Air source heat pump water supply system and heating and water replenishing method thereof

Abstract

The invention relates to the technical field of air source heat pumps, in particular to an air source heat pump water supply system and a heating and water supplementing method thereof.The method comprises the steps that when the water level of a constant-temperature water tank in the air source heat pump water supply system is lower than a first set water level, water at the first set temperature is supplemented to the constant-temperature water tank through a primary temperature water tank; water in the constant-temperature water tank is heated to a second set temperature through a first air source heat pump unit in the air source heat pump water supply system; wherein the second set temperature is determined according to the water supply temperature; the first set temperature is determined according to 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 temperature of a preset value. According to the air source heat pump water supply system and the heating and water replenishing method thereof, the water replenishing mode and the heating mode of the constant-temperature water tank are changed, so that the energy efficiency ratio of the air source heat pump water supply system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pumps, and in particular to an air source heat pump water supply system and a heating and water replenishing method thereof. Background Art

[0002] An air-source heat pump is an energy-saving device that uses high-level energy to transfer heat from a low-level heat source, air, to a higher-level heat source. It is a form of heat pump that converts low-level heat energy (such as heat contained in air, soil, and water) that cannot be directly utilized into usable high-level heat energy, thereby saving some high-level energy (such as coal, gas, oil, and electricity).

[0003] Existing air-source heat pump water supply systems typically circulate directly with a constant-temperature water tank, using and replenishing water simultaneously to maintain the water tank's maximum volumetric capacity. Furthermore, air-source heat pump water supply systems typically utilize differential heating, with the upper temperature limit set at 55°C, between 50°C and 55°C in winter. When the temperature falls below the lower limit of 50°C, the air-source heat pump starts heating and stops when the temperature reaches the upper limit. The upper temperature limit in spring, summer, and autumn is 45°C to 50°C.

[0004] Air-source heat pumps transfer heat from the air to the water by consuming electrical energy. According to the reverse Carnot cycle principle, when the water temperature is low, the temperature difference with the air is small, and the heat transfer power is high. The heat pump unit consumes less electricity to transfer heat from the air to the water, resulting in a relatively high energy efficiency ratio. However, as the initial water temperature rises, the temperature difference between the water and the air increases, making heat transfer more difficult. More electricity is required to drive components such as the compressor to complete the heat transfer, resulting in a decrease in the energy efficiency ratio, which in turn causes the energy efficiency ratio of the entire air-source heat pump water supply system to fail to meet demand. Summary of the Invention

[0005] The embodiments of the present invention provide an air source heat pump water supply system and a heating and water replenishment method thereof, which at least solve the problem of relatively low energy efficiency of the air source heat pump water supply system.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The first aspect of the present invention provides a heating and water replenishment method for an air source heat pump water supply system, comprising the following steps: when the water level of a constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of a first set temperature is replenished to the constant temperature water tank through an initial temperature water tank; the water temperature inside the constant temperature water tank is heated to a second set temperature through a first air source heat pump unit in the air source heat pump water supply system; wherein the second set temperature is determined according to the water supply temperature; the first set temperature is determined according to 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.

[0008] Preferably, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is supplemented to the constant temperature water tank through the primary temperature water tank, including: when the water temperature inside the primary temperature water tank is lower than the first set temperature, the water temperature inside the primary temperature water tank is heated to the first set temperature through the second air source heat pump unit; when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is supplemented to the constant temperature water tank through the primary temperature water tank; wherein, the first set temperature is 27℃-32℃, and the second set temperature is 45℃-55℃; the power of the first air source heat pump unit is 10kw-20kw.

[0009] Preferably, when the water temperature inside the primary temperature water tank is lower than the first set temperature, the water temperature inside the primary temperature water tank is heated to the first set temperature by the second air source heat pump unit, including: in the first set time period, when the water temperature inside the primary temperature water tank is lower than the first set temperature, the water temperature inside the primary temperature water tank is heated to the first set temperature by the second air source heat pump unit; wherein the start time of the first set time period is later than 6:00 every day, and the end time of the first set time period is earlier than 19:00 every day.

[0010] Preferably, during a first set time period, when the water temperature inside the primary temperature water tank is lower than the first set temperature, the water temperature inside the primary temperature water tank is heated to the first set temperature by the second air source heat pump unit, including: during 8:00-18:00 every day, when the water temperature inside the primary temperature water tank is lower than the first set temperature, the water temperature inside the primary temperature water tank is heated to the first set temperature by the second air source heat pump unit.

[0011] Preferably, during the first set time period, when the water temperature inside the primary temperature water tank is lower than the first set temperature, before the water temperature inside the primary temperature water tank is heated to the first set temperature by the second air source heat pump unit, the method includes: during the first set time period, when the water level inside the primary temperature water tank in the air source heat pump water supply system is lower than a second set water level, replenishing water into the primary temperature water tank; wherein the second set water level is greater than or equal to 1 / 2 of the internal volume of the primary temperature water tank.

[0012] Preferably, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is supplemented to the constant temperature water tank through the primary temperature water tank, including: in the second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is supplemented to the constant temperature water tank through the primary temperature water tank; wherein, 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, m is a natural number, and m is greater than the time required for the primary temperature water tank to supplement water from the empty water level to the second set water level and heat the water temperature to the first set temperature.

[0013] Preferably, in the second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is supplemented to the constant temperature water tank through the primary temperature water tank, including: from 10:00 to 18:00 every day, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is supplemented to the constant temperature water tank through the primary temperature water tank; wherein, the first set water level is greater than 1 / 3 of the internal volume of the constant temperature water tank.

[0014] Preferably, in the second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is supplemented to the constant temperature water tank through the primary temperature water tank, including: in the second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level and higher than the third set water level, water of the first set temperature is supplemented to the constant temperature water tank through the primary temperature water tank; in the second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the third set water level, emergency water is supplemented to the constant temperature water tank through the water replenishment system; wherein, the first set water level is greater than 1 / 2 of the internal volume of the constant temperature water tank, and the third set water level is less than or equal to 1 / 3 of the internal volume of the constant temperature water tank.

[0015] Preferably, the method further includes: monitoring the temperature of the end probe of the return pipe; the head end of the return pipe is connected to the constant temperature water tank, and the end of the return pipe is connected to each water-using room; when the temperature is lower than a third set temperature, the water inside the constant temperature water tank is pumped into the inside of the return pipe through a pressurized water supply system until the temperature reaches the third set temperature, and the pressurized water supply system is turned off; wherein, the third set temperature is lower than the second set temperature.

[0016] Preferably, the method further includes: when the water temperature inside the constant temperature water tank is lower than a fourth set temperature, auxiliary heating the water inside the constant temperature water tank by an electric heating auxiliary device; wherein the fourth set temperature is higher than the first set temperature and lower than the second set temperature.

[0017] The second aspect of the present invention provides an air source heat pump water supply system, comprising: a constant temperature water tank for storing hot water and supplying water to water users; a primary temperature water tank connected to the constant temperature water tank, for replenishing water to the constant temperature water tank when the water level inside the constant temperature water tank is lower than the second set water level and the water temperature inside the primary temperature water tank reaches the first set temperature; the volume of the primary temperature water tank is half of the designed water volume, and the volume of the primary temperature water tank is smaller than that of the constant temperature water tank; 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 second set temperature is determined according to the water supply temperature; the first set temperature is determined according to the second set temperature and the power of the second air source heat pump unit, so that the energy efficiency ratio of the second air source heat pump unit reaches the preset value.

[0018] Preferably, the first air source heat pump unit is connected to the primary temperature water tank, and is used to heat the water inside the primary temperature water tank to the first set temperature; the water replenishment system is connected to the primary temperature water tank, and is used to replenish water to the primary temperature water tank when the water level inside the primary temperature water tank is lower than the first set water level in a first set time period; wherein, the first set temperature is 27℃-32℃; and the first set time period is 8:00-18:00 every day.

[0019] Preferably, the working time of the second air source heat pump unit is a second set time period; wherein, the second set time period is 10:00-18:00 every day; the first set temperature is and the second set temperature is 45°C-55°C.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention provides an air source heat pump water supply system and a heating and water replenishment method thereof. By adding an initial temperature water tank and heating the water inside the initial temperature water tank to a first preset temperature, the constant temperature water tank is replenished with water, so that the initial temperature of the water replenished into the constant temperature water tank is the first preset temperature, rather than the ambient temperature, so that the first air source heat pump unit only needs to heat the water temperature from the first preset temperature to the second preset temperature, consuming less power. In addition, if the first preset temperature is too high, the temperature difference with the ambient temperature increases, thereby increasing the load of the first air source heat pump unit; and 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 the present invention is determined based on the second set temperature and the power of the second air source heat pump unit to make the energy efficiency ratio of the second air source heat pump unit reach a preset value, thereby fully improving the energy efficiency ratio of the air source heat pump water supply system. Moreover, the constant temperature water tank of the present invention replenishes water when the water level is lower than the first set water level. Compared with the on-demand replenishment mode in the related art, the present invention can reduce the load and operating cost of the air heat source pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without inventive effort.

[0023] Figure 1 This is a flow chart of a method for heating and replenishing water in an air source heat pump water supply system according to an embodiment of the present invention;

[0024] Figure 2 It is a structural diagram of an air source heat pump water supply system according to another embodiment of the present invention.

[0025] Reference numerals in the figures:

[0026] 1. Primary temperature water tank; 2. Second air source heat pump unit; 2-1. Second heat circulation pump; 3. Return water pipe; 3-1. Return water solenoid valve; 4. First air source heat pump unit; 5. First 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 DESCRIPTION

[0027] The following describes embodiments of the present invention in more detail with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying 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 described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the 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.

[0028] The air source heat pump water supply system in the related technology adopts a water replenishment mode of replenishing water while using it, so that the constant temperature water tank always maintains the maximum volume ratio and maintains a full-load carrying state, which unnecessarily increases the operating cost of the air source heat pump, thereby reducing the energy consumption ratio of the air source heat pump water supply system.

[0029] In addition, the air source heat pump units in the related art adopt an all-weather working mode, and the air source heat pump units cannot avoid working in low temperature time periods such as morning and evening. However, as the air source heat pump unit continues to heat the internal water, the temperature of the water continues to rise, and the temperature difference between it and the low temperature environment continues to increase, making heat transfer more difficult. More electricity is required to drive components such as the compressor to complete the heat transfer, resulting in a decrease in the energy consumption ratio of the air source heat pump water supply system. When the ambient temperature is 0°C, the energy efficiency ratio may be 2.0-3.0, and at -10°C, the energy efficiency ratio may drop to 1.5-2.0.

[0030] like Figure 1 As shown, in order to improve the energy efficiency ratio of the air source heat pump water supply system, one embodiment of the present invention provides a heating and water replenishment method for the air source heat pump water supply system, comprising the following steps:

[0031] Step S1: when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is added to the constant temperature water tank through the primary temperature water tank;

[0032] Step S2, heating the water temperature inside the constant temperature water tank to a second set temperature by using the first air source heat pump unit in the air source heat pump water supply system;

[0033] Among them, the second set temperature is determined according to the water supply temperature; the first set temperature is determined according to 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.

[0034] The present invention provides a method for heating and replenishing water for an air source heat pump water supply system. By adding an initial temperature water tank and heating the water inside the initial temperature water tank to a first preset temperature, the constant temperature water tank is replenished with water, so that the initial temperature of the water replenished into the constant temperature water tank is the first preset temperature, rather than the ambient temperature, so that the first air source heat pump unit only needs to heat the water temperature from the first preset temperature to the second preset temperature, consuming less power. In addition, if the first preset temperature is too high, the temperature difference with the ambient temperature increases, thereby increasing the load of the first air source heat pump unit; and 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 the present invention is a temperature determined based on the second set temperature and the power of the second air source heat pump unit to make the energy efficiency ratio of the second air source heat pump unit reach a preset value, thereby fully improving the energy efficiency ratio of the air source heat pump water supply system. Moreover, the constant temperature water tank of the present invention replenishes water when the water level is lower than the first set water level. Compared with the on-demand replenishment mode in the related art, the present invention can reduce the load and operating cost of the air heat source pump unit.

[0035] In a preferred embodiment of the present invention, step S1 includes:

[0036] Step S11, when the water temperature inside the initial temperature water tank is lower than the first set temperature, the water temperature inside the initial temperature water tank is heated to the first set temperature by the second air source heat pump unit;

[0037] Step S12: when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is added to the constant temperature water tank through the primary temperature water tank;

[0038] Among them, the first set temperature is 27℃-32℃, the second set temperature is 45℃-55℃; the power of the first air source heat pump unit is 10-20kw.

[0039] It is worth noting that the air-source heat pump water supply system in the related art directly heats low-temperature water from the tap water pipe to a first set temperature. The water temperature in the tap water pipe is directly proportional to the ambient temperature, which in turn is related to the energy efficiency ratio of the first air-source heat pump unit 4, the operating status of the compressor, the frost condition, and the operational stability.

[0040] If the ambient temperature is low, the water temperature inside the first air-source heat pump will continue to rise as it operates, and the temperature difference between the ambient temperature and the water temperature will increase, causing the air-source heat pump to consume more electricity to raise the water temperature, resulting in a lower energy efficiency ratio. At an ambient temperature of 0°C, the energy efficiency ratio may be 2.0-3.0, and at -10°C, the energy efficiency ratio may drop to 1.5 to 2.0. At the same time, the heating capacity of the air-source heat pump may drop by 30%-50% compared to normal temperature; the temperature difference between the evaporator surface temperature and the ambient temperature increases, which will accelerate the frost formation. Frost will hinder the heat exchange between the air and the evaporator, reducing the heating efficiency of the air-source heat pump unit, thereby reducing the energy efficiency ratio. In severe cases, it will cause the air-source heat pump unit to shut down. In addition, low temperatures will increase the viscosity of the compressor lubricating oil, increase component wear, and affect the operational stability of the air-source heat pump unit.

[0041] If the ambient temperature is high, the compressor will need a higher exhaust pressure and a larger compression ratio to transfer heat to the water, which will increase the work of the compressor, increase power consumption, increase the operating load of the equipment, reduce the service life of the equipment, and may also trigger overheating protection, causing intermittent shutdown of the equipment, affecting heating efficiency and stability, and reducing energy efficiency.

[0042] Therefore, in order to avoid the disadvantages caused by the first air source heat pump unit 4 operating at a lower ambient temperature, the embodiment of the present invention provides an initial temperature water tank 1 to preheat the low-temperature water from the tap water pipe to the initial temperature.

[0043] The heating and water replenishment method for an air-source heat pump water supply system provided in the embodiments of the present invention is primarily used in the field of hotel water supply. Since hotels require hot water temperatures between 45°C and 48°C in the summer and 50°C and 54°C in the winter, the present invention sets the second preset temperature range to between 45°C and 50°C.

[0044] Furthermore, in order to meet the power requirement for water heating, the total power range of the first air source heat pump unit selected in the present invention is 10kw-20kw, and preferably two 10-horsepower air source heat pump units are connected in parallel.

[0045] The present invention fully considers the relationship between the second preset temperature, the power of the second air source heat pump unit, the ambient temperature and the energy efficiency ratio, and sets the first set temperature to 27°C-32°C, so that the water added to the constant temperature water tank has a certain initial temperature, reducing the impact on the energy efficiency ratio of the first air source heat pump unit as the water temperature inside the constant temperature water tank increases and the difference between the ambient temperature increases, thereby enabling the energy efficiency ratio of the first air source heat pump unit to meet the preset value requirements. The preset value is preferably 3. The energy efficiency ratio of the first air source heat pump unit of the present invention can be as high as 3-3.5.

[0046] Furthermore, step S11 preferably includes the following steps:

[0047] Step S111: During a first set time period, when the water temperature inside the primary temperature water tank is lower than a first set temperature, the water temperature inside the primary temperature water tank is heated to the first set temperature by the second air source heat pump unit;

[0048] The start time of the first set time period is later than 6:00 every day, and the end time of the first set time period is earlier than 19:00 every day.

[0049] It is worth noting that, since the low temperature environment will reduce the energy efficiency ratio of the air source heat pump unit, the present invention sets the working start time of the first air source heat pump unit to be later than 6:00 every day and the end time to be later than 19:00 every day. The specific time period can be adjusted according to the sunrise and sunset time of the current season. Overall, it is necessary to start the first air source heat pump unit during the time period when the temperature environment is high during the day.

[0050] In the present invention, it is further preferred that during 8:00-18:00 every day, when the water temperature inside the primary temperature water tank is lower than the first set temperature, the water temperature inside the primary temperature water tank is heated to the first set temperature by the second air source heat pump unit.

[0051] Furthermore, in the specific implementation of the present invention, between 8:00-11:00 every day, the primary temperature water tank is first replenished with 1 / 2 of the water level of the internal volume of the primary temperature water tank, and the second air source heat pump unit is started to heat the water temperature inside the primary temperature water tank until the first preset temperature is reached.

[0052] Then, between 11:00 and 18:00, the water level inside the initial temperature water tank is replenished to the full water level to meet the later water replenishment needs.

[0053] Furthermore, before step S111, the method of the embodiment of the present invention further includes:

[0054] During a first set time period, when the water level inside the primary temperature water tank in the air source heat pump water supply system is lower than a second set water level, water is added to the interior of the primary temperature water tank; wherein the second set water level is greater than or equal to 1 / 2 of the internal volume of the primary temperature water tank.

[0055] The embodiment of the present invention sets the water replenishment time of the primary temperature water tank to be within the first set time period, and replenishes water to the primary temperature water tank only when the water level in the primary temperature water tank is lower than the second set water level, thereby avoiding the use-and-replenishment method adopted in the related art, which affects the power consumption of the second air source heat pump unit.

[0056] Furthermore, step S12 preferably includes the following steps:

[0057] Step S121: During a second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is added to the constant temperature water tank through the primary temperature water tank.

[0058] Among them, the second set time period is within the range of the first set time period, and the starting time of the second set time period is m hours later than the starting time of the first set time period, m is a natural number, and m is greater than the time required for the initial temperature water tank to replenish water from the empty water level to the second set water level and heat the water temperature to the first set temperature.

[0059] Furthermore, step S121 is preferably performed between 10:00 and 18:00 every day, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, the constant temperature water tank is replenished with water of the first set temperature through the initial temperature water tank; wherein the first set water level is greater than 1 / 2 of the internal volume of the constant temperature water tank.

[0060] The present invention provides a time range of 10:00-18:00 every day and a first set water level requirement that is greater than 1 / 3 of the internal volume of the constant temperature water tank, so as to ensure that there is a sufficient water level and water temperature in the initial temperature water tank and that the constant temperature water tank can meet the normal water supply needs of the hotel.

[0061] Furthermore, in order to adapt to emergency situations, step S121 includes:

[0062] Step S1211: During the second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level and higher than the third set water level, water of the first set temperature is added to the constant temperature water tank through the primary temperature water tank;

[0063] Step S1212: During the second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the third set water level, emergency water replenishment is performed to the constant temperature water tank through the water replenishment system;

[0064] Among them, the first set water level is greater than 1 / 3 of the internal volume of the constant temperature water tank, and the third set water level is less than or equal to 1 / 3 of the internal volume of the constant temperature water tank.

[0065] By setting a third set water level, the embodiment of the present invention allows the primary temperature water tank to provide daily water replenishment to the thermostatic water tank during the second set time period when the water level inside the thermostatic water tank is between the first and third set water levels. If the water level inside the thermostatic water tank falls below the third water level, an emergency may have occurred, and the water replenishment system is used to provide emergency water replenishment to the thermostatic water tank.

[0066] Furthermore, the water replenishment system includes: a tap water pipe and an emergency water replenishment valve, one end of the tap water pipe is connected to the tap, and the other end is connected to the water inlet of the constant temperature water tank, and the tap water pipe is switched on and off by the emergency water replenishment valve.

[0067] Furthermore, the method of the embodiment of the present invention further includes the following steps:

[0068] Step S3, monitoring the temperature of the end probe of the return pipe; the head end of the return pipe is connected to the constant temperature water tank, and the end of the return pipe is connected to each water-using room;

[0069] When the temperature is lower than the third set temperature, the water inside the constant temperature water tank is pumped to the inside of the return pipe through the pressurized water supply system until the temperature reaches the third set temperature, and the pressurized water supply system is turned off; wherein the third set temperature is lower than the second set temperature.

[0070] The third set temperature is preferably 5 degrees lower than the second set temperature.

[0071] By setting up a return pipe and a pressurized water supply system, the embodiment of the present invention can ensure that the end of the return pipe reaches the third set temperature, thereby ensuring that hot water is supplied when the hot water switch of each water-using room is turned on, which can reduce the waste of low-temperature water and energy consumption.

[0072] The pressurized water supply system is equipped with a pressure pump, which can play the role of pressurized water supply and return water, thereby ensuring the normal water supply of the constant temperature water tank.

[0073] Furthermore, the air source heat pump water supply system is also equipped with corresponding safety protection devices such as water shortage, over-temperature, phase loss, leakage prevention and lightning protection measures for the first air source heat pump unit, the second air source heat pump unit, the initial temperature water tank and the constant temperature water tank. It works fully automatically according to the set requirements, operates safely and reliably, and does not require special management.

[0074] Furthermore, the method of the embodiment of the present invention further includes the following steps:

[0075] Step S4, when the water temperature inside the constant temperature water tank is lower than a fourth set temperature, the water inside the constant temperature water tank is auxiliary heated by the electric heating auxiliary device; wherein the fourth set temperature is higher than the first set temperature and lower than the second set temperature.

[0076] Specifically, the auxiliary electric heating device is controlled by the water temperature and time of the insulated water tank. The electric heating is performed in an external pipe. If the water temperature in the insulated water tank falls below a set point (e.g., T≤45°C), the auxiliary electric heating device automatically activates and heats the water in the insulated water tank. It stops when the temperature probe reads above a set point (e.g., T≥50°C). If necessary, the water temperature and control parameters can be adjusted based on actual needs to save operating costs.

[0077] like Figure 2 As shown, the second embodiment of the present invention provides an air source heat pump water supply system, comprising:

[0078] A constant temperature water tank 7, used to store hot water and supply water to water users;

[0079] The primary temperature water tank 1 is connected to the constant temperature water tank 7 and is used to replenish water to the constant temperature water tank 7 when the water level inside the constant temperature water tank 7 is lower than the second set water level and the water temperature inside the primary temperature water tank 1 reaches the first set temperature; the volume of the primary temperature water tank 1 is half of the designed water consumption, and the volume of the primary temperature water tank 1 is smaller than that of the constant temperature water tank 7;

[0080] The second air source heat pump unit 4 is connected to the constant temperature water tank 7 and is used to heat the water in the constant temperature water tank 7 to a second set temperature;

[0081] Among them, the second set temperature is determined according to the water supply temperature; the first set temperature is determined according to the second set temperature and the power of the second air source heat pump unit 4, so that the energy efficiency ratio of the second air source heat pump unit 4 reaches the preset value temperature.

[0082] The present invention provides an air source heat pump water supply system, which provides a supporting system for the heating and water replenishment method of the air source heat pump water supply system, provides specific connections and interaction methods for the initial temperature water tank 1, the constant temperature water tank 7, and the second air source heat pump unit 4, and can improve the energy efficiency ratio of the air source heat pump water supply system.

[0083] Specifically, the system of the embodiment of the present invention includes: a cold water tank 9 , a cold water pipe, a hot water pipe and a variable frequency water pump 10 .

[0084] The cold water tank 9 is used to store cold water. Its water inlet is connected to the tap water pipeline, and its cold water outlet is connected to the cold water pipeline. The hot water pipeline is connected to the outlet at the bottom of the constant temperature water tank 7. A variable frequency water pump 10 is connected to the cold and hot water pipelines to supply cold or hot water to the users.

[0085] Furthermore, the first set temperature is 27°C-32°C; wherein, the second set temperature is 45°C-55°C; and the power of the first air source heat pump unit is 10 kW - 20 kW.

[0086] Specifically, the first air source heat pump unit 2 pumps the water inside the primary temperature water tank 1 to the interior of the first air source heat pump unit 2 through the first heat circulation pump 2-1 to heat the water, and when the water temperature at the water outlet of the first air source heat pump unit 2 reaches the first set temperature, the water is sent back to the interior of the primary temperature water tank 1 to achieve heating of the water inside the primary temperature water tank 1.

[0087] The second air source heat pump unit 4 pumps the water inside the constant temperature water tank 7 to the inside of the second air source heat pump unit 4 through the second heat circulation pump 5 to heat the water, and when the water temperature at the water outlet of the second air source heat pump unit 4 reaches the second set temperature, the water is sent back to the inside of the primary temperature water tank 1 to achieve heating of the water inside the constant temperature water tank 7.

[0088] 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 heat the constant temperature water tank synchronously.

[0089] Furthermore, the volume of the primary temperature water tank 1 is smaller than that of the constant temperature water tank 7; the sum of the volume of the primary temperature water tank 1 and the volume of the constant temperature water tank 7 is greater than the designed water consumption.

[0090] Preferably, the volume of the initial temperature water tank 1 is half of the designed water volume.

[0091] Taking the designed water consumption as 10 tons as an example, the capacity of the initial temperature water tank is 5 tons and the capacity of the constant temperature water tank is 12 tons.

[0092] Furthermore, the system of the embodiment of the present invention also includes: a water replenishment system.

[0093] Specifically, the water replenishment system is connected to the first inlet of the primary temperature water tank 1 and is used to replenish water to the primary temperature water tank 1 when the water level inside the primary temperature water tank 1 is lower than the second set water level during the first set time period;

[0094] The start time of the first set time period is later than 6:00 every day, and the end time of the first set time period is earlier than 19:00 every day; the second set water level is greater than or equal to 1 / 2 of the internal volume of the initial temperature water tank 1.

[0095] Since the low temperature environment will reduce the energy efficiency ratio of the air source heat pump unit, the present invention sets the working start time of the first air source heat pump unit 2 to be later than 6:00 every day and the end time to be later than 19:00 every day. The specific time period can be adjusted according to the sunrise and sunset time of the current season. Overall, it is necessary to start the first air source heat pump unit 2 during the time period when the temperature environment is high during the day.

[0096] Furthermore, the first set time period is preferably 8:00-18:00 every day.

[0097] In addition, the water replenishment system is also connected to the second inlet of the thermostatic water tank 7, and an emergency water replenishment valve 8 is installed on the connecting pipe between the water replenishment system and the thermostatic water tank 7. When the water level in the thermostatic water tank 7 falls below a third set water level, the emergency water replenishment valve 8 is opened to replenish water to the thermostatic water tank 7; the first set water level is greater than 1 / 3 of the volume of the primary temperature water tank 1; the third set water level is less than or equal to 1 / 3 of the volume of the thermostatic water tank 7.

[0098] When the water level in the thermostatic water tank 7 is between the first set water level and the third set water level, the primary temperature water tank 1 is used to supply water to the thermostatic water tank 7 during the second set time period. When the water level in the thermostatic water tank 7 is lower than the third water level, an emergency may have occurred, and the water supply system is used to supply water to the thermostatic water tank 7 in an emergency.

[0099] Preferably, the water replenishment system includes:

[0100] A first pipe, one end of which is connected to the tap water pipe and the other end is connected to the first inlet of the initial temperature water tank 1. The first pipe is provided with a first water inlet solenoid valve;

[0101] The second pipe has one end connected to the tap water pipe and the other end connected to the second inlet on the top of the constant temperature water tank 7. The third pipe is provided with a second water inlet solenoid valve;

[0102] Among them, the working time period of the first water inlet solenoid valve is the first set time period, and it opens when the water level inside the initial temperature water tank 1 is lower than the first set water level; the working time period of the second water inlet solenoid valve is the second set time period, and it opens when the water level inside the constant temperature water tank 7 is lower than the third set water level.

[0103] In this embodiment of the present invention, by setting the operating times of the first water inlet solenoid valve and the second water inlet solenoid valve, and by linking the control system with the liquid level sensor 12 to control the opening and closing of the first water inlet solenoid valve and the second water inlet solenoid valve, it is possible to ensure that the primary temperature water tank 1 is replenished with water when the water level is lower than the first set water level during the first set time period. Furthermore, it is possible to ensure that the constant temperature water tank 7 is urgently replenished with water through the water replenishment system when the water level is lower than the third set water level during the second set time period.

[0104] Furthermore, the liquid level sensors 12 are arranged 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.

[0105] Preferably, the outlet of the primary 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 provided with a water supply valve;

[0106] Among them, the working time of the water supply valve is the second set time period; the second set time period is within the range of the first set time period, and the starting time of the second set time period is m hours later than the starting time of the first set time period, 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.

[0107] In the embodiment of the present 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.

[0108] The present invention sets the working time of the water supply valve and links the control system and the temperature sensor to ensure that the primary 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.

[0109] Among them, the temperature sensors are arranged at the outlet of the first air source heat pump unit 2, the outlet of the second air source heat pump unit 4, the inside of the initial temperature water tank 1 and the inside of the constant temperature water tank 7.

[0110] Furthermore, the system of the embodiment of the present invention further includes: an electric auxiliary heating system 6;

[0111] The electric auxiliary heating system 6 is arranged 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 .

[0112] Specifically, the electric auxiliary heating system 6 is controlled by the water temperature and time in the insulated water tank. The electric heating is performed by external pipes. If the water temperature in the insulated water tank falls below a set point (e.g., T≤45°C), the electric auxiliary heating device automatically activates and heats the water in the insulated water tank. It continues heating until the temperature probe reads above a set point (e.g., T≥50°C). If necessary, the operator can adjust the water temperature and other control parameters based on actual needs to save operating costs.

[0113] Furthermore, the system of the embodiment of the present invention further includes: a return pipe 3 and a pressurized water supply system.

[0114] One end of the return pipe 3 is connected to the third inlet of the constant temperature water tank 7, and the other end is connected to the room return main pipe; a temperature controller is provided at the end of the return pipe 3; and a return solenoid valve 3-1 is provided on the return pipe 3.

[0115] The return pipe 3 is used to open the return solenoid valve 3-1 when the temperature controller detects that the water temperature at the end of the return pipe 3 is lower than the lower limit temperature of the third set temperature, and input the water inside the constant temperature water tank 7 into the room return main pipe until the water temperature at the end of the return pipe 3 reaches the upper limit temperature of the third set temperature; the third set temperature is lower than the second set temperature.

[0116] When the temperature is lower than the third set temperature, the water in the thermostatic water tank 7 is pumped into the return pipe 3 by the pressurized water supply system until the temperature reaches the third set temperature, at which point the pressurized water supply system is shut off. The third set temperature is lower than the second set temperature and is preferably 5 degrees Celsius lower than the second set temperature.

[0117] By providing a return pipe 3 and a pressurized water supply system, the embodiment of the present invention ensures that the end of the return pipe 3 reaches the third set temperature, thereby ensuring that hot water is supplied to each water-using room when the hot water switch is turned on, thereby reducing the waste of low-temperature water and energy consumption. The pressurized water supply system is equipped with a pressure pump that can provide pressurized water supply and return water, thereby ensuring the normal water supply of the constant temperature water tank 7.

[0118] Assuming a hotel with 90-100 rooms, the constant temperature water tank 7 has a capacity of 10-12 tons. According to national standards, the average per capita shower consumption for hot water at 45°C-55°C is approximately 75kg-100kg. The designed per capita water consumption is 100-200kg / person, assuming that the hotel rooms are generally double-decker. The first air source heat pump unit 2 includes two 10-hp or three 5-hp air source heat pumps to ensure that the total power of the first air source heat pump unit 2 matches the maximum power demand. The second air source heat pump unit 4 is a 5-hp air source heat pump.

[0119] The air source heat pump water supply system provided by the embodiments of the present invention can also be used in gas boiler applications or solar energy supporting systems.

[0120] Among them, when applied to gas boilers, normal pressure ones are directly matched, while pressure boilers are equipped with water tanks and plate exchangers.

[0121] When applied to a solar energy supporting system, an air source heat pump with corresponding power is added to the solar water tank, and the operating temperature range of the air source heat pump is set.

[0122] It should be noted that the term "including" and its variations used in the embodiments of the present invention are open inclusions, that is, "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 other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative and not restrictive. Those skilled in the art should understand that unless the context clearly indicates otherwise, they should be understood as "one or more".

[0123] The various steps described in the method implementation methods provided by the embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method implementation methods may include additional steps and / or omit the steps shown. The scope of protection of the present invention is not limited in this respect.

[0124] The term "embodiment" in this specification refers to specific features, structures or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments are referenced to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiment.

[0125] The above-described embodiments merely represent several implementation methods of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection. It should be noted that a person of ordinary skill in the art would be able to make various modifications and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A heating and water replenishment method for an air source heat pump water supply system, characterized in that: The following steps are involved: When the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, the constant temperature water tank is replenished with water of the first set temperature through the primary temperature water tank; Heating the water temperature inside the constant temperature water tank to a second set temperature by a first air source heat pump unit in the air source heat pump water supply system; Among them, the second set temperature is determined according to the water supply temperature; the first set temperature is determined according to 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.

2. The heating and water replenishment method for an air source heat pump water supply system according to claim 1, characterized in that: When the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, the constant temperature water tank is replenished with water of the first set temperature through the primary temperature water tank, including: When the water temperature inside the primary temperature water tank is lower than the first set temperature, the water temperature inside the primary temperature water tank is heated to the first set temperature by the second air source heat pump unit; When the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, the constant temperature water tank is replenished with water of the first set temperature through the primary temperature water tank; Among them, the first set temperature is 27°C-32°C, the second set temperature is 45°C-55°C; the power of the first air source heat pump unit is 10kw-20kw.

3. The heating and water replenishment method for an air source heat pump water supply system according to claim 2, characterized in that: When the water temperature inside the primary temperature water tank is lower than the first set temperature, heating the water temperature inside the primary temperature water tank to the first set temperature by the second air source heat pump unit includes: During a first set time period, when the water temperature inside the primary temperature water tank is lower than the first set temperature, the water temperature inside the primary temperature water tank is heated to the first set temperature by the second air source heat pump unit; The start time of the first set time period is later than 6:00 every day, and the end time of the first set time period is earlier than 19:00 every day.

4. The heating and water replenishment method for an air source heat pump water supply system according to claim 3, characterized in that: During a first set time period, when the water temperature inside the primary temperature water tank is lower than the first set temperature, heating the water temperature inside the primary temperature water tank to the first set temperature by the second air source heat pump unit includes: During 8:00-18:00 every day, when the water temperature inside the primary temperature water tank is lower than the first set temperature, the water temperature inside the primary temperature water tank is heated to the first set temperature by the second air source heat pump unit.

5. The heating and water replenishment method of the air source heat pump water supply system according to claim 3, characterized in that: During a first set time period, when the water temperature inside the primary temperature water tank is lower than a first set temperature, the water temperature inside the primary temperature water tank is heated to a temperature lower than the first set temperature by a second air source heat pump unit. The method includes: During a first set time period, when the water level inside the primary temperature water tank in the air source heat pump water supply system is lower than a second set water level, water is added to the primary temperature water tank; Wherein, the second set water level is greater than or equal to 1 / 2 of the internal volume of the initial temperature water tank.

6. The heating and water replenishment method of the air source heat pump water supply system according to claim 3, characterized in that: When the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, the constant temperature water tank is replenished with water of the first set temperature through the primary temperature water tank, including: In a second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is replenished into the constant temperature water tank through the primary temperature water tank; Among them, the second set time period is within the range of the first set time period, and the starting time of the second set time period is m hours later than the starting time of the first set time period, m is a natural number, and m is greater than the time required for the initial temperature water tank to replenish water from the empty water level to the second set water level and heat the water temperature to the first set temperature.

7. The heating and water replenishment method of the air source heat pump water supply system according to claim 6, characterized in that: In a second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, the constant temperature water tank is replenished with water of the first set temperature through the primary temperature water tank, including: Between 10:00 and 18:00 every day, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, water of the first set temperature is replenished into the constant temperature water tank through the primary temperature water tank; Wherein, the first set water level is greater than 1 / 3 of the internal volume of the constant temperature water tank.

8. The heating and water replenishment method for an air source heat pump water supply system according to claim 6, characterized in that: In a second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level, the constant temperature water tank is replenished with water of the first set temperature through the primary temperature water tank, including: During a second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the first set water level and higher than the third set water level, water of the first set temperature is replenished into the constant temperature water tank through the primary temperature water tank; During the second set time period, when the water level of the constant temperature water tank in the air source heat pump water supply system is lower than the third set water level, emergency water replenishment is performed to the constant temperature water tank through the water replenishment system; The first set water level is greater than 1 / 2 of the internal volume of the constant temperature water tank, and the third set water level is less than or equal to 1 / 3 of the internal volume of the constant temperature water tank.

9. The heating and water replenishment method of the air source heat pump water supply system according to claim 1, characterized in that: The method further comprises: Monitor the temperature of the end probe of the return pipe; the head end of the return pipe is connected to the constant temperature water tank, and the end of the return pipe is connected to each water-using room; When the temperature is lower than the third set temperature, the water inside the constant temperature water tank is pumped to the inside of the return pipe through the pressurized water supply system until the temperature reaches the third set temperature, and the pressurized water supply system is turned off; wherein, the third set temperature is lower than the second set temperature.

10. The heating and water replenishment method of the air source heat pump water supply system according to claim 1, characterized in that: The method further comprises: When the water temperature inside the constant temperature water tank is lower than a fourth set temperature, the water inside the constant temperature water tank is auxiliary heated by an electric heating auxiliary device; wherein the fourth set temperature is higher than the first set temperature and lower than the second set temperature.

11. An air source heat pump water supply system, characterized in that: include: Constant temperature water tank, used to store hot water and supply water to the water users; a primary temperature water tank connected to the constant temperature water tank, and configured to replenish water to the constant temperature water tank when the water level inside the constant temperature water tank is lower than the second set water level and the water temperature inside the primary temperature water tank reaches the first set temperature; the volume of the primary temperature water tank is half of the designed water consumption, and the volume of the primary temperature water tank is smaller than that of the constant temperature water tank; a second air source heat pump unit connected to the constant temperature water tank and configured to heat the water in the constant temperature water tank to a second set temperature; Among them, the second set temperature is determined according to the water supply temperature; the first set temperature is determined according to the second set temperature and the power of the second air source heat pump unit, so that the energy efficiency ratio of the second air source heat pump unit reaches a preset value.

12. The air source heat pump water supply system according to claim 11, characterized in that: The system further comprises: a first air source heat pump unit connected to the primary temperature water tank and configured to heat the water in the primary temperature water tank to the first set temperature; a water replenishing system connected to the primary temperature water tank, and configured to replenish water to the primary temperature water tank when the water level inside the primary temperature water tank is lower than a first set water level during a first set time period; Among them, the first set temperature is 27°C-32°C; the first set time period is 8:00-18:00 every day.

13. The air source heat pump water supply system according to claim 11, characterized in that: The working time of the second air source heat pump unit is a second set time period; Among them, the second set time period is 10:00-18:00 every day; the first set temperature is and the second set temperature is 45℃-55℃.

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