CN113418225A - Solar hot water energy-saving transformation system - Google Patents
Solar hot water energy-saving transformation system Download PDFInfo
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- CN113418225A CN113418225A CN202110671922.5A CN202110671922A CN113418225A CN 113418225 A CN113418225 A CN 113418225A CN 202110671922 A CN202110671922 A CN 202110671922A CN 113418225 A CN113418225 A CN 113418225A
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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
- F24D17/0015—Domestic hot-water supply systems using solar energy
- F24D17/0021—Domestic hot-water supply systems using solar energy with accumulation of the heated water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/50—Solar heat collectors using working fluids the working fluids being conveyed between plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
- F24S50/40—Arrangements for controlling solar heat collectors responsive to temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
- F24S80/30—Arrangements for connecting the fluid circuits of solar collectors with each other or with other components, e.g. pipe connections; Fluid distributing means, e.g. headers
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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
- F24D2200/00—Heat sources or energy sources
- F24D2200/14—Solar energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/20—Solar thermal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention relates to a solar hot water energy-saving reconstruction system, which is designed for solving the technical problems of inconvenient reconstruction and upgrade, higher production, poorer energy-saving effect, joint regulation and joint control effect and inconvenient remote monitoring and management of the conventional similar system. Its main points are that this system includes roof PLC remote control case and basement PLC remote control case, solar panel passes through the solar energy collection circulating pump and is connected with balanced heat storage water tank, boiler room life hot water system includes two living hot water boiler and three living hot water circulating pumps, boiler room life hot water system's hot water is sent low district hot-water cylinder and high district hot-water cylinder system through living hot water circulating pump and is carried out the heat transfer, low district hot-water circulating pump and high district hot-water circulating pump by the secondary side again carry life hot water to the heat supply end, the solar heat medium circulating pump of the balanced heat storage water tank of hot-water cylinder wireless connection and plate heat exchanger's hot-water cylinder hot water circulating pump, plate heat exchanger passes through the hot-water cylinder hot water circulating pump and is connected with the hot-water cylinder.
Description
Technical Field
The invention relates to a solar water heating system, in particular to a solar water heating energy-saving reconstruction system.
Background
The solar water heating system collects solar heat by using a solar heat collector, enables solar light energy to be fully converted into heat energy under the irradiation of sunlight, automatically controls functional components such as a circulating pump or an electromagnetic valve through a control system to transmit the heat collected by the system to a large water storage and heat preservation water tank, and heats water in the water storage and heat preservation water tank to form stable quantitative energy equipment by matching with equivalent energy sources such as electric power, gas, fuel oil and the like. The system can provide hot water for production and living, can also be used as a cold and heat source in other solar energy utilization forms, and is an application product which has the most economic value, the most mature technology and the commercialization in the application and development of solar heat energy. At present, large public facilities such as hospitals and the like are generally provided with two sets of systems, one set of system is a system consisting of a domestic hot water boiler and solar energy thereof, and the consumption of gas of the domestic hot water boiler is reduced by utilizing the solar energy to the greatest extent possible through the coordination control of the domestic hot water boiler and the solar energy system; the other system is a hot water boiler of the central air-conditioning system, which mainly provides a heat source for the central air-conditioning system. For example, the invention discloses a method and an application system for improving the heat efficiency and the heat utilization rate of a solar water heating system, as applied to the publication No. 2014.04.23 of the application No. 201410004536.0 in Chinese patent literature; for example, the invention is named as a forced circulation and indirect heat exchange type solar water heating system and a control method thereof, which is disclosed in Chinese patent document with the application number 201110007282.4 and the application publication date 2011.06.01. The two systems, the patent documents and the existing similar products can only realize the remote monitoring function generally, but do not have the functions of remotely and automatically starting and stopping the boiler and adjusting the frequency of the hot water pump, so that the energy-saving effect is poor.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a solar hot water energy-saving reconstruction system for the field, so that the technical problems of inconvenient reconstruction and upgrade, higher production, poorer energy-saving effect, poorer joint regulation and joint control effect and inconvenient remote monitoring and management of the conventional similar system are solved. The purpose is realized by the following technical scheme.
A solar hot water energy-saving reconstruction system comprises a solar heat collecting plate, a balance heat storage water tank, a plate heat exchanger, a low-region hot water tank, a high-region hot water tank and a hot water tank, wherein the low-region hot water tank is provided with a low-region hot water circulating pump, the high-region hot water tank is provided with a high-region hot water circulating pump, the hot water tank is provided with a hot water tank hot water circulating pump, the balance heat storage water tank is provided with a liquid level transmitter, a temperature sensor, the solar heat collecting circulating pump and a solar heat medium circulating pump, the high-region hot water circulating pump is provided with a temperature sensor T9, an electric switch valve M1 and an expansion water tank, the low-region hot water circulating pump is respectively provided with a temperature sensor T8, an electric switch valve M1 and the expansion water tank, the low-region hot water tank and the high-region hot water tank are respectively provided with an electric switch valve, a pressure sensor and a temperature sensor, the electric switch valve is wirelessly connected with the temperature sensor, the hot water tank is provided with a temperature sensor, the temperature sensor is wirelessly connected with the solar heat medium circulating pump and the hot water circulating pump of the hot water tank, the temperature sensors are respectively arranged between the plate-type heat exchanger and the hot water tank, between the hot water circulating pump of the hot water tank and between the plate-type heat exchanger and the solar heat medium circulating pump, and the temperature sensor is arranged between the balance heat storage water tank and the solar heat collecting plate; the solar heat collection system is characterized in that the solar heat collection plate is provided with four solar heat collection plates, the solar heat collection plates are connected with a balance heat storage water tank through a solar heat collection circulating pump, and the balance heat storage water tank is provided with an electric switching valve, a liquid level transmitter LT1, a temperature sensor T1, a temperature sensor T2 and an electric switching valve M1; the boiler room domestic hot water system comprises two domestic hot water boilers and three domestic hot water circulating pumps, hot water of the boiler room domestic hot water system is sent to a low-region hot water tank and a high-region hot water tank system through the domestic hot water circulating pumps for heat exchange, and then the domestic hot water is conveyed to a heat supply end by the low-region hot water circulating pump and the high-region hot water circulating pump on the secondary side, a heat receiving exchanger room of the boiler room domestic hot water system is provided with a temperature sensor T13 and a pressure sensor P01, and the boiler room domestic hot water system is connected with a municipal natural gas system; the hot water tank is wirelessly connected with a solar heat medium circulating pump of the balanced heat storage water tank and a hot water tank hot water circulating pump of the plate heat exchanger, the plate heat exchanger is connected with the hot water tank through the hot water tank hot water circulating pump, the plate heat exchanger is provided with a temperature sensor T10, a temperature sensor T11 and a temperature sensor T12, the hot water tank is connected with the high-region hot water tank and the low-region hot water tank, the roof PLC remote control box is connected with the temperature sensor T1, the temperature sensor T2, the liquid level transmitter LT1, the electric switch valve M1, the solar heat collection circulating pump and the solar heat medium circulating pump through circuits, the basement PLC remote control box is connected with the hot water tank hot water circulating pump, the high-region hot water circulating pump, the system comprises a hot water tank, two low-region hot water tanks and two high-region hot water tanks, wherein a flow guide floating coil type semi-positive displacement water heater is connected behind the hot water tanks in series. Therefore, the solar system is composed of the solar heat collection plate, the solar heat collection circulating pump and the balance heat storage water tank on the primary side, hot water is collected by the solar system, and the collected hot water is stored in the balance heat storage water tank through the solar heat collection circulating pump P6. The primary side of the plate-type heat exchanger consists of a balance heat storage water tank, a solar heat medium circulating pump and a plate-type heat exchanger, the solar heat medium circulating pump P5 sends hot water in the balance heat storage water tank to the plate-type heat exchanger of the basement, and the plate-type heat exchanger exchanges heat with the hot water tank on the primary side to utilize the heat of solar energy; the secondary side of the plate heat exchanger consists of a hot water tank, a plate heat exchanger and a hot water circulating pump P8 of the hot water tank. The high-region hot water tank system consists of hot water provided by a primary side boiler room domestic hot water system, a secondary side high-region hot water circulating pump, a pipeline, an electromagnetic valve and the like; the low-region hot water tank system consists of hot water provided by a boiler room on the primary side and a low-region hot water circulating pump on the secondary side. The boiler room domestic hot water system consists of two domestic hot water boilers and three domestic hot water circulating pumps, hot water generated by the boiler room is sent to hot water tank systems of a low area and a high area through the domestic hot water circulating pumps for heat exchange, and then the domestic hot water is sent to a hospital ward building through a secondary side circulating pump.
And inlets of the low-region hot water circulating pump and the high-region hot water circulating pump are respectively provided with a proportional integral electric regulating ball valve, heat medium water supply, heat medium water return, a temperature sensor T4, a temperature sensor T5, a temperature sensor T6, a temperature sensor T7 and a temperature monitoring display instrument. The weak current water level monitoring of the circuit is laid, the temperature monitoring display instrument is installed on a wall body nearby, signals are transmitted to the management center, the low-region hot water tank and the low-region hot water circulating pump can be switched on and off manually according to the using condition, the expansion water tank and the constant-pressure water supply device (cold water) are connected with a living water supply pipe, the hot water return pipe is connected with the hot water system, and the temperature sensor T8 is connected with the low-region hot water circulating pump.
The domestic hot water circulating pumps are respectively provided with a frequency converter. Therefore, hot water is pumped to the low-region hot water tank and the high-region hot water tank through the domestic hot water circulating pump, and a frequency control signal of the frequency converter needs to be accessed to the central air-conditioning group control system; meanwhile, the frequency of the frequency converter is subjected to PID adjustment according to temperature difference and pressure difference sensors arranged on a water supply and return main pipe, and constant control of the temperature difference and the pressure difference is realized.
The roof PLC remote control box and the basement PLC remote control box are connected with the central air-conditioning group control system through lines, and a central air-conditioning boiler and a domestic hot water boiler of the central air-conditioning group control system are connected into a municipal natural gas system and are respectively provided with a natural gas meter. Therefore, the system accesses data into a central air-conditioning group control system platform for unified management, a natural gas meter is arranged in front of a central air-conditioning boiler and a domestic hot water boiler, the central air-conditioning group control system is communicated with the natural gas meter, the central air-conditioning group control system collects gas meter data in real time and stores the gas meter data into a database, and printing output through an EXCEL report is supported.
When the temperature T1 of the balance heat storage water tank is higher than the awakening temperature by 38 degrees or the temperature T1 of the balance heat storage water tank minus the temperature T3 of the domestic heat storage water tank is higher than the awakening temperature by 3.5 degrees, a solar heat medium circulating pump P5 is started; when the temperature T1 of the balance heat storage water tank is lower than the dormancy temperature by 38.5 ℃, the solar heat medium circulating pump P5 and the hot water circulating pump of the hot water tank are turned off; meanwhile, the solar water supply temperature T2 is lower than the dormancy temperature by 38 ℃, the temperature T1 of the solar water supply temperature T2 minus the temperature of the balance heat storage water tank is smaller than the awakening temperature difference by 3.5 ℃, and the solar heat collection circulating pump P6 enters a pre-dormancy standby state; the solar water supply temperature T2 is greater than the awakening temperature by 45 degrees or the solar water supply temperature T2 minus the temperature T1 of the balance heat storage water tank is greater than the awakening temperature difference by 3.5 degrees, and the solar heat collection circulating pump P6 enters a starting operation state.
When temperature sensors corresponding to the primary side and the secondary side of the plate-type heat exchanger and the primary side and the secondary side of the high-area hot water tank and the low-area hot water tank are higher than the pump starting temperature by 35 ℃, the low-area hot water circulating pump or the high-area hot water circulating pump is started; when the temperature is 30 ℃ lower than the pump stopping temperature, the low-region hot water circulating pump or the high-region hot water circulating pump is closed; when the solar hot water is not supplied enough, the proportional integral electric valve arranged in the low-region hot water tank or the high-region hot water tank is compared with an actual value according to a temperature set value of the low-region water tank, and when the actual value is lower than the set value, the opening degree of the proportional integral electric valve of the low-region hot water tank or the high-region hot water tank is increased; when the actual value is higher than the set value, the opening degree of a proportional integral electric valve of the low-region hot water tank or the high-region hot water tank is reduced; and the water supply temperature is kept constant at 40 ℃, and the corresponding electric proportional valve is in a closed state.
When the temperature of the four hot water tanks of the low-region hot water tank or the high-region hot water tank reaches 60 ℃, one domestic hot water circulating pump is closed, one domestic hot water circulating pump is started, and when the temperature of the four hot water tanks reaches 65 ℃, all the hot water domestic hot water circulating pumps stop running; when the temperature of any hot water tank is detected to be lower than 55 ℃, one domestic hot water circulating pump is started, and when the temperature of any hot water tank is detected to be lower than 50 ℃, two domestic hot water circulating pumps are started; when all the water pumps stop operating, the boiler is stopped in a linkage manner; when the water pump operates, the boiler is started in a linkage manner.
The invention has reasonable structural design, good stability and safety, better energy-saving effect, good overall harmony and scientificity and more convenient remote monitoring and management; the solar energy hot water boiler is suitable for being used as a domestic hot water boiler of a large-scale public facility and a system formed by solar energy thereof, and is suitable for improving and upgrading a hot water boiler system of a central air-conditioning system and improving the structures of similar products thereof.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural view of the working principle of fig. 1.
FIG. 3 is a schematic diagram of the control interface structure of the present invention.
Fig. 4 is a schematic structural diagram of a domestic hot water system of a boiler room.
Figure number and name: 1. solar energy heat collection board, 2, liquid level transmitter, 3, balanced heat storage water tank, 4, temperature sensor, 5, solar energy heat collection circulating pump, 6, solar heat medium circulating pump, 7, plate heat exchanger, 8, hot-water tank hot water circulating pump, 9, high district hot water circulating pump, 10, low district hot water circulating pump, 11, pressure sensor, 12, electrical control valve, 13, low district hot-water tank, 14, electric switch valve, 15, high district hot-water tank, 16, hot-water tank, 17, roof PLC remote control case, 18, basement PLC remote control case, 19, boiler room life hot water system.
Detailed Description
The structure of the present invention will now be further described with reference to the accompanying drawings. As shown in fig. 1-4, the system comprises a solar heat collecting plate 1, a balance heat storage water tank 3, a plate heat exchanger 7, a low-region hot water tank 13, a high-region hot water tank 15 and a hot water tank 16, wherein the low-region hot water tank is provided with a low-region hot water circulating pump 10, the high-region hot water tank is provided with a high-region hot water circulating pump 9, the hot water tank is provided with a hot water circulating pump 8, the balance heat storage water tank is provided with a liquid level transmitter 2, a temperature sensor 4, a solar heat collecting circulating pump 5 and a solar heat medium circulating pump 6, the high-region hot water circulating pump is provided with a temperature sensor T9, an electric switch valve M1 and an expansion water tank, the low-region hot water circulating pump is respectively provided with a temperature sensor T8, an electric switch valve M1 and the expansion water tank, the low-region hot water tank and the high-region hot water tank are respectively provided with an electric switch valve 14, an electric control valve 12, a pressure sensor 11 and a temperature sensor, the electric control valve is wirelessly connected with the temperature sensor, the hot water tank is provided with a temperature sensor, the temperature sensor is wirelessly connected with the solar heat medium circulating pump and the hot water circulating pump of the hot water tank, the temperature sensors are respectively arranged between the plate-type heat exchanger and the hot water tank, between the hot water circulating pump of the hot water tank and between the plate-type heat exchanger and the solar heat medium circulating pump, and the temperature sensors are arranged between the balance heat storage water tank and the solar heat collecting plate. The solar heat collection plate is provided with four solar heat collection plates, the solar heat collection plates are connected with the balance heat storage water tank through a solar heat collection circulating pump, and the balance heat storage water tank is provided with an electric switching valve, a liquid level transmitter LT1, a temperature sensor T1, a temperature sensor T2 and an electric switching valve M1; boiler room life hot water system 19 includes two life hot water boiler and three life hot water circulating pump, boiler room life hot water system's hot water is sent low district hot-water cylinder and high district hot-water cylinder system through life hot water circulating pump and is carried out the heat transfer, low district hot water circulating pump and the high district hot-water circulating pump by the secondary side carry life hot water to the heat supply end again, boiler room life hot water system connect the heat exchanger room and be equipped with temperature sensor T13 and pressure sensor P01, boiler room life hot water system connects municipal natural gas system. Solar heat-medium circulating pump of hot-water tank wireless connection equilibrium heat storage water tank and plate heat exchanger's hot-water tank hot water circulating pump, plate heat exchanger passes through hot-water tank hot water circulating pump and is connected with the hot-water tank, plate heat exchanger is equipped with temperature sensor T10, temperature sensor T11, temperature sensor T12, the hot-water tank is connected with high district hot-water tank, low district hot-water tank, roof PLC remote control case 17 passes through circuit and degree sensor T1, temperature sensor T2, liquid level transmitter LT1, electric switch valve M1, solar energy collection circulating pump, solar heat-medium circulating pump is connected, basement PLC remote control case 18 passes through circuit and hot-water tank hot water circulating pump, high district hot water circulating pump, low district hot water circulating pump, boiler room life hot water system. The system comprises a hot water tank, two low-region hot water tanks and two high-region hot water tanks, wherein a diversion floating coil type semi-positive displacement water heater is connected behind the hot water tanks in series; the inlets of the low-region hot water circulating pump and the high-region hot water circulating pump are respectively provided with a proportional integral electric regulating ball valve, heat medium water supply, heat medium water return, a temperature sensor T4, a temperature sensor T5, a temperature sensor T6, a temperature sensor T7 and a temperature monitoring display instrument; the domestic hot water circulating pumps are respectively provided with a frequency converter; the roof PLC remote control box and the basement PLC remote control box are connected with the central air-conditioning group control system through lines, and a central air-conditioning boiler and a domestic hot water boiler of the central air-conditioning group control system are connected into a municipal natural gas system and are respectively provided with a natural gas meter.
This solar energy system and boiler system collect heat heating cold water and store as the heat medium in hot water balance tank for solar panel, pressurize to the cold water in the underground hot water pump room board heat exchanger heating hot-water tank through the heat medium circulating pump and come for whole hot water system supply hot water to establish ties water conservancy diversion floating coil cast half-capacity formula water heater behind the hot-water tank, under the not enough circumstances of solar energy, the high temperature hot water that provides through the boiler room comes for the hot-water heating system heat supply.
The primary side control requirements of the solar heat collecting plate are as follows: the solar energy system once inclines to be become by solar panel, solar energy collection circulating pump, balanced heat storage water tank group, and solar energy collects hot water, through solar panel collection circulating pump P6, stores the hot water of collecting in balanced heat storage water tank. The start and stop of the primary circulating pumps P5 and P8 in the system are controlled by the water temperature in the balance hot-storage water tank. The solar heat collection circulating pump P6 is used in the daytime and stopped at night and is controlled by T2. The solar water supply temperature T2 is lower than the dormancy temperature by 38 degrees (adjustable), the temperature T1 of the solar water supply temperature T2 minus the temperature of the balance heat storage water tank is smaller than the awakening temperature difference by 3.5 degrees (adjustable), and the solar heat collection circulating pump P6 enters a pre-dormancy standby state. The solar water supply temperature T2 is greater than the awakening temperature by 45 degrees (adjustable) or the temperature T2 of the solar water supply temperature minus the temperature T1 of the balance heat storage water tank is greater than the awakening temperature difference by 3.5 degrees (adjustable), and the solar heat collection circulating pump P6 enters a starting operation state. Balanced heat storage water tank sets up level sensor LT, and when the liquid level value was less than 0.6 meter, close solar energy collection circulating pump P6, prevents that the pump from beating futilely.
The primary side control requirements of a plate heat exchanger are as follows: the primary side of the plate heat exchanger consists of a balance heat storage water tank, a solar heat medium circulating pump and a plate heat exchanger, the solar heat medium circulating pump P5 sends hot water in the balance heat storage water tank to the plate heat exchanger of the basement, and the plate heat exchanger exchanges heat with the hot water tank system on the primary side to utilize heat of solar energy. When the temperature T1 of the balance heat storage water tank is higher than the awakening temperature by 38 degrees (adjustable) or the temperature T1 of the balance heat storage water tank minus the temperature T3 of the domestic heat storage water tank is higher than the awakening temperature by 3.5 degrees (adjustable), the solar heat medium circulating pump P5 is started. And when the temperature T1 of the balance heat storage water tank is lower than the dormancy temperature by 38.5 degrees (adjustable), the solar heat medium circulating pump P5 and the hot water circulating pump of the hot water tank are turned off. Balanced heat storage water tank sets up level sensor LT, when the liquid level value is less than 0.6 meter, closes solar energy collection circulating pump P6 and hot-water tank hot water circulating pump, prevents that the pump from beating futilely.
The secondary side control requirements of the plate heat exchanger are as follows: the secondary side of the plate type heat exchanger consists of a hot water tank, a plate type heat exchanger and a hot water circulating pump P8 of the hot water tank, and when the temperature T1 of the balance heat storage water tank is 38 degrees higher than the awakening temperature (adjustable) or the temperature T1 of the balance heat storage water tank minus the temperature T3 of the life heat storage water tank is 3.5 degrees higher than the awakening temperature (adjustable), the solar heat medium circulating pump P5 and the hot water circulating pump of the hot water tank are started. And when the temperature T1 of the balance heat storage water tank is lower than the dormancy temperature by 38.5 degrees (adjustable), the solar heat medium circulating pump P5 and the hot water circulating pump of the hot water tank are turned off. When the solar heat medium circulating pump operates and the temperature of the plate once water supply T11 is reduced and the temperature of the plate once water return T12 is less than or equal to the dormancy temperature difference by 1.2 degrees (adjustable), the solar heat medium circulating pump enters a dormancy standby state. And when the solar heat medium circulating pump runs and the duration time of the dormant standby state exceeds 10 minutes (is adjustable), the solar heat medium circulating pump and the hot water circulating pump of the hot water tank are closed. Balanced heat storage water tank sets up level sensor LT, when the liquid level value is less than 0.6 meter, closes solar energy collection circulating pump P6 and hot-water tank hot water circulating pump, prevents that the pump from beating futilely.
The control requirements of the high-area hot water tank system are as follows: the high-region hot water tank system comprises hot water provided by a boiler room on the primary side and a high-region hot water circulating pump, a pipeline, an electromagnetic valve and the like on the secondary side, the high-region hot water tank supplies domestic hot water for 10 th-17 th buildings at 6 am-8 am, and 18 m night: 00-22 o' clock at night, domestic hot water is supplied, the time period is set by a system interface, and when the temperature T5 of the first high-area water tank, the temperature T4 of the second high-area water tank or the temperature T3 of the domestic hot water storage tank is 35 degrees (adjustable) higher than the starting temperature, the high-area hot water circulating pump is started. When the temperature of the first high-region water tank T5 or the temperature of the second high-region water tank T4 or the temperature of the domestic hot water storage tank T3 is 30 degrees lower than the pump stop temperature (adjustable), the high-region hot water circulating pump is closed, and the hot water inlet and outlet valve V04 is synchronously closed. When the solar hot water is not supplied enough, a proportional integral electric valve arranged in the high-area hot water tank compares the set value of the temperature of the high-area water tank with an actual value, and when the actual value is lower than the set value, the opening degree of the proportional integral electric valve is increased; when the actual value is higher than the set value, the opening degree of the proportional integral electric valve is reduced; the temperature of the supplied water is ensured to be constant at 40 degrees (adjustable). The first low zone hot water tank is set to 40 degrees, the actual temperature reaches 40 degrees, and the electric proportional valve VF03 is in a closed state.
The control requirements of the low-region hot water tank system are as follows: the low-region hot water tank system consists of hot water provided by a boiler room at the primary side and a low-region hot water circulating pump at the secondary side, wherein the hot water supply time of the low-region 1-10 floors is 4: 00-23 o' clock at night, the time period is set on a system interface, and when the temperature of the first low-region water tank T7 or the temperature of the second low-region water tank T6 or the temperature of the domestic hot water storage tank T3 is 35 degrees higher than the starting temperature (adjustable), the low-region hot water circulating pump is started. When the temperature of the first low-region water tank T7, the temperature of the second low-region water tank T6 or the temperature of the domestic hot water storage tank T3 is 30 degrees lower than the pump stopping temperature (adjustable), the low-region hot water circulating pump is turned off. When the solar hot water is not supplied enough, a proportional integral electric valve arranged in the low-region hot water tank compares the set value of the temperature of the low-region water tank with an actual value, and when the actual value is lower than the set value, the opening degree of the proportional integral electric valve is increased; when the actual value is higher than the set value, the opening degree of the proportional integral electric valve is reduced; the temperature of the supplied water is ensured to be constant at 40 degrees (adjustable). The first low zone hot water tank is set to 40 degrees, the actual temperature reaches 40 degrees, and the electric proportional valve VF03 is in a closed state.
The control requirements of the domestic hot water system of the boiler room are as follows: the boiler room domestic hot water system consists of two domestic hot water boilers and three domestic hot water circulating pumps, hot water generated by the boiler room is sent to hot water tank systems of a low area and a high area through the domestic hot water circulating pumps for heat exchange, and then the domestic hot water is sent to a hospital ward building through a secondary side circulating pump. When the system operates, two domestic hot water circulating pumps are started at first, when the temperatures of four hot water tanks in a low area and a high area reach 60 degrees (adjustable), one domestic hot water circulating pump is closed, one domestic hot water circulating pump is started, and when the temperatures of the four hot water tanks reach 65 degrees (adjustable), all the hot water domestic hot water circulating pumps stop operating. When the temperature of any hot water tank is detected to be lower than 55 degrees (adjustable), one domestic hot water circulating pump is started, and when the temperature of any hot water tank is detected to be lower than 50 degrees (adjustable), two domestic hot water circulating pumps are started. When all the water pumps stop operating, the boiler is stopped in a linkage manner; when the water pump operates, the boiler is started in a linkage manner. Three domestic hot water circulating pumps are respectively provided with a frequency converter, and the frequency control signals of the frequency converters are required to be connected into a central air-conditioning group control system. And detecting the pressure difference of supply water and return water of the boiler, and adjusting the frequency of a domestic hot water circulating pump of the boiler. When the detected pressure difference exceeds 2BAR (adjustable), the domestic hot water and hot water circulating pump stops running, thereby playing a role in protection.
The control requirements of the low-region hot water tank and the high-region hot water tank are as follows: the low-region hot water tank and the high-region hot water tank are respectively provided with a temperature sensor, and the inlets are provided with proportional integral electric regulating ball valves. And comparing and calculating the temperature sensors of the low-region hot water tank and the high-region hot water tank with the set temperature, and adjusting the opening of the inlet proportional integral electric adjusting ball valve to keep the temperatures of the low-region hot water tank and the high-region hot water tank constant at the set values. When the solar hot water is not supplied enough, the proportional integral electric valves arranged in the low-zone hot water tank and the high-zone hot water tank are compared with an actual value according to the temperature set values of the low-zone water tank and the high-zone water tank, and when the actual value is lower than the set value, the opening degree of the proportional integral electric valve is increased; when the actual value is higher than the set value, the opening degree of the proportional-integral electric valve is reduced, and the water supply temperature is kept constant at 40 degrees (adjustable). The first low zone hot water tank is set to 40 degrees, the actual temperature reaches 40 degrees, and the electric proportional valve VF03 is in a closed state.
The control requirements of the domestic hot water boiler and the domestic hot water circulating pump matched with the domestic hot water boiler are as follows: the domestic hot water boiler is matched with two domestic hot water boilers and three domestic hot water circulating pumps, and hot water is pumped to the low-region hot water tank and the high-region hot water tank through the domestic hot water circulating pumps. The frequency of the frequency converter is subjected to PID adjustment according to a temperature difference and pressure difference sensor arranged on a water supply and return main pipe, so that constant control of the temperature difference and the pressure difference of the water supply and return is realized. Starting and stopping the boiler according to the temperature of the water outlet main pipe; the two boilers are mutually standby, and when one boiler fails, the standby boiler is automatically started; the three hot water pumps are used as one standby hot water pump, and when one hot water pump fails, the standby hot water pump is automatically started.
Meanwhile, the energy conservation of natural gas consumption of the air-conditioning hot water boiler is realized by transforming the system, the solar system and the hot water boiler system are required to be connected with a central air-conditioning group control system platform for unified management, an intelligent system is adopted for centralized control after the project is implemented, and the annual comprehensive energy-saving rate of natural gas consumption of the central air-conditioning system and the domestic hot water boiler can reach more than 23%. The system is connected to a municipal natural gas system, natural gas meters are respectively arranged in front of a central air-conditioning boiler and a domestic hot water boiler, a central air-conditioning group control system is communicated with the natural gas meters, the central air-conditioning group control system collects gas meter data in real time and stores the data into a database, and printing output through EXCEL reports is supported.
Claims (7)
1. The utility model provides a solar hot water energy-saving transformation system, this system includes solar panel (1), balanced heat storage water tank (3), plate heat exchanger (7), low zone hot-water tank (13), high zone hot-water tank (15) and hot-water tank (16), low zone hot-water tank is equipped with low zone hot water circulating pump (10), high zone hot-water tank is equipped with high zone hot water circulating pump (9), the hot-water tank is equipped with hot-water tank hot-water circulating pump (8), balanced heat storage water tank is equipped with liquid level transmitter (2), temperature sensor (4), solar panel heat collection circulating pump (5) and solar heat-transfer medium circulating pump (6), high zone hot water circulating pump is equipped with temperature sensor T9, electric switch valve M1, the inflation water pitcher, low zone hot-water circulating pump is equipped with temperature sensor T8 respectively, electric switch valve M1, the inflation, low zone hot-water tank and high zone hot-water tank are equipped with electric switch valve (14) respectively, The solar energy heat storage system comprises an electric regulating valve (12), a pressure sensor (11) and a temperature sensor, wherein the electric regulating valve is wirelessly connected with the temperature sensor, a hot water tank is provided with the temperature sensor, the temperature sensor is wirelessly connected with a solar heat medium circulating pump and a hot water circulating pump of the hot water tank, the temperature sensors are respectively arranged between a plate type heat exchanger and the hot water tank, between the plate type heat exchanger and the hot water circulating pump of the hot water tank and between the plate type heat exchanger and the solar heat medium circulating pump, and the temperature sensor is arranged between a balance heat storage water tank and a solar heat collection plate; the solar heat collection system is characterized in that the solar heat collection plate (1) is provided with four solar heat collection plates, the solar heat collection plates are connected with a balance heat storage water tank (3) through a solar heat collection circulating pump (6), and the balance heat storage water tank is provided with an electric switching valve, a liquid level transmitter LT1, a temperature sensor T1, a temperature sensor T2 and an electric switching valve M1; the boiler room domestic hot water system (19) comprises two domestic hot water boilers and three domestic hot water circulating pumps, hot water of the boiler room domestic hot water system is sent to a low-region hot water tank and a high-region hot water tank system through the domestic hot water circulating pumps for heat exchange, then the domestic hot water is conveyed to a heat supply end by a low-region hot water circulating pump (10) and a high-region hot water circulating pump (9) on the secondary side, a heat receiving exchanger room of the boiler room domestic hot water system is provided with a temperature sensor T13 and a pressure sensor P01, and the boiler room domestic hot water system is connected with a municipal natural gas system; a hot water tank (16) is in wireless connection with a solar heat medium circulating pump for balancing a heat storage water tank and a hot water tank hot water circulating pump (8) of a plate-type heat exchanger (7), the plate-type heat exchanger is connected with the hot water tank (16) through the hot water tank hot water circulating pump, the plate-type heat exchanger is provided with a temperature sensor T10, a temperature sensor T11 and a temperature sensor T12, the hot water tank is connected with a high-region hot water tank (15) and a low-region hot water tank (13), a roof PLC remote control box (17) is connected with the temperature sensor T1, the temperature sensor T2, a liquid level transmitter LT1, an electric switch valve M1, a solar heat collection circulating pump and the solar heat medium circulating pump through circuits, a basement PLC remote control box (18) is connected with the hot water tank hot water circulating pump, the high-region hot water circulating pump, the low-region hot water circulating pump, a boiler room living hot water system through circuits, corresponding pressure sensors (11), an electric regulating valve (12), The electric switch valve (14) is connected with the temperature sensor, the system comprises a hot water tank, two low-region hot water tanks and two high-region hot water tanks, and a diversion floating coil type semi-positive displacement water heater is connected behind the hot water tanks in series.
2. The solar hot water energy-saving modification system according to claim 1, wherein inlets of the low-zone hot water circulating pump (10) and the high-zone hot water circulating pump (9) are respectively provided with a proportional-integral electric regulating ball valve, a heating medium water supply, a heating medium water return, a temperature sensor T4, a temperature sensor T5, a temperature sensor T6, a temperature sensor T7 and a temperature monitoring display.
3. The solar hot water energy-saving reconstruction system according to claim 1, wherein the domestic hot water circulating pumps are respectively provided with a frequency converter.
4. The solar hot water energy-saving reconstruction system according to claim 1, characterized in that the roof PLC remote control box (17) and the basement PLC remote control box (18) are connected with a central air-conditioning group control system through lines, and a natural gas meter is respectively arranged on a central air-conditioning boiler and a domestic hot water boiler of the central air-conditioning group control system which are connected with a municipal natural gas system.
5. The solar hot water energy-saving modification system according to claim 1, characterized in that when the temperature T1 of the balanced hot water storage tank (3) is 38 degrees greater than the awakening temperature or the temperature T1 of the balanced hot water storage tank minus the temperature T3 of the domestic hot water storage tank is 3.5 degrees greater than the awakening temperature, the solar heat medium circulating pump P5 is turned on; when the temperature T1 of the balance heat storage water tank is lower than the dormancy temperature by 38.5 ℃, the solar heat medium circulating pump P5 and the hot water circulating pump of the hot water tank are turned off; meanwhile, the solar water supply temperature T2 is lower than the dormancy temperature by 38 ℃, the temperature T1 of the solar water supply temperature T2 minus the temperature of the balance heat storage water tank is smaller than the awakening temperature difference by 3.5 ℃, and the solar heat collection circulating pump P6 enters a pre-dormancy standby state; the solar water supply temperature T2 is greater than the awakening temperature by 45 degrees or the solar water supply temperature T2 minus the temperature T1 of the balance heat storage water tank is greater than the awakening temperature difference by 3.5 degrees, and the solar heat collection circulating pump P6 enters a starting operation state.
6. The solar hot water energy-saving reconstruction system according to claim 1, characterized in that when temperature sensors corresponding to the primary side and the secondary side of the plate heat exchanger (7) and the primary side and the secondary side of the high-region hot water tank and the low-region hot water tank are higher than a pump starting temperature by 35 degrees, the low-region hot water circulating pump or the high-region hot water circulating pump is started; when the temperature is 30 ℃ lower than the pump stopping temperature, the low-region hot water circulating pump or the high-region hot water circulating pump is closed; when the solar hot water is not supplied enough, the proportional integral electric valve arranged in the low-region hot water tank or the high-region hot water tank is compared with an actual value according to a temperature set value of the low-region water tank, and when the actual value is lower than the set value, the opening degree of the proportional integral electric valve of the low-region hot water tank or the high-region hot water tank is increased; when the actual value is higher than the set value, the opening degree of a proportional integral electric valve of the low-region hot water tank or the high-region hot water tank is reduced; and the water supply temperature is kept constant at 40 ℃, and the corresponding electric proportional valve is in a closed state.
7. The solar hot water energy-saving reconstruction system according to claim 1, characterized in that when the temperature of the four hot water tanks of the low-zone hot water tank (13) or the high-zone hot water tank (15) reaches 60 ℃, one domestic hot water circulating pump is turned off, and one domestic hot water circulating pump is turned on, and when the temperature of the four hot water tanks reaches 65 ℃, all the hot water domestic hot water circulating pumps stop operating; when the temperature of any hot water tank is detected to be lower than 55 ℃, one domestic hot water circulating pump is started, and when the temperature of any hot water tank is detected to be lower than 50 ℃, two domestic hot water circulating pumps are started; when all the water pumps stop operating, the boiler is stopped in a linkage manner; when the water pump operates, the boiler is started in a linkage manner.
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