CN-121163127-B - Composite energy-saving control method based on ultralow temperature heat pump and related equipment

CN121163127BCN 121163127 BCN121163127 BCN 121163127BCN-121163127-B

Abstract

The application relates to the technical field of heat pump control, in particular to a composite energy-saving control method based on an ultralow-temperature heat pump and related equipment. The ultralow temperature heat pump comprises an air injection enthalpy-increasing compressor, a four-way valve, a coil pipe temperature sensor, an outdoor temperature sensor, a first plate exchange unit and a second plate exchange unit, wherein the first plate exchange unit comprises a plate exchange and a buffer water tank, a water inlet pipe connected with the buffer water tank is provided with a water inlet temperature sensor, a water outlet pipe connected with the buffer water tank is provided with a water outlet temperature sensor, and an electric heater is arranged in the buffer water tank. The application can effectively improve the heating effect, reduce the starting time in the ultralow temperature cold starting process, adapt to the dynamic load demand and reduce the system vibration risk.

Inventors

FANG JINZHI
XIAO WEI
CHEN YUNJIE
YANG FANGPU
ZHU HAOJUN
Gao Zuwei
YIN XU
LIANG SHAOWEI

Assignees

广东纽恩泰新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251024

Claims (3)

1. The method is characterized in that the ultralow temperature heat pump comprises an air injection enthalpy-increasing compressor, a four-way valve, a coil pipe temperature sensor, an outdoor temperature sensor, a first plate exchange unit and a second plate exchange unit, wherein the four-way valve is respectively connected with the air injection enthalpy-increasing compressor, the coil pipe temperature sensor and the first plate exchange unit, the second plate exchange unit is respectively connected with the air injection enthalpy-increasing compressor, the coil pipe temperature sensor and the first plate exchange unit, the first plate exchange unit comprises a plate exchange buffer water tank, a water inlet pipe connected with the buffer water tank by the plate exchange is provided with a water inlet temperature sensor, a water outlet pipe connected with the buffer water tank by the plate exchange is provided with a water outlet temperature sensor, and an electric heater is arranged in the buffer water tank, and the method comprises the following steps: acquiring outdoor temperature in real time through the outdoor temperature sensor; When the outdoor temperature is greater than or equal to a first temperature threshold, controlling the jet enthalpy-increasing compressor to perform variable frequency operation, when the outdoor temperature is less than the first temperature threshold and greater than a second temperature threshold, controlling the jet enthalpy-increasing compressor to perform variable frequency operation, and simultaneously dynamically adjusting the heating power of the electric heater in the buffer water tank to perform electric heating; When the outdoor temperature is smaller than the second temperature threshold, controlling the power of the electric heater in the buffer water tank to perform full-load operation, and simultaneously dynamically controlling the operation frequency of the jet enthalpy-increasing compressor, wherein the method comprises the following steps of: when the electric heater runs at full load and the temperature change speed detected by the water inlet temperature sensor is greater than or equal to a first temperature speed threshold value and less than a second temperature speed threshold value, controlling the jet enthalpy-increasing compressor to start running; When the electric heater runs at full load and the temperature change speed detected by the water inlet temperature sensor is smaller than the first temperature speed threshold value, and the duration exceeds a first time threshold value, controlling the jet enthalpy-increasing compressor to start running and notifying the electric heater of abnormality; when the jet enthalpy-increasing compressor is started to operate, the operation frequency control comprises high-speed frequency-increasing control, medium-speed frequency-increasing control, low-speed frequency-increasing control or frequency stability control; When the temperature change speed detected by the water inlet temperature sensor is greater than or equal to a first temperature speed threshold and less than a third temperature speed threshold, and meanwhile, the temperature detected by the water inlet temperature sensor is less than the third temperature threshold and the duration exceeds a second time threshold, and the operating frequency of the jet enthalpy increasing compressor is lower than a first frequency threshold, determining that the operating frequency is controlled to be the high-speed frequency increasing control, and controlling the jet enthalpy increasing compressor to increase a first target frequency threshold according to the frequency increasing rate, wherein the frequency increasing rate is the frequency increasing rate threshold; When the temperature change speed detected by the water inlet temperature sensor is greater than or equal to the third temperature speed threshold and less than the second temperature speed threshold, and meanwhile, the temperature detected by the water inlet temperature sensor is less than the third temperature threshold and the duration exceeds the second time threshold, and the operating frequency of the jet enthalpy-increasing compressor is less than a second frequency threshold, determining that the operating frequency is controlled to be the medium-speed frequency-increasing control, and controlling the jet enthalpy-increasing compressor to increase a second target frequency threshold according to the frequency-increasing speed threshold; When the temperature change speed detected by the water inlet temperature sensor is greater than or equal to the second temperature speed threshold and less than a fourth temperature speed threshold, and meanwhile, the temperature detected by the water inlet temperature sensor is less than the third temperature threshold and the duration exceeds the second time threshold, and the operating frequency of the jet enthalpy increasing compressor is less than a third frequency threshold, determining that the operating frequency is controlled to be the low-speed frequency-increasing control, and controlling the jet enthalpy increasing compressor to increase a third target frequency threshold according to the frequency-increasing speed threshold; when the temperature change speed detected by the water inlet temperature sensor is greater than or equal to the fourth temperature speed threshold and less than a fifth temperature speed threshold, and the temperature detected by the water inlet temperature sensor is greater than or equal to the third temperature threshold and the duration exceeds the second time threshold, and the operating frequency of the enhanced vapor injection compressor is less than a fourth frequency threshold, determining that the operating frequency is controlled to be the frequency stable control, and controlling the frequency of the enhanced vapor injection compressor to be kept unchanged; And when the operation frequency control does not belong to the high-speed frequency-increasing control, the medium-speed frequency-increasing control, the low-speed frequency-increasing control or the frequency stability control, controlling the frequency of the jet enthalpy-increasing compressor to be controlled at a target stability frequency threshold.
2. The device for the composite energy-saving control based on the ultralow temperature heat pump is characterized in that the ultralow temperature heat pump comprises an air injection enthalpy-increasing compressor, a four-way valve, a coil pipe temperature sensor, an outdoor temperature sensor, a first plate exchange unit and a second plate exchange unit, wherein the four-way valve is respectively connected with the air injection enthalpy-increasing compressor, the coil pipe temperature sensor and the first plate exchange unit, the second plate exchange unit is respectively connected with the air injection enthalpy-increasing compressor, the coil pipe temperature sensor and the first plate exchange unit, the first plate exchange unit comprises a plate exchange buffer water tank, a water inlet pipe connected with the buffer water tank is provided with a water inlet temperature sensor, a water outlet pipe connected with the buffer water tank is provided with a water outlet temperature sensor, and an electric heater is arranged in the buffer water tank, and the device comprises: the data acquisition module is used for acquiring the outdoor temperature in real time through the outdoor temperature sensor; the system comprises an outdoor temperature, a grading control module, a full load operation control module and a control module, wherein the outdoor temperature is greater than or equal to a first temperature threshold value, the grading control module is used for controlling the jet enthalpy increasing compressor to perform variable frequency operation when the outdoor temperature is less than the first temperature threshold value and greater than a second temperature threshold value, controlling the jet enthalpy increasing compressor to perform variable frequency operation while dynamically adjusting the heating power of the electric heater in the buffer water tank to perform electric heating, and controlling the power of the electric heater in the buffer water tank to perform full load operation while dynamically controlling the operation frequency of the jet enthalpy increasing compressor when the outdoor temperature is less than the second temperature threshold value; When the outdoor temperature is smaller than the second temperature threshold, controlling the power of the electric heater in the buffer water tank to perform full-load operation, and simultaneously dynamically controlling the operation frequency of the jet enthalpy-increasing compressor, wherein the method comprises the following steps of: when the electric heater runs at full load and the temperature change speed detected by the water inlet temperature sensor is greater than or equal to a first temperature speed threshold value and less than a second temperature speed threshold value, controlling the jet enthalpy-increasing compressor to start running; When the electric heater runs at full load and the temperature change speed detected by the water inlet temperature sensor is smaller than the first temperature speed threshold value, and the duration exceeds a first time threshold value, controlling the jet enthalpy-increasing compressor to start running and notifying the electric heater of abnormality; when the jet enthalpy-increasing compressor is started to operate, the operation frequency control comprises high-speed frequency-increasing control, medium-speed frequency-increasing control, low-speed frequency-increasing control or frequency stability control; When the temperature change speed detected by the water inlet temperature sensor is greater than or equal to a first temperature speed threshold and less than a third temperature speed threshold, and meanwhile, the temperature detected by the water inlet temperature sensor is less than the third temperature threshold and the duration exceeds a second time threshold, and the operating frequency of the jet enthalpy increasing compressor is lower than a first frequency threshold, determining that the operating frequency is controlled to be the high-speed frequency increasing control, and controlling the jet enthalpy increasing compressor to increase a first target frequency threshold according to the frequency increasing rate, wherein the frequency increasing rate is the frequency increasing rate threshold; When the temperature change speed detected by the water inlet temperature sensor is greater than or equal to the third temperature speed threshold and less than the second temperature speed threshold, and meanwhile, the temperature detected by the water inlet temperature sensor is less than the third temperature threshold and the duration exceeds the second time threshold, and the operating frequency of the jet enthalpy-increasing compressor is less than a second frequency threshold, determining that the operating frequency is controlled to be the medium-speed frequency-increasing control, and controlling the jet enthalpy-increasing compressor to increase a second target frequency threshold according to the frequency-increasing speed threshold; When the temperature change speed detected by the water inlet temperature sensor is greater than or equal to the second temperature speed threshold and less than a fourth temperature speed threshold, and meanwhile, the temperature detected by the water inlet temperature sensor is less than the third temperature threshold and the duration exceeds the second time threshold, and the operating frequency of the jet enthalpy increasing compressor is less than a third frequency threshold, determining that the operating frequency is controlled to be the low-speed frequency-increasing control, and controlling the jet enthalpy increasing compressor to increase a third target frequency threshold according to the frequency-increasing speed threshold; when the temperature change speed detected by the water inlet temperature sensor is greater than or equal to the fourth temperature speed threshold and less than a fifth temperature speed threshold, and the temperature detected by the water inlet temperature sensor is greater than or equal to the third temperature threshold and the duration exceeds the second time threshold, and the operating frequency of the enhanced vapor injection compressor is less than a fourth frequency threshold, determining that the operating frequency is controlled to be the frequency stable control, and controlling the frequency of the enhanced vapor injection compressor to be kept unchanged; And when the operation frequency control does not belong to the high-speed frequency-increasing control, the medium-speed frequency-increasing control, the low-speed frequency-increasing control or the frequency stability control, controlling the frequency of the jet enthalpy-increasing compressor to be controlled at a target stability frequency threshold.
3. An electronic device comprising a memory storing a computer program and a processor that when executing the computer program implements the method of claim 1.

Description

Composite energy-saving control method based on ultralow temperature heat pump and related equipment Technical Field The application relates to the technical field of heat pump control, in particular to a composite energy-saving control method based on an ultralow-temperature heat pump and related equipment. Background With the continuous improvement of the living standard of people, the requirements of users on products are increasingly improved, and meanwhile, the problem that the traditional air energy heat pump is exposed when operating in a low-temperature environment is also increasingly remarkable. Specifically, when the ambient temperature drops to-10 ℃ and lower, the evaporation capacity of the traditional air energy heat pump is greatly reduced due to the fact that the evaporation temperature is too low, and then the air return capacity of the compressor is insufficient, the problem directly affects the normal heat release of the condenser, the heating effect of the heat pump is obviously reduced, even the condition that normal operation cannot be performed occurs in an extremely ultralow temperature environment, and the actual requirement of people on stable heating is difficult to meet. Although the heat release of a condenser is improved to a certain extent by adding an air injection enthalpy-increasing technology to the existing part of ultralow temperature heat pump, in an extremely ultralow temperature environment, the high-efficiency energy-saving heating requirement is still difficult to achieve by only relying on the air injection enthalpy-increasing technology, and a plurality of technical short plates exist in the ultralow temperature heat pump, namely, firstly, the problem of cold start heating delay in the ultralow temperature environment cannot be solved by adopting a single frequency control mode and the stability of the heating effect cannot be fully ensured by only adjusting the frequency of a compressor; secondly, the electric heating system lacks a reasonable cascading strategy, is controlled to start and stop by only depending on a fixed temperature threshold value, cannot be flexibly adapted according to dynamically-changed load demands, and is low in energy utilization efficiency, thirdly, the system vibration risk exists, and as the compressor frequently performs frequency-up and frequency-down operation and electric heating on-off control, the conflict is easy to occur, the refrigerant pressure is easy to be greatly fluctuated, and the stability and reliability of the operation of the whole heat pump system are affected. In summary, the technical problems in the related art are to be improved. Disclosure of Invention The embodiment of the application mainly aims to provide a composite energy-saving control method and related equipment based on an ultralow temperature heat pump, which can effectively improve heating effect, reduce starting time in the ultralow temperature cold starting process, adapt to dynamic load requirements and reduce system oscillation risk. In order to achieve the above object, an aspect of the present application provides a method for composite energy-saving control based on an ultralow temperature heat pump, where the ultralow temperature heat pump includes an enhanced vapor injection compressor, a four-way valve, a coil temperature sensor, an outdoor temperature sensor, a first plate exchange unit and a second plate exchange unit, the four-way valve is connected with the enhanced vapor injection compressor, the coil temperature sensor and the first plate exchange unit, the second plate exchange unit is connected with the enhanced vapor injection compressor, the coil temperature sensor and the first plate exchange unit, the first plate exchange unit includes a plate exchange buffer tank, a water inlet pipe connected with the buffer tank is provided with a water inlet temperature sensor, a water outlet pipe connected with the buffer tank is provided with a water outlet temperature sensor, and an electric heater is provided in the buffer tank, and the method includes the following steps: acquiring outdoor temperature in real time through the outdoor temperature sensor; In the process of performing jet enthalpy increase by the second plate exchange unit, performing mode classification according to the outdoor temperature to obtain a heating mode; wherein the step control comprises dynamically controlling the operation frequency of the jet enthalpy-increasing compressor or dynamically adjusting the heating power of the electric heater in the buffer water tank to perform electric heating. In some embodiments, in the process of performing vapor injection enthalpy increase by the second plate exchanging unit, performing mode classification according to the outdoor temperature to obtain a heating mode, and performing classification control according to the heating mode, wherein the method comprises the following steps: When the outdoor temperature is greate