CN103836715B - A kind of solar gas compound energy hot-water heating system - Google Patents

Abstract

The present invention relates to the field of water storage heaters, and discloses a solar gas composite energy hot water system, comprising: a solar heater, a gas water heater, a water tank, a central hot water circulation loop and a control system; it is characterized in that the water tank includes : a thermostatic tank directly connected to the central hot water circulation loop, and a heat storage tank forming a solar circulation loop with a solar heater; the first water outlet at the upper end of the thermostatic tank is connected to the water inlet of the gas water heater; The water inlet is connected to the water outlet of the gas water heater to form a heating cycle; the water outlet of the heat storage tank is connected to the second water inlet at the lower end of the thermostatic tank and the water inlet of the gas water heater through a three-way valve. Compared with the prior art, the present invention has the advantages of high utilization rate of solar energy and fast heating rate, and at the same time, it can obtain continuous large-flow constant-temperature water supply capability with relatively small heat output of gas heating equipment. The present invention also provides a control method based on the above hot water system.

Description

A solar gas composite energy hot water system

technical field

The invention relates to the field of water storage heaters, in particular to a solar gas composite energy hot water system and a using method.

Background technique

In recent years, as energy saving and environmental protection put forward higher and higher requirements for household appliances, solar gas water heaters are gradually favored by users. However, independent solar water heaters are greatly affected by the climate, and it is difficult to ensure sufficient hot water at all times. To this end, the industry has developed a multi-heat source hot water system that combines solar gas and gas.

For example, a Chinese patent with publication number CN2740949 discloses a multi-heat source (solar, gas, electricity) central gas water heater, as shown in Figure 1, including: solar heating device 01, gas heating device 02, constant temperature pump 03, temperature sensor 04 , temperature control system 05, the water inlet of the gas heating device 02 is connected with the water storage tank 06, and the water outlet is connected with the water storage tank 06 through a constant temperature pump 03 to form a circulation loop; the water inlet of the solar heating device is connected with the water storage tank 06 The running water communicates, and the outlet is connected with the water storage tank 06; the temperature sensor is located in the water storage tank 06. Although this kind of gas composite energy hot water system with a single water tank and two kinds of heating equipment can combine solar energy and gas combustion heat energy, it mainly has the following two defects: 1) The solar cycle temperature difference is small and the heating efficiency is low; 2) The utilization rate of solar energy is low, and the temperature of the water storage tank is often kept at the set temperature due to the repeated heating of the gas appliance in the water storage tank. At this time, even if the starting conditions of the solar energy are met, the system will force the solar energy not to start. 3) The continuous large flow water supply capacity is low, because the heat heated by solar energy does not directly participate in the heat output. To obtain continuous large flow constant temperature water supply, it must be achieved by increasing the heating capacity of the gas water heater, so the output capacity is affected by the heating capacity of the gas water heater constraints.

In view of this, how to develop and design a new type of solar-gas composite energy hot water system that has a high utilization rate of solar energy and avoids the limitation of water flow by the heating capacity of gas water heaters is a new problem that plagues the development of the industry.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a new type of solar gas combined energy hot water system, which solves the problem of low utilization rate of solar energy in the solar gas combined energy hot water system, and relieves the water flow limitation of the solar gas combined energy hot water system. Gas water heater heating capacity limit problem.

To achieve the above object, the present invention adopts the following technical solutions.

A solar gas composite energy hot water system, comprising: a solar heater, a gas water heater, a water tank, a central hot water circulation loop and a control system; it is characterized in that the water tank includes: a water tank directly connected to the central hot water circulation loop A thermostatic tank, a heat storage tank that forms a solar circulation loop with a solar heater; the connection between the thermostatic tank and the heat storage tank is as follows: the first water outlet on the upper end of the thermostatic tank is connected to the water inlet of the gas water heater, and the second water outlet on the upper end of the thermostatic tank A water inlet is connected to the water outlet of the gas water heater to form a heating cycle; the water outlet of the heat storage tank is connected to the second water inlet at the lower end of the thermostatic tank and the water inlet of the gas water heater through a three-way valve.

As an improvement, a first temperature sensor connected to a control system is provided in the thermostatic tank.

As an improvement, the heat storage tank is provided with a second temperature sensor connected to the control system.

As an improvement, the heating cycle is provided with a first pipeline pump connected to the control system; the first pipeline pump is located on the pipeline connecting the first water outlet of the thermostatic tank and the water inlet of the gas water heater.

As an improvement, the central hot water circulation system is provided with a second pipeline pump connected to the control system.

The present invention also provides a control method based on the above-mentioned solar gas composite energy hot water system, which is characterized in that: the heat storage monitoring closed-loop control method is adopted, that is, the control system calculates the temperature detected by the first sensor and the second sensor The instantaneous heat storage of the composite energy hot water system, when the user reserves the water consumption for a certain period of time through the reservation module, before the arrival of the time period, the control system will automatically determine whether the above instantaneous heat storage meets the user's needs; if not enough, control The system immediately starts the heating cycle through the heating module to supplement the heat of the thermostatic tank.

As an improvement, the control method of the heating cycle is as follows: in the state of water, when the water temperature of the thermostatic tank is ≤ the starting target temperature, and the water flow rate is less than the set flow rate 1, start the first pipeline pump and turn on the gas water heater to heat the thermostatic tank; When the water temperature in the thermostatic tank ≤ the start-up target temperature and the water flow rate > set flow rate 1, the first pipeline pump is turned off, the control system switches the three-way valve, the water in the heat storage tank directly enters the gas water heater through the three-way valve, and the gas water heater is started Heating the thermostatic tank; when the water temperature of the thermostatic tank > the set target temperature, the gas water heater will not start or stop starting.

As a further improvement, the closed-loop control mode of heat storage monitoring includes a control mode of a solar cycle loop, and the control mode of the solar cycle loop is: when the water temperature of the solar heater - the water temperature of the heat storage tank > the set temperature difference, the control system passes The first control module starts the solar circulation loop; when the water temperature of the solar heater - the water temperature of the heat storage tank < the set starting temperature difference or the water temperature of the heat storage tank reaches the set temperature, the solar circulation loop stops running.

As a further improvement, the heat storage monitoring closed-loop control mode includes the control mode of the central hot water circulation loop, and the control mode of the central hot water circulation loop is: when the temperature of the thermostatic tank > the set temperature and the central hot water circulation loop When the water temperature is less than the start-up temperature, the control system starts the second pipeline pump on the central hot water circulation circuit through the second control module; When the pipeline pump runs continuously for more than the set time, the central hot water circulation loop will be closed.

Compared with the existing multi-heat source hot water system, the solar gas composite energy hot water system provided by the present invention has the following beneficial effects:

1. The solar heater and gas water heater are designed separately, and the heat storage tank and the constant temperature tank are used to store heat separately, which can effectively improve the heat exchange temperature difference of solar energy, improve the heat exchange effect and the utilization rate of solar energy.

2. Use solar energy to heat the heat storage tank alone. The size of the heat storage tank is selected according to the guaranteed rate of the designed solar energy. As long as the system has water demand, the solar energy will have heat output, and the solar energy utilization rate is high.

3. Use the control system to intelligently select the direction of heat transfer in the heat storage tank, and the cold water is preheated by the heat storage tank before entering the constant temperature tank or gas water heater, achieving continuous output with a small gas water heater heat output Large flow constant temperature hot water.

4. By setting up the intelligent reservation module, it is convenient for the user to preset the water consumption period and water consumption, so as to ensure the user's water demand within the period.

The control method based on the above-mentioned hot water system provided by the present invention adopts a heat storage monitoring closed-loop control mode, which is convenient for users to reserve water and has good control effect.

Description of drawings

Figure 1 is a schematic diagram of the existing solar gas composite energy hot water system;

Figure 2 is a schematic diagram of the principle of Embodiment 1 of the solar gas composite energy hot water system provided by the present invention;

Fig. 3 shows the heating cycle loop control flow chart of the solar gas composite energy hot water system provided by the present invention;

Fig. 4 shows the solar cycle loop control flow chart of the solar gas composite energy hot water system provided by the present invention;

Fig. 5 shows the control flow chart of the central hot water circulation loop of the solar gas composite energy hot water system provided by the present invention;

Fig. 6 is a schematic structural diagram of Embodiment 2 of the solar-gas composite energy hot water system provided by the present invention.

Explanation of reference signs:

01. Solar heating device 02. Gas heating device 03. Constant temperature pump 04. Temperature sensor 05. Temperature control system 06. Water storage tank

1. Solar heater 2, gas water heater 3, central hot water circulation circuit 4, constant temperature tank 5, heat storage tank 21, water inlet 22, water outlet 41, first water outlet 42, first water inlet 43, second water inlet The water port 44, the first temperature sensor 51, the water outlet 52, the second temperature sensor 7, the first pipeline pump 8, and the second pipeline pump.

Detailed ways

In order to further illustrate the essence of the present invention, the specific embodiments of the present invention are described as follows in conjunction with the accompanying drawings.

Embodiment one

As shown in Figure 2, a solar gas composite energy hot water system includes: a solar heater 1, a gas water heater 2, a central hot water circulation loop 3, a thermostatic tank 4 directly connected to the central hot water circulation loop 3, and a solar The heater 1 forms the heat storage tank 5 of the solar circulation loop, and the control system.

Wherein, the first water outlet 41 of the thermostatic tank 4 is connected to the water inlet 21 of the gas water heater 2, and the first water inlet 42 of the thermostatic tank 4 is connected to the water outlet 22 of the gas water heater 2 to form a heating cycle. The water outlet 51 of the heat storage tank 5 is connected to the second water inlet 43 of the thermostatic tank and the water inlet 21 of the gas water heater through the three-way valve 6 .

The control system includes: a first control module for controlling the solar circulation loop, a heating module for controlling the heating circulation loop, a second control module for controlling the central hot water circulation loop and an intelligent reservation module.

In particular, in order to facilitate the control of the solar gas composite energy hot water system, the thermostatic tank 4 is provided with a first temperature sensor 44 connected to the control system, and the heat storage tank 5 is provided with a first temperature sensor 44 connected to the control system. Two temperature sensors 52, the first pipeline pump 7 connected with the control system is provided on the heating cycle; the first pipeline pump 7 is located on the pipeline connecting the first water inlet 42 of the thermostatic tank 4 and the water outlet 22 of the gas water heater , the central hot water circulation circuit 3 is provided with a second pipeline pump 8 connected to the control system.

In actual control, the solar-gas composite energy hot water system provided in this embodiment adopts the heat storage monitoring closed-loop control method, that is, the control system calculates the instantaneous heat storage of the composite energy hot water system through the temperature detected by the first sensor and the second sensor , when the user reserves the water consumption for a certain period of time through the reservation module, before the time period arrives, the control system will automatically determine whether the user's demand is met according to the above instantaneous heat storage; if not enough, the control system will immediately start the heating cycle through the heating module Supplement the thermostatic tank with heat.

Specifically, as shown in Figure 3, the control method of the heating cycle is: in the state of water, when the water temperature S2 of the thermostatic tank ≤ the start-up target temperature, and the water flow rate F1 < set flow rate one (volume/time), start The first pipeline pump P1 turns on the gas water heater to heat the constant temperature tank; when the water temperature of the constant temperature tank S2≤starting target temperature and the water flow rate F1>set flow rate one (volume/time), the first pipeline pump P1 is turned off, and the control system controls the three The one-way valve is switched, the water in the heat storage tank directly enters the gas water heater through the three-way valve, and the gas water heater is started to heat the constant temperature tank; when the water temperature S2 of the constant temperature tank is greater than the closing target temperature, the gas water heater does not start or stops. And in the state of no water: when the water temperature S2 of the thermostatic tank is ≤ the starting target temperature, the first pipeline pump P1 is started, and the gas water heater is turned on to heat the thermostatic tank.

The closed-loop control mode of heat storage monitoring also includes the control mode of the solar circulation loop, as shown in Figure 4, the solar circulation loop control mode is: when the water temperature of the solar heater S4-the water temperature of the heat storage tank>the set start-up temperature difference , the control system opens the solar circulation loop through the first control module; when the water temperature S4 of the solar heater - the water temperature of the heat storage tank < the set startup temperature difference or the water temperature of the heat storage tank reaches the set temperature, the solar circulation loop stops running . In this embodiment, the set startup temperature difference is 10°C.

The heat storage monitoring closed-loop control method includes the control method of the central hot water circulation circuit. As shown in FIG. 5, the control method of the central hot water circulation circuit is: When the water temperature <starting temperature, the control system turns on the second pipeline pump P2 on the central hot water circulation circuit through the second control module; when the water temperature on the central hot water circulation circuit is ≥ the shutdown target temperature or the water temperature of the thermostatic tank is ≤ a certain temperature or When the second pipeline pump P2 runs continuously for more than the set time, the central hot water circulation loop is closed.

The solar gas composite energy hot water system provided in this embodiment uses solar energy to heat the heat storage tank alone, and the size of the heat storage tank is selected according to the guaranteed rate of the designed solar energy. As long as the system has water demand, the solar energy will generate heat output, ensuring the efficient operation of solar energy. At the same time, due to the constant temperature hot water in the constant temperature tank, when there is a demand for water, the cold water flows in from the lower part of the solar heat storage tank, and the hot water in the solar heat storage tank enters the constant temperature tank through the three-way valve, and the control system detects the water temperature through the sensor. The water flow rate can automatically determine the opening and closing of the first pipeline pump and the three-way valve of the water pump, so as to ensure that the system has a large heat transfer capacity at any time. In addition, since the cold water is preheated by the solar heat storage tank before entering the constant temperature tank or gas water heater, the effect of continuous large flow constant temperature water supply can be achieved with a small heat output of the gas water heater.

Embodiment two

As shown in Figure 6, a solar gas composite energy hot water system includes: a solar heater 1, a gas water heater 2, a central hot water circulation loop 3, a thermostatic tank 4 directly connected to the central hot water circulation loop 3, and a solar The heater 1 forms the heat storage tank 5 of the solar circulation loop, and the control system.

The solar-gas composite energy hot water system provided in this embodiment is basically the same as the first embodiment, the only difference is that the thermostat tank 4 is superimposed on the heat storage tank 5, and the installation structure is compact and occupies a small space.

The above specific embodiments have described the essence of the present invention in detail, but the scope of protection of the present invention cannot be limited thereto. All simple improvements and modifications done according to the essence of the present invention fall within the scope of protection of this patent. In addition, in the present invention, the first, second, and third are only relative definitions for the convenience of description, and are not used to limit the specific positions of the components.

Claims (6)

1. a kind of solar gas compound energy hot-water heating system, including：Solar heater, gas heater, water pot, center heat Water-flow circuit and control system；Characterized in that, the water pot includes：The perseverance being joined directly together with central hot water circulation loop Warm tank, the heat storage can of solar energy circulation loop is formed with solar heater；The connected mode of the thermostatic tank and heat storage can is： The water inlet of the first delivery port connection gas heater of thermostatic tank upper end, the first water inlet connection combustion gas of the thermostatic tank upper end The delivery port of water heater, form heat cycles loop；The delivery port of the heat storage can connects thermostatic tank lower end by triple valve The water inlet of second water inlet and gas heater；

The first temperature sensor being connected with control system is provided with the thermostatic tank, is provided with the heat storage can and control system The second temperature sensor of connection；

Using quantity of heat storage monitoring close-loop control mode during work, i.e. control system is detected by first sensor, second sensor The temperature arrived, the instantaneous quantity of heat storage of energy hot-water heating system is calculated, when user is subscribed in a certain period by preengaging module During water consumption, before the period reaches, control system instantaneous quantity of heat storage more than determines whether to meet user's request automatically；Such as Not enough, control system starts heat cycles loop by heating module to thermostatic tank progress heat supplement immediately.

2. solar gas compound energy hot-water heating system according to claim 1, it is characterised in that the heat cycles are returned Road is provided with the first pipeline pump being connected with control system；First pipeline pump is positioned at the connection delivery port of thermostatic tank first and combustion gas On the pipeline of water feeding of heater mouth.

3. solar gas compound energy hot-water heating system according to claim 1, it is characterised in that the central hot water follows Loop system is provided with the second pipe pump being connected with control system.

4. solar gas compound energy hot-water heating system according to claim 1, its feature are being, the heat cycles The control mode in loop is：With under water state, flow one is set when thermostatic tank water temperature≤startup target temperature, and with water-carrying capacity ＜ When, start the first pipeline pump, open gas heater and thermostatic tank is heated；When thermostatic tank water temperature≤startup target temperature and use water Flow ＞ settings flow for the moment, closes the first pipeline pump, control system switches over to triple valve, and the water in heat storage can is through threeway Valve is directly entered gas heater, starts gas heater and thermostatic tank is heated；When thermostatic tank water temperature ＞ closes target temperature, Gas heater does not start or stop startup.

5. solar gas compound energy hot-water heating system according to claim 1, its feature are being, the quantity of heat storage prison Control close-loop control mode includes the control mode of solar energy circulation loop, and the solar energy circulation loop control mode is：Work as the sun During the temperature difference of the water temperature ＞ settings of water temperature-heat storage can of energy heater, control system passes through the first control module and opens solar energy Circulation loop；When the startup temperature difference of water temperature ＜ settings or the water temperature of heat storage can of water temperature-heat storage can of solar heater reach During the temperature of setting, solar energy circulation loop is out of service.

6. solar gas compound energy hot-water heating system according to claim 1, its feature are being, the quantity of heat storage prison Control close-loop control mode includes the control mode of central hot water circulation loop, and the control mode of the central hot water circulation loop is： When the water temperature ＜ start-up temperatures on thermostatic tank water temperature ＞ design temperatures and central hot water circulation loop, control system passes through second Control module opens the second pipe pump on central hot water circulation loop；When the water temperature in central hot water circulation loop >=closing mesh When mark temperature or thermostatic tank water temperature≤certain temperature or when second pipe pump continuously runs more than setting time, central hot water is closed Circulation loop.