Air source heat pump water heating and heating device with auxiliary heat source and control method thereof

Abstract

The application relates to an air source heat pump type hot water heating device with an auxiliary heat source and a control method thereof. The heating device comprises an air source heat pump module, a heat exchange module, an auxiliary heat source module and a heat utilization module. The heat exchange module exchanges heat with the air source heat pump module, and the heat exchange module and the heat utilization module are connected through a circulating water circuit. The backwater end of the heat exchange module is also connected with the auxiliary heat source connected to the circulating water circuit, and the auxiliary heat source assists in heating the water flow output by the heat exchange module when the auxiliary heat source is turned on. The method comprises determining the operation stage of the hot water heating device during normal operation of the air source heat pump module, and controlling the auxiliary heat source module to work in combination with the operation stage. In the above scheme, the air source heat pump module can be operated alone or in combination with the auxiliary heat source module, and sufficient heat can be provided when more heat or defrosting operation is required.

Description

Technical Field

[0001] This invention relates to the technical field of air source heat pump hot water heating devices with auxiliary heat sources, and particularly to an air source heat pump hot water heating device with auxiliary heat sources and its control method. Background Technology

[0002] Air source heat pump water heating systems are widely used in applications such as low-temperature hot water radiant heating or radiator convection heat exchange heating. When the outdoor ambient temperature is low or the outdoor ambient humidity is high, the heating efficiency of the heat pump water heating system will decrease, and the comfort of using the indoor heating terminal will be affected.

[0003] When air source heat pump water heating systems fail to achieve the desired performance or require rapid heat delivery, setting up an auxiliary heat source becomes an excellent solution.

[0004] Commonly used auxiliary heat sources include electric heaters and gas-fired hot water boilers. Compared with air source heat pump hot water heating devices, auxiliary heat sources have higher energy consumption and higher operating costs during the heating process.

[0005] If the auxiliary heat source and the air source heat pump hot water heating device are not properly matched in their operation (e.g., if the auxiliary heat source is put into operation too much but the heat demand of the end user is limited, the return water temperature will be too high, which will lead to a decrease in the operating efficiency of the air source heat pump module), overheating or underheating may occur. This situation will increase energy consumption and affect heating comfort.

[0006] Therefore, it is essential to optimize and control the operation of the auxiliary heat source and the air source heat pump hot water heating device during joint operation. Summary of the Invention

[0007] The present invention aims to solve the problem of energy waste or reduced heating comfort caused by inappropriate auxiliary heat source input rate after starting auxiliary heat source (such as electric auxiliary heating, gas hot water boiler, etc.) when the air source heat pump hot water heating device fails to achieve the expected use effect, resulting in overheating or underheating.

[0008] The hot water circulation control method for the heating terminals matched with air source heat pump hot water heating devices is often a constant flow control or a variable flow system that can be adjusted slightly within a certain range (or a control method that adds a bypass channel to the heating terminal to keep the water flow of the main supply and return water pipe constant, so as to avoid large hydraulic imbalances in each heating terminal, thereby affecting the heating effect of the heating terminal), ensuring that the water flow of the heating terminal varies within the allowable range. After the auxiliary heat source is put into operation, the water flow into the air source heat pump module will decrease because some of the water in the return water pipe flows back to the auxiliary heat source for heating. (Due to the operation of the auxiliary heat source and the reduction in the amount of return water flowing into the air source heat pump module, the heating capacity of the air source heat pump module can be reduced, thus optimizing the heating efficiency of the air source heat pump module or slowing down the deterioration of the heating efficiency of the air source heat pump module.) When the auxiliary heat source has been in operation for a period of time and the air source heat pump module can provide more heat (such as the melting of frost on the outdoor heat exchanger of the air source heat pump module), if the heating capacity of the air source heat pump module is not increased in time, or the heating capacity of the auxiliary heat source is reduced or stopped, the overall heating efficiency of the heating device will be reduced, which is not conducive to the energy-saving operation of the heating device.

[0009] To address the aforementioned problems, this invention provides an air-source heat pump type hot water heating device with an auxiliary heat source and its control method.

[0010] A control method for an air-source heat pump hot water heating device with an auxiliary heat source, the heating device comprising an air-source heat pump module, a heat exchange module, an auxiliary heat source module, and a heat-consuming module; the heat exchange module exchanges heat with the air-source heat pump module, and the heat exchange module and the heat-consuming module are connected via a circulating water circuit; the return water end of the heat exchange module is also connected to the auxiliary heat source in the circulating water circuit, and the auxiliary heat source provides auxiliary heating to the water flow output by the heat exchange module when it is turned on; the method includes the following steps:

[0011] During the normal operation of the air source heat pump module, the operation stage of the hot water heating device is determined, and the auxiliary heat source module is controlled in conjunction with the operation stage. Specifically, the operation stage includes the initial operation stage, the middle operation stage, and the stable operation stage.

[0012] The initial stage of operation includes any of the following:

[0013] When the machine is first turned on and the running time has not reached the first preset time ta, the auxiliary heat source module will not be put into operation.

[0014] When the indoor ambient temperature is higher than the hot water temperature, the auxiliary heat source module is activated; the indoor ambient temperature being higher than the hot water temperature means that the actual indoor ambient temperature of any heat-using device in the heat-using module is higher than the first hot water temperature TRS1.

[0015] When the indoor ambient temperature is low, the auxiliary heat source module is activated; the low indoor ambient temperature means that the actual indoor ambient temperature of all heat-using equipment in the heat-using module is lower than the first judgment temperature Tia of the indoor ambient temperature.

[0016] Mid-term operation includes:

[0017] When the hot water temperature is moderate or the indoor ambient temperature is moderate, the auxiliary heat source module is controlled to maintain its current operating state.

[0018] The term "medium hot water temperature" refers to the first hot water temperature TRS1 in the heat exchange module reaching the preset first hot water temperature judgment temperature TRSa but not reaching the preset second hot water temperature judgment temperature TRSb.

[0019] The term "moderate indoor ambient temperature" means that the actual indoor ambient temperature of any heat-using device in the heat-using module is higher than the first judgment temperature Tia of the indoor ambient temperature, but not higher than the second judgment temperature Tib of the indoor ambient temperature, and the value of Tia is less than the value of Tib.

[0020] The stable operation period includes:

[0021] When the hot water temperature is high or the indoor ambient temperature is high, the auxiliary heat source module will stop operating.

[0022] The higher hot water temperature refers to the first hot water temperature TRS1 in the heat exchange module reaching the preset second hot water temperature judgment temperature TRSb.

[0023] The term "high indoor ambient temperature" refers to the fact that the actual indoor ambient temperature of any heat-using device in the heat-using module is higher than the first judgment temperature Tib of the indoor ambient temperature.

[0024] Preferably, after the auxiliary heat source module is put into operation, the temperature difference of the hot water before and after being heated by the auxiliary heat source module is calculated. If the hot water temperature difference is lower than the preset hot water temperature difference judgment value, the auxiliary heat source module is controlled to stop operating.

[0025] Preferably, the outdoor heat exchanger of the air source heat pump module has two operating modes during defrosting: defrosting operation and defrosting mode. During defrosting operation, the four-way reversing valve of the air source heat pump module switches to cooling mode. During defrosting operation, the four-way reversing valve of the air source heat pump module remains in heating mode. The refrigerant saturation pressure in the air-refrigerant heat exchanger of the air source heat pump module is increased to above the freezing point by reducing the water flow in the refrigerant-water heat exchanger and increasing the refrigerant pressure on the low-pressure side.

[0026] Preferably, the auxiliary heat source module includes a shut-off water valve connected to its circulating water circuit and an auxiliary water pump. During defrosting operation, the shut-off water valve in the auxiliary heat source module is in the open state and the auxiliary water pump is in the running state; the compressor operating frequency in the air source heat pump module is reduced and the throttling device throttling degree is reduced.

[0027] As a preferred option, when the air source heat pump module operates independently, if the air source heat pump module requires defrosting: if the indoor ambient temperature on the heating side is low, the auxiliary heat source module is put into operation; if the indoor ambient temperature on the heating side is high, the auxiliary heat source module is not put into operation, and defrosting is performed directly.

[0028] Preferably, if the indoor ambient temperature on the heat side is moderate, the defrosting or anti-defrosting operation mode is further determined by considering the outdoor ambient temperature of the air source heat pump module. Specifically:

[0029] When the outdoor ambient temperature is high, the auxiliary heat source module is put into heating operation, and the air source heat pump module performs defrosting operation; when the outdoor ambient temperature is low, the auxiliary heat source module is put into heating operation, and the air source heat pump module performs defrosting operation.

[0030] Preferably, when the air source heat pump module and the auxiliary heat source module operate together, if the indoor ambient temperature is low and there is no need for defrosting, the air source heat pump module operates normally, and the auxiliary heat source adjusts the heating load according to the current outlet water temperature of the air source heat pump module and the temperature difference between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is low and there is a need for defrosting, the air source heat pump module operates in defrosting mode, and the auxiliary heat source operates at maximum heating capacity; if the indoor ambient temperature is high and there is no need for defrosting, the auxiliary heat source adjusts the heating load according to the current outlet water temperature of the air source heat pump module and the temperature difference between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is high and there is a need for defrosting, after reducing the heating load of the air source heat pump module and maintaining this state for a period of time, if the unit still has a need for defrosting, the air source heat pump module operates in defrosting mode, and the auxiliary heat source operates at maximum heating capacity.

[0031] The purpose of this application is also to provide an air source heat pump hot water heating device with an auxiliary heat source, the device being used to perform the control method of the air source heat pump hot water heating device with an auxiliary heat source as described in any of the preceding claims.

[0032] Because this application adopts the above-mentioned solution, it has an air source heat pump module and an auxiliary heat source module. The air source heat pump module can operate independently or in conjunction with the auxiliary heat source module, and can provide sufficient heat when more heat is needed or during defrosting operation.

[0033] When the air source heat pump module operates alone, if the hot water temperature is low (which will cause the indoor air temperature on the heating side to rise slowly) or the indoor ambient temperature on the heating side is low, the auxiliary heat source module can be activated to optimize the heating effect.

[0034] When the auxiliary heat source is put into operation, the auxiliary heat source module can be stopped when the outlet water temperature of the air source heat pump module is high, the temperature difference between the outlet water temperature of the air source heat pump module and the water temperature after being heated by the auxiliary heat source is small, or the indoor ambient temperature is high, thereby improving the economic efficiency of use. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the air source heat pump hot water heating device with an auxiliary heat source involved in the present invention.

[0036] Figure 2 This is a schematic diagram of the control mechanism involved in the present invention.

[0037] Figure 3 This is a schematic diagram of the control logic of an air-source heat pump hot water heating device with an auxiliary heat source involved in the present invention. Detailed Implementation

[0038] The embodiments of the present invention are described in detail below.

[0039] The input of auxiliary heat source is controlled and adjusted by detecting the outlet water temperature of the air source heat pump hot water heating device involved in this invention or the actual heat consumption of the heat-using terminal.

[0040] When an air source heat pump hot water heating system is started up for the first time, the unit should be run for a period of time without the auxiliary heat source before the water temperature is judged, in order to avoid detection errors caused by uneven water temperature in the water system.

[0041] This invention divides the air-source heat pump hot water heating device with auxiliary heat source into three operating stages: initial operation, middle operation, and stable operation.

[0042] 1. Initial stage of operation:

[0043] 1) Definition of initial operation: the initial start-up stage, the indoor temperature is higher than the hot water temperature (the indoor temperature corresponding to at least one heat terminal is higher than the hot water outlet temperature), and the indoor temperature is lower.

[0044] 2) Operation status of the auxiliary heat source module during the initial stage of operation:

[0045] a. Initial startup phase (when t does not reach ≥ta): The auxiliary heat source module is not put into operation (to avoid the auxiliary heat source module being mistakenly put into operation due to the distortion of hot water temperature acquisition during the initial startup phase, which would increase energy consumption);

[0046] b. When the indoor temperature is higher than the hot water temperature (Ti1≥Trs1 or Ti2≥Trs1): the auxiliary heat source module is put into operation (to avoid the indoor temperature from dropping due to the hot water temperature being too low);

[0047] c. When the indoor temperature is low (Ti1≤Tia and Ti2≤Tia): the auxiliary heat source module is put into operation (to ensure the hot water heating rate and increase the indoor temperature as soon as possible).

[0048] 2. Mid-stage of operation:

[0049] 1) Mid-term operation definition: medium hot water temperature and medium indoor ambient temperature.

[0050] 2) Operation status of the auxiliary heat source module during the mid-term operation:

[0051] a. Hot water temperature is moderate (satisfying Trs1≥Trsa and not satisfying Trs1≥Trsb): Auxiliary heat source maintains the current operating state;

[0052] b. The indoor ambient temperature is moderate (not satisfying Ti1≤Tia and Ti2≤Tia, and not satisfying Ti1≥Tib and Ti2≥Tib): The auxiliary heat source maintains the current operating state.

[0053] 3. Stable operation period:

[0054] 1) Definition of stable operation period: hot water temperature is relatively high, and indoor ambient temperature is relatively high.

[0055] 2) Operation status of the auxiliary heat source module during the stable operation period:

[0056] a. If the hot water temperature is high (Trs1≥Trsb): the auxiliary heat source stops operating;

[0057] b. If the indoor ambient temperature is high (Ti1≥Tib and Ti2≥Tib): the auxiliary heat source stops operating.

[0058] The air-source heat pump hot water heating device with auxiliary heat source involved in this invention can execute different defrosting operation control schemes based on whether the detected air-source heat pump module needs to defrost, combined with the current operating range of the hot water heating device.

[0059] 1. When the auxiliary heat source is not in operation:

[0060] 1) When the hot water outlet temperature is high:

[0061] a. When there is no defrosting requirement: only the air source heat pump module is put into heating operation, and the auxiliary heat source is not put into heating operation;

[0062] b. When defrosting is required:

[0063] ① The indoor ambient temperature is high: the air source heat pump modular defrost operation is in progress, and the auxiliary heat source is not put into heating operation (at this time, using water-side heat for defrosting will not have a significant impact on indoor comfort).

[0064] ② When the indoor ambient temperature is moderate: When the outdoor ambient temperature is high, the auxiliary heat source is put into operation, and the air source heat pump module performs defrosting operation (when the indoor ambient temperature is not high and the outdoor ambient temperature is high, defrosting is avoided as much as possible, and the heating effect is maintained by using defrosting operation. If the expected defrosting effect is not achieved after a period of defrosting operation, defrosting operation is initiated); when the outdoor ambient temperature is low, the auxiliary heat source is put into heating operation, and the air source heat pump module performs defrosting operation (defrosting operation cannot achieve the defrosting effect).

[0065] ③ The indoor ambient temperature is low: the outdoor heat exchanger is defrosted and the auxiliary heat source is put into heating operation;

[0066] 2) When the hot water outlet temperature is low:

[0067] a. If the indoor ambient temperature is low or moderate: the auxiliary heat source module is put into operation;

[0068] b. If the indoor ambient temperature is high: reduce the operating load of the air source heat pump module and do not put the auxiliary heat source module into operation.

[0069] 2. When the auxiliary heat source is put into operation:

[0070] 1) The indoor ambient temperature is low

[0071] a. When there is no defrosting requirement: The air source heat pump module operates normally, and the auxiliary heat source adjusts the heating load according to the current outlet water temperature of the air source heat pump module and the temperature difference between the indoor ambient temperature and the set temperature.

[0072] b. When defrosting is required: The air source heat pump modular defrost operation is activated, and the auxiliary heat source operates at maximum heat supply.

[0073] 2) The indoor temperature is relatively high:

[0074] a. When there is no defrosting requirement: The auxiliary heat source adjusts the heating load according to the current outlet water temperature of the air source heat pump module and the temperature difference between the indoor ambient temperature and the set temperature (the temperature difference between the outlet water temperature of the air source heat pump module and the mixed water temperature after the hot water heated by the auxiliary heat source is mixed with the outlet water of the air source heat pump module is small, so the heating ratio of the auxiliary heat source is reduced or stopped, and the heating ratio of the air source heat pump module is increased).

[0075] b. When defrosting is required: After reducing the heating load of the air source heat pump module and maintaining this state for a period of time, if the unit still needs defrosting, the air source heat pump module will operate in defrosting mode to assist the heat source in maximizing its heating capacity.

[0076] 3) When the auxiliary heat source is put into operation, the indoor ambient temperature is low. After a period of operation, when the indoor ambient temperature is high, the operation shall be carried out in accordance with the control scheme 2) after the auxiliary heat source is put into operation.

[0077] like Figure 1 As shown, the air source heat pump hot water heating device 1 with auxiliary heat source involved in the present invention is composed of an air source heat pump module 10, a heat exchange module 20, an auxiliary heat source module 30, a heat consumption module 40, a water supply pipe 50, a return water pipe 60, and a control mechanism 70.

[0078] The air source heat pump module 10 consists of a compressor 11, an exhaust temperature sensor 12, a four-way reversing valve 13, an air-refrigerant heat exchanger 14, a fan 15, and a throttling mechanism 16.

[0079] Compressor 11 is a variable speed compressor that can compress low-temperature, low-pressure refrigerant into high-temperature, high-pressure refrigerant, and also provides power for the refrigerant to flow in the refrigeration pipes.

[0080] The exhaust temperature sensor 12 can detect the temperature of the high-temperature refrigerant discharged by the compressor.

[0081] The four-way reversing valve 13, by switching its direction, can change the flow direction of the refrigerant inside the four-way reversing valve. The four-way reversing valve 13 has heating (…) Figure 1 (solid line inside the four-way reversing valve) and refrigeration ( Figure 1 The four-way reversing valve has two operating states (dashed line inside).

[0082] Air-refrigerant heat exchanger 14, which is capable of exchanging heat between the refrigerant flowing through it and the outdoor air flowing through it.

[0083] The fan 15 can enhance the airflow on the surface of the air-refrigerant heat exchanger 14 and improve the heat exchange effect on the air side of the air-refrigerant heat exchanger 104.

[0084] The throttling mechanism 16 may be a flow-adjustable electronic expansion valve (or other flow-adjustable throttling mechanism).

[0085] The heat exchange module 20 consists of a first outlet water temperature sensor 21, a refrigerant-water heat exchanger 22, and a circulating water pump 23.

[0086] The first outlet water temperature sensor 21 can detect the water temperature at the outlet of the refrigerant-water heat exchanger 22.

[0087] The refrigerant-water heat exchanger 22 is capable of exchanging heat between the refrigerant flowing through it and the water flowing through it.

[0088] The refrigerant-water heat exchanger 22 has four ports: a, b, c, and d.

[0089] The refrigerant-water heat exchanger 22 has refrigerant interfaces at ports a and b. During heating operation, the refrigerant flows into the refrigerant-water heat exchanger 22 from port a and flows out of the refrigerant-water heat exchanger 22 from port b.

[0090] The c and d ports of the refrigerant-water heat exchanger 22 are circulating water ports. Circulating water flows into the refrigerant-water heat exchanger 22 from port c and flows out of the refrigerant-water heat exchanger 22 from port d.

[0091] The circulating water pump 23 provides the power for circulating water within the water system.

[0092] The auxiliary heat source module 30 involved in this invention consists of an auxiliary heat source 31, an auxiliary circulating water pump 32, a second outlet water temperature sensor 33, and a shut-off valve 34.

[0093] The auxiliary heat source 31 can provide auxiliary heating for circulating water, and can be heating equipment such as electric auxiliary heating or gas-fired hot water boiler.

[0094] The auxiliary circulating water pump 32 provides the power for circulating water within the water system.

[0095] The second outlet water temperature sensor 33 can detect the water temperature of the mixed water after it has been heated by the refrigerant-water heat exchanger 22 and the auxiliary heat source 31.

[0096] like Figure 1 As shown, the shut-off valve 34 involved in this invention has two states: open and closed. When the shut-off valve 34 is open, circulating water can pass through its interior. When the shut-off valve 34 is closed, circulating water cannot pass through its interior.

[0097] The heat-using module 40 is a terminal heat-using part. The present invention is described with the terminal heat-using part having two sets of heat exchangers (heat exchangers 41 and 42). Each set of heat exchangers in the heat-using module 40 also has a shut-off valve (not shown) and an indoor ambient temperature sensor (not shown).

[0098] Heat exchangers 41 and 42 are capable of dissipating the heat carried by the water flowing through them into the indoor space.

[0099] The shut-off valve (not shown) involved in this invention has two states: open and closed. When the shut-off valve is open, water can pass through its interior, and when the shut-off valve is closed, water cannot pass through its interior.

[0100] The indoor ambient temperature sensor (not shown) involved in this invention is capable of detecting the ambient temperature of the space where the heat exchanger 41 or heat exchanger 42 is located.

[0101] Water supply pipe 50 is the channel through which hot water flows from heat exchange module 20 or auxiliary heat source module 30 to heat use module 40.

[0102] The return water pipe 60 is the channel through which hot water flows from the heat-using module 40 to the heat exchange module 20 or the auxiliary heat source module 30.

[0103] The control mechanism 70 is capable of collecting the operating status of each component in the air source heat pump module 10, heat exchange module 20, auxiliary heat source module 30, and heat use module 40, and controlling the operating status of each component in the air source heat pump module 10, heat exchange module 20, auxiliary heat source module 30, and heat use module 40.

[0104] like Figure 2 As shown, the control mechanism 70 involved in this invention consists of an operation information acquisition module 71, an operation status detection module 72, an operation status control module 73, and an auxiliary heat source control module 74.

[0105] The operation information acquisition module 71 can receive the operation parameter information set by the user.

[0106] The operation status detection module 72 is capable of detecting the operating status of the unit.

[0107] The operation status control module 73 is capable of acquiring the operation status information of the air source heat pump hot water supply device.

[0108] The auxiliary heat source control module 74 is capable of controlling the operating status of the auxiliary heat source.

[0109] The hot water supply device in this embodiment includes an air source heat pump module and an auxiliary heat source module. The air source heat pump module can operate independently or in conjunction with the auxiliary heat source module, providing sufficient heat when more heat is needed or during defrosting operation. When the air source heat pump module operates independently, if the hot water temperature is low (resulting in a slower rise in indoor air temperature on the heat-consuming side) or the indoor ambient temperature on the heat-consuming side is low, the auxiliary heat source module can be activated to optimize the heating effect on the heat-consuming side. When the auxiliary heat source is activated, the auxiliary heat source module can be deactivated when the outlet water temperature of the air source heat pump module is high, the temperature difference between the outlet water temperature of the air source heat pump module and the water temperature heated by the auxiliary heat source is small, or the indoor ambient temperature is high, thereby improving the economic efficiency of use.

[0110] In the initial stage of operation of the air source heat pump module, no judgment is made as to whether the auxiliary heat source needs to be turned on. As the hot water temperature rises, the heating efficiency of the auxiliary heat source gradually decreases. The air source heat pump hot water supply device involved in this invention can control the on and off of the auxiliary heat source based on the temperature difference of the hot water before and after heating by the auxiliary heat source. If the temperature difference of the hot water before and after heating by the auxiliary heat source is too small, the operation of the auxiliary heat source can be stopped, thereby improving the overall energy utilization rate. When the hot water temperature is low and the indoor ambient temperature is higher than the hot water temperature, the auxiliary heat source is put into operation.

[0111] In this embodiment, the hot water supply device operates in two modes when defrosting the outdoor heat exchanger of the heat pump module: defrosting operation and defrosting mode. During defrosting operation, the four-way reversing valve switches to cooling mode, and the heat pump module does not operate in heating mode. During defrosting operation, the four-way reversing valve remains in heating mode, the shut-off water valve 34 is in the open state, the auxiliary water pump 32 is in the running state, the compressor operating frequency is reduced, and the throttling device throttling degree is reduced (both of these actions can increase the pressure on the low-pressure side of the refrigerant, reducing or stopping the refrigerant from absorbing heat from the air-refrigerant heat exchanger). By reducing the water flow rate in the refrigerant-water heat exchanger (reducing the heat absorbed by the water from the refrigerant) and increasing the refrigerant pressure on the low-pressure side, the saturated pressure of the refrigerant in the air-refrigerant heat exchanger is increased to above the freezing point, thus performing defrosting operation on the air-refrigerant heat exchanger. When the air source heat pump module operates independently, if it requires defrosting: if the indoor air temperature on the heating side is low, the auxiliary heat source module can be activated to increase heating capacity and shorten defrosting time, avoiding impact on the heating performance during defrosting; if the indoor air temperature on the heating side is high, the auxiliary heat source module should not be activated, and defrosting should proceed directly, avoiding increased energy consumption after activating the auxiliary heat source. The following combines... Figure 3 The control methods will be further explained.

[0112] Figure 3 This is a schematic diagram of the control logic of an air-source heat pump hot water heating device with an auxiliary heat source involved in this invention. Generally, hot water heating adopts two forms: floor radiant heating or radiator heating.

[0113] 1) The hot water supply temperature of the heating terminal for floor radiant heating is generally 35-50℃, and the temperature difference between the supply and return water is generally designed to be no more than 10℃.

[0114] 2) The supply / return water temperature of the heating terminal of the radiator is generally designed to be 75℃ / 50℃.

[0115] Since different types of heating terminals have different requirements for hot water temperature, the control method involved in this invention is described with the heating terminal being floor radiant heating, and the hot water supply temperature of the floor radiant heating terminal is 40℃.

[0116] This embodiment is described with the heat-using module 40 having two heat-using terminals.

[0117] like Figure 3 As shown, the operation control method of the air source heat pump hot water supply device with auxiliary heat source involved in this invention consists of 38 steps, and each step is described in detail below:

[0118] S1: Start the program and proceed to step S1;

[0119] S2: Set the initial startup indicator K=0 and the indoor ambient temperature indicator A=0, then proceed to step S2;

[0120] S3: Receive the operating parameters set by the user, obtain the indoor ambient setting temperature Ts1 of the first heating terminal, obtain the indoor ambient setting temperature Ts2 of the first heating terminal, and then proceed to S4.

[0121] S4: The air source heat pump module is operating normally, then proceed to step S5;

[0122] S5: Determine whether the initial startup symbol K is equal to 0. If K = 0, proceed to step S6; otherwise, proceed to step S8.

[0123] S6: Calculate the running time t1, and then proceed to step S7;

[0124] S7: Compare the statistical operating time t1 data with the preset time judgment threshold ta. If t1≥ta, proceed to step S8; otherwise, proceed to step S6.

[0125] S8: Set the initial start-up operation flag K=1, obtain the hot water temperature TRS1 detected by the first outlet water temperature sensor, and obtain the defrosting status;

[0126] S9: Determine whether the unit needs to be defrosted. If it is determined that defrosting is required, proceed to step S10; otherwise, proceed to step S21.

[0127] S10: Compare the hot water temperature Trs1 detected by the first outlet water temperature sensor with the preset hot water temperature second judgment temperature Trsb. If Trs1≥Trsb, proceed to step S11; otherwise, proceed to step S14.

[0128] S11: Determine whether the value of the indoor ambient temperature marker symbol A is equal to 1. If A = 1, proceed to step S12; otherwise, proceed to step S16.

[0129] S12: The air source heat pump module performs defrosting operation, and then proceeds to step S13;

[0130] S13: Determine whether the air source heat pump module has completed defrosting operation. If defrosting is completed, proceed to step S4; otherwise, proceed to step S12.

[0131] S14: The air source heat pump module performs defrosting operation, the auxiliary heat source is put into operation, and then proceeds to step S15.

[0132] S15: Determine whether the air source heat pump module has completed defrosting operation. If defrosting is completed, proceed to step S4; otherwise, proceed to step S14.

[0133] S16: Determine whether the value of the indoor ambient temperature marker symbol A is equal to 2. If A = 2, proceed to step S17; otherwise, proceed to step S14.

[0134] S17: The auxiliary heat source is put into operation, and then proceed to step S18;

[0135] S18: Perform defrosting operation on the air source heat pump module, record the defrosting operation time t2, and then proceed to step S19;

[0136] S19: Compare the statistical defrosting operation time t2 with the preset time judgment threshold tb. If t2≥tb, proceed to step S20; otherwise, proceed to step S18.

[0137] S20: Set the statistical defrosting operation time t2 = 0, restore the auxiliary heat source module to the state before entering defrosting operation, and then proceed to step S12;

[0138] S21: Compare the hot water temperature Trs1 detected by the first outlet water temperature sensor with the preset hot water temperature first judgment temperature Trsa. If Trs1≥Trsa, proceed to step S31; otherwise, proceed to step S22.

[0139] S22: Obtain the actual indoor temperature Ti1 of the first heating terminal, obtain the actual indoor temperature Ti2 of the second heating terminal, and then proceed to step S23;

[0140] S23: Compare the obtained actual indoor ambient temperature Ti1 of the first heating terminal and the actual indoor ambient temperature Ti2 of the second heating terminal with the hot water temperature Trs1 detected by the first outlet water temperature sensor. If Ti1≥Trs1 or Ti2≥Trs1, proceed to step S24; otherwise, proceed to step S25.

[0141] S24: Set the indoor ambient temperature marking symbol A=0, start the auxiliary heat source, and then proceed to step S4;

[0142] S25: Compare the obtained actual indoor ambient temperature Ti1 of the first heating terminal and the actual indoor ambient temperature Ti2 of the second heating terminal with the first judgment temperature Tia of the indoor ambient temperature. If Ti1≤Tia and Ti2≤Tia, proceed to step S24; otherwise, proceed to step S26.

[0143] S26: Compare the obtained actual indoor ambient temperature Ti1 of the first heating terminal and the actual indoor ambient temperature Ti2 of the second heating terminal with the second judgment temperature Tib of the indoor ambient temperature. If Ti1≥Tib and Ti2≥Tib, proceed to step S27; otherwise, proceed to step S29.

[0144] S27: Set the indoor ambient temperature symbol A = 1, and then proceed to step S28;

[0145] S28: The auxiliary heat source is not put into operation, and then proceed to step S4;

[0146] S29: Set the indoor ambient temperature symbol A=2, and then proceed to step S30;

[0147] S30: The auxiliary heat source maintains the current operating state, and then proceeds to step S4;

[0148] S31: Compare the hot water temperature Trs1 detected by the first outlet water temperature sensor with the preset hot water temperature second judgment temperature Trsb. If Trs1≥Trsb, proceed to step S32; otherwise, proceed to step S35.

[0149] S32: Compare the obtained actual indoor ambient temperature Ti1 of the first heating terminal and the actual indoor ambient temperature Ti2 of the second heating terminal with the second judgment temperature Tib of the indoor ambient temperature. If Ti1≥Tib and Ti2≥Tib, proceed to step S33; otherwise, proceed to step S34.

[0150] S33: The auxiliary heat source is not put into operation, and then proceed to step S4;

[0151] S34: The auxiliary heat source maintains the current operating state, and then proceeds to step S4;

[0152] S35: Obtain the hot water temperature Trs2 detected by the second outlet water temperature sensor, calculate the temperature difference ΔTrs (ΔTrs = Trs2 - Trs1) between the hot water temperature Trs1 detected by the first outlet water temperature sensor and the hot water temperature Trs2 detected by the second outlet water temperature sensor, and then proceed to step S36.

[0153] S36: Compare the calculated ΔT rs with the hot water temperature difference judgment temperature Trsc. If ΔT rs≤Trsc, proceed to step S38; otherwise, proceed to step S37.

[0154] S37: The auxiliary heat source maintains the current operating state, and then proceeds to step S4;

[0155] S38: The auxiliary heat source is not put into operation, and then proceed to step S4.

[0156] Symbol explanation:

[0157] To: Outdoor ambient temperature, °C;

[0158] Toa: Outdoor ambient temperature threshold, in °C. For example, Toa is preset to 5 °C.

[0159] Ts1: The set temperature of the indoor environment for the first heating terminal, in °C;

[0160] Ts2: The indoor ambient temperature set for the second heating terminal, in °C;

[0161] Ti1: Actual indoor temperature of the first heating terminal, in °C;

[0162] Ti2: Actual indoor temperature of the second heating terminal, in °C;

[0163] Tia: The first temperature to be judged for indoor ambient temperature, in °C. For example, Tia is preset to 20°C.

[0164] Tib: The second temperature to be judged for indoor ambient temperature, in °C, e.g., Tib is preset to 25°C;

[0165] Trs1: The hot water temperature detected by the first outlet water temperature sensor, in °C;

[0166] Trs2: The hot water temperature detected by the second outlet water temperature sensor, in °C;

[0167] Trsa: The first temperature to determine for hot water, in °C, e.g., Trsa is preset to 25 °C;

[0168] Trsb: The second temperature to determine hot water temperature, in °C, e.g., Trsb is preset to 35°C;

[0169] Trsc: Hot water temperature difference determines temperature, in °C, e.g., Trsc is preset to 5 °C;

[0170] △T rs: The temperature difference between the hot water temperature detected by the second outlet water temperature sensor and the hot water temperature detected by the first outlet water temperature sensor, in °C;

[0171] t1: Operating time statistics parameter, in minutes;

[0172] t2: Statistical parameter for defrosting operation time, in minutes;

[0173] ta: The threshold for judging the running time, such as ta being preset to 5 minutes;

[0174] tb: Threshold for judging defrosting operation time, such as tb preset to 10min;

[0175] K: Initial start-up symbol. K=0 indicates initial start-up, K=1 indicates non-initial start-up (because the water has a large specific volume, the water in the water system heats up slowly, and the control method is different between the first start-up and non-initial start-up, so this judgment is made here).

[0176] A: Indoor ambient temperature marking symbol. A=0 indicates that the indoor ambient temperature is low, A=1 indicates that the indoor ambient temperature is high, and A=2 indicates that the indoor ambient temperature corresponding to at least one heating terminal is in the middle range.

[0177] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for an air-source heat pump type hot water heating device with an auxiliary heat source, the heating device comprising an air-source heat pump module, a heat exchange module, an auxiliary heat source module, and a heat-consuming module; the heat exchange module exchanges heat with the air-source heat pump module, and the heat exchange module and the heat-consuming module are connected via a circulating water circuit; the return water end of the heat exchange module is also connected to the auxiliary heat source connected to the circulating water circuit, and when the auxiliary heat source is turned on, it provides auxiliary heating to the water flow output by the heat exchange module; characterized in that, The method includes the following steps: During the normal operation of the air source heat pump module, the operation stage of the hot water heating device is determined, and the auxiliary heat source module is controlled in conjunction with the operation stage. Specifically, the operation stage includes the initial operation stage, the middle operation stage, and the stable operation stage. The initial stage of operation includes any of the following: When the machine is first turned on and the running time has not reached the first preset time ta, the auxiliary heat source module will not be put into operation. When the indoor ambient temperature is higher than the hot water temperature, the auxiliary heat source module is activated; the indoor ambient temperature being higher than the hot water temperature refers to the actual indoor ambient temperature of any heat-using device in the heat-using module being higher than the first hot water temperature T. rs1 ; When the indoor ambient temperature is low, the auxiliary heat source module is activated; the low indoor ambient temperature refers to the actual indoor ambient temperature of all heat-using equipment in the heat-using module being lower than the first judgment temperature T. ia ; Mid-term operation includes: When the hot water temperature is moderate or the indoor ambient temperature is moderate, the auxiliary heat source module is controlled to maintain its current operating state. The term "medium hot water temperature" refers to the first hot water temperature T in the heat exchange module. rs1 The first judgment temperature T is when the preset hot water temperature is reached. rsa However, the preset hot water temperature (second judgment temperature T) was not reached. rsb ; The term "moderate indoor ambient temperature" refers to a temperature where the actual indoor ambient temperature of any heat-using device in the heat-using module is higher than the first judgment temperature T. ia However, the indoor ambient temperature (T) was not reached. ib ,T ia The value is less than T ib The value; The stable operation period includes: When the hot water temperature is high or the indoor ambient temperature is high, the auxiliary heat source module will stop operating. The higher hot water temperature refers to the first hot water temperature T in the heat exchange module. rs1 The second judgment temperature T reaches the preset hot water temperature. rsb The term "high indoor ambient temperature" refers to a situation where the actual indoor ambient temperature of any heating device in the heating module is higher than the first judgment temperature T. ib .

2. The control method for an air-source heat pump hot water heating device with an auxiliary heat source according to claim 1, characterized in that, After the auxiliary heat source module is put into operation, the temperature difference of the hot water before and after being heated by the auxiliary heat source module is calculated. If the hot water temperature difference is lower than the preset hot water temperature difference judgment value, the auxiliary heat source module is controlled to stop operating.

3. The control method for an air-source heat pump hot water heating device with an auxiliary heat source according to claim 1, characterized in that, There are two operating modes for the outdoor heat exchanger of the air source heat pump module during defrosting: defrosting operation and defrosting mode. During defrosting operation, the four-way reversing valve of the air source heat pump module switches to the cooling state. During defrosting operation, the four-way reversing valve of the air source heat pump module remains in the heating state. The refrigerant saturation pressure in the air-refrigerant heat exchanger of the air source heat pump module is increased to above the freezing point by reducing the water flow in the refrigerant-water heat exchanger and increasing the refrigerant pressure on the low-pressure side.

4. The control method for an air-source heat pump hot water heating device with an auxiliary heat source according to claim 3, characterized in that, The auxiliary heat source module includes a shut-off water valve connected to its circulating water circuit and an auxiliary water pump. During defrosting operation, the shut-off water valve in the auxiliary heat source module is in the open state and the auxiliary water pump is in the running state; the compressor operating frequency in the air source heat pump module is reduced and the throttling device throttling degree is reduced.

5. The control method for an air-source heat pump hot water heating device with an auxiliary heat source according to claim 3, characterized in that, When the air source heat pump module operates independently, if the air source heat pump module needs to defrost: if the indoor ambient temperature on the heating side is low, the auxiliary heat source module will be put into operation; if the indoor ambient temperature on the heating side is high, the auxiliary heat source module will not be put into operation, and defrosting will be performed directly.

6. The control method for an air-source heat pump hot water heating device with an auxiliary heat source according to claim 5, characterized in that, If the indoor ambient temperature on the heat side is moderate, the outdoor ambient temperature of the air source heat pump module should be further considered to determine whether to implement defrosting or anti-defrosting operation mode. Specifically: When the outdoor ambient temperature is high, the auxiliary heat source module is put into heating operation, and the air source heat pump module performs defrosting operation; when the outdoor ambient temperature is low, the auxiliary heat source module is put into heating operation, and the air source heat pump module performs defrosting operation.

7. The control method for an air-source heat pump hot water heating device with an auxiliary heat source according to claim 3, characterized in that, When the air source heat pump module and the auxiliary heat source module operate together, if the indoor ambient temperature is low and there is no need for defrosting, the air source heat pump module operates normally, and the auxiliary heat source adjusts the heating load according to the current outlet water temperature of the air source heat pump module and the temperature difference between the indoor ambient temperature and the set temperature. If the indoor ambient temperature is low and there is a need for defrosting, the air source heat pump module defrosts, and the auxiliary heat source operates at maximum heating capacity. If the indoor ambient temperature is high and there is no need for defrosting, the auxiliary heat source adjusts the heating load according to the current outlet water temperature of the air source heat pump module and the temperature difference between the indoor ambient temperature and the set temperature. If the indoor ambient temperature is high and there is a need for defrosting, after reducing the heating load of the air source heat pump module and maintaining this state for a period of time, if the unit still needs defrosting, the air source heat pump module defrosts, and the auxiliary heat source operates at maximum heating capacity.

8. An air-source heat pump type hot water heating device with an auxiliary heat source, characterized in that, The device is used to perform the control method of an air-source heat pump hot water heating device with an auxiliary heat source as described in any one of claims 1-7.

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