Heat pump hot water system with Internet transmission, diagnosis and management functions and control method thereof

Abstract

The present invention relates to a heat pump hot water system with Internet transmission, diagnosis and management functions and a control method thereof, comprising a compressor, a condenser, a throttle valve, an evaporator and a water storage tank; the characteristic is that the heat pump hot water system also includes a circulating water pump, a room heat exchanger, a system controller, a power-electricity meter, a WiFi module, a water storage tank temperature sensor, a room air temperature sensor and an outdoor environment temperature sensor. Its advantages are: the energy efficiency of the heat pump hot water system is improved by adopting a variable temperature water supply mode, and the energy saving of the heat pump operation is achieved; the actual energy saving effect of the variable temperature water supply operation mode can be monitored, and the heat pump operation parameters and energy saving effects can be uploaded to a third-party platform, which is convenient for energy hosting services and heat pump fault pre-diagnosis.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration energy saving of a heat pump hot water system, and in particular to a heat pump hot water system with Internet transmission, diagnosis and management functions and a control method thereof. Background Art

[0002] As a highly efficient and energy-saving hot water product, heat pump water heaters are increasingly being used in building heating. However, some problems have been encountered in their application. First, the operating energy cost of heat pump water heaters is higher than that of traditional coal-fired heating systems; second, heat pump water heaters have certain operating faults that affect user use. Therefore, heat pump operation energy saving and heat pump operation reliability have become technical issues that need to be urgently resolved in the heat pump hot water heating industry.

[0003] Analysis shows that the water supply method currently used by heat pump hot water systems is mostly constant temperature water supply, that is, no matter how the room cooling load changes, the water supply temperature of the heat pump hot water system is constant and is determined to meet the maximum design cooling load. For example, taking floor heating as an example, the water supply temperature is specified to be 45°C, but in fact, due to the large changes in the outdoor ambient temperature throughout the heating season and even every day, this directly causes the change in the room cooling load, which means that the water supply temperature of the heat pump hot water system should change with the room cooling load, that is, variable water temperature water supply. When the cooling load is small, the water supply temperature can be appropriately reduced, thereby achieving energy saving in heat pump operation. On the other hand, the use of third-party hosting services for heat pump hot water systems is also gradually emerging, mainly contract energy management and after-sales service hosting. This involves the problem that the operation data of the heat pump hot water system needs to be uploaded to a third-party platform, which requires the heat pump hot water system to have energy-saving technology and Internet-related technologies as support. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a heat pump hot water system and a control method thereof with Internet transmission, diagnosis and management functions, which can determine the optimal water supply temperature of the heat pump hot water system according to the outdoor ambient temperature and the room set temperature, and can automatically record the operating parameters of the heat pump hot water system and perform energy-saving effect comparison calculations, and upload these data to a third-party hosting platform through the device's built-in WiFi module.

[0005] In order to achieve the above-mentioned object, the technical solution of the heat pump hot water system with Internet transmission, diagnosis and management functions of the present invention is implemented as follows, which includes a compressor, a condenser, a throttle valve, an evaporator and a water tank; it is characterized in that it also includes a circulating water pump, a room heat exchanger, a system controller, a power-electricity meter, a WiFi module, a water tank temperature sensor, a room air temperature sensor and an outdoor environment temperature sensor;

[0006] The exhaust port of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the throttle valve, the outlet of the throttle valve is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the inlet of the compressor;

[0007] The water outlet of the water storage tank is connected to the inlet of the circulating water pump, the outlet of the circulating water pump is connected to the inlet of the room heat exchanger, and the outlet of the room heat exchanger is connected to the return water outlet of the water storage tank;

[0008] The power-electricity meter is installed at the main power input end of the heat pump hot water system, and the power-electricity meter, WiFi module, water tank temperature sensor, room air temperature sensor and outdoor environment temperature sensor are electrically connected to the system controller respectively.

[0009] In this technical solution, a control method for a heat pump hot water system with Internet transmission, diagnosis and management functions is characterized by:

[0010] The temperature sensed by the outdoor environment temperature sensor is the outdoor environment temperature Tw, the temperature sensed by the water tank temperature sensor is the actual water supply temperature Tgs, and the temperature sensed by the room air temperature sensor is the actual room temperature Tns;

[0011] The room set temperature T´ns is set in the system controller, and the system controller determines the required theoretical water supply temperature T´gs according to the room set temperature T´ns and the detected outdoor environment temperature Tw, and controls the start and stop of the compressor according to the comparison between the actual water supply temperature Tgs and the theoretical water supply temperature T´gs; when the actual water supply temperature Tgs>T´gs, the compressor stops running; when the actual water supply temperature Tgs≤T´gs, the compressor starts;

[0012] The system controller controls the start and stop of the circulating water pump by comparing the detected actual room temperature Tns with the room set temperature T´ns; when the actual room temperature Tns> the room set temperature T´ns, the circulating water pump stops running, and when the actual room temperature Tns≤ the room set temperature T´ns, the circulating water pump starts running;

[0013] The system controller obtains the actual operating power Ps of the heat pump variable temperature water supply, the cumulative power consumption Ws and the actual water supply temperature Tgs of the heat pump through the power-electricity meter. The system controller synchronously calculates the constant temperature operating power Ph and the constant temperature cumulative power consumption Wh of the heat pump in the constant temperature water supply mode according to the same heat generated under the variable temperature operation of the heat pump, and obtains the cumulative power saving of variable temperature water supply relative to constant temperature water supply.

[0014] ΔW;

[0015] The system controller uploads the acquired outdoor ambient temperature Tw, actual water supply temperature Tgs, actual room temperature Tns, room set temperature Tnd, compressor start and stop time, circulating water pump start and stop time, heat pump variable temperature water supply actual operating power Ps, cumulative power consumption Ws, heat pump constant temperature operating power Ph, constant temperature cumulative power consumption Wh and cumulative power saving ΔW to a third-party platform through a WiFi module for energy hosting services and heat pump fault pre-diagnosis.

[0016] In this technical solution, a control method for a heat pump hot water system with Internet transmission, diagnosis and management functions is characterized by:

[0017] The method for determining the required theoretical water supply temperature T´gs is: taking the outdoor ambient temperature as -15°C, the room set temperature as 20°C and the constant temperature water supply mode as 45°C as the design basis, the theoretical water supply temperature T´gs varies with the outdoor ambient temperature Tw and the room set temperature T´ns as T´gs=0.5(T´ns-Tw)+27.5.

[0018] In this technical solution, a control method for a heat pump hot water system with Internet transmission, diagnosis and management functions is characterized by:

[0019] When the actual water supply temperature Tgs of the constant temperature water supply mode is 45°C, the specific calculation method of the constant temperature operation power Ph, the constant temperature cumulative power consumption Wh and the cumulative power saving ΔW is as follows:

[0020] (a) Ph= Ps·[( 45-Tw) / 318] / [( Tgs-Tw) / (273+ Tgs)];

[0021] (b) Wh = ΣPh·Δt, Δt is the interval between Ph values, and Ph is the power data obtained by testing once within each interval Δt;

[0022] (c) ΔW = Wh-Ws.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] (1) By adopting variable temperature water supply mode, the energy efficiency of heat pump hot water system is improved, and energy saving of heat pump operation is achieved;

[0025] (2) It can monitor the actual energy-saving effect of the variable temperature water supply operation mode, and upload the heat pump operation parameters and energy-saving effect to a third-party platform to facilitate energy hosting services and heat pump fault pre-diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a heat pump hot water system implemented in the present invention. DETAILED DESCRIPTION

[0027] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the attached Figure 1 The following is shown in the attached Figure 1 The described embodiments are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] like Figure 1 As shown, the present invention is a heat pump hot water system with Internet transmission, diagnosis and management functions, including an evaporator 1, a compressor 2, a throttle valve 3, a condenser 4, a water tank 5, a circulating water pump 6, a room heat exchanger 7, a room air temperature sensor 8, a water tank temperature sensor 9, a system controller 10, a power-electricity meter 11, a WiFi module 12 and an outdoor environment temperature sensor 13.

[0029] The exhaust port of the compressor 2 is connected to the inlet of the condenser 4, the outlet of the condenser 4 is connected to the inlet of the throttle valve 3, the outlet of the throttle valve 3 is connected to the inlet of the evaporator 1, and the outlet of the evaporator 1 is connected to the inlet of the compressor 2. When the heat pump refrigeration system is running, the refrigerant gas discharged from the compressor 2 enters the condenser 4, and heats the water in the water storage tank 5 through the condenser 4. At the same time, the refrigerant in the condenser 4 is condensed into liquid and enters the evaporator 1 for evaporation after being throttled by the throttle valve 3, and then enters the compressor 2.

[0030] The water outlet of the water storage tank 5 is connected to the inlet of the circulating water pump 6, the outlet of the circulating water pump 6 is connected to the inlet of the room heat exchanger 7, and the outlet of the room heat exchanger 7 is connected to the water return port of the water storage tank 5. When the water supply system is running, hot water is pumped from the water storage tank 5 into the room heat exchanger 7 through the circulating water pump 6, exchanges heat with the room air through the room heat exchanger 7 and cools down, and then returns to the water storage tank 5.

[0031] The room air temperature sensor 8 , the water tank temperature sensor 9 , the system controller 10 , the power-electricity meter 11 , the WiFi module 12 and the outdoor environment temperature sensor 13 are electrically connected to the system controller 10 , respectively.

[0032] The power-electricity meter 11 is installed at the main power input end of the heat pump hot water system, and is used to measure the actual operating power Ps and the cumulative consumed electric energy Ws of the heat pump variable temperature water supply. The temperature sensed by the outdoor environment temperature sensor 13 is the outdoor environment temperature Tw, the temperature sensed by the water tank temperature sensor 9 is the actual water supply temperature Tgs, and the temperature sensed by the room air temperature sensor 8 is the actual room temperature Tns.

[0033] The room set temperature T´ns is set in the system controller 10. The system controller 10 determines the required theoretical water supply temperature T´gs according to the room set temperature T´ns and the detected outdoor ambient temperature Tw. The system controller 10 controls the start and stop of the compressor 2 according to the comparison between the actual water supply temperature Tgs and the theoretical water supply temperature T´gs. When the actual water supply temperature Tgs>T´gs, the compressor 2 stops running; when the actual water supply temperature Tgs≤T´gs, the compressor 2 starts.

[0034] In this embodiment, the method for determining the theoretical water supply temperature T´gs is: taking the outdoor ambient temperature as -15°C, the room set temperature as 20°C and the constant temperature water supply mode as 45°C as the design basis, the theoretical water supply temperature T´gs changes with the outdoor ambient temperature Tw and the room set temperature T´ns as T´gs=0.5(T´ns-Tw)+27.5.

[0035] The system controller 10 also controls the start and stop of the circulating water pump 6 by comparing the detected actual room temperature Tns with the room set temperature T´ns; when the actual room temperature Tns>the room set temperature T´ns, the circulating water pump 6 stops running, and when the actual room temperature Tns≤the room set temperature T´ns, the circulating water pump 6 starts running.

[0036] The system controller 10 also obtains the actual operating power Ps of the heat pump variable temperature water supply, the cumulative power consumption Ws and the actual water supply temperature Tgs of the heat pump through the power-power meter 11. The system controller 10 synchronously calculates the constant temperature operating power Ph and the constant temperature cumulative power consumption Wh of the heat pump in the constant temperature water supply mode according to the same heat generated under the variable temperature operation of the heat pump, and obtains the cumulative power saving ΔW of the variable temperature water supply relative to the constant temperature water supply. In this embodiment, the actual water supply temperature Tgs of the constant temperature water supply mode is 45°C, and the specific calculation method of the constant temperature operating power Ph, the constant temperature cumulative power consumption Wh and the cumulative power saving ΔW is as follows:

[0037] Ph= Ps·[( 45-Tw) / 318] / [( Tgs-Tw) / (273+ Tgs)];

[0038] (2) Wh = ΣPh·Δt, Δt is the interval between Ph value acquisition. In this implementation case, Δt is 10s, and Ph is the power data obtained by detecting once every 10s.

[0039] (3) ΔW = Wh-Ws.

[0040] The system controller 10 uploads the acquired outdoor ambient temperature Tw, actual water supply temperature Tgs, actual room temperature Tns, room set temperature Tnd, compressor 2 start and stop time, circulating water pump 6 start and stop time, heat pump variable temperature water supply actual operating instantaneous power Ps, cumulative power consumption Ws, heat pump constant temperature water supply calculated instantaneous power Ph, cumulative power consumption Wh and variable temperature water supply cumulative power saving ΔW to a third-party platform through the WiFi module 12 for energy hosting services and heat pump fault pre-diagnosis.

[0041] In this embodiment, the temperature unit is ° C. The system controller 10, the power-electricity meter 11 and the WiFi module 12 are all existing technologies and will not be described in detail.

[0042] 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 limited by the claims and their equivalents.

Claims

1. A control method for a heat pump hot water system with Internet transmission, diagnosis and management functions, the heat pump hot water system comprising a compressor (2), a condenser (4), a throttle valve (3), an evaporator (1) and a water storage tank (5), a circulating water pump (6), a room heat exchanger (7), a system controller (10), a power-electricity meter (11), a WiFi module (12), a water storage tank temperature sensor (9), a room air temperature sensor (8) and an outdoor environment temperature sensor (13); The exhaust port of the compressor (2) is connected to the inlet of the condenser (4), the outlet of the condenser (4) is connected to the inlet of the throttle valve (3), the outlet of the throttle valve (3) is connected to the inlet of the evaporator (1), and the outlet of the evaporator (1) is connected to the inlet of the compressor (2); The water outlet of the water storage tank (5) is connected to the inlet of the circulating water pump (6), the outlet of the circulating water pump (6) is connected to the inlet of the room heat exchanger (7), and the outlet of the room heat exchanger (7) is connected to the return water outlet of the water storage tank (5); The power-electricity meter (11) is installed at the main power input end of the heat pump hot water system, and the power-electricity meter (11), the WiFi module (12), the water tank temperature sensor (9), the room air temperature sensor (8) and the outdoor environment temperature sensor (13) are respectively electrically connected to the system controller (10); characterized in that The control method is as follows: The temperature sensed by the outdoor environment temperature sensor (13) is the outdoor environment temperature Tw, the temperature sensed by the water tank temperature sensor (9) is the actual water supply temperature Tgs, and the temperature sensed by the room air temperature sensor (8) is the actual room temperature Tns; A room set temperature T´ns is set in the system controller (10), and the system controller (10) determines a required theoretical water supply temperature T´gs according to the room set temperature T´ns and the detected outdoor ambient temperature Tw, and controls the start and stop of the compressor (2) according to a comparison between the actual water supply temperature Tgs and the theoretical water supply temperature T´gs; when the actual water supply temperature Tgs>T´gs, the compressor (2) stops running; when the actual water supply temperature Tgs≤T´gs, the compressor (2) starts; The system controller (10) controls the start and stop of the circulating water pump (6) by comparing the detected actual room temperature Tns with the room set temperature T´ns; when the actual room temperature Tns> the room set temperature T´ns, the circulating water pump (6) stops running; when the actual room temperature Tns≤ the room set temperature T´ns, the circulating water pump (6) starts running; The system controller (10) obtains the actual operating power Ps of the heat pump variable temperature water supply, the accumulated power consumption Ws and the actual water supply temperature Tgs of the heat pump through the power-power meter (11). The system controller (10) synchronously calculates the constant temperature operating power Ph and the accumulated power consumption Wh of the heat pump in the constant temperature water supply mode according to the same amount of heat generated by the heat pump in the variable temperature operation, and obtains the accumulated power saving ΔW of the variable temperature water supply relative to the constant temperature water supply; The system controller (10) uploads the acquired data of outdoor ambient temperature Tw, actual water supply temperature Tgs, actual room temperature Tns, set room temperature Tnd, compressor (2) start / stop time, circulating water pump (6) start / stop time, heat pump variable temperature water supply actual operating power Ps, accumulated power consumption Ws, heat pump constant temperature operating power Ph, accumulated power consumption Wh at constant temperature and accumulated power saving ΔW to a third-party platform via a WiFi module (12) for use in energy hosting services and heat pump fault pre-diagnosis.

2. The control method of the heat pump hot water system with Internet transmission, diagnosis and management functions according to claim 1, characterized in that: The required theoretical water supply temperature T´gs is determined by setting the outdoor ambient temperature to -15°C, the room set temperature to 20°C and the constant temperature water supply mode to 45°C as the design basis. The theoretical water supply temperature T´gs varies with the outdoor ambient temperature Tw and the room set temperature T´ns as T´gs=0.5(T´ns-Tw)+27.

5.

3. The control method of the heat pump hot water system with Internet transmission, diagnosis and management functions according to claim 1, characterized in that: When the actual water supply temperature Tgs of the constant temperature water supply mode is 45°C, the specific calculation method of the constant temperature operation power Ph, the constant temperature cumulative power consumption Wh and the cumulative power saving ΔW is as follows: (a) Ph= Ps·[( 45-Tw) / 318] / [( Tgs-Tw) / (273+ Tgs)]; (b) Wh = ΣPh·Δt, where Δt is 10s and Ph is the power data obtained by testing once every 10s; (c) ΔW = Wh-Ws.

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