Frequency conversion control method

Abstract

The invention discloses a frequency conversion control method. The method includes the following steps that A, the load value is calculated according to the water inlet temperature of a water pump; B, if the load value increases, the working frequency of a heat pump compressor is increased according to the current water inlet temperature, and if the load value decreases, the working frequency of the heat pump compressor is decreased according to the current water inlet temperature and then the frequency of the water pump is decreased. According to the method, heat balance is achieved through the frequency conversion technology during load fluctuation, change situations of heating / refrigerating loads of a current room are judged according to water inlet temperature changes, the compressor and the water pump are controlled for frequency conversion to output proper capacity and water flow rate so that the requirement of current temperature compensation can be met, input of an energy storage water tank is effectively reduced, efficient and safe operation of a unit is guaranteed, and cost and use space are reduced. The frequency conversion control method can be widely applied to the field of heat pumps.

Description

technical field [0001] The invention relates to the field of heat pumps, in particular to a frequency conversion control method. Background technique [0002] In the past, heat pumps were usually fixed-frequency systems. When the heating / cooling load in the room fluctuated, the energy stored in the energy storage tank was usually used as temperature compensation. Although this method can meet the needs of small room heating / cooling load fluctuations temperature compensation, but there are still the following problems: 1. When the room heating / cooling load fluctuates greatly, the energy provided by the energy storage water tank cannot meet the temperature compensation requirements, which greatly affects the water temperature. In order to meet the temperature compensation requirements, the unit It is necessary to stop the machine frequently to compensate for energy, which increases the energy consumption of the unit; 2. Increasing the energy storage water tank to achieve heat ...

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Problems solved by technology

[0002] In the past, heat pumps were usually fixed-frequency systems. When the heating / cooling load in the room fluctuated, the energy stored in the energy storage tank was usually used as temperature compensation. Although this method can meet the needs of small room heating / cooling load fluctuations temperature compensation, but there are still the following problems: 1. When the room heating / cooling load fluctuates greatly, the energy provided by the energy storage water tank cannot meet the temperature compensation requirements, which greatly affects the water temperature. In order to meet the temperature compensation requirements, the unit It is necessary to stop the machine frequently to compensate for energy, which increases the energy consumption of the unit; 2. Increasing the energy storage water tank to achieve heat balance when the load fluctuates not only increases the cost of the entire unit, but also takes up a lot of space

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