Air source heat pump type hot water heating device with auxiliary heat source and control method of air source heat pump type hot water heating device

Abstract

The invention relates to an air source heat pump type hot water heating device with an auxiliary heat source and a control method of the air source heat pump type hot water heating device. 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 is connected with the heat utilization module through a circulating water path; the water return end of the heat exchange module is further connected with an auxiliary heat source connected into the circulating water path, and when the auxiliary heat source is started, water flow output by the heat exchange module is subjected to auxiliary heating. The method comprises the steps that in the normal operation process 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 to work in combination with the operation stage. According to the scheme, the air source heat pump module can operate independently or operate in combination with the auxiliary heat source module, more heat is needed, or enough heat can be provided during defrosting operation.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pump type hot water heating devices with auxiliary heat sources, and in particular to an air source heat pump type hot water heating device with auxiliary heat sources and a control method thereof. Background Art

[0002] Air source heat pump hot water heating devices are widely used in low-temperature hot water radiation heating or radiator convection heat exchange heating and other applications. When the outdoor ambient temperature is low or the outdoor ambient humidity is high, the heating efficiency of the heat pump hot water heating device will be reduced, and the comfort of use of the indoor heating terminal will be affected.

[0003] When the air source heat pump hot water heating device cannot achieve the expected effect or needs to provide heat quickly in a short time, setting up an auxiliary heat source becomes a good solution.

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

[0005] If the operating states of the auxiliary heat source and the air source heat pump hot water heating device are not matched reasonably during their joint operation (for example, the auxiliary heat source is put into operation too much but the heat demand at the heat terminal 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 insufficient heating will easily occur, which will increase energy consumption and affect heating comfort.

[0006] Therefore, it is very necessary to optimize the operating state 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 that when an air source heat pump hot water heating device cannot achieve the expected use effect, after the auxiliary heat source (such as electric auxiliary heating, gas hot water boiler, etc.) is started, the auxiliary heat source input rate is not appropriate, resulting in energy waste or heating comfort affected by overheating or insufficient heating.

[0008] The hot water circulation control method of the heating end matched with the air source heat pump hot water heating device 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 increases a bypass channel at the heating end to keep the water flow of the supply and return water mains constant, avoiding large hydraulic imbalances at each heating end, thereby affecting the heating effect of the heating end), to ensure that the water flow at the heating end changes within the allowable range. After the auxiliary heat source is put into operation, part of the water in the return pipe flows back to the auxiliary heat source for heating, and the water flow rate flowing into the air source heat pump module will be reduced (due to the input of the auxiliary heat source and the reduction in the amount of return water flowing into the air source heat pump module, the heating amount of the air source heat pump module can be reduced at this time, and the heating efficiency of the air source heat pump module can be optimized or the deterioration of the heating efficiency of the air source heat pump module can be slowed down). When the auxiliary heat source has been put into operation for a period of time and the air source heat pump module can provide more heat (such as the melting of frost attached to the outdoor heat exchanger of the air source heat pump module), if the heating supply of the air source heat pump module is not increased in time, and the auxiliary heat source is not reduced or part of the heating is 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] In order to solve the above problems, the present invention provides an air source heat pump type hot water heating device with an auxiliary heat source and a control method thereof.

[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 using module; the heat exchange module exchanges heat with the air source heat pump module, and the heat exchange module and the heat using module are connected through a circulating water circuit; the return water end of the heat exchange module is also connected to the auxiliary heat source of the circulating water circuit, and when the auxiliary heat source is turned on, the water flow output by the heat exchange module is auxiliary heated; the method comprises 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 to work in combination with the operation stage. Specifically, the operation stage includes an initial operation stage, a mid-operation stage, and a stable operation stage;

[0012] Initial operation includes any of the following:

[0013] When the machine is started for the first time and the operation time has not reached the first preset time ta, the auxiliary heat source module is controlled not to be put into operation;

[0014] When the indoor environment temperature is higher than the hot water temperature, the auxiliary heat source module is controlled to start operation; the indoor environment temperature is higher than the hot water temperature, which means that the actual indoor environment 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 controlled to start operation; the indoor ambient temperature is low, which means that the actual indoor ambient temperature of all heat-using devices 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 medium or the indoor ambient temperature is medium, the auxiliary heat source module is controlled to maintain the current operating state;

[0018] The medium hot water temperature means that the first hot water temperature Trs1 in the heat exchange module reaches the preset first hot water temperature judgment temperature Trsa but does not reach the preset second hot water temperature judgment temperature Trsb;

[0019] The medium indoor environment temperature means that the actual indoor environment temperature of any heat-using device in the heat-using module is higher than the first indoor environment temperature judgment temperature Tia, but does not reach the second indoor environment temperature judgment temperature Tib, and the value of Tia is smaller 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 is controlled to stop operating;

[0022] The hot water temperature is relatively high, which means that the first hot water temperature Trs1 in the heat exchange module reaches the preset second hot water temperature judgment temperature Trsb;

[0023] The indoor environment temperature is relatively high, which means that the actual temperature of the indoor environment of any heat-using device in the heat-using module is higher than the first judgment temperature Tib of the indoor environment 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, and if the hot water temperature difference is lower than a 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 operation modes when performing defrost operation: defrost operation and frost reducing operation; during defrost operation, the four-way reversing valve of the air source heat pump module switches to a cooling state; during frost reducing operation, the four-way reversing valve of the air source heat pump module maintains a heating state, and the refrigerant saturation pressure in the air-refrigerant heat exchanger in 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 frost reduction operation, the shut-off water valve in the auxiliary heat source module is in an open state and the auxiliary water pump is in an operating state; the operating frequency of the compressor in the air source heat pump module is reduced and the throttling degree of the throttling device is reduced.

[0027] Preferably, when the air source heat pump module operates alone, if the air source heat pump module has a defrost demand: if the indoor ambient temperature on the heat side is low, the auxiliary heat source module is controlled to start operation; if the indoor ambient temperature on the heat side is high, the auxiliary heat source module is not put into operation, and defrost operation is performed directly.

[0028] Preferably, if the indoor ambient temperature on the heat side is medium, the defrost operation or defrost operation mode is determined in combination with 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 controlled to start 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 controlled to start 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 defrost demand, the air source heat pump module operates normally, and the auxiliary heat source adjusts the heating load according to the current air source heat pump module water outlet temperature and the temperature difference between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is low and there is a defrost demand, the air source heat pump module operates in defrost mode, and the auxiliary heat source operates with maximum heating supply; if the indoor ambient temperature is high and there is no defrost demand, the auxiliary heat source adjusts the heating load according to the current air source heat pump module water outlet temperature and the temperature difference between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is high and there is a defrost demand, after reducing the heating load of the air source heat pump module and maintaining this operation for a period of time, if the unit still has a defrost demand, the air source heat pump module operates in defrost mode, and the auxiliary heat source operates with maximum heating supply.

[0031] The purpose of the present application is also to provide an air source heat pump hot water heating device with an auxiliary heat source, wherein the device is used to execute the control method of the air source heat pump hot water heating device with an auxiliary heat source as described in any of the above items.

[0032] Since the present application adopts the above-mentioned scheme, 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 when defrosting is in progress.

[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 more slowly) or the indoor ambient temperature on the heating side is low, the auxiliary heat source module can be controlled to start operating, thereby optimizing the use effect on the heating side.

[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 heating by the auxiliary heat source is small, or the indoor ambient temperature is high, thereby improving the economic efficiency of use. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0037] Figure 3 The present invention is a schematic diagram of the control logic of the air source heat pump hot water heating device with an auxiliary heat source. DETAILED DESCRIPTION

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

[0039] By detecting the outlet water temperature of the air source heat pump hot water heating device involved in the present invention or the outlet water temperature and the actual heat usage of the heat-using end, the input of the auxiliary heat source is controlled and adjusted.

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

[0041] The present invention divides the air source heat pump hot water heating device with auxiliary heat source into three operation stages: initial operation stage, mid-operation stage and stable operation stage.

[0042] 1. Initial operation:

[0043] 1) Initial operation definition: the initial startup stage, the indoor temperature is higher than the hot water temperature (the indoor temperature corresponding to at least one heat-using terminal is higher than the hot water outlet temperature), and the indoor temperature is low.

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

[0045] a. Initial startup stage (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 distortion of hot water temperature collection during the initial startup stage, thereby increasing 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. The indoor temperature is low (when 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-operation period:

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

[0050] 2) Operation status of auxiliary heat source module in the middle of operation:

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

[0052] b. The indoor ambient temperature is moderate (Ti1≤Tia and Ti2≤Tia are not satisfied and Ti1≥Tib and Ti2≥Tib are not satisfied): 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 high and indoor ambient temperature is high

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

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

[0057] b. 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 an auxiliary heat source involved in the present invention can execute different defrost operation control schemes according to whether the detected air source heat pump module needs to perform defrost operation and the current operation range of the hot water heating device.

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

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

[0061] a. When there is no defrosting demand: 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 operates in modular defrosting mode, and the auxiliary heat source is not put into heating operation (the use of water-side heat for defrosting will not have much impact on indoor comfort);

[0064] ② Medium indoor ambient temperature: When the outdoor ambient temperature is high, the auxiliary heat source is put into operation, and the air source heat pump module performs frost reduction operation (the indoor ambient temperature is not high, and the outdoor ambient temperature is high, so try not to enter defrost, and use frost reduction operation to maintain the heating effect. If the expected frost reduction effect is not achieved after a period of frost reduction operation, it will enter defrost operation); When the outdoor ambient temperature is low, the auxiliary heat source is put into heating operation, and the air source heat pump module performs frost operation (frost reduction operation cannot achieve defrost 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 medium: 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) Low indoor ambient temperature

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

[0072] b. When defrosting is required: the air source heat pump operates in modular defrosting mode, and the auxiliary heat source operates with maximum heating supply.

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

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

[0075] b. When 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 to defrost, the air source heat pump module will operate for defrosting, and the auxiliary heat source will operate at the maximum heating supply.

[0076] 3) When the auxiliary heat source is put into operation, the indoor ambient temperature is low. When the indoor ambient temperature is high after a period of operation, the operation is carried out according to 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 module 40, a water supply pipe 50, a return pipe 60 and a control mechanism 70.

[0078] The air source heat pump module 10 is composed 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] The compressor 11 is a variable speed compressor, which can compress low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant, and also provides power for the refrigerant to flow in the refrigeration pipeline.

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

[0081] The four-way reversing valve 13 can change the flow direction of the refrigerant inside the four-way reversing valve by switching the direction of the four-way reversing valve. Figure 1 Solid line in the middle four-way reversing valve) and refrigeration ( Figure 1 There are two operating states of the four-way reversing valve (dashed line inside).

[0082] The air-refrigerant heat exchanger 14 is capable of exchanging heat between the refrigerant flowing through the inside and the outdoor air flowing through the outside.

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

[0084] The throttling mechanism 16 may be an electronic expansion valve with adjustable flow rate (or other throttling mechanisms with adjustable flow rate).

[0085] The heat exchange module 20 is composed 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 therethrough and the water flowing therethrough.

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

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

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

[0091] The circulating water pump 23 can provide circulating power for the water inside the water system.

[0092] The auxiliary heat source module 30 involved in the present invention is composed of an auxiliary heat source 31 , an auxiliary circulating water pump 32 , a second outlet water temperature sensor 33 and a shutoff valve 34 .

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

[0094] The auxiliary circulating water pump 32 can provide circulating power for the water inside the water system.

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

[0096] like Figure 1 As shown, the shut-off stop valve 34 involved in the present invention has two states: open and closed. When the shut-off stop valve 34 is open, circulating water can pass through the inside thereof; when the shut-off stop valve 34 is closed, circulating water cannot pass through the inside thereof.

[0097] The heat-using module 40 is the terminal heat-using part. The present invention is described as the terminal heat-using part having two groups of heat exchangers (heat exchangers 41 and 42), wherein each group 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] The heat exchanger 41 and the heat exchanger 42 are capable of dissipating the heat carried by the water flowing through the heat exchanger 41 and the heat exchanger 42 into the indoor space.

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

[0100] The indoor environment temperature sensor (not shown) involved in the present invention can detect the environment temperature of the space where the heat exchanger 41 or the heat exchanger 42 is located.

[0101] The water supply pipe 50 is a passage through which hot water flows from the heat exchange module 20 or the auxiliary heat source module 30 to the heat using module 40 .

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

[0103] The control mechanism 70 can collect the operating status of each component in the air source heat pump module 10, the heat exchange module 20, the auxiliary heat source module 30, and the heat using module 40 and control the operating status of each component in the air source heat pump module 10, the heat exchange module 20, the auxiliary heat source module 30, and the heat using module 40.

[0104] like Figure 2 As shown, the control mechanism 70 involved in the present invention is composed 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 is capable of receiving operation parameter information set by the user.

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

[0107] The operation status control module 73 can obtain the operation status information of the air source heat pump type hot water supply device.

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

[0109] The hot water supply device in this embodiment has an air source heat pump module and an auxiliary heat source module. The air source heat pump module can operate alone or in conjunction with the auxiliary heat source module, and can provide sufficient heat when more heat is needed or defrosting operation is required. 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 heat-using side to rise slowly) or the indoor ambient temperature on the heat-using side is low, the auxiliary heat source module can be controlled to be put into operation, thereby optimizing the use effect of the heat-using side. After 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 heating 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 operation of the air source heat pump module, it is not judged whether the auxiliary heat source needs to be turned on; as the temperature of the hot water increases, the heating efficiency of the auxiliary heat source gradually decreases. The air source heat pump hot water supply device involved in the present invention can control the opening and closing of the auxiliary heat source according to the temperature difference of the hot water before and after being heated by the auxiliary heat source. If the temperature difference of the hot water before and after being heated by the auxiliary heat source is too small, the operation of the auxiliary heat source can be stopped to improve 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] The hot water supply device in this embodiment has two modes when performing defrosting operation on the outdoor heat exchanger of the heat pump module: defrosting operation and defrost operation; when performing defrosting operation, the four-way reversing valve is switched to the cooling state, and the heat pump module does not perform heating operation; when performing defrost operation, the four-way reversing valve maintains the heating state, the shut-off valve 34 is in the open state, the auxiliary water pump 32 is in the operating state, the operating frequency of the compressor is reduced, and the throttling degree of the throttling device is reduced (these two actions can increase the pressure on the low-pressure side of the refrigerant, reduce or stop the refrigerant from absorbing heat from the air-refrigerant heat exchanger), and the refrigerant saturation pressure in the air-refrigerant heat exchanger is increased to above the freezing point by reducing the water flow in the refrigerant-water heat exchanger (reducing the amount of heat absorbed by water from the refrigerant) and increasing the refrigerant pressure on the low-pressure side, thereby performing defrost operation on the air-refrigerant heat exchanger. When the air source heat pump module is operating alone, if the air source heat pump module has a defrosting demand: if the indoor air temperature on the heat-using side is low, the auxiliary heat source module can be controlled to start operation, which can improve the heating capacity and shorten the defrosting time, avoiding the impact of the defrosting period on the heat-using side; if the indoor air temperature on the heat-using side is high, the auxiliary heat source module will not be put into operation, and the defrosting operation will be carried out directly, avoiding the increase of energy consumption after the auxiliary heat source is put into operation. Figure 3 The control method is further explained.

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

[0113] 1) The hot water temperature at the end of floor radiant heating is generally 35-50°C, and the supply and return water temperature difference is generally designed to be no more than 10°C;

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

[0115] Since different types of heat-using terminals have different requirements on hot water temperature, the control method involved in the present invention is described as the heat-using terminal is floor radiation heating, and the hot water temperature of the floor radiation heating terminal is 40°C.

[0116] This embodiment is described assuming that the heat-using module 40 has two heat-using terminals.

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

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

[0119] S2: Set the first start-up operation mark K = 0, set the indoor ambient temperature mark A = 0, and then enter step S2;

[0120] S3: receiving the operation parameters set by the user, obtaining the first heat terminal indoor environment setting temperature Ts1, obtaining the first heat terminal indoor environment setting temperature Ts2, and then entering S4;

[0121] S4: The air source heat pump module operates normally, and then enters step S5;

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

[0123] S6: Count the operation time t1, and then go to step S7;

[0124] S7: Compare the statistical operation 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 first start-up operation mark symbol K=1, obtain the hot water temperature Trs1 detected by the first outlet water temperature sensor, and obtain the defrost state;

[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 second hot water temperature judgment temperature Trsb. If Trs1 ≥ Trsb, proceed to step S11; otherwise, proceed to step S14.

[0128] S11: Determine whether the value of the indoor environment temperature mark 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 enters step S13;

[0130] S13: judging whether the air source heat pump module has completed the defrosting operation, if defrosting is completed, proceeding to step S4, otherwise proceeding to step S12;

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

[0132] S15: judging whether the air source heat pump module has completed the defrosting operation, if defrosting is completed, proceeding to step S4, otherwise proceeding to step S14;

[0133] S16: Determine whether the value of the indoor environment temperature mark 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 the process proceeds to step S18;

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

[0136] S19: Compare the statistical frost reduction operation time t2 data with the preset time judgment threshold tb, if t2 ≥ tb, proceed to step S20, otherwise proceed to step S18;

[0137] S20: Set the counted frost reduction operation time t2 = 0, and restore the auxiliary heat source module to the state before entering the frost reduction operation, and then enter step S12;

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

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

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

[0141] S24: Set the indoor ambient temperature symbol A=0, put the auxiliary heat source into operation, and then enter step S4;

[0142] S25: Compare the obtained indoor environment actual temperature Ti1 of the first heat user terminal and the indoor environment actual temperature Ti2 of the second heat user terminal with the first judgment temperature Tia of the indoor environment temperature, and if Ti1≤Tia and Ti2≤Tia, proceed to step S24, otherwise proceed to step S26;

[0143] S26: Compare the obtained indoor environment actual temperature Ti1 of the first heat user terminal and the indoor environment actual temperature Ti2 of the second heat user terminal with the second judgment temperature Tib of the indoor environment temperature, and if Ti1≥Tib and Ti2≥Tib, proceed to step S27, otherwise proceed to step S29;

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

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

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

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

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

[0149] S32: Compare the obtained indoor environment actual temperature Ti1 of the first heat user terminal and the indoor environment actual temperature Ti2 of the second heat user terminal with the second judgment temperature Tib of the indoor environment temperature respectively. 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 the process goes to step S4;

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

[0152] S35: obtaining the hot water temperature Trs2 detected by the second outlet water temperature sensor, calculating the temperature difference ΔTrs 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 (ΔT rs = Trs2 - Trs1), and then proceeding 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 enters step S4;

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

[0156] Explanation of symbols:

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

[0158] Toa: outdoor ambient temperature judgment threshold, ℃, such as Toa preset to 5℃;

[0159] Ts1: The indoor environment setting temperature of the first heat-using terminal, °C;

[0160] Ts2: The second heat terminal indoor environment setting temperature, °C;

[0161] Ti1: Actual indoor temperature of the first heat-using terminal, °C;

[0162] Ti2: Actual indoor temperature of the second heat-using terminal, °C;

[0163] Tia: The first judgment temperature of indoor environment temperature, ℃, such as Tia is preset to 20℃;

[0164] Tib: The second judgment temperature of the indoor environment temperature, ℃, such as Tib is preset to 25℃;

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

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

[0167] Trsa: The first judgment temperature of hot water temperature, ℃, such as Trsa is preset to 25℃;

[0168] Trsb: The second judgment temperature of hot water temperature, °C, such as Trsb is preset to 35 °C;

[0169] Trsc: hot water temperature difference judgment temperature, ℃, such as Trsc preset to 5℃;

[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, °C;

[0171] t1: running time statistical parameter, min;

[0172] t2: Statistical parameter of defrosting operation time, min;

[0173] ta: operation time judgment threshold, such as ta is preset to 5 minutes;

[0174] tb: Defrost operation time judgment threshold, for example, tb is preset to 10 minutes;

[0175] K: initial startup mark, K=0 marks the initial startup, K=1 marks the non-initial startup (due to the large specific volume of water, the water temperature rises slowly in the water system, and the control methods of the initial startup and the non-initial startup are different, so this judgment is made here);

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

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

Claims

1. 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 using module; the heat exchange module exchanges heat with the air source heat pump module, and the heat exchange module and the heat using module are connected through a circulating water circuit; the return water end of the heat exchange module is also connected to the auxiliary heat source of the circulating water circuit, and when the auxiliary heat source is turned on, the water flow output by the heat exchange module is auxiliary heated; characterized in that The method comprises 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 to work in combination with the operation stage. Specifically, the operation stage includes an initial operation stage, a mid-operation stage, and a stable operation stage; Initial operation includes any of the following: When the machine is started for the first time and the operation time has not reached the first preset time ta, the auxiliary heat source module is controlled not to be put into operation; When the indoor environment temperature is higher than the hot water temperature, the auxiliary heat source module is controlled to start operation; the indoor environment temperature is higher than the hot water temperature, which means that the actual indoor environment temperature of any heat-using device in the heat-using module is higher than the first hot water temperature T rs1 ; When the indoor ambient temperature is low, the auxiliary heat source module is controlled to start operation; the indoor ambient temperature is low, which means that the actual indoor ambient temperature of all heat-using devices in the heat-using module is lower than the first judgment temperature T of the indoor ambient temperature. ia ; Mid-term operation includes: When the hot water temperature is medium or the indoor ambient temperature is medium, the auxiliary heat source module is controlled to maintain the current operating state; The medium hot water temperature refers to the first hot water temperature T in the heat exchange module. rs1 The hot water temperature reaches the preset first judgment temperature T rsa But the hot water temperature does not reach the preset second judgment temperature T rsb ; The indoor environment temperature is medium, which means that the actual indoor environment temperature of any heat-using device in the heat module is higher than the first judgment temperature T of the indoor environment temperature. ia , but the indoor environment temperature has not reached the second judgment temperature T ib ,T ia The value is less than T ib The value of The stable operation period includes: When the hot water temperature is high or the indoor ambient temperature is high, the auxiliary heat source module is controlled to stop operating; The hot water temperature is higher, which refers to the first hot water temperature T in the heat exchange module. rs1 The hot water temperature reaches the preset second judgment temperature T rsb The indoor environment temperature is high, which means that the actual temperature of the indoor environment of any heat-using device in the heat module is higher than the first judgment temperature T of the indoor environment temperature. ib .

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

3. The control method of the air source heat pump hot water heating device with auxiliary heat source according to claim 1, characterized in that: There are two operation modes when the outdoor heat exchanger of the air source heat pump module is defrosted: defrost operation and frost reduction operation. During the defrost operation, the four-way reversing valve of the air source heat pump module switches to the cooling state; during the frost reduction operation, the four-way reversing valve of the air source heat pump module maintains the heating state, and the refrigerant saturation pressure in the air-refrigerant heat exchanger in 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 of the air source heat pump hot water heating device with 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 frost reduction operation, the shut-off water valve in the auxiliary heat source module is in an open state and the auxiliary water pump is in an operating state; the operating frequency of the compressor in the air source heat pump module is reduced and the throttling degree of the throttling device is reduced.

5. The control method of the air source heat pump hot water heating device with auxiliary heat source according to claim 3, characterized in that: When the air source heat pump module operates alone, if the air source heat pump module has a defrosting demand: if the indoor ambient temperature on the heat side is low, the auxiliary heat source module is controlled to start operation; if the indoor ambient temperature on the heat side is high, the auxiliary heat source module is not put into operation and defrosting operation is performed directly.

6. The control method of the air source heat pump hot water heating device with auxiliary heat source according to claim 5, characterized in that: If the indoor ambient temperature on the heat side is medium, the defrost operation or defrost operation mode is determined in combination with the outdoor ambient temperature of the air source heat pump module. Specifically: When the outdoor ambient temperature is high, the auxiliary heat source module is controlled to start 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 controlled to start heating operation, and the air source heat pump module performs defrosting operation.

7. The control method of the air source heat pump hot water heating device with 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 defrost demand, the air source heat pump module operates normally, and the auxiliary heat source adjusts the heating load according to the current air source heat pump module outlet water temperature and the temperature difference between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is low and there is a defrost demand, the air source heat pump module operates in defrost mode, and the auxiliary heat source operates with maximum heating supply; if the indoor ambient temperature is high and there is no defrost demand, the auxiliary heat source adjusts the heating load according to the current air source heat pump module outlet water temperature and the temperature difference between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is high and there is a defrost demand, 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 defrost demand, the air source heat pump module operates in defrost mode, and the auxiliary heat source operates with maximum heating supply.

8. An air source heat pump hot water heating device with an auxiliary heat source, characterized in that: The device is used to execute the control method of the 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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