CN-116592525-B - Hot water system capable of maximally utilizing solar energy and control method thereof

Abstract

The invention discloses a hot water system capable of maximally utilizing solar energy and a control method thereof. The system comprises a heat collecting water tank, a constant temperature water tank and a plurality of solar heat collectors, wherein the heat collecting water tank is connected with a cold water source through a first water pipe, the heat collecting water tank is connected with the solar heat collectors through a second water pipe, a first water pump and a first valve component are arranged on the second water pipe, the solar heat collectors are respectively connected with the heat collecting water tank and the constant temperature water tank through a third water pipe and a fourth water pipe, the third water pipe and the fourth water pipe are respectively connected with a second valve component, a fourth water pipe and a fifth water pipe are connected between the heat collecting water tank and the constant temperature water tank, and the constant temperature water tank is connected with a standby heating device through a sixth water pipe. When the solar energy heating device works, the solar energy can be utilized to the maximum extent, the time for putting the standby heating device into use is more reasonable, the temperature adjustment response of the supplied water is ensured to be rapid, the energy consumption of the system is reduced, and the energy saving effect is obvious.

Inventors

• CHEN HAO
• WANG ZHIWEI
• JIANG WENWEN

Assignees

• 南京科之峰节能技术有限公司

Dates

Publication Date

20260508

Application Date

20230628

Claims (6)

1. 1. The control method of the hot water system capable of utilizing solar energy to the maximum extent is characterized in that the hot water system comprises a heat collecting water tank, a constant temperature water tank and a plurality of solar heat collectors, wherein the heat collecting water tank is connected with a cold water source through a first water pipe and is connected with the solar heat collector through a second water pipe, a first water pump and a first valve component are arranged on the second water pipe, the solar heat collector is connected with the heat collecting water tank and the constant temperature water tank through a third water pipe and a fourth water pipe respectively, the third water pipe and the fourth water pipe are connected with a second valve component respectively, a fourth water pipe and a fifth water pipe are connected between the heat collecting water tank and the constant temperature water tank, the fourth water pipe is connected with a water inlet of a standby heating device through a sixth water pipe, a water outlet of the standby heating device is connected with the water tank through a seventh water pipe, the constant temperature water tank is connected with the heat collecting water tank through an eighth water pipe, a temperature sensor is arranged on the first water pump, the first water tank is connected with the second water tank, the second water pump is connected with the first heat collector, the second water heater is connected with the first heat collector, the second heat collector is connected with the first heat collector, the first heat collector is connected with the first heat collector through a second heat sensor, the first heat collector through a third water sensor; The control method comprises the following steps: (1) Low water level water replenishing When the water level of the heat collecting water tank is lower than the lower limit of the water level of the water collecting tank, the solar control cabinet controls the fifth valve component to be opened, and when the water level of the heat collecting water tank reaches the water level of the water collecting tank, the fifth valve component is controlled to be closed; when the water level of the constant-temperature water tank is lower than the lower limit of the set water level, the solar control cabinet controls the fifth valve assembly to be opened, cold water is fed into the heat collecting water tank, then overflows to the constant-temperature water tank through a fifth water pipe between the heat collecting water tank and the constant-temperature water tank, and when the water level of the constant-temperature water tank reaches the upper limit of the water level of the constant-temperature water tank, the solar control cabinet controls the fifth valve assembly to be closed; (2) Control of solar collectors When the water temperature of the solar heat collector and the water temperature of the heat collecting water tank are larger than or equal to a first temperature difference threshold value, the solar control cabinet controls the first water pump to start, and the second valve component on the third water pipe is opened, and during the period, if the water level of the heat collecting water tank is lower than a set water level lower limit, or the temperature of the heat collecting water tank reaches a set water temperature upper limit, or the water temperature of the solar heat collector and the water temperature of the heat collecting water tank are smaller than or equal to a second temperature difference threshold value, the solar control cabinet controls the first water pump to stop, and the second valve component on the third water pipe is closed; (3) Circulation control between heat collecting water tank and constant temperature water tank When the water temperature of the constant-temperature water tank is less than or equal to the set water temperature lower limit of the constant-temperature water tank and the water temperature of the heat collection water tank is more than or equal to the third temperature difference threshold, the solar control cabinet controls the second water pump to start, and during the period, if the water temperature of the constant-temperature water tank is more than or equal to the set water temperature upper limit of the constant-temperature water tank, the solar control cabinet controls the second water pump to stop; (4) Control of standby heating device At 8 a.m. to 16 a.m., if the water temperature of the constant-temperature water tank is more than or equal to the set first starting temperature, the solar control cabinet controls the standby heating device to stop; If the water temperature of the constant-temperature water tank is smaller than the set first starting temperature, judging whether the water temperature of the solar heat collector is larger than the set direct supply temperature, if the water temperature of the solar heat collector is larger than the set direct supply temperature, the solar control cabinet firstly controls the first water pump to start, the second valve component on the fourth water pipe is started, so that hot water of the solar heat collector directly flows into the constant-temperature water tank, when the water temperature in the constant-temperature water tank is still smaller than the set first starting temperature within the set time, the solar control cabinet controls the standby heating device to start, the standby heating device controls the third water pump to start, and when the water temperature in the constant-temperature water tank is larger than or equal to the set first starting temperature, the standby heating device controls the third water pump to stop, and the solar control cabinet controls the standby heating device; If the water temperature of the constant-temperature water tank is less than the set second starting temperature, the solar control cabinet controls the standby heating device to operate, the standby heating device controls the third water pump to start, and when the water temperature of the constant-temperature water tank is more than or equal to the set second starting temperature, the solar control cabinet controls the standby heating device to stop, and the standby heating device controls the third water pump to stop; And if the water temperature of the heat collection water tank is less than the set second starting temperature, the solar control cabinet controls the standby heating device and the second water pump to start, the standby heating device controls the third water pump to run, and when the water temperature of the heat collection water tank is more than or equal to the set second starting temperature, the solar control cabinet controls the standby heating device and the second water pump to stop, and the standby heating device controls the third water pump to stop.
2. 2. The control method of a water heating system for maximizing solar energy utilization as defined in claim 1 wherein a first liquid level sensor is further provided on said heat collecting water tank and a second liquid level sensor is provided on said constant temperature water tank.
3. 3. A control method of a water heating system for maximizing solar energy utilization as defined in claim 1 wherein a fourth temperature sensor is provided on said second water pipe.
4. 4. A control method of a hot water system for maximizing solar energy utilization as defined in claim 1 wherein said backup heating device is a heat pump type backup heating device.
5. 5. The control method of a water heating system for maximizing solar energy utilization as defined in claim 1 wherein said cold water source is tap water, a fifth valve assembly is provided on said first water pipe, said fifth valve assembly being connected to a solar control cabinet.
6. 6. The method of claim 1, wherein a fourth water pump and a sixth valve assembly are provided on the eighth water pipe, and the fourth water pump is connected to the solar control cabinet.

Description

Hot water system capable of maximally utilizing solar energy and control method thereof Technical Field The invention relates to the technical field of solar water heating systems, in particular to a water heating system capable of maximally utilizing solar energy and a control method thereof. Background The traditional solar heat collecting device is characterized in that water is stored in a water tank at the top of the solar heat collecting device, the water in the water tank is heated by solar energy in daytime, the solar heat collecting device is generally used for bathing at night, and after the water in the water tank is used, a tap water inlet valve is opened or a water supplementing pump is started to run so as to supplement water to the water tank. In recent years, in order to save cost, some enterprises start to put into use solar water heating systems in areas with high hot water demands, such as staff dormitories. The control system is a core component of the solar concentrated hot water project, and directly influences the stability of the solar hot water project in the later operation and the energy-saving effect of the solar hot water project. With the popularization of solar water heating engineering on roofs of domestic public buildings, a large number of extensive and low-end control systems are spread, so that a plurality of solar water heating engineering do not achieve the expected energy-saving effect. Specifically, solar hot water engineering is affected by overcast and rainy weather, so that auxiliary heat sources are required to be configured in project design, construction and operation stages, and the whole equipment is controlled and managed through a control system. However, most solar control systems control the heating mode widely at present, and the maximum utilization of the solar system cannot be realized. Specifically, the solar control system does not reasonably control the auxiliary heating equipment, and solar energy is not utilized preferentially, so that solar energy cannot be utilized maximally. Specifically, when the temperature of the water tank is lower than the set temperature, the auxiliary heat source is started immediately, so that the water temperature of the water tank is always set at the set temperature, and the solar energy utilization condition is not considered, so that the energy waste is caused. Disclosure of Invention The invention aims at overcoming the defects of the prior art and provides a hot water system capable of maximally utilizing solar energy and a control method thereof. In order to achieve the above object, in a first aspect, the present invention provides a hot water system for maximizing solar energy utilization, which comprises a heat collecting water tank, a constant temperature water tank and a plurality of solar heat collectors, wherein the heat collecting water tank is connected with a cold water source through a first water pipe and is connected with the solar heat collector through a second water pipe, a first water pump and a first valve component are arranged on the second water pipe, the solar heat collector is connected with the heat collecting water tank and the constant temperature water tank through a third water pipe and a fourth water pipe respectively, the third water pipe and the fourth water pipe are connected with a second valve component respectively, a fourth water pipe and a fifth water pipe are connected between the heat collecting water tank and the constant temperature water tank, the fourth water pipe is connected with a water inlet of a standby heating device through a sixth water pipe, a water outlet of the standby heating device is connected with the constant temperature water tank through a seventh water pipe, the constant temperature water tank is connected with a temperature sensor through a third water pipe and a fourth water pipe, the temperature sensor is connected with the first water pump, the second temperature sensor is connected with the first heat collector, the second sensor is connected with the first heat collector, and the first heat collector is connected with the first heat collector, and the second sensor is connected with the first heat collector. Further, a first liquid level sensor is further arranged on the heat collection water tank, and a second liquid level sensor is arranged on the constant temperature water tank. Further, a fourth temperature sensor is arranged on the second water pipe. Further, the standby heating device is a heat pump type standby heating device. Further, the cold water source is tap water, a fifth valve component is arranged on the first pipeline, and the fifth valve component is connected with the solar control cabinet. Further, a fourth water pump and a sixth valve component are arranged on the eighth water pipe, and the fourth water pump is connected with the solar control cabinet. In a second aspect, the present invention provides a control method of the