A heat recovery control circuit applied to an air conditioner and its control method

Abstract

The invention discloses a heat recovery control circuit of an air conditioner and a control method thereof, comprising a heat recovery start / stop operation and indication unit, a water temperature detection and control unit, an air conditioner system pressure detection unit, a water pump operation and indication unit, and a water flow detection unit With indicating unit, solenoid valve control unit. The control method of the heat recovery control circuit is: when heat recovery is required, turn on the heat recovery switch, the temperature controller detects the water temperature of the water tank, and when the water temperature meets the heat recovery conditions, detect the pressure state of the press system, When the pressure meets the heat recovery conditions, the heat recovery water pump works, and then detects the flow rate of the heat recovery water. When the water flow meets the heat recovery conditions, the water pump continues to run, opens the heat recovery solenoid valve, and closes the bypass solenoid valve to realize the air conditioning system. heat recovery. The invention can realize high-efficiency recovery and utilization of condensation heat, thereby obtaining a high-efficiency and energy-saving heat recovery air conditioner.

Description

technical field [0001] The invention relates to an air conditioner, in particular to a control circuit and a control method for recovering condensation waste heat of the air conditioner. Background technique [0002] At present, when the air conditioner is in use, a large amount of condensation heat is released into the air. If this part of the condensation heat is collected and used to make domestic hot water, not only can a large amount of domestic hot water be obtained for free, but the quality of life and comfort will also improve. It has been further improved, and at the same time, due to the reduction of the condensation load, the energy efficiency ratio of the unit operation is higher and more energy-saving. Therefore, the market demand is huge. [0003] For some specific users and places, air conditioners with special capabilities or special structures are required to provide domestic hot water. In order to meet the needs of specific users or places for air conditio...

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Problems solved by technology

[0004] If the air conditioner manufacturer redevelops and produces the heat recovery air conditioner according to the customer's requirements, it is well known that the heat recovery air conditioner has the characteristics of long development cycle and high cost.

Only the development of the controller used by the air conditioner will take 1 to 2 years to meet the use requirements. The development of the controller includes the design and production of PCB, the redesign and writing of control software, etc., plus the investment of personnel costs, control System testing, etc. will eventually lead to failure to meet customer needs in the short term, and a considerable part of the development cost will inevitably be passed on to the sales price of the air conditioner, which will lead to a substantial increase in the customer's equipment investment cost, resulting in product development. The cycle is long, the cost is high, and the market demand cannot be met in time

[0005] If a person with certain air-conditioning skills uses the existing air conditioner to improve it into an air conditioner with heat recovery function, it is often a single addition of a heat recovery heat exchanger to the system part, and the heat recovery cannot be fully realized in terms of control. Part of the control, the use of the unit is extremely cumbersome: such as the control of the flow direction of the system refrigerant, the control of the water temperature, the water shortage protection of the heat recovery pump, whether the air conditioning system is suitable for heat recovery, etc.

If the water temperature is not controlled, when the water temperature rises above 50°C or even 55°C, the load of the air conditioning system (mainly the load of the compressor) will rise sharply, causing the air conditioner to work in an abnormal working area, seriously affecting the air conditioner. In the end, the service life of the compressor is greatly shortened; in addition, the water temperature is not effectively controlled, and the user's comfort in using it is also greatly reduced

If the heat recovery water pump is not protected against water shortage, the long-term operation of the water pump will cause damage to the water pump under the condition of water shortage in the heat recovery system

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