of the inlet water in the inlet pipe 120 can be obtained in real time through the first temperature sensor 112, so that the water heater 110 can perform normal preheating or energy-saving preheating correspondingly.
In one embodiment, referring to fig. 4, the gas fired hot water system 100 further includes a water usage point 170. The hot water end 171 of the water consumption point 170 communicates with the hot water pipe 130. The cold water end 172 of the water consumption point 170 is in communication with the cold water pipe 150. The connection pipe 160 communicates between a hot water end 171 of the water usage point 170 and a cold water end 172 of the water usage point 170. In this manner, the connection pipe 160 is connected between the hot water end 171 of the water consumption point 170 and the cold water end 172 of the water consumption point 170, so that the water flow can completely go through the hot water pipe 130 and the cold water pipe 150, so as to sufficiently preheat the hot water pipe 130 and the cold water pipe 150.
Further, referring to fig. 4, the number of the water consumption points 170 is two or more, and the two or more water consumption points 170 are connected in parallel between the hot water pipe 130 and the cold water pipe 150.
It should be noted that when the gas-fired hot water system 100 employs the non-return pipe 140, the connection pipe 160 may communicate between the hot water end 171 and the cold water end 172 of any water usage point 170. However, the connection pipe 160 is connected between the hot water end 171 and the cold water end 172 which are farthest from the water consumption point 170 of the water heater 110, so that the preheating effect is more excellent. When the gas water heating system 100 adopts the return pipe 140, one end of the return pipe 140 can be connected to the hot water end 171 of the water consumption point 170 farthest from the water heater 110, and the other end has two connection modes. Referring to fig. 4, when the water heater 110 is provided with a water return nozzle 117 communicated with the water inlet end of the heat exchanger 111, the other end of the water return pipe 140 is communicated with the water return nozzle 117. Referring to fig. 5, when the water heater 110 is not provided with the water return nozzle 117, the water return pipe 140 is directly connected to the water inlet pipe 120 (for example, at the point C of the water inlet pipe 120 in fig. 5). In addition, a first check valve 141 is provided on the return pipe 140 to make the water in the return pipe 140 flow into the water inlet pipe 120 in a one-way manner. Meanwhile, a second check valve 161 is provided on the connection pipe 160 to make the water in the hot water pipe 130 flow into the cold water pipe 150 in a single direction.
In one embodiment, referring to fig. 4, the water heater 110 further includes a second temperature sensor 113, and the second temperature sensor 113 is used for acquiring the temperature of water between the heat exchanger 111 and the hot water pipe 130.
In one embodiment, referring to fig. 4, the water heater 110 further includes a water pump 114, and the water pump 114 is disposed between the water inlet pipe 120 and the heat exchanger 111 to provide power for water flowing in the water heater 110.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A control method of a gas hot water system is characterized in that the gas hot water system (100) comprises a water heater (110), a hot water pipe (130), a water inlet pipe (120) and a cold water pipe (150) communicated with the water inlet pipe (120), wherein the water inlet pipe (120) and the hot water pipe (130) are respectively and correspondingly communicated with a water inlet end and a water outlet end of the water heater (110); a connecting pipe (160) is communicated between the hot water pipe (130) and the cold water pipe (150); and/or a water return pipe (140) is communicated between the hot water pipe (130) and the water inlet pipe (120); so as to form a circulating water path, characterized in that the control method of the gas hot water system comprises the following steps:
acquiring the water inlet temperature in a water inlet pipe (120), and classifying and preheating water in a circulating water path by utilizing the judgment between the water inlet temperature and a first preset temperature;
if the water inlet temperature is less than or equal to a first preset temperature, controlling the water heater (110) to ignite, preheating the water in the circulating water path to a second preset temperature, and then stopping preheating;
if the water inlet temperature is higher than the first preset temperature, controlling a water heater (110) to ignite according to the pre-stored energy-saving preheating time Te, and stopping preheating after preheating the water in the circulating water path for the energy-saving preheating time Te; the energy-saving preheating time Te is equal to the total preheating time T0 multiplied by a correction coefficient, the total preheating time T0 is the time spent when the inlet water temperature which is greater than the first preset temperature is preheated to the second preset temperature, and the correction coefficient is less than 100%.
2. The method of controlling a gas fired water heating system according to claim 1, said method further comprising prior to:
acquiring the temperature of inlet water in the water inlet pipe (120);
when the water inlet temperature is higher than the first preset temperature, controlling a water heater (110) to ignite, preheating water in a circulating water path, and starting timing;
when the water in the circulating water path is preheated to a second preheating temperature, acquiring the total preheating time T0 of the water heater (110);
and calculating energy-saving preheating time Te according to a formula Te = T0 xA, and pre-storing the energy-saving preheating time Te in the water heater (110) as an operation parameter in a subsequent preheating process, wherein A is a correction coefficient.
3. The control method of the gas water heating system according to claim 1, wherein the correction factor is controlled to 50% to 80%.
4. The control method of the gas-fired water heating system according to claim 1, wherein the step of obtaining the temperature of the inlet water in the inlet pipe (120) is followed by further comprising:
judging whether the water heater (110) meets a circulating preheating condition;
and when the water heater (110) meets the circulating preheating condition, executing a comparison step between the water inlet temperature and the first preset temperature.
5. The method of controlling a gas fired water heating system according to claim 4, the method further comprising:
when the water heater (110) does not meet the cyclic preheating condition, controlling the water heater (110) to be in a standby state.
6. The gas fired water heating system control method according to claim 4 wherein said cycle pre-heating condition is any one of an all-weather mode, a scheduled service mode, a jog mode, a single cycle mode.
7. The control method of the gas-fired water heating system according to claim 1, wherein the step of obtaining the temperature of the inlet water in the inlet pipe (120) is preceded by the steps of:
turning on a display in the water heater (110) and selecting a preheat function in the display.
8. The control method of the gas fired water heating system according to any one of claims 1 to 7, wherein the first preset temperature is 12 ℃ to 18 ℃.
9. A gas-fired water heating system, characterized in that, with the control method of the gas-fired water heating system according to any one of claims 1 to 8, the gas-fired water heating system (100) comprises:
a water heater (110);
the water heater comprises a hot water pipe (130), a water inlet pipe (120) and a cold water pipe (150), wherein the water inlet pipe (120) and the hot water pipe (130) are respectively and correspondingly communicated with a water inlet end of the water heater (110) and a water outlet end of the water heater (110), and the cold water pipe (150) is communicated with the water inlet pipe (120);
a connecting pipe (160) is communicated between the hot water pipe (130) and the cold water pipe (150); and/or a water return pipe (140) is communicated between the hot water pipe (130) and the water inlet pipe (120) to form a circulating water path.
10. The gas-fired water heating system according to claim 9, wherein the water heater (110) comprises a heat exchanger (111), a burner and a first temperature sensor (112), the water inlet pipe (120) and the hot water pipe (130) are respectively communicated with two opposite ends of the heat exchanger (111), the first temperature sensor (112) is used for detecting the temperature of inlet water between the water inlet pipe (120) and the heat exchanger (111), and the burner is used for providing heat for the heat exchanger (111); and/or the presence of a gas in the gas,
the gas water heating system (100) further comprises a water consumption point (170), a hot water end (171) of the water consumption point (170) is communicated with the hot water pipe (130), a cold water end (172) of the water consumption point (170) is communicated with the cold water pipe (150), and the connecting pipe (160) is communicated between the hot water end (171) of the water consumption point (170) and the cold water end (172) of the water consumption point (170).
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