CN109631142B - Energy-saving and efficient gas central hot water optimization system - Google Patents
Energy-saving and efficient gas central hot water optimization system Download PDFInfo
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- CN109631142B CN109631142B CN201811480599.8A CN201811480599A CN109631142B CN 109631142 B CN109631142 B CN 109631142B CN 201811480599 A CN201811480599 A CN 201811480599A CN 109631142 B CN109631142 B CN 109631142B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D17/00—Domestic hot-water supply systems
- F24D17/0026—Domestic hot-water supply systems with conventional heating means
- F24D17/0031—Domestic hot-water supply systems with conventional heating means with accumulation of the heated water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D17/00—Domestic hot-water supply systems
- F24D17/0078—Recirculation systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/02—Fluid distribution means
- F24D2220/0207—Pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/04—Sensors
- F24D2220/042—Temperature sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/04—Sensors
- F24D2220/048—Level sensors, e.g. water level sensors
Abstract
The invention discloses an energy-saving and efficient gas central hot water optimization system which comprises a cold water main pipe, a primary heating circulating pipe, a secondary heating circulating pipe, a cold water supplementing electric valve, a hot water heat preservation water tank, a water heater circulating pump, a gas unit, a PLC (programmable logic controller), a water level sensor and a temperature sensor, wherein the cold water main pipe is connected with the primary heating circulating pipe; the gas turbine set is divided into a primary heating gas turbine set and a secondary heating gas turbine set; one end of the cold water supplementing electric valve is connected to a municipal water supply network through a cold water main pipe, and the other end of the cold water supplementing electric valve is sequentially communicated with the primary heating gas unit and the hot water heat preservation water tank through a primary heating circulating pipe; the water outlet end of the hot water heat preservation water tank is sequentially communicated with a water heater circulating pump and a secondary heating gas engine unit through a secondary heating circulating pipe to form a closed loop; the water level sensor and the temperature sensor are arranged in the hot water heat preservation water tank. The system can solve the problems that a gas turbine set cannot output full power, the water temperature fluctuation of the hot water heat preservation water tank is large, and a circulating pump of a system heating water heater consumes a large amount of energy.
Description
Technical Field
The invention relates to the field of central hot water systems, in particular to an energy-saving and efficient gas central hot water optimization system.
Background
The central hot water system is characterized in that hot water is obtained when a faucet is opened, and the shower head emits hot water. Providing convenience for life. At present, the bath foam is generally only used in hotels, bathing places, clubs and the like. With the improvement of living standard, families and some small and medium hotels are gradually adopted at present. The hot water at any time enables people to have a comfortable life, and the washing of hands and vegetables is realized by the hot water, namely the bathing. The central hot water system mainly comprises a heat source, a heat exchange system, a heat storage system and a circulating system. Referring to fig. 1, for example, a common central hot water system (referred to as a former system for short) includes a cold water pipe, a heating circulation pipe, a cold water supply electric valve, a hot water holding water tank, a water heater circulation pump, a gas turbine, a PLC controller, a heating circulation pipe, a hot water pressurizing pump, a water return pipe, and a water return electromagnetic valve. Such central hot water systems have the following drawbacks:
(1) the gas turbine set can not output full power: the gas turbine set has the characteristics that when the temperature difference between inlet water and outlet water is large, such as the delta temperature difference is more than or equal to 25 ℃, the gas turbine set can output 100 percent of full power; when the temperature difference between inlet water and outlet water is small, such as the delta temperature difference is only more than or equal to 5 ℃, the gas turbine unit only outputs about 20 percent of power: namely, the larger the temperature difference between the inlet water and the outlet water is, the larger the output power of the gas turbine set is, and the higher the thermal efficiency is; on the contrary, the smaller the temperature difference between the inlet water and the outlet water is, the lower the output power of the gas turbine unit is, and the lower the thermal efficiency is. In general, the temperature of the hot water heat preservation water tank is set to be constant, namely the temperature of the hot water is 50-55 ℃, and the temperature of the outlet water of the gas turbine unit is about 55 ℃, so that the power of the gas turbine unit is obviously idle, and waste and redundancy are caused.
(2) The water temperature fluctuation of the hot water heat preservation water tank is large: when the water terminal uses a large amount of hot water, the water level of hot water holding water box can reduce rapidly, when the water level is less than the settlement water level, the PLC controller can open automatically and mend the cold water motorised valve and supply a large amount of cold water to hot water holding water box. When the weather condition is poor, the water temperature of the hot water heat-preservation water tank can be rapidly reduced, although the output power of the gas turbine unit is slightly improved due to the fact that the temperature difference of inlet and outlet water is increased, the instant temperature reduction can not be completely met due to the fact that the weather condition is poor, such as low environment temperature, low cold water temperature, large system heat loss and the like, the water temperature in the hot water heat-preservation water tank can be rapidly reduced to 50 ℃ or even lower, and therefore the stability of the temperature of system heating water and the use experience of water end users are greatly influenced.
(2) The circulating pump of the system heating water heater consumes a large amount of energy: municipal tap water automatically flows into the hot water heat preservation water tank, when the gas engine group heats the hot water heat preservation water tank, a water heater circulating pump needs to be started, namely the central hot water system needs to start the water heater circulating pump as long as heating is carried out, so that electric energy can be consumed, and the water heater circulating pump has fault hidden trouble and needs to be maintained frequently when running for a long time.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an energy-saving and efficient gas central hot water optimization system which has the advantages that a gas turbine set can output full power, the fluctuation of water temperature is small, and the energy consumption of a circulating pump of a water heater is saved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an energy-saving and efficient gas central hot water optimization system comprises a cold water main pipe, a primary heating circulating pipe, a secondary heating circulating pipe, a cold water supplementing electric valve, a hot water heat preservation water tank, a water heater circulating pump, a gas unit, a PLC (programmable logic controller), a water level sensor and a temperature sensor; the gas unit is divided into a primary heating gas unit and a secondary heating gas unit; one end of the cold water supplementing electric valve is connected to a municipal water supply network through the cold water main pipe, and the other end of the cold water supplementing electric valve is sequentially communicated with the primary heating gas unit and the hot water heat preservation water tank through the primary heating circulating pipe; the water outlet end of the hot water heat-preservation water tank is sequentially communicated with the water heater circulating pump and the secondary heating gas engine unit through the secondary heating circulating pipe to form a closed loop; the water level sensor and the temperature sensor are arranged in the hot water heat-preservation water tank and are electrically connected with the PLC; and the PLC is electrically connected with the cold water supplementing electric valve and the water heater circulating pump.
As a further improvement of the invention: the cold water heat preservation water tank is characterized by also comprising a cold water branch pipe, a water shortage prevention cold water supplementing electric valve and a water shortage level sensor, wherein the cold water branch pipe is communicated between the cold water main pipe and the water inlet end of the hot water heat preservation water tank; the water shortage prevention cold water supplementing electric valve is installed on the cold water branch pipe, the water shortage water level sensor is installed in the hot water heat preservation water tank and is electrically connected with the PLC, and the PLC is electrically connected with the water shortage prevention cold water supplementing electric valve.
As a further improvement of the invention: the hot water pressure pump is communicated with the hot water heat-preservation water tank at one end, the hot water supply pipe network is communicated with the water using terminal at the other end, the pressure gauge is installed on the hot water pipe, and the pressure gauge and the hot water pressure pump are respectively electrically connected with the variable frequency controller.
As a further improvement of the invention: the hot water supply system is characterized by further comprising a water return pipe, a water return electromagnetic valve and a water return temperature sensor, wherein one end of the water return pipe is communicated with the hot water heat-preservation water tank, the other end of the water return pipe is communicated with the hot water supply pipe network, the water return electromagnetic valve and the water return temperature sensor are installed on the water return pipe, and the water return electromagnetic valve and the water return temperature sensor are respectively electrically connected with the PLC.
As a further improvement of the invention: the cold water bypass pipe is connected between the cold water main pipe and the cold water branch pipe in parallel, and the bypass valve is installed on the cold water bypass pipe and electrically connected with the PLC.
As a further improvement of the invention: still include cold water temperature sensor and cold water meter, cold water temperature sensor and cold water meter are installed on the cold water is responsible for and with the PLC controller electricity is connected.
A control method of an energy-saving and efficient gas central hot water optimization system comprises the following steps: (401) the water level sensor detects the water level of the hot water heat preservation water tank and transmits a detected water level signal of the hot water heat preservation water tank to the PLC; (402) after receiving the water level signal, the PLC judges whether the water level signal is lower than a set limit water level or not, (403) if so, the water shortage and cold water supplementing prevention electric valve and the cold water supplementing electric valve are opened, and (404) the water shortage and cold water supplementing prevention electric valve and the cold water supplementing electric valve are stopped until the water level of the hot water heat preservation water tank reaches the set limit water level.
A control method of an energy-saving and efficient gas central hot water optimization system comprises the following steps: (301) the water shortage level sensor detects the water level of the hot water heat preservation water tank and transmits a detected water level signal of the hot water heat preservation water tank to the PLC; (302) after receiving the water level signal, the PLC judges whether the water level signal is lower than a set warning water level or not, (303) if so, the electric valve for preventing water shortage and supplementing cold water is opened, normal-temperature water of the municipal water supply network flows into the hot water heat preservation water tank through the cold water branch pipe, and (304) the electric valve for supplementing cold water is stopped until the water level of the hot water heat preservation water tank reaches the set warning water level.
A control method of an energy-saving and efficient gas central hot water optimization system comprises the following steps: (101) the water level sensor detects the water level of the hot water heat preservation water tank and transmits a detected water level signal of the hot water heat preservation water tank to the PLC; (102) the PLC controller judges whether the water level signal is lower than a set water level or not after receiving the water level signal, (103) if so, the water supplementing electric valve is opened, normal-temperature water of the municipal water supply network flows through the primary heating gas unit through the cold water main pipe and the primary heating circulating pipe, flows into the hot water heat-preserving water tank after being heated and warmed by the primary heating gas unit, and (104) the water supplementing electric valve and the primary heating gas unit are stopped until the water level of the hot water heat-preserving water tank reaches the set water level.
As a further improvement of the invention: further comprising the steps of: (201) the temperature sensor detects the water temperature of the hot water heat-preservation water tank and transmits a detected water temperature signal of the hot water heat-preservation water tank to the PLC; (202) after receiving the water temperature signal, the PLC judges whether the water temperature signal is lower than a set heating temperature or not, (203) if so, judges whether the received water level signal is lower than the set water level or not, (204) if not, starts a water heater circulating pump and a secondary heating gas unit, water in the hot water heat-preservation water tank flows through the secondary heating gas unit, rises above a set temperature rise temperature and then is supplemented into the hot water heat-preservation water tank, and (205) stops the water heater circulating pump and the secondary heating gas unit until the water temperature of the hot water heat-preservation water tank reaches the set temperature.
Compared with the prior art, the invention has the beneficial effects that:
(1) when the water level sensor detects that the water level of the hot water heat-preservation water tank is lower than the set water level, namely x is more than or equal to 25% and less than 60% of the water level of the hot water heat-preservation water tank, the water supplementing electric valve can be opened, supplemented tap water flows through the primary heating gas unit, and is directly supplemented into the hot water heat-preservation water tank after being heated and warmed by the primary heating gas unit. On one hand, as the water temperature of tap water is about 15-25 ℃, even if the outlet water temperature of the primary heating gas unit is only 55 ℃, the delta temperature difference is at least 25 ℃ or more, the primary heating gas unit can completely output 100% of full power, thereby achieving the purpose of making the best use of things and solving the problems of waste and redundancy caused by obvious idle power of the gas unit due to small temperature difference of inlet and outlet water of the gas unit; on the other hand, the supplemented tap water can flow into the hot water heat preservation water tank after being heated by the primary heating gas engine unit, the outlet water temperature of the primary heating gas engine unit is 55 ℃, the outlet water temperature is close to the water temperature in the hot water heat preservation water tank, the fluctuation of the water temperature is very small or even negligible, and the problems that the temperature difference between the tap water and the hot water heat preservation water tank is large and the fluctuation of the water temperature is large due to poor weather conditions such as low environmental temperature, low cold water temperature, large heat loss of a system and the like, the instant temperature drop of the hot water heat preservation water tank can be caused by directly injected low-temperature tap water, the instant temperature drop of the hot water heat preservation water tank can not be completely met by the heating capacity of the gas engine unit, and the water temperature in the.
(2) When the water level sensor detects that the water level of the hot water heat-preservation water tank is lower than a set water level, namely, x is more than or equal to 25% and less than 60% of the water level of the hot water heat-preservation water tank, the cold water supplementing electric valve can be opened, the pressure of a municipal water supply network is fully utilized to flow through the primary heating gas engine set for heating, a water heater circulating pump is not required to be started, the water heater circulating pump is started only when the water level of the hot water heat-preservation water tank reaches the set warning water level, namely, x is more than or equal to 60% of the water level of the hot water heat-preservation water tank, and the temperature. The scheme can greatly reduce the power of the circulating pump of the water heater, not only can consume the electric energy for starting the circulating pump of the water heater, but also avoids the faults and maintenance items possibly caused by the long-term operation of the circulating pump of the water heater, and also reduces the vibration and noise when the circulating pump of the water heater operates.
Drawings
FIG. 1 is a schematic structural diagram of the original system.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a schematic structural diagram of the present invention.
Fig. 4 is a schematic structural diagram of the control method S4.
In the figure, a cold water main pipe 31, a primary heating circulating pipe 32, a secondary heating circulating pipe 33, a cold water branch pipe 34, a hot water pipe 35, a water return pipe 36, a cold water bypass pipe 37, a cold water supplementing electric valve 1, a hot water heat preservation water tank 6, a water heater circulating pump 3, a gas unit 4, a PLC (programmable logic controller) 10, a water level sensor 2, a temperature sensor 5, a water shortage preventing and cold water supplementing electric valve 19, a water shortage water level sensor 18, a hot water pressurizing pump 7, a pressure gauge 20, a frequency conversion controller 9, a water return electromagnetic valve 14, a water return temperature sensor 12, a bypass valve 21, a cold water temperature sensor 13, a cold water meter 22, a.
Detailed Description
The invention will now be further described with reference to the accompanying description and examples:
referring to fig. 2 and 3, an energy-saving and efficient gas-fired central hot water optimization system comprises a cold water main pipe 31, a primary heating circulating pipe 32, a secondary heating circulating pipe 33, a cold water supplementing electric valve 1, a hot water heat preservation water tank 6, a water heater circulating pump 3, a gas turbine set 4, a PLC controller 10, a water level sensor 2 and a temperature sensor 5; wherein:
the gas turbine set 4 is divided into a primary heating gas turbine set (reference numerals e-n in fig. 3 are primary heating gas turbine sets) and a secondary heating gas turbine set (reference numerals a-d in fig. 3 are secondary heating gas turbine sets);
one end of the cold water supplementing electric valve is connected to a municipal water supply network through the cold water main pipe, and the other end of the cold water supplementing electric valve is sequentially communicated with the primary heating gas unit and the hot water heat preservation water tank through the primary heating circulating pipe;
the water outlet end of the hot water heat-preservation water tank is sequentially communicated with the water heater circulating pump and the secondary heating gas engine unit through the secondary heating circulating pipe to form a closed loop;
the water level sensor and the temperature sensor are arranged in the hot water heat-preservation water tank and are electrically connected with the PLC;
and the PLC is electrically connected with the gas turbine unit, the cold water supplementing electric valve and the water heater circulating pump.
Preferably, the system further comprises a cold water branch pipe 34, a water shortage prevention and water replenishment electric valve 19 and a water shortage level sensor 18, wherein the cold water branch pipe is communicated between the cold water main pipe and the water inlet end of the hot water heat preservation water tank; the water shortage prevention cold water supplementing electric valve is installed on the cold water branch pipe, the water shortage water level sensor is installed in the hot water heat preservation water tank and is electrically connected with the PLC, and the PLC is electrically connected with the water shortage prevention cold water supplementing electric valve.
Preferably, the system further comprises a hot water pressure pump 7, a hot water pipe 35, a hot water supply pipe network, a water consumption terminal, a pressure gauge 20 and a frequency conversion controller 9, wherein the hot water pressure pump is communicated with the hot water heat preservation water tank through one end of the hot water pipe, the other end of the hot water pipe network is communicated with the hot water supply pipe network, the hot water supply pipe network is communicated with the water consumption terminal, the pressure gauge is installed on the hot water pipe, and the pressure gauge and the hot water pressure pump are respectively and electrically connected with the frequency conversion controller.
Preferably, the hot water supply system further comprises a water return pipe 36, a water return electromagnetic valve 14 and a water return temperature sensor 12, wherein one end of the water return pipe is communicated with the hot water heat-preservation water tank, the other end of the water return pipe is communicated with the hot water supply pipe network, the water return electromagnetic valve and the water return temperature sensor are installed on the water return pipe, and the water return electromagnetic valve and the water return temperature sensor are respectively and electrically connected with the PLC.
Preferably, a cold water bypass pipe 37 connected in parallel between the cold water main pipe and the cold water branch pipe, and a bypass valve 21 installed on the cold water bypass pipe and electrically connected to the PLC controller are further included.
Preferably, the system further comprises a cold water temperature sensor 13 and a cold water meter 22, wherein the cold water temperature sensor and the cold water meter are installed on the cold water main pipe and are electrically connected with the PLC.
Preferably, the water dispenser further comprises a cold water meter 23 which is installed on the cold water branch pipe and electrically connected with the PLC controller.
Preferably, the water heater further comprises a hot water meter 16, wherein the hot water meter is installed on the hot water pipe and is electrically connected with the PLC.
A control method S1 of an energy-saving and efficient gas-fired central hot water optimization system comprises the following steps:
(401) the water level sensor detects the water level of the hot water heat preservation water tank and transmits a detected water level signal of the hot water heat preservation water tank to the PLC;
(402) after receiving the water level signal, the PLC judges whether the water level signal is lower than a set limit water level, namely x is less than 10 percent of the water level of the hot water heat-preservation water tank,
(403) if so, starting the water shortage prevention cold water supplementing electric valve and the cold water supplementing electric valve, stopping other equipment,
(404) and stopping the water shortage prevention cold water supplementing electric valve and the cold water supplementing electric valve until the water level of the hot water heat preservation water tank reaches the set limit water level, namely when x is more than or equal to 10% and less than 25% of the water level of the hot water heat preservation water tank, and the water shortage prevention cold water supplementing electric valve and the cold water supplementing electric valve are started.
In the control method S1, when the water level of the hot water heat-preservation water tank is lower than the limit water level, the water shortage prevention and cold water supplementing electric valve and the cold water supplementing electric valve can work, and other equipment is automatically powered off and shut down for protection, so that accidents and accidents are avoided.
A control method S2 of an energy-saving and efficient gas-fired central hot water optimization system comprises the following steps:
(301) the water shortage level sensor detects the water level of the hot water heat preservation water tank and transmits a detected water level signal of the hot water heat preservation water tank to the PLC;
(302) after receiving the water level signal, the PLC judges whether the water level signal is lower than a set warning water level, namely x is more than or equal to 10% and less than 25% of the water level of the hot water heat preservation water tank,
(303) if so, the water shortage prevention cold water supplementing electric valve is opened, normal temperature water of the municipal water supply network flows into the hot water heat preservation water tank through the cold water branch pipe,
(104) and stopping the cold water supplementing electric valve until the water level of the hot water heat preservation water tank reaches the set warning water level, namely x is more than or equal to 25% and less than 60% of the water level of the hot water heat preservation water tank.
In the control method S2, when the water level of the hot water heat preservation water tank is lower than the warning water level, the water shortage prevention cold water supplementing electric valve is automatically opened, and water is supplemented to the hot water heat preservation water tank forcibly through the cold water branch pipe, so that water shortage and accidents are prevented.
A control method S3 of an energy-saving and efficient gas-fired central hot water optimization system comprises the following steps:
(101) the water level sensor detects the water level of the hot water heat preservation water tank and transmits a detected water level signal of the hot water heat preservation water tank to the PLC;
(102) after receiving the water level signal, the PLC judges whether the water level signal is lower than the set water level, namely, x is more than or equal to 25% and less than 60% of the water level of the hot water heat preservation water tank,
(103) if so, the cold water supplementing electric valve is opened, normal-temperature water of the municipal water supply network flows through the primary heating gas unit through the cold water main pipe and the primary heating circulating pipe, is heated by the primary heating gas unit and then flows into the hot water heat-preserving water tank,
(104) and stopping the water supplementing electric valve and the primary heating gas unit until the water level of the hot water heat-preserving water tank reaches the set water level, namely x is more than or equal to 60% of the water level of the hot water heat-preserving water tank.
Referring to fig. 4, a control method S4 of an energy-saving and efficient gas-fired central hot water optimization system includes the following steps:
(201) the temperature sensor detects the water temperature of the hot water heat-preservation water tank and transmits a detected water temperature signal of the hot water heat-preservation water tank to the PLC;
(202) after receiving the water temperature signal, the PLC controller judges whether the water temperature signal is lower than the set heating temperature, namely, is less than 50 ℃,
(203) if yes, judging whether the received water level signal is lower than the set water level, namely x is less than 60 percent of the water level of the hot water heat preservation water tank,
(204) if not, starting a circulating pump of the water heater and a secondary heating gas unit, enabling water flow in the hot water heat-preservation water tank to pass through the secondary heating gas unit, raising the temperature above the set temperature, namely, not less than 5 ℃, then supplementing the hot water heat-preservation water tank,
(205) and stopping the circulating pump of the water heater and the secondary heating gas unit until the water temperature of the hot water heat-preservation water tank reaches the set temperature, namely not less than 55 ℃.
A control method S5 of an energy-saving and efficient gas-fired central hot water optimization system comprises the following steps:
(501) the backwater temperature sensor detects the water temperature in the backwater pipe and transmits a detected water temperature signal in the backwater pipe to the PLC;
(502) after receiving the water temperature signal, the PLC judges whether the water temperature signal is lower than the set return water temperature, namely, is less than 38 ℃,
(503) if so, the water return electromagnetic valve is started, water in the water return pipe flows into the hot water heat preservation water tank through the water return pipe, water in the hot water heat preservation water tank flows into the hot water supply pipe network through the hot water pipe and then flows back into the water return pipe,
(504) and stopping the water return electromagnetic valve until the water temperature in the water return pipe reaches the set water stop temperature which is equal to or more than 40 ℃.
The working principle and the function of the invention are as follows:
(1) when the water level sensor detects that the water level of the hot water heat-preservation water tank is lower than the set water level, namely x is more than or equal to 25% and less than 60% of the water level of the hot water heat-preservation water tank, the water supplementing electric valve can be opened, supplemented tap water flows through the primary heating gas unit, and is directly supplemented into the hot water heat-preservation water tank after being heated and warmed by the primary heating gas unit. On one hand, as the water temperature of tap water is about 15-25 ℃, even if the outlet water temperature of the primary heating gas unit is only 55 ℃, the delta temperature difference is at least 25 ℃ or more, the primary heating gas unit can completely output 100% of full power, thereby achieving the purpose of making the best use of things and solving the problems of waste and redundancy caused by obvious idle power of the gas unit due to small temperature difference of inlet and outlet water of the gas unit; on the other hand, the supplemented tap water can flow into the hot water heat preservation water tank after being heated by the primary heating gas engine unit, the outlet water temperature of the primary heating gas engine unit is 55 ℃, the outlet water temperature is close to the water temperature in the hot water heat preservation water tank, the fluctuation of the water temperature is very small or even negligible, and the problems that the temperature difference between the tap water and the hot water heat preservation water tank is large and the fluctuation of the water temperature is large due to poor weather conditions such as low environmental temperature, low cold water temperature, large heat loss of a system and the like, the instant temperature drop of the hot water heat preservation water tank can be caused by directly injected low-temperature tap water, the instant temperature drop of the hot water heat preservation water tank can not be completely met by the heating capacity of the gas engine unit, and the water temperature in the.
(2) When the water level sensor detects that the water level of the hot water heat-preservation water tank is lower than a set water level, namely, x is more than or equal to 25% and less than 60% of the water level of the hot water heat-preservation water tank, the cold water supplementing electric valve can be opened, the pressure of a municipal water supply network is fully utilized to flow through the primary heating gas engine set for heating, a water heater circulating pump is not required to be started, the water heater circulating pump is started only when the water level of the hot water heat-preservation water tank reaches the set water level, namely, x is more than or equal to 60% of the water level of the hot water heat-preservation water tank, and the temperature. The scheme can greatly reduce the power of the circulating pump of the water heater, not only can consume the electric energy for starting the circulating pump of the water heater, but also avoids the faults and maintenance items possibly caused by the long-term operation of the circulating pump of the water heater, and also reduces the vibration and noise when the circulating pump of the water heater operates.
In summary, after reading the present disclosure, those skilled in the art can make various other corresponding changes without creative mental labor according to the technical solutions and concepts of the present disclosure, and all of them are within the protection scope of the present disclosure.
Claims (3)
1. The utility model provides an energy-conserving efficient gas central authorities hot water optimizing system which characterized in that: the system comprises a cold water main pipe, a primary heating circulating pipe, a secondary heating circulating pipe, a cold water supplementing electric valve, a hot water heat preservation water tank, a water heater circulating pump, a gas unit, a PLC (programmable logic controller), a water level sensor and a temperature sensor;
the gas unit is divided into a primary heating gas unit and a secondary heating gas unit;
one end of the cold water supplementing electric valve is connected to a municipal water supply network through the cold water main pipe, and the other end of the cold water supplementing electric valve is sequentially communicated with the primary heating gas unit and the hot water heat preservation water tank through the primary heating circulating pipe;
the water outlet end of the hot water heat-preservation water tank is sequentially communicated with the water heater circulating pump and the secondary heating gas engine unit through the secondary heating circulating pipe to form a closed loop;
the water level sensor and the temperature sensor are arranged in the hot water heat-preservation water tank and are electrically connected with the PLC; the PLC is electrically connected with the cold water supplementing electric valve and the water heater circulating pump;
the cold water heat preservation water tank is characterized by also comprising a cold water branch pipe, a water shortage prevention cold water supplementing electric valve and a water shortage level sensor, wherein the cold water branch pipe is communicated between the cold water main pipe and the water inlet end of the hot water heat preservation water tank;
the water shortage prevention cold water supplementing electric valve is installed on the cold water branch pipe, the water shortage level sensor is installed in the hot water heat preservation water tank and is electrically connected with the PLC, and the PLC is electrically connected with the water shortage prevention cold water supplementing electric valve;
the hot water pressure pump is communicated with the hot water heat-preservation water tank through one end of the hot water pipe, the other end of the hot water pipe is communicated with the hot water pipe network, the hot water pipe network is communicated with the water using terminal, the pressure gauge is installed on the hot water pipe, and the pressure gauge and the hot water pressure pump are respectively and electrically connected with the frequency conversion controller;
the hot water supply system is characterized by further comprising a water return pipe, a water return electromagnetic valve and a water return temperature sensor, wherein one end of the water return pipe is communicated with the hot water heat-preservation water tank, the other end of the water return pipe is communicated with the hot water supply pipe network, the water return electromagnetic valve and the water return temperature sensor are installed on the water return pipe, and the water return electromagnetic valve and the water return temperature sensor are respectively and electrically connected with the PLC;
the control method of the gas central hot water optimization system comprises the following steps:
s1: the water level sensor detects the water level of the hot water heat preservation water tank and transmits a detected water level signal of the hot water heat preservation water tank to the PLC; after receiving the water level signal, the PLC judges whether the water level signal is lower than a set limit water level or not; if so, starting the water shortage prevention cold water supplementing electric valve and the cold water supplementing electric valve; stopping the water shortage prevention cold water supplementing electric valve and the cold water supplementing electric valve until the water level of the hot water heat preservation water tank reaches the set limit water level;
s2: the water shortage level sensor detects the water level of the hot water heat preservation water tank and transmits a detected water level signal of the hot water heat preservation water tank to the PLC; after receiving the water level signal, the PLC judges whether the water level signal is lower than a set warning water level; if so, starting the water shortage prevention cold water supplementing electric valve, and allowing normal-temperature water of the municipal water supply network to flow into the hot water heat preservation water tank through the cold water branch pipe; stopping the cold water supplementing electric valve until the water level of the hot water heat preservation water tank reaches the set warning water level;
s3: the water level sensor detects the water level of the hot water heat preservation water tank and transmits a detected water level signal of the hot water heat preservation water tank to the PLC; after receiving the water level signal, the PLC judges whether the water level signal is lower than a set water level; if so, starting a cold water supplementing electric valve, enabling normal-temperature water of the municipal water supply network to flow through the primary heating gas unit through the cold water main pipe and the primary heating circulating pipe, heating by the primary heating gas unit, and then flowing into the hot water heat-preserving water tank; stopping the cold water supplementing electric valve and the primary heating gas unit until the water level of the hot water heat-preserving water tank reaches the set water level;
s4: the temperature sensor detects the water temperature of the hot water heat-preservation water tank and transmits a detected water temperature signal of the hot water heat-preservation water tank to the PLC; after receiving the water temperature signal, the PLC judges whether the water temperature signal is lower than a set heating temperature; if yes, judging whether the received water level signal is lower than a set water level; if not, starting a circulating pump of the water heater and a secondary heating gas unit, enabling water flow in the hot water heat-preservation water tank to pass through the secondary heating gas unit, rising the temperature to be above the set temperature, and then supplementing the hot water heat-preservation water tank; stopping the circulating pump of the water heater and the secondary heating gas unit until the water temperature of the hot water heat-preserving water tank reaches the set temperature;
s5: the water return temperature sensor detects the water temperature in the water return pipe and transmits a detected water temperature signal in the water return pipe to the PLC; after receiving the water temperature signal, the PLC judges whether the water temperature signal is lower than a set water return temperature, namely less than 38 ℃, if so, the water return electromagnetic valve is started, water in the water return pipe flows into the hot water heat preservation water tank through the water return pipe, water in the hot water heat preservation water tank flows into the hot water supply pipe network through the hot water pipe and then flows back into the water return pipe, and the water return electromagnetic valve is stopped until the water temperature in the water return pipe reaches the set water stop temperature, namely more than or equal to 40 ℃;
wherein the set limit water level is less than the set warning water level and less than the set water level.
2. An energy-saving and efficient gas-fired central hot water optimization system as claimed in claim 1, wherein: the cold water bypass pipe is connected between the cold water main pipe and the cold water branch pipe in parallel, and the bypass valve is installed on the cold water bypass pipe and electrically connected with the PLC.
3. An energy-saving and efficient gas-fired central hot water optimization system as claimed in claim 1, wherein: still include cold water temperature sensor and cold water meter, cold water temperature sensor and cold water meter are installed on the cold water is responsible for and with the PLC controller electricity is connected.
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| CN203421770U (en) * | 2013-06-28 | 2014-02-05 | 天津邦盛净化设备有限公司 | Constant-temperature constant-pressure centralized control device of hot water supply system |
| CN203719189U (en) * | 2014-03-07 | 2014-07-16 | 长沙飞升新能源科技有限公司 | Solar energy and air energy combination hot water control system |
| CN104848296A (en) * | 2014-10-28 | 2015-08-19 | 青岛万力科技有限公司 | Energy-saving comfortable full-automatic plate heat exchanger unit |
| CN106196258A (en) * | 2016-06-28 | 2016-12-07 | 四川自然道节能科技有限公司 | Heating water and saving energy system and control method thereof |
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