A photovoltaic energy storage air conditioning system

Abstract

The utility model discloses a kind of photovoltaic energy storage air conditioning systems, it includes cold and warm air source heat pump, at least one energy storage water tank, fan-coil unit, photovoltaic power generation system and commercial power supply system, cold and warm air source heat pump and energy storage water tank are respectively with the beam position of building top layer corresponds, cold and warm air source heat pump is connected with energy storage water tank by outer circulation pipeline, outer circulation pipeline is equipped with outer circulation pump, energy storage water tank is connected with fan-coil unit by inner circulation pipeline, inner circulation pipeline is equipped with inner circulation pump, commercial power supply system is connected with the power supply end of cold and warm air source heat pump and fan-coil unit, photovoltaic power generation system is connected with the power supply end of cold and warm air source heat pump.The utility model stores the mode of surplus electricity into the internal energy of water in energy storage water tank, improves the spontaneous use proportion of photovoltaic power generation system, avoids surplus electricity of photovoltaic power generation system into commercial power grid as far as possible, so as to better reduce electricity cost.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning system technology, specifically relating to a photovoltaic energy storage air conditioning system. Background Technology

[0002] Traditional air conditioning systems are typically connected directly to the mains power grid and powered by it. However, to reduce electricity costs, many projects now incorporate photovoltaic (PV) power systems, allowing both the mains power grid and PV power to simultaneously supply power to the air conditioning system.

[0003] However, existing air conditioning systems lack energy storage design, so the surplus electricity generated by the photovoltaic power generation system during peak hours can only be directly fed into the grid, resulting in low electricity price revenue and insufficient optimization of electricity costs. Utility Model Content

[0004] The purpose of this invention is to provide a photovoltaic energy storage air conditioning system.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A photovoltaic energy storage air conditioning system is characterized by comprising a heating and cooling air source heat pump, at least one energy storage tank, a fan coil unit, a photovoltaic power generation system, and a mains power supply system. The heating and cooling air source heat pump and the energy storage tank are both installed on a channel steel foundation on the roof of a building, with their installation positions corresponding to the positions of the building's beams. The fan coil unit is installed indoors. The heating and cooling air source heat pump and the energy storage tank are connected via an external circulation pipe, on which an external circulation pump is installed. The energy storage tank and the fan coil unit are connected via an internal circulation pipe, on which an internal circulation pump is installed. The mains power supply system is connected to the power supply terminals of the heating and cooling air source heat pump and the fan coil unit. The photovoltaic power generation system is connected to the power supply terminal of the heating and cooling air source heat pump. The surplus electricity generated by the photovoltaic power generation system is converted into the internal energy of the water in the energy storage tank by the heating and cooling air source heat pump, thereby storing the surplus electricity.

[0007] A further technical solution of this utility model is as follows: the pipes connected to the outlet and inlet of the energy storage tank are respectively equipped with an outlet water temperature sensor and an inlet water temperature sensor, and the energy storage tank is equipped with an internal temperature sensor for measuring the internal water level.

[0008] A further technical solution of this utility model is: the power output terminal of the inverter of the photovoltaic power generation system is equipped with a photovoltaic power generation monitoring module.

[0009] A further technical solution of this utility model is: the photovoltaic power generation monitoring module includes a meter and a current transformer installed on the wires at the power output end of the inverter.

[0010] A further technical solution of this utility model is as follows: the external circulation pipe includes an external output pipe and an external return pipe. The two ends of the external output pipe are respectively connected to the outlet of the energy storage tank and the inlet of the cold and warm air source heat pump. The two ends of the external return pipe are respectively connected to the inlet of the energy storage tank and the outlet of the cold and warm air source heat pump. The external circulation pump is installed on the external output pipe.

[0011] A further technical solution of this utility model is as follows: the internal circulation pipe includes an internal output pipe and an internal return pipe. The two ends of the internal output pipe are respectively connected to the internal outlet of the energy storage tank and the inlet of the fan coil unit. The two ends of the internal return pipe are respectively connected to the internal inlet of the energy storage tank and the outlet of the fan coil unit. The internal circulation pump is installed on the internal output pipe.

[0012] A further technical solution of this utility model is: a tap water supply valve is provided on the energy storage water tank.

[0013] A further technical solution of this utility model is: a rubber shock-absorbing pad is placed under the air source heat pump for both heating and cooling.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention combines a photovoltaic power generation system, a fan coil unit, and an energy storage tank. During peak power generation periods of the photovoltaic power generation system, surplus electricity generated can drive a cold and warm air source heat pump to cool or heat the water in the energy storage tank. This converts the surplus electricity into the internal energy of the water in the energy storage tank, thereby increasing the self-consumption ratio of the photovoltaic power generation system and minimizing the feeding of surplus electricity into the mains power grid, thus better reducing electricity costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the photovoltaic energy storage air conditioning system according to Embodiment 1 of this utility model;

[0017] Figure 2 This is an installation diagram of the energy storage water tank according to Embodiment 1 of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the photovoltaic energy storage air conditioning system according to Embodiment 2 of this utility model.

[0019] Meaning of the labels in the attached diagram:

[0020] 1-Heating and cooling air source heat pump; 2-Energy storage tank; 3-External circulation pump; 4-External output pipe; 5-External return pipe; 6-Internal output pipe; 7-Internal return pipe; 8-Internal circulation pump; 9-System control box; 10-Inverter; 11-Photovoltaic power generation monitoring module; 12-Fan coil unit; 13-Fan coil unit control panel; 14-Fresh air handling unit; 15-Water supply valve; 16-Cement subbase; 17-Channel steel; 18-Roof surface; 19-Beam. Detailed Implementation

[0021] The present invention will be further described below with reference to embodiments.

[0022] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] Example 1:

[0026] like Figure 1 The photovoltaic energy storage air conditioning system shown in this embodiment includes a cold and warm air source heat pump 1, an energy storage water tank 2, a fan coil unit 12, a photovoltaic power generation system, and a mains power supply system.

[0027] Both the air-source heat pump 1 (heat pump) and the energy storage tank 2 are installed on the steel channel foundation on the roof of the building, such as... Figure 2 As shown, the channel steel foundation includes a cement pad 16 poured on the roof surface 18 and a channel steel 17 anchored on the cement pad 16. A rubber shock-absorbing pad is provided on the channel steel 17. The hot and cold air source heat pump 1 and the energy storage water tank 2 are supported on the rubber shock-absorbing pad and are fixedly connected to the channel steel 17 by bolt assembly.

[0028] Furthermore, the installation positions of the cold and warm air source heat pump 1 and the energy storage water tank 2 correspond to the positions of the horizontal beam 19 on the top floor of the building, thereby reducing the impact of the load on the building and ensuring safety.

[0029] The fan coil unit 12 is installed indoors and is equipped with a corresponding fan coil control panel 13. Indoors, a fresh air unit 14 is used in conjunction with the fan coil unit 12 to achieve indoor air circulation and temperature control.

[0030] The air-source heat pump 1 and the energy storage tank 2 are connected via an external circulation pipe. In this embodiment, the external circulation pipe includes an external output pipe 4 and an external return pipe 5. The two ends of the external output pipe 4 are connected to the outlet of the energy storage tank 2 and the inlet of the air-source heat pump 1, respectively. The two ends of the external return pipe 5 are connected to the inlet of the energy storage tank 2 and the outlet of the air-source heat pump 1, respectively. An external circulation pump 3 and a corresponding switch valve are installed on the external output pipe 4. During use, under the action of the external circulation pump 3, the water in the energy storage tank 2 will first enter the air-source heat pump 1 through the external output pipe 4. The air-source heat pump 1 cools or heats the water flowing through it, and then flows back to the energy storage tank 2 through the external return pipe 5, forming a circulation, thereby realizing the cooling or heating of the water in the energy storage tank 2 (cooling in summer and heating in winter).

[0031] The energy storage tank 2 and the fan coil unit 12 are connected via an internal circulation pipe. In this embodiment, the internal circulation pipe includes an internal output pipe 6 and an internal return pipe 7. The two ends of the internal output pipe 6 are connected to the internal outlet of the energy storage tank 2 and the inlet of the fan coil unit 12, respectively. The two ends of the internal return pipe 7 are connected to the internal inlet of the energy storage tank 2 and the outlet of the fan coil unit 12, respectively. An internal circulation pump 8 and a corresponding switch valve are installed on the internal output pipe 6. During use, under the action of the internal circulation pump 8, the water in the energy storage tank 2 will first enter the fan coil unit of the fan coil unit 12 through the internal output pipe 6. The water flowing through the fan coil unit will absorb heat from the room or release heat into the room, and then flow back to the energy storage tank 2 through the internal return pipe 7, forming a circulation.

[0032] The mains power supply system is connected to the power supply terminals of the air-source heat pump 1 and the fan coil unit 12, providing power to both. The photovoltaic power generation system is also connected to the power supply terminal of the air-source heat pump 1, supplying power to it. During operation, surplus electricity generated by the photovoltaic system drives the air-source heat pump 1 to cool or heat the water in the energy storage tank 2, converting it into the water's internal energy for storage. This photovoltaic system is a grid-connected system.

[0033] The installed capacity of the photovoltaic power generation system in this embodiment is 36kW, and the cooling / heating capacity of the air source heat pump 1 is 15kW.

[0034] In this embodiment, an outlet water temperature sensor T2 and an inlet water temperature sensor T1 are respectively installed on the pipes connected to the outlet and inlet of the energy storage tank 2. The outlet water temperature sensor T2 and the inlet water temperature sensor T1 are used to detect the temperature of the water in the outlet pipe and the inlet pipe, respectively. The energy storage tank 2 is equipped with three internal temperature sensors T3-T5 for measuring the internal water level. The three internal temperature sensors T3-T5 are located at different heights.

[0035] In this embodiment, a photovoltaic power generation monitoring module 11 is provided at the power output terminal of the inverter 10 of the photovoltaic power generation system. The photovoltaic power generation monitoring module 11 includes a meter and a current transformer installed on the wire at the power output terminal of the inverter. The current transformer can detect the current at the power output terminal of the inverter of the photovoltaic power generation system, and the meter measures the power output of the photovoltaic power generation system.

[0036] To achieve better control, the photovoltaic energy storage air conditioning system can be further equipped with a system control box 9 in a further technical solution. The signal output terminals of the outlet water temperature sensor T2, the inlet water temperature sensor T1, the internal temperature sensors T3-T5, the photovoltaic power generation monitoring module 11, the fan coil unit 12, the air source heat pump 1, the internal circulation pump 8, the external circulation pump 3, and the fresh air unit 14 are respectively connected to the system control box 9 by wires.

[0037] The insulated water tank 2 used in this embodiment is a large-capacity tank with a water storage capacity of 2000 kg. The insulated water tank 2 has an 80 mm thick polyurethane insulation layer. A tap water supply valve 15 is installed at the top of the water tank 2, connecting to an external tap water pipe. A drain pipe with a drain valve is installed at the bottom of the water tank 2. Insulation layers are also installed on both the external and internal circulation pipes.

[0038] In the specific implementation process, the photovoltaic energy storage air conditioning system of this embodiment can be based on the photovoltaic power generation P 光伏 The water temperature inside the insulated water tank 2 is further set according to parameters such as time-of-use pricing, in order to reduce the amount of electricity fed into the grid by the photovoltaic system, increase the revenue of the photovoltaic system, and reduce the electricity cost of the air conditioning system. The specific settings are shown in Table 1 below:

[0039] Table 1

[0040]

[0041]

[0042]

[0043] Example 2:

[0044] The difference between the photovoltaic energy storage air conditioning system in Example 2 and Example 1 lies in the energy storage tank 2. In this example, two relatively small energy storage tanks 2 are set up, each with a water capacity of 500 kg, which can reduce the impact on the building.

[0045] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, shall fall within the scope of protection of this utility model.

Claims

1. A photovoltaic energy storage air conditioning system, characterized in that: The system includes a heating and cooling air source heat pump, at least one energy storage tank, a fan coil unit, a photovoltaic power generation system, and a mains power supply system. Both the heating and cooling air source heat pump and the energy storage tank are installed on a steel channel foundation on the building's roof, with their installation positions corresponding to the building's horizontal beams. The fan coil unit is installed indoors. The heating and cooling air source heat pump and the energy storage tank are connected via an external circulation pipe equipped with an external circulation pump. The energy storage tank and the fan coil unit are connected via an internal circulation pipe equipped with an internal circulation pump. The mains power supply system is connected to the power supply terminals of the heating and cooling air source heat pump and the fan coil unit. The photovoltaic power generation system is connected to the power supply terminal of the heating and cooling air source heat pump. Excess electricity generated by the photovoltaic power generation system is converted into internal energy in the water within the energy storage tank by the heating and cooling air source heat pump, thus storing the excess electricity.

2. The photovoltaic energy storage air conditioning system according to claim 1, characterized in that: The water outlet and water inlet of the energy storage tank are respectively equipped with an outlet water temperature sensor and an inlet water temperature sensor. The energy storage tank is equipped with an internal temperature sensor for measuring the internal water level.

3. The photovoltaic energy storage air conditioning system according to claim 1, characterized in that: The inverter of the photovoltaic power generation system is equipped with a photovoltaic power generation monitoring module at its power output terminal.

4. The photovoltaic energy storage air conditioning system according to claim 3, characterized in that: The photovoltaic power generation monitoring module includes a meter and a current transformer installed on the power output wire of the inverter.

5. The photovoltaic energy storage air conditioning system according to claim 1, characterized in that: The external circulation pipe includes an external output pipe and an external return pipe. The two ends of the external output pipe are connected to the outlet of the energy storage tank and the inlet of the cold and warm air source heat pump, respectively. The two ends of the external return pipe are connected to the inlet of the energy storage tank and the outlet of the cold and warm air source heat pump, respectively. The external circulation pump is installed on the external output pipe.

6. The photovoltaic energy storage air conditioning system according to claim 1, characterized in that: The internal circulation pipeline includes an internal output pipe and an internal return pipe. The two ends of the internal output pipe are connected to the internal outlet of the energy storage tank and the inlet of the fan coil unit, respectively. The two ends of the internal return pipe are connected to the internal inlet of the energy storage tank and the outlet of the fan coil unit, respectively. The internal circulation pump is installed on the internal output pipe.

7. The photovoltaic energy storage air conditioning system according to claim 1, characterized in that: The energy storage tank is equipped with a tap water supply valve.

8. The photovoltaic energy storage air conditioning system according to claim 1, characterized in that: The air source heat pump is fitted with a rubber shock-absorbing pad.

Images