Control valve opening degree control method based on exhaust temperature of water heater and temperature of water tank

Abstract

The invention relates to a control valve opening degree control method based on the exhaust temperature and the water tank temperature of a water heater. The control valve opening degree control method is characterized by comprising the following steps that S1, the outdoor temperature T1, the water tank temperature T2 of the water heater and the exhaust temperature TD are obtained; s2, a target exhaust temperature value TDSET is set; s3, setting exhaust difference TD

Description

Technical Field

[0001] The invention relates to a control valve opening control method based on the exhaust temperature and water tank temperature of a water heater. Background Art

[0002] Currently, there is no logical control method for the existing water heater exhaust temperature, water tank temperature, and control valve opening. During the water heater heating process, the water heater cannot be in optimal condition, and the system heating process cannot be fully optimized. The water heater exhaust / high temperature protection relies on a high-pressure switch, and the system high temperature protection is not timely. Under low water temperature conditions, the difference between the target return air superheat and the valve body opening is large, which is not conducive to improving the COP. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a control valve opening control method based on the exhaust temperature of the water heater and the water tank temperature, and provide a low-cost, high-reliability exhaust temperature establishment, protection and valve body adjustment solution to ensure that the fixed frequency system can quickly and effectively control the valve body opening through the exhaust temperature under various environmental conditions, so that the system state reaches a more ideal state, improves capacity and energy efficiency, and at the same time avoids system abnormalities caused by excessive exhaust temperature.

[0004] In order to achieve the above object, the present invention is implemented as follows: a method for controlling the opening of a control valve based on the exhaust temperature and the water tank temperature of a water heater comprises the following steps: S1, obtain the outdoor temperature T1, the water tank temperature T2 of the water heater and the exhaust temperature TD; S2. Set a target exhaust temperature value TD SET, TD SET=A*T2+B, where A and B are adjusted according to different T1 temperature zones, different models and different refrigerant quantities; S3, set the exhaust difference TD D, TD D=TD SET-TD; S4、TD The opening of D and control valve is adjusted as follows, the valve body opening adjustment cycle is 25S-35S; S5. When TD D≥10℃ or TD When D≤-10℃, add parameter K, the range of K is 1.1≤K≤2; when TD D≥10℃, valve body adjustment value 9K, in TD When D≤5℃, the valve body opening adjustment value returns to normal. When D≤-10℃, the valve body adjustment value is -9K, and when TDD≥-5℃, it returns to the normal valve body opening adjustment value.

[0005] In this technical solution, when the set water temperature of the water heater changes, the detection cycle time of T2 is 5S-15S.

[0006] In this technical solution, when the ambient temperature T1 changes, the detection cycle time of T2 is 55S-65S.

[0007] In this technical solution, when S5, the valve body opening adjustment cycle is 10S-20S.

[0008] In this technical solution, when S4, the valve body opening adjustment cycle is 30S.

[0009] In this technical solution, the detection cycle time of T2 is 10S.

[0010] In this technical solution, the detection cycle time of T2 is 60S.

[0011] In this technical solution, the valve body opening adjustment cycle is 15S.

[0012] The advantages of the present invention compared with the existing technology are: providing a low-cost, highly reliable exhaust temperature establishment, protection and valve body adjustment solution, ensuring that the fixed-frequency system can quickly and effectively control the valve body opening through the exhaust temperature under various environmental conditions, so that the system state reaches a relatively ideal state, improves capacity and energy efficiency, and avoids system abnormalities caused by excessive exhaust temperature. DETAILED DESCRIPTION

[0013] The following is a further description of specific embodiments of the present invention. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0014] In the description of the present invention, the terms "upper", "lower", "front" and "back" indicate directions or positional relationships based on directions or positional relationships. They are only used to facilitate the description of the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0015] In the present invention, unless otherwise expressly specified or limited, the terms "connection" and "connected" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to mechanical connection, direct connection, or indirect connection through an intermediate medium; they may enable internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0016] The method is a control valve opening control method based on the exhaust temperature of the water heater and the water tank temperature, comprising the following steps: S1, obtain the outdoor temperature T1, the water tank temperature T2 of the water heater and the exhaust temperature TD; S2. Set a target exhaust temperature value TD SET, TD SET=A*T2+B, where A and B are adjusted according to different T1 temperature zones, different models and different refrigerant quantities; When the water tank capacity of the water heater is 120L, the refrigerant is R290 150g, the compressor is GM RDSK57V11EZR, and the equipment model is 120L all-in-one with top air outlet: Heating target exhaust temperature is controlled by zone, divided according to ambient temperature and water temperature: Temperature zone nine T1 ≥ 46°C, add a safety factor of 0.9 according to the formula for temperature zone eight Temperature zone 846>T1≥40℃, TD SET=0.8314T2 + 27.313 Temperature zone 7 40>T2≥35℃, TD SET=0.8443T2 + 25.789 Temperature zone 6 35>T2≥30℃, TD SET=0.7851T2 + 27.35 Temperature zone 5 30>T2≥20℃, TD SET=0.8675T2 + 22.063 Temperature zone 4 20>T2≥14℃, TD SET=0.7935T2 + 25.467 Temperature zone 3 14>T2≥7℃, TD SET=0.8063T2 + 24.699 Temperature zone 27>T2≥-2℃, TD SET=0.8065T2 + 23.407 Temperature zone 1-2>T2, operate at a fixed opening, and the specific opening is based on the actual measured value of the system.

[0017] S3, set the exhaust difference TD D, TD D=TD SET-TD; S4、TD The opening of D and control valve is adjusted as follows, the valve body opening adjustment cycle is 25S-35S;

[0018] S5. When TD D≥10℃ or TD When D≤-10℃, add parameter K, the range of K is 1.1≤K≤2; when TD D≥10℃, valve body adjustment value 9K, in TD When D≤5℃, the valve body opening adjustment value returns to normal. When D≤-10℃, the valve body adjustment value is -9K, and when TDD≥-5℃, it returns to the normal valve body opening adjustment value.

[0019] In this embodiment, when the set water temperature of the water heater changes, the detection cycle time of T2 is 5S-15S.

[0020] In this embodiment, after the ambient temperature T1 changes, the detection cycle time of T2 is 55S-65S.

[0021] In this embodiment, at S5, the valve body opening adjustment period is 10S-20S.

[0022] In this embodiment, at S4, the valve body opening adjustment period is 30S.

[0023] In this embodiment, the detection cycle time of T2 is 10S.

[0024] In this embodiment, the detection cycle time of T2 is 60S.

[0025] In this embodiment, the valve body opening adjustment period is 15S.

[0026] The embodiments of the present invention are described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and purpose of the present invention are still within the scope of protection of the present invention.

Claims

1. A control valve opening control method based on the exhaust temperature and water tank temperature of a water heater, characterized in that The following steps are involved: S1, obtain the outdoor temperature T1, the water tank temperature T2 of the water heater and the exhaust temperature TD; S2. Set a target exhaust temperature value TDSET, TDSET=A*T2+B, where A and B are adjusted according to different T1 temperature zones, different models and different refrigerant quantities; S3. Set the exhaust difference TDD, TDD=TDSET-TD; The opening adjustment of S4, TDD and control valve is as follows, and the valve body opening adjustment cycle is 25S-35S; S5. When TDD≥10℃ or TDD≤-10℃, add parameter K, the range of K is between 1.1≤K≤2; when TDD≥10℃, the valve body adjustment value is 9K, and when TDD≤5℃, it returns to the normal valve body opening adjustment value. When TDD When D≤-10℃, the valve body adjustment value is -9K, and when TDD≥-5℃, it returns to the normal valve body opening adjustment value.

2. The control valve opening control method based on the water heater exhaust temperature and water tank temperature according to claim 1 is characterized in that When the set water temperature of the water heater changes, the detection cycle time of T2 is 5S-15S.

3. The control valve opening control method based on the water heater exhaust temperature and water tank temperature according to claim 1 is characterized in that When the ambient temperature T1 changes, the detection cycle time of T2 is 55S-65S.

4. The control valve opening control method based on the water heater exhaust temperature and water tank temperature according to claim 1 is characterized in that When S5, the valve body opening adjustment cycle is 10S-20S.

5. The control valve opening control method based on the water heater exhaust temperature and water tank temperature according to claim 1 is characterized in that When S4, the valve body opening adjustment cycle is 30S.

6. The method for controlling the opening of a control valve based on the exhaust temperature and the water tank temperature of a water heater according to claim 2, characterized in that The detection cycle time of T2 is 10S.

7. The method for controlling the opening of a control valve based on the exhaust temperature and the water tank temperature of a water heater according to claim 3, characterized in that The detection cycle time of T2 is 60S.

8. The method for controlling the opening of a control valve based on the exhaust temperature and the water tank temperature of a water heater according to claim 4, characterized in that The valve opening adjustment cycle is 15S.

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