Global optimization control method of ground source heat pump

Abstract

The invention discloses a global optimization control method of a ground source heat pump. Physical models of a ground source heat pump unit, a ground heat exchanger and a water pump are established and analyzed, an optimization algorithm is used for optimizing user side flow rate and ground side flow rate, and the optimized value is used as a set value to a bottom layer closed loop control to enable a ground source heat pump system to operate at an optimal state point. According to the global optimization control method of the ground source heat pump, a brand-new global control strategy of the ground source heat pump system is determined by modeling analysis of a compressor, an evaporator and a condenser of the ground source heat pump system and combining a particle swarm optimization algorithm, the influence of external interference and the control strategy on the system are fully considered, corresponding correction compensation measures are set, and strong engineering practical significance is achieved; in the actual operation process, the energy is saved by 14% compared with a constant flow operation strategy, and energy is saved by 6.7% compared with a traditional five-degreetemperature difference control strategy, and the global optimization control method of the ground source heat pump has important significance for saving the operation energy consumption of the groundsource heat pump system.

Description

technical field

[0001] The invention belongs to the technical field of energy saving of geothermal heat pump systems, and in particular relates to a global optimization control method of geothermal heat pumps. Background technique

[0002] The advantages of the ground source heat pump system have been tested in practice, and the International Association of Refrigeration has identified it as a device with great energy-saving potential in the 21st century. Even so, if the ground source heat pump system is improperly designed and operated in the application, it will be difficult to exert its energy-saving characteristics. In the early days, people focused on the rationality of the design process, such as how to ensure that the heat transfer of the buried tube heat exchanger in the rock and soil achieves a balance between winter and summer. Although this kind of optimization from the design point of view has a certain energy-saving effect, it is far less than a reasonable adju...

Examples

Embodiment 1

[0119] For the following ground source heat pump system: two Clement screw heat pump units with a cooling capacity of 1623kW and a heating capacity of 1746kW, the cooling medium of the units is R22, and the temperature of the supply and return water at the user side is 7 / 12°C under the design working conditions in summer , The supply and return water temperature on the user side is 45 / 40°C under the design working conditions in winter. Buried tube heat exchanger The number of boreholes for the underground heat exchanger is 550, all of which are vertical double U-shaped. The design parameters are shown in the table below.

[0120]

[0121]

[0122] Assume that the load on a certain day is:

[0123]

[0124] Bringing the above data into the ground source heat pump optimal control method, after modeling, the partial load efficiency curve of the compressor is as follows: Image 6 shown.

[0125] Use the optimization algorithm to calculate the optimal buried side flow a...

technical field

[0001] The invention belongs to the technical field of energy saving of geothermal heat pump systems, and in particular relates to a global optimization control method of geothermal heat pumps. Background technique

[0002] The advantages of the ground source heat pump system have been tested in practice, and the International Association of Refrigeration has identified it as a device with great energy-saving potential in the 21st century. Even so, if the ground source heat pump system is improperly designed and operated in the application, it will be difficult to exert its energy-saving characteristics. In the early days, people focused on the rationality of the design process, such as how to ensure that the heat transfer of the buried tube heat exchanger in the rock and soil achieves a balance between winter and summer. Although this kind of optimization from the design point of view has a certain energy-saving effect, it is far less than a reasonable adju...

Examples

Embodiment 1

[0119] For the following ground source heat pump system: two Clement screw heat pump units with a cooling capacity of 1623kW and a heating capacity of 1746kW, the cooling medium of the units is R22, and the temperature of the supply and return water at the user side is 7 / 12°C under the design working conditions in summer , The supply and return water temperature on the user side is 45 / 40°C under the design working conditions in winter. Buried tube heat exchanger The number of boreholes for the underground heat exchanger is 550, all of which are vertical double U-shaped. The design parameters are shown in the table below.

[0120]

[0121]

[0122] Assume that the load on a certain day is:

[0123]

[0124] Bringing the above data into the ground source heat pump optimal control method, after modeling, the partial load efficiency curve of the compressor is as follows: Image 6 shown.

[0125] Use the optimization algorithm to calculate the optimal buried side flow a...

Images