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CN-122015368-A - Control method for cooling and simultaneously accumulating cold of refrigerant circulating system, refrigerant circulating system and air conditioning unit

CN122015368ACN 122015368 ACN122015368 ACN 122015368ACN-122015368-A

Abstract

The invention discloses a control method for simultaneously cooling and accumulating cold of a refrigerant circulating system and the refrigerant circulating system, wherein the control method comprises the following steps of a, obtaining a refrigeration target evaporation temperature T1 of an indoor unit and a target cold accumulation temperature T2 of a cold accumulation device; the method comprises the steps of b1, obtaining the current temperature T0 of a cold accumulation medium, calculating the difference value T of T0-T1, determining the refrigeration calculation target evaporation temperature Ta of the indoor unit and the cold accumulation calculation target temperature Tb of the cold accumulation device according to T, determining the refrigeration capacity requirement Q1 required by the indoor unit, determining the refrigeration capacity requirement Q2 of the cold accumulation device, calculating the sum Qtotal of the Q1 and the Q2, adjusting the working state of a compressor unit according to the Qtotal, judging whether T0 reaches T2 or not, and repeating the step b1 if not. The invention discloses an energy-saving method of a control method, and an applied refrigerant circulation system relates to an energy-saving heat exchange device and plays a role in energy saving.

Inventors

  • ZHANG SHIQIANG
  • CHEN MIN
  • LI LIMIN

Assignees

  • 珠海格力电器股份有限公司

Dates

Publication Date
20260512
Application Date
20260401

Claims (11)

  1. 1. The control method for simultaneously cooling and accumulating cold of the refrigerant circulation system is characterized in that the refrigerant circulation system comprises a condenser (108), a compressor unit, an indoor unit (2) and a cold accumulation device (310) which are arranged between the condenser (108) and the compressor unit, wherein the cold accumulation device (310) is used for absorbing and storing the cold of a refrigerant passing through the cold accumulation device, the compressor unit comprises a first compressor (105) and a second compressor (106), the working mode of the compressor unit comprises a single-machine working mode of one compressor and a multi-machine working mode of a plurality of compressors, and the control method for simultaneously cooling and accumulating cold comprises the following steps: A, responding to the temperature setting of a user, obtaining a refrigeration target evaporation temperature T1 of an indoor unit (2) and a target cold storage temperature T2 of a cold storage device (310); step b of adjusting the compressor group to bring the evaporation temperature of the indoor unit (2) to T1 and the temperature of the cold storage medium of the cold storage device (310) to T2, comprising: Step b1, obtaining the current temperature T0 of a cold accumulation medium, calculating the difference T between T0 and T1, determining the refrigeration calculation target evaporation temperature Ta of the indoor unit (2) and the cold accumulation calculation target temperature Tb of the cold accumulation device (310) according to T, determining the refrigeration capacity requirement Q1 of the indoor unit (2) according to Ta and the refrigeration capacity requirement Q2 of the cold accumulation device (310) according to T0 and Tb, calculating the sum Qtotal of Q1 and Q2, and adjusting the working state of the compressor unit according to whether Q always falls into a high-energy-efficiency interval of a single-machine working mode of the compressor unit and whether falls into a high-energy-efficiency interval of a multi-machine working mode; and b2, judging whether T0 reaches T2, and if not, repeating the step b1.
  2. 2. The method for simultaneously cooling and storing cold in a refrigerant cycle system according to claim 1, wherein said step b1 includes using a target evaporation temperature T1 for cooling as a target evaporation temperature Ta for cooling calculation of the indoor unit (2) and a target temperature Tb for storing cold of the cold storage device (310) when T is greater than a first threshold T1.
  3. 3. The method for controlling simultaneous cooling and cold storage of a refrigerant cycle system as set forth in claim 1, wherein said step b1 includes taking a target cold storage temperature T2 as a cold storage calculation target temperature Tb of a cold storage device (310) and taking T3 as a cooling calculation target evaporation temperature Ta of an indoor unit (2) when T is smaller than a first threshold T1 and T0 is larger than T2, T3 being calculated by the following formula T3=T1-k (T1-T2), wherein k is an adjustment coefficient and k is larger than 0 and smaller than 1.
  4. 4. The method for controlling simultaneous cooling and cold storage of a refrigerant cycle system as set forth in claim 3, wherein said step b1 further comprises closing said connection between said cold storage device (310) and said condenser (108) and said compressor unit when the current temperature T0 of the cold storage medium reaches T2, and taking the target evaporation temperature T1 of cooling as the target evaporation temperature Ta of cooling calculation of the indoor unit (2).
  5. 5. The method for simultaneously cooling and cooling a refrigerant cycle system according to claim 1, wherein said step b1 comprises determining a cooling capacity requirement Q2 of the cold storage device (310) based on T0 and Tb in combination with a specific heat capacity, a mass and a preset change time of a cold storage medium of the cold storage device (310).
  6. 6. The method for controlling simultaneous cooling and cold storage of a refrigerant cycle system according to claim 1, wherein the energy efficient section of the first compressor (105) is (Qx 1, qx 2), the energy efficient section of the second compressor (106) is (Qy 1, qy 2), the single machine operation mode includes a first compressor operation mode and a second compressor operation mode, the multiple machine operation mode includes a first compressor and a second compressor common operation mode, in the first and second compressor common operation modes, the inlets of the first and second compressors (105, 106) are communicated, the refrigerant outputted from the indoor unit (2) and the refrigerant outputted after heat exchange with the cold storage device (310) are combined, and then the refrigerant is fed into the inlets of the first and second compressors (105, 106), the step b1 includes adjusting the operation mode of the compressor unit to the first compressor and the second compressor operation mode when Qx1< Qx2, and the Qy1< Qy < Qx2 > when Qy1< Qx2 and Qy1< Qy 2+qx 2 are adjusted when Qy1< Qx 2.
  7. 7. The method for controlling simultaneous cooling and cold storage of a refrigerant cycle system as set forth in claim 6, wherein said multiple operation modes further include a first compressor and a second compressor independent operation mode, wherein in said first compressor and said second compressor independent operation mode, inlets of said first compressor (105) and said second compressor (106) are not connected, and wherein said refrigerant outputted from said indoor unit (2) and said refrigerant outputted after heat exchange with said cold storage device (310) are not joined, and are independently fed into said inlet of said first compressor (105) and said inlet of said second compressor (106), respectively, said step b1 includes adjusting the operation mode of the compressor unit to said first compressor and said second compressor independent operation mode when three inequalities of Qx1< Qx2, qy1< Qy2, (qx1+qy1) < qtotal < (qx2+qy2) are not satisfied.
  8. 8. A refrigerant circulation system, characterized in that the control method for simultaneously cooling and accumulating cold according to any one of claims 1-7 is applied, and comprises a condenser (108), a compressor unit, an indoor unit (2) and a cold accumulating device (310) which are arranged between the condenser (108) and the compressor unit, wherein the cold accumulating device (310) is used for absorbing and storing the cooling capacity of the refrigerant passing through the cold accumulating device, the compressor unit comprises a first compressor (105) and a second compressor (106), and the working mode of the compressor unit comprises a single-machine working mode of one compressor and a multi-machine working mode of a plurality of compressors.
  9. 9. The refrigerant cycle system as recited in claim 8, wherein said multiple compressor operation mode includes a first compressor and a second compressor operation mode in which inlets of said first compressor (105) and said second compressor (106) are communicated, and refrigerant outputted from said indoor unit (2) and refrigerant outputted after heat exchange with said cold storage device (310) are merged and then fed into inlets of said first compressor (105) and said second compressor (106).
  10. 10. The refrigerant cycle system as set forth in claim 8, wherein said multiple-compressor operation mode includes a first compressor and a second compressor independent operation mode in which inlets of said first compressor (105) and said second compressor (106) are not communicated, and refrigerant outputted from said indoor unit (2) and refrigerant outputted after heat exchange with said cold storage device (310) are not joined and are independently fed into said inlet of said first compressor (105) and said inlet of said second compressor (106), respectively.
  11. 11. An air conditioning unit comprising the refrigerant circulation system of any one of claims 8 to 10.

Description

Control method for cooling and simultaneously accumulating cold of refrigerant circulating system, refrigerant circulating system and air conditioning unit Technical Field The invention relates to the technical field of air conditioners, in particular to a control method for simultaneously refrigerating and accumulating cold of a refrigerant circulating system, the refrigerant circulating system and an air conditioning unit. Background At present, most areas in China already adopt peak-to-valley electricity price policies, different electricity price standards are executed according to different electricity consumption periods, users are encouraged to stagger peak electricity consumption, and peak pressure of a power grid is relieved. But for the conventional air conditioning system, there is no function of transferring the valley electricity amount to the peak electricity rate period. Therefore, it is necessary to introduce an energy storage device to effect transfer of the electric quantity. After the energy storage equipment is additionally arranged, when the cold accumulation of the energy storage equipment and the cold supply requirement of the tail end of the air conditioner are simultaneously started, if the cold supply of the tail end of the indoor unit is required to be stopped when the cold accumulation is carried out in the period of low electricity consumption in order to ensure the cold accumulation effect, the refrigerating effect on the environment is sacrificed, and if the refrigerating effect on the environment is not influenced, the cold accumulation effect is difficult to ensure. Disclosure of Invention The invention aims to provide a control method for cooling and simultaneously accumulating cold of a high-efficiency refrigerant circulation system and the refrigerant circulation system applying the method. The invention discloses a control method for simultaneously cooling and accumulating cold of a refrigerant circulating system, which comprises a condenser, a compressor unit, an indoor unit and a cold accumulating device, wherein the indoor unit and the cold accumulating device are arranged between the condenser and the compressor unit, the cold accumulating device is used for absorbing and storing the cold of a refrigerant passing through the cold accumulating device, the compressor unit comprises a first compressor and a second compressor, the working mode of the compressor unit comprises a single-machine working mode in which one compressor works and a multi-machine working mode in which a plurality of compressors work, and the control method for simultaneously cooling and accumulating cold comprises the following steps: step a, responding to the temperature setting of a user, obtaining a refrigeration target evaporation temperature T1 of an indoor unit and a target cold storage temperature T2 of a cold storage device; step b of adjusting the compressor group to make the evaporation temperature of the indoor unit reach T1 and the temperature of the cold storage medium of the cold storage device reach T2, comprising: Step b1, obtaining the current temperature T0 of a cold storage medium, calculating the difference value T of T0-T1, determining the refrigeration calculation target evaporation temperature Ta of an indoor unit and the cold storage calculation target temperature Tb of a cold storage device according to T, determining the refrigeration capacity requirement Q1 required by the indoor unit according to Ta, and determining the refrigeration capacity requirement Q2 of the cold storage device according to T0 and Tb, calculating the sum Qtotal of Q1 and Q2, and adjusting the working state of the compressor unit according to whether Q always falls into a high-energy-efficiency interval of a single-machine working mode of the compressor unit and whether Q falls into a high-energy-efficiency interval of a multi-machine working mode; and b2, judging whether T0 reaches T2, and if not, repeating the step b1. In some embodiments, the step b1 includes taking the refrigeration target evaporation temperature T1 as the refrigeration target evaporation temperature Ta of the indoor unit and the cold storage calculation target temperature Tb of the cold storage device when T is greater than a first threshold T1. In some embodiments, the step b1 includes taking the target cold storage temperature T2 as the cold storage calculation target temperature Tb of the cold storage device and taking T3 as the refrigeration calculation target evaporation temperature Ta of the indoor unit when T is smaller than a first threshold T1 and T0 is larger than T2, wherein, k is an adjustment coefficient, and k is larger than 0 and smaller than 1, and T3 is calculated by the following formula of T3=T1-k (T1-T2). In some embodiments, the step b1 further includes closing the connection between the cold storage device and the condenser and the compressor unit after the current temperature T0 of the cold storage medi