An air source heat pump water supply system

Abstract

This utility model relates to the field of air source heat pump technology, specifically providing an air source heat pump water supply system, including: a constant temperature water tank, a preheating water tank, and an air source heat pump unit; the preheating water tank is used to replenish water to the constant temperature water tank when the water level in the constant temperature water tank is lower than a first set water level and the water temperature inside the preheating water tank reaches a first set temperature; the air source heat pump unit is used to heat the water inside the preheating water tank to the first set temperature and to heat the water inside the constant temperature water tank to a second set temperature; wherein, the second set temperature is determined based on the water supply temperature; the first set temperature is determined based on the second set temperature and the power of the first air source heat pump unit, resulting in the first air source heat pump unit reaching a preset energy efficiency ratio. This utility model provides an air source heat pump water supply system that improves the energy efficiency ratio of the air source heat pump water supply system by changing the water replenishment mode and heating mode of the constant temperature water tank.

Description

Technical Field

[0001] This utility model relates to the field of air source heat pump technology, and in particular to an air source heat pump water supply system. Background Technology

[0002] An air source heat pump is an energy-saving device that uses high-grade energy to move heat from a low-grade heat source (air) to a high-grade heat source. It is a type of heat pump that can convert low-grade heat energy (such as the heat contained in air, soil, and water) that cannot be directly used into usable high-grade heat energy, thereby achieving the goal of saving some high-grade energy (such as coal, natural gas, oil, and electricity).

[0003] Existing air-source heat pump water supply systems typically circulate directly with a constant-temperature water tank, using a heating mode that replenishes water as it is used, always maintaining the tank at its maximum volume. Furthermore, these systems generally employ temperature difference heating, operating between 50℃ and 55℃ in winter (with an upper limit of 55℃). When the temperature drops below the lower limit of 50℃, the air-source heat pump starts heating until it reaches the upper limit and then stops. In spring, summer, and autumn, the operating temperature is between 45℃ and 50℃.

[0004] Air source heat pumps transfer heat from the air to water by consuming electrical energy. Based on the reverse Carnot cycle principle, when the water temperature is low, the temperature difference between the water and air is small, resulting in a high motive force for heat transfer. Therefore, the heat pump unit consumes relatively little electricity to transfer heat from the air to the water, leading to a relatively high energy efficiency ratio. However, as the initial water temperature rises, the temperature difference between the water and air increases, making heat transfer more difficult. This requires more electrical energy to drive components such as the compressor to complete the heat transfer, resulting in a decrease in the energy efficiency ratio.

[0005] There is currently no effective solution to the problem of low energy efficiency in air source heat pump water supply systems in related technologies. Utility Model Content

[0006] The present invention provides an air source heat pump water supply system and its control method, which at least solves the problem of low energy efficiency of air source heat pump water supply systems.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] This utility model provides an air source heat pump water supply system, including: a constant temperature water tank, a pre-temperature water tank, and an air source heat pump unit; the outlet of the pre-temperature water tank is connected to the first inlet of the constant temperature water tank, and is used to replenish water to the constant temperature water tank when the water level in the constant temperature water tank is lower than a first set water level and the water temperature inside the pre-temperature water tank reaches a first set temperature; the air source heat pump unit is connected to the pre-temperature water tank and the constant temperature water tank, and is used to heat the water temperature inside the pre-temperature water tank to the first set temperature and heat the water temperature inside the constant temperature water tank to a second set temperature; wherein, the second set temperature is determined based on the water supply temperature; the first set temperature is determined based on the second set temperature and the power of the first air source heat pump unit, so that the energy efficiency ratio of the first air source heat pump unit reaches a preset value.

[0009] Preferably, the system further includes: a water replenishment system connected to the first inlet of the initial temperature water tank, used to replenish water to the initial temperature water tank when the water level inside the initial temperature water tank is lower than a second set water level during a first set time period; wherein the start time of the first set time period is later than 6:00 a.m. daily, and the end time of the first set time period is earlier than 19:00 a.m. daily; and the second set water level is greater than or equal to 1 / 2 of the internal volume of the initial temperature water tank.

[0010] Preferably, the water replenishment system is also connected to the second inlet of the constant temperature water tank, and is used to replenish water to the constant temperature water tank when the water level inside the constant temperature water tank is lower than the third set water level; wherein, the first set water level is greater than 1 / 3 of the volume of the initial temperature water tank; and the third set water level is less than or equal to 1 / 3 of the volume of the constant temperature water tank.

[0011] Preferably, the water replenishment system includes: a first pipe, one end connected to a tap water pipe and the other end connected to a first inlet of the initial temperature water tank, the first pipe being equipped with a first inlet solenoid valve; a second pipe, one end connected to a tap water pipe and the other end connected to a second inlet at the top of the constant temperature water tank, the third pipe being equipped with a second inlet solenoid valve; wherein, the first inlet solenoid valve operates for a first set time period and opens when the water level inside the initial temperature water tank is lower than the first set water level; the second inlet solenoid valve operates for a second set time period and opens when the water level inside the constant temperature water tank is lower than the third set water level.

[0012] Preferably, the outlet of the initial temperature water tank is connected to the first inlet of the constant temperature water tank via a water supply pipe; the water supply pipe is equipped with a water supply valve; wherein the working time of the water supply valve is a second set time period; the second set time period is within the range of the first set time period, and the start time of the second set time period is m hours later than the start time of the first set time period, where m is a natural number, and m is greater than the time required for the initial temperature water tank to replenish water from an empty water level to the second set water level and heat the water to the first set temperature.

[0013] Preferably, the first set time is 8:00-18:00 daily, and the second set time is 10:00-18:00 daily.

[0014] Preferably, the volume of the initial temperature water tank is smaller than that of the constant temperature water tank; the sum of the volumes of the initial temperature water tank and the constant temperature water tank is greater than the designed water consumption.

[0015] Preferably, the air source heat pump unit includes: a first air source heat pump unit connected to the initial temperature water tank for heating the water inside the initial temperature water tank to a first set temperature; wherein the first set temperature is 27℃-32℃; a second air source heat pump unit connected to the constant temperature water tank for heating the water inside the constant temperature water tank to a second set temperature; wherein the first set temperature is 45℃-55℃; and the power of the first air source heat pump unit is 10 kW - 20 kW.

[0016] Preferably, the second air source heat pump unit includes multiple air source heat pumps; the multiple air source heat pumps are connected in parallel to simultaneously heat the constant temperature water tank.

[0017] Preferably, the system further includes an electric auxiliary heating system; the electric auxiliary heating system is installed inside the constant temperature water tank and is used as a backup heating device to assist the first air source heat pump unit in heating the water inside the constant temperature water tank.

[0018] The system further includes: a return water pipe, one end of which is connected to the third inlet of the constant temperature water tank, and the other end of which is connected to the room's main return water pipe; a temperature controller is installed at the end of the return water pipe; the return water pipe is used to input water from inside the constant temperature water tank into the room's main return water pipe when the temperature controller detects that the water temperature at the end of the return water pipe is lower than the lower limit of the third set temperature, until the water temperature at the end of the return water pipe reaches the upper limit of the third set temperature; the third set temperature is lower than the second set temperature.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention provides an air-source heat pump water supply system. By adding an initial temperature water tank and heating the water inside to a first preset temperature before replenishing the constant temperature water tank, the initial temperature of the water added to the constant temperature water tank is the first preset temperature, not the ambient temperature. This allows the first air-source heat pump unit to only need to heat the water from the first preset temperature to a second preset temperature, resulting in lower power consumption. Furthermore, if the first preset temperature is too high, the temperature difference with the ambient temperature increases, thus increasing the load on the first air-source heat pump unit; conversely, if the first preset temperature is too low, the temperature difference with the second preset temperature increases, affecting the energy consumption of the first air-source heat pump unit. Therefore, the first preset temperature of this invention is determined based on the second preset temperature and the power of the second air-source heat pump unit, ensuring that the energy efficiency ratio of the second air-source heat pump unit reaches a preset value, thereby significantly improving the energy efficiency ratio of the air-source heat pump water supply system. Furthermore, the constant temperature water tank of this invention is replenished when the water level is below the first set level. Compared with the on-demand water replenishment mode in related technologies, this invention can reduce the load and operating cost of the air heat source pump unit. Attached Figure Description

[0021] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without any creative effort.

[0022] Figure 1 This is a structural block diagram of an air source heat pump water supply system according to an embodiment of this utility model.

[0023] Figure 2 This is a schematic diagram of the structure of an air source heat pump water supply system according to one embodiment of this utility model.

[0024] Figure reference numerals:

[0025] 1. Initial temperature water tank; 2. First air source heat pump unit; 2-1. First heat circulation pump; 3. Return water pipe; 3-1. Return water solenoid valve; 4. Second air source heat pump unit; 5. Second heat circulation pump; 6. Electric auxiliary heating system; 7. Constant temperature water tank; 8. Emergency water supply valve; 9. Cold water tank; 10. Variable frequency water pump; 11. Cold water pipe; 12. Liquid level sensor. Detailed Implementation

[0026] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0027] The air source heat pump water supply system in related technologies adopts a water replenishment mode that replenishes water while in use, so that the constant temperature water tank always maintains the maximum volume ratio and the full load operation state, which avoids unnecessary increase in the operating cost of the air source heat pump and thus reduces the energy consumption ratio of the air source heat pump water supply system.

[0028] Furthermore, air-source heat pump units in related technologies operate in an all-weather mode, inevitably working during low-temperature periods such as early morning and late evening. However, as the air-source heat pump unit continuously heats the internal water, the water temperature rises, increasing the temperature difference between the water and the low-temperature environment. This increases the difficulty of heat transfer, requiring more electrical energy to drive components such as the compressor to move heat, thus reducing the energy efficiency ratio (EER) of the air-source heat pump water supply system. At an ambient temperature of 0°C, the EER may be 2.0-3.0, while at -10°C, it may drop to 1.5-2.0.

[0029] like Figure 1 As shown, in order to improve the energy efficiency ratio of the air source heat pump water supply system, the first embodiment of this utility model provides an air source heat pump water supply system, including: a constant temperature water tank 7, a primary temperature water tank 1 and an air source heat pump unit.

[0030] The outlet of the initial temperature water tank 1 is connected to the first inlet of the constant temperature water tank 7, and is used to replenish the constant temperature water tank 7 when the water level of the constant temperature water tank 7 is lower than the first set water level and the water temperature inside the initial temperature water tank 1 reaches the first set temperature.

[0031] The air source heat pump unit is connected to the initial temperature water tank 1 and the constant temperature water tank 7 to heat the water temperature inside the initial temperature water tank 1 to the first set temperature and to heat the water temperature inside the constant temperature water tank 7 to the second set temperature.

[0032] The second set temperature is determined based on the water supply temperature; the first set temperature is determined based on the second set temperature and the power of the first air source heat pump unit 2, so that the energy efficiency ratio of the first air source heat pump unit 2 reaches the preset value.

[0033] This invention provides an air-source heat pump water supply system. By adding an initial temperature water tank 1 and heating the water inside the initial temperature water tank 1 to a first preset temperature before replenishing the constant temperature water tank 7, the initial temperature of the water added to the constant temperature water tank 7 is the first preset temperature, not the ambient temperature. This allows the first air-source heat pump unit 2 to only need to heat the water from the first preset temperature to a second preset temperature, resulting in lower power consumption. Furthermore, if the first preset temperature is too high, the temperature difference with the ambient temperature increases, thus increasing the load on the first air-source heat pump unit 2; conversely, if the first preset temperature is too low, the temperature difference with the second preset temperature increases, affecting the energy consumption of the first air-source heat pump unit 2. Therefore, the first preset temperature of this invention is determined based on the second set temperature and the power of the second air-source heat pump unit 4, ensuring that the energy efficiency ratio of the second air-source heat pump unit 4 reaches a preset value, thereby significantly improving the energy efficiency ratio of the air-source heat pump water supply system. Furthermore, the constant temperature water tank 7 of this invention is replenished when the water level is below the first set level. Compared with the on-demand water replenishment mode in related technologies, this invention can reduce the load and operating cost of the air heat source pump unit.

[0034] Specifically, such as Figure 2 As shown, the system of this utility model embodiment includes: a cold water tank 9, a cold water pipe, a hot water pipe, and a variable frequency water pump 10.

[0035] The cold water tank 9 is used to store cold water. The inlet of the cold water tank 9 is connected to the tap water pipe, and the outlet of the cold water tank 9 is connected to the cold water pipe. The hot water pipe is connected to the outlet at the bottom of the constant temperature water tank 7. The variable frequency water pump 10 is connected to both the cold water and hot water pipes and is used to supply cold or hot water to the point of use.

[0036] Furthermore, the air source heat pump unit of this utility model embodiment includes:

[0037] The first air source heat pump unit 2 is connected to the initial temperature water tank 1 and is used to heat the water inside the initial temperature water tank 1 to a first set temperature; wherein, the first set temperature is 27℃-32℃.

[0038] The second air source heat pump unit 4 is connected to the constant temperature water tank 7 and is used to heat the water inside the constant temperature water tank 7 to a second set temperature; wherein, the second set temperature is 45℃-55℃; the power of the second air source heat pump unit 4 is 10 kW-20 kW.

[0039] Specifically, the first air source heat pump unit 2 draws water from the initial temperature water tank 1 into the first air source heat pump unit 2 through the first heat circulation pump 2-1 to heat the water. When the water temperature at the outlet of the first air source heat pump unit 2 reaches the first set temperature, the water is sent back to the initial temperature water tank 1 to achieve heating of the water inside the initial temperature water tank 1.

[0040] The second air source heat pump unit 4 draws water from the constant temperature water tank 7 into the second air source heat pump unit 4 through the second heat circulation pump 5 to heat the water. When the water temperature at the outlet of the second air source heat pump unit 4 reaches the second set temperature, the water is sent back to the initial temperature water tank 1 to achieve heating of the water inside the constant temperature water tank 7.

[0041] Furthermore, the second air source heat pump unit 4 includes multiple air source heat pumps; the multiple air source heat pumps are connected in parallel to simultaneously heat the constant temperature water tank 7.

[0042] It is worth noting that the air source heat pump water supply system in the relevant technology directly heats the low-temperature water from the tap water pipe to the first set temperature. The water temperature in the tap water pipe is directly proportional to the ambient temperature, and the ambient temperature is related to the energy efficiency ratio of the first air source heat pump unit 2, the working status of the compressor, the frosting situation, and the stability of operation.

[0043] If the ambient temperature is low, the internal water temperature of the air source heat pump will continuously rise as it operates, increasing the temperature difference between the ambient and water temperatures. This forces the air source heat pump to consume more electrical energy to raise the water temperature, resulting in a lower energy efficiency ratio (EER). At an ambient temperature of 0°C, the EER may be 2.0-3.0, while at -10°C, it may drop to 1.5-2.0. Simultaneously, the heating capacity of the air source heat pump may decrease by 30%-50% compared to normal temperatures. The increased temperature difference between the evaporator surface and the ambient temperature accelerates frosting, which hinders heat exchange between the air and the evaporator, reducing the heating efficiency of the air source heat pump unit and further lowering the EER. In severe cases, this can lead to the unit shutting down. Furthermore, low temperatures increase the viscosity of the compressor lubricating oil, increasing component wear and affecting the operational stability of the air source heat pump unit.

[0044] If the ambient temperature is high, the compressor needs higher discharge pressure and a larger compression ratio to transfer heat to the water, which increases the compressor's work, increases power consumption, increases the equipment's operating load, reduces the equipment's lifespan, and may also trigger overheat protection, causing the equipment to shut down intermittently, affecting heating efficiency and stability, and reducing the energy efficiency ratio.

[0045] Therefore, in order to avoid the disadvantages caused by the first air source heat pump unit 2 operating at a low ambient temperature, this invention provides an initial temperature water tank 1 to preheat the low-temperature water from the tap water pipe to the initial temperature.

[0046] The heating and water replenishment method for the air source heat pump water supply system provided in this embodiment is mainly used in the field of hotel water supply. Since the hot water temperature required for hotel water supply is between 45℃ and 48℃ in summer and between 50℃ and 54℃ in winter, this utility model sets the range of the second preset temperature to between 45℃ and 50℃.

[0047] Furthermore, in order to meet the power requirements for water heating, the total power range of the first air source heat pump unit 2 selected in this utility model is 10kw-20kw.

[0048] This invention fully considers the relationship between the second preset temperature, the power of the second air source heat pump unit 4, the ambient temperature, and the energy efficiency ratio. The first preset temperature is set to 27℃-32℃, so that the water added to the constant temperature water tank 7 has a certain initial temperature, reducing the impact on the energy efficiency ratio of the first air source heat pump unit 2 as the water temperature inside the constant temperature water tank 7 increases and the ambient temperature difference increases. As a result, the energy efficiency ratio of the first air source heat pump unit 2 can reach the preset value requirement, which is preferably 3. The energy efficiency ratio of the first air source heat pump unit 2 of this invention can be as high as 3-3.5.

[0049] Furthermore, the volume of the initial temperature water tank 1 is smaller than that of the constant temperature water tank 7; the sum of the volumes of the initial temperature water tank 1 and the constant temperature water tank 7 is greater than the designed water consumption.

[0050] Preferably, the volume of the initial temperature water tank 1 is half of the designed water consumption.

[0051] Taking a design water consumption of 10 tons as an example, the initial temperature water tank 1 has a volume of 5 tons, and the constant temperature water tank 7 has a volume of 12 tons.

[0052] Furthermore, the system in this embodiment of the present invention also includes a water replenishment system.

[0053] The water replenishment system is connected to the first inlet of the initial temperature water tank 1 and is used to replenish water to the initial temperature water tank 1 when the water level inside the initial temperature water tank 1 is lower than the second set water level during a first set time period.

[0054] The first set time period starts later than 6:00 a.m. each day, and ends earlier than 7:00 p.m. each day; the second set water level is greater than or equal to half the internal volume of the initial temperature water tank 1.

[0055] Since low temperatures reduce the energy efficiency ratio of air source heat pump units, this invention sets the start time of operation of the first air source heat pump unit 2 to be later than 6:00 a.m. and the end time to be later than 7:00 p.m. The specific time period can be adjusted according to the sunrise and sunset times of the current season. The overall requirement is to ensure that the first air source heat pump unit 2 is started during the daytime when the temperature is high.

[0056] Furthermore, the first set time period is preferably 8:00-18:00 daily.

[0057] In addition, the water replenishment system is connected to the second inlet of the constant temperature water tank 7, and an emergency water replenishment valve 8 is installed on the connecting pipe between the water replenishment system and the constant temperature water tank 7. When the water level inside the constant temperature water tank 7 is lower than the third set water level, the emergency water replenishment valve 8 is opened to replenish water to the constant temperature water tank 7; wherein, the first set water level is greater than 1 / 3 of the volume of the initial temperature water tank 1; and the third set water level is less than or equal to 1 / 3 of the volume of the constant temperature water tank 7.

[0058] When the water level inside the constant temperature water tank 7 is between the first set water level and the third set water level, the constant temperature water tank 7 is replenished with water daily through the initial temperature water tank 1 during the second set time period. However, when the water level inside the constant temperature water tank 7 is lower than the third water level, an emergency may have occurred, and the water replenishment system will be used to replenish the constant temperature water tank 7 in an emergency.

[0059] Preferably, the water replenishment system includes:

[0060] The first pipe is connected to the tap water pipe at one end and to the first inlet of the initial temperature water tank 1 at the other end. The first pipe is equipped with a first water inlet solenoid valve.

[0061] The second pipe is connected to the tap water pipe at one end and to the second inlet at the top of the constant temperature water tank 7 at the other end. The third pipe is equipped with a second water inlet solenoid valve.

[0062] The first inlet solenoid valve operates for a first set time period and opens when the water level inside the initial temperature water tank 1 is lower than the first set water level; the second inlet solenoid valve operates for a second set time period and opens when the water level inside the constant temperature water tank 7 is lower than the third set water level.

[0063] This embodiment of the invention, by setting the operating times of the first and second inlet solenoid valves and controlling the opening and closing of the first and second inlet solenoid valves through the linkage of the control system with the liquid level sensor 12, ensures that the initial temperature water tank 1 is replenished with water during the first set time period and when the water level is lower than the first set water level. It also ensures that the constant temperature water tank 7 is replenished with water urgently during the second set time period and when the water level is lower than the third set water level.

[0064] Furthermore, the liquid level sensor 12 is installed at different liquid level heights inside the initial temperature water tank 1 and the constant temperature water tank 7, preferably at the empty water level, 1 / 3 water level, 1 / 2 water level, 2 / 3 water level and full water level.

[0065] Preferably, the outlet of the initial temperature water tank 1 is connected to the first inlet of the constant temperature water tank 7 via a water supply pipe; the water supply pipe is equipped with a water supply valve.

[0066] The working time of the water replenishment valve is the second set time period; the second set time period is within the range of the first set time period, and the start time of the second set time period is m hours later than the start time of the first set time period, where m is a natural number and m is greater than the time required for the initial temperature water tank 1 to replenish water from the empty water level to the second set water level and heat the water temperature to the first set temperature.

[0067] In this embodiment of the invention, m is preferably 2 hours, the first set time is 8:00-18:00 every day, and the second set time is 10:00-18:00 every day.

[0068] This invention ensures that the initial temperature water tank 1 will replenish water to the constant temperature water tank 7 only when the water temperature reaches the first set temperature during the second set time period by setting the working time of the water replenishment valve and linking it with the control system and temperature sensor.

[0069] Temperature sensors are located at the outlet of the first air source heat pump unit 2, the outlet of the second air source heat pump unit 4, inside the initial temperature water tank 1, and inside the constant temperature water tank 7.

[0070] Furthermore, the system in this embodiment of the present invention also includes: an electric auxiliary heating system 6;

[0071] The electric auxiliary heating system 6 is installed inside the constant temperature water tank 7 and is used as a backup heating device to assist the first air source heat pump unit 2 in heating the water inside the constant temperature water tank 7.

[0072] Specifically, the electric auxiliary heating system 6 is controlled by the water temperature and time in the insulated water tank. All electric heating is done through external pipes. If the water temperature in the insulated water tank is lower than the set temperature (e.g., T≤45℃), the electric auxiliary heating device automatically starts to heat the water in the tank until the temperature probe reaches the set temperature (e.g., T≥50℃), at which point it stops working. If necessary, operators can adjust the water temperature and control parameters according to actual needs to save on operating costs.

[0073] Furthermore, the system in this embodiment of the present invention also includes: a return water pipe 3 and a pressurized water supply system.

[0074] One end of the return water pipe 3 is connected to the third inlet of the constant temperature water tank 7, and the other end is connected to the main return water pipe of the room; a temperature controller is installed at the end of the return water pipe 3; and a return water solenoid valve 3-1 is installed on the return water pipe 3.

[0075] The return water pipe 3 is used to open the return water solenoid valve 3-1 when the temperature controller detects that the water temperature at the end of the return water pipe 3 is lower than the lower limit of the third set temperature, so that the water inside the constant temperature water tank 7 is input into the room return water main pipe until the water temperature at the end of the return water pipe 3 reaches the upper limit of the third set temperature; the third set temperature is lower than the second set temperature.

[0076] When the temperature is lower than the third set temperature, the water inside the constant temperature water tank 7 is pumped to the return water pipe 3 through the pressurized water supply system until the temperature reaches the third set temperature, at which point the pressurized water supply system is turned off; wherein, the third set temperature is lower than the second set temperature. Preferably, the third set temperature is 5 degrees lower than the second set temperature.

[0077] This embodiment of the invention, by setting up a return water pipe 3 and a pressurized water supply system, ensures that the end of the return water pipe 3 reaches the third set temperature, thereby guaranteeing that hot water is supplied as soon as the hot water switch in each room is turned on, reducing the waste of low-temperature water and energy consumption. The pressurized water supply system is equipped with a pressurized pump, which can pressurize the water supply and return water, thereby ensuring the normal water supply to the constant temperature water tank 7.

[0078] Taking a hotel as the water supply target, assuming the hotel has 90-100 rooms, the constant temperature water tank 7 has a capacity of 10-12 tons. Based on national standards for hot water at 45℃-55℃, the average person's shower water consumption is approximately 75kg-100kg. The designed average water consumption per person is 100-200kg / person, and it is assumed that hotel rooms are generally designed as double rooms. The first air source heat pump unit 2 includes two 10HP or three 5HP air source heat pumps to ensure that the total power of the first air source heat pump unit 2 matches the maximum demand power. The second air source heat pump unit 4 is a 5HP air source heat pump.

[0079] The air source heat pump water supply system provided in this invention can also be used in the application of gas boilers or solar energy supporting systems.

[0080] When applied to gas-fired boilers, they are directly matched for atmospheric pressure boilers, while pressure boilers require the addition of a water tank and plate heat exchanger.

[0081] When applied to a solar energy system, an air source heat pump of appropriate power is added to the solar water tank, and the operating temperature range of the air source heat pump is set.

[0082] It should be noted that the term "comprising" and its variations used in the embodiments of this utility model are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; and the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of this utility model are illustrative and not restrictive. Those skilled in the art should understand that, unless explicitly indicated otherwise in the context, they should be understood as "one or more".

[0083] The steps described in the method embodiments provided by this invention can be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of protection of this invention is not limited in this respect.

[0084] The term "embodiment" in this specification refers to a specific feature, structure, or characteristic described in connection with an embodiment that may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily imply the same embodiment, nor does it imply independence or alternativeity from other embodiments. The various embodiments in this specification are described in a related manner, with reference to each other for similar or identical parts. In particular, for apparatus, device, and system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, and relevant details are referred to in the description of the method embodiments.

[0085] The above-described embodiments are merely illustrative of several implementations of this invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of protection. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this invention, and these modifications and improvements all fall within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the appended claims.

Claims

1. An air-source heat pump water supply system, characterized in that, include: Constant temperature water tank, initial temperature water tank and air source heat pump unit; The outlet of the initial temperature water tank is connected to the first inlet of the constant temperature water tank, and is used to replenish the constant temperature water tank when the water level in the constant temperature water tank is lower than the first set water level and the water temperature inside the initial temperature water tank reaches the first set temperature. The air source heat pump unit is connected to the initial temperature water tank and the constant temperature water tank, and is used to heat the water temperature inside the initial temperature water tank to a first set temperature and the water temperature inside the constant temperature water tank to a second set temperature. The second set temperature is determined based on the water supply temperature; the first set temperature is determined based on the second set temperature and the power of the first air source heat pump unit, so that the energy efficiency ratio of the first air source heat pump unit reaches the preset value.

2. The air source heat pump water supply system according to claim 1, characterized in that, The system also includes: A water replenishment system is connected to the first inlet of the initial temperature water tank and is used to replenish water to the initial temperature water tank when the water level inside the initial temperature water tank is lower than the second set water level during a first set time period. Wherein, the start time of the first set time period is later than 6:00 a.m. each day, and the end time of the first set time period is earlier than 19:00 a.m. each day; the second set water level is greater than or equal to 1 / 2 of the internal volume of the initial temperature water tank.

3. The air source heat pump water supply system according to claim 2, characterized in that, The water replenishment system is also connected to the second inlet of the constant temperature water tank, and is used to replenish water to the constant temperature water tank when the water level inside the constant temperature water tank is lower than the third set water level; Wherein, the first set water level is greater than 1 / 3 of the volume of the initial temperature water tank; the third set water level is less than or equal to 1 / 3 of the volume of the constant temperature water tank.

4. The air source heat pump water supply system according to claim 3, characterized in that, The water replenishment system includes: The first pipe has one end connected to a tap water pipe and the other end connected to the first inlet of the initial temperature water tank. The first pipe is equipped with a first inlet solenoid valve. The second pipe is connected at one end to a tap water pipe and at the other end to the second inlet at the top of the constant temperature water tank. The third pipe is equipped with a second water inlet solenoid valve. The first inlet solenoid valve operates for a first set time period and opens when the water level inside the initial temperature water tank is lower than the first set water level; the second inlet solenoid valve operates for a second set time period and opens when the water level inside the constant temperature water tank is lower than the third set water level.

5. The air source heat pump water supply system according to claim 2, characterized in that, The outlet of the initial temperature water tank is connected to the first inlet of the constant temperature water tank via a water supply pipe; the water supply pipe is equipped with a water supply valve. The working time of the water replenishment valve is a second set time period; the second set time period is within the range of the first set time period, and the start time of the second set time period is m hours later than the start time of the first set time period, where m is a natural number, and m is greater than the time required for the initial temperature water tank to replenish water from an empty water level to the second set water level and heat the water to the first set temperature.

6. The air source heat pump water supply system according to claim 5, characterized in that, The first set time is 8:00-18:00 daily, and the second set time is 10:00-18:00 daily.

7. The air source heat pump water supply system according to any one of claims 1-6, characterized in that, The volume of the initial temperature water tank is smaller than that of the constant temperature water tank; the sum of the volumes of the initial temperature water tank and the constant temperature water tank is greater than the designed water consumption.

8. The air source heat pump water supply system according to any one of claims 1-6, characterized in that, The air source heat pump unit includes: The first air source heat pump unit is connected to the initial temperature water tank and is used to heat the water inside the initial temperature water tank to a first set temperature; wherein, the first set temperature is 27℃-32℃. The second air source heat pump unit is connected to the constant temperature water tank and is used to heat the water inside the constant temperature water tank to a second set temperature; wherein, the first set temperature is 45℃-55℃; and the power of the first air source heat pump unit is 10 kW - 20 kW.

9. The air source heat pump water supply system according to claim 8, characterized in that, The second air source heat pump unit includes multiple air source heat pumps; the multiple air source heat pumps are connected in parallel to simultaneously heat the constant temperature water tank.

10. The air source heat pump water supply system according to any one of claims 1-6, characterized in that: It also includes an electric auxiliary heating system; The electric auxiliary heating system is installed inside the constant temperature water tank and is used as a backup heating device to assist the first air source heat pump unit in heating the water inside the constant temperature water tank.

11. The air source heat pump water supply system according to any one of claims 1-6, characterized in that, Also includes: The return water pipe has one end connected to the third inlet of the constant temperature water tank and the other end connected to the main return water pipe of the room; a temperature controller is installed at the end of the return water pipe. The return water pipe is used to input water from the constant temperature water tank into the room return water main pipe when the temperature controller detects that the water temperature at the end of the return water pipe is lower than the lower limit of the third set temperature, until the water temperature at the end of the return water pipe reaches the upper limit of the third set temperature; the third set temperature is lower than the second set temperature.

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