CN107655164B - Method for controlling opening degree of electronic expansion valve of indoor unit of air conditioner of water system - Google Patents
Method for controlling opening degree of electronic expansion valve of indoor unit of air conditioner of water system Download PDFInfo
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- CN107655164B CN107655164B CN201710801355.4A CN201710801355A CN107655164B CN 107655164 B CN107655164 B CN 107655164B CN 201710801355 A CN201710801355 A CN 201710801355A CN 107655164 B CN107655164 B CN 107655164B
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Abstract
The invention provides a method for controlling the opening degree of an electronic expansion valve of an indoor unit of an air conditioner of a water system, wherein a microprocessor judges whether the indoor unit is in a refrigeration standby state, if the indoor unit is in the refrigeration standby state, the opening degree of the electronic expansion valve of the indoor unit is adjusted to be 60 degrees, the opening degree of the electronic expansion valve of the outdoor unit is 0, the microprocessor detects the outlet water temperature of a heat exchanger of the indoor unit every 10 seconds, whether the indoor unit is operated or not is judged according to the outlet water temperature and a set temperature, the microprocessor sends an operation instruction when the microprocessor judges that the indoor unit needs to be operated, the electronic expansion valve of the indoor unit is adjusted to be 200 degrees within 15 seconds, the electronic expansion valve of the outdoor unit is adjusted to be 130 degrees within 20 seconds, then automatic PI control is carried out by calculating the deviation E between the temperature difference, and if the deviation E is larger than 0, the opening degree of the electronic expansion valve of the indoor unit is increased. Greatly improving the performance of the air conditioner of the water system and increasing the energy efficiency.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a method for controlling the opening degree of an electronic expansion valve of an indoor unit of an air conditioner of a water system.
Background
The control of the electronic expansion valve of the indoor unit during the refrigeration of the traditional fluorine system air conditioner is controlled by the temperature difference between an air pipe and a liquid pipe of a heat exchanger of the indoor unit and a target superheat degree. The basic control logic is that if the gas pipe-liquid pipe temperature is lower than the target superheat degree, the opening degree of the electronic expansion valve is reduced, and if the gas pipe-liquid pipe temperature is higher than the target superheat degree, the opening degree of the electronic expansion valve is increased, and the target superheat degree is generally 3 degrees.
Different from a fin copper tube type heat exchanger used by a fluorine system air conditioner, a shell and tube type heat exchanger is mostly used by the water system air conditioner, the pressure drop of a refrigerant in the fin copper tube type heat exchanger is generally 0.01MPa, and the pressure drop of the refrigerant is generally 0.2MPa due to built-in shunting of the shell and tube type heat exchanger.
Under the normal operating condition: refrigerant in the air conditioner of the fluorine system directly enters the fin copper tube type heat exchanger for evaporation after being throttled by the electronic expansion valve, and the temperature of an air tube is higher than that of a liquid tube; the air-conditioning refrigerant of the water system enters the shell-and-tube heat exchanger after being throttled by the electronic expansion valve and then is throttled for 2 times to begin to evaporate, and the temperature of the air pipe is lower than that of the liquid pipe.
If the water heat exchange module of the water system air conditioner directly uses the control logic of the fluorine system air conditioner and controls the opening of the electronic expansion valve according to the temperature of the air pipe and the liquid pipe, the opening of the electronic expansion valve is too small, the mass flow of a system refrigerant is too small, and the superheat degree of an outlet of the shell-and-tube heat exchanger is too large, so that the capacity of the whole system is insufficient, and the operation efficiency is low.
Disclosure of Invention
The invention provides a method for controlling the opening degree of an electronic expansion valve of an indoor unit of an air conditioner of a water system, which solves the problems of insufficient system energy efficiency, unstable operation and the like of the existing method for controlling the electronic expansion valve of the indoor unit of the air conditioner of the water system by using a fluorine system.
The invention provides a method for controlling the opening degree of an electronic expansion valve of an indoor unit of an air conditioner of a water system, which comprises the steps that a microprocessor judges whether the indoor unit is in a refrigeration standby state, if the indoor unit is in the refrigeration standby state, the opening degree of the electronic expansion valve of the indoor unit is adjusted to be 60 degrees, the opening degree of the electronic expansion valve of the outdoor unit is 0, the microprocessor detects the water outlet temperature of a heat exchanger of the indoor unit every 10 seconds, whether the indoor unit is operated or not is judged according to the water outlet temperature and the set temperature, the microprocessor sends an operation instruction when the microprocessor judges that the indoor unit needs to be operated, the electronic expansion valve of the indoor unit is adjusted to be 200 degrees within 15 seconds, the electronic expansion valve of the outdoor unit is adjusted to be 130 degrees within 20 seconds, then automatic PI control is carried out by calculating the deviation E, if the deviation E is larger than 0, the opening degree of the electronic expansion valve of the indoor unit is increased,
the deviation E is calculated by the formula E (n) = { tout (n) -tin (n) } -SH,
wherein Tout (n) is the temperature of the air pipe of the heat exchanger of the indoor unit sampled at the nth time, tin (n) is the temperature of the liquid pipe of the heat exchanger of the indoor unit sampled at the nth time, and the superheat SH is set to be-6.5 deg.
The invention has the beneficial effects that: the superheat degree of the outlet of the shell-and-tube heat exchanger can be kept at about 5 degrees, the safety of the system is guaranteed, meanwhile, the heat exchange capacity of the shell-and-tube heat exchanger is utilized to the maximum degree, the performance of a machine is improved, and the efficiency of the whole system is improved.
Drawings
FIG. 1 is a schematic diagram of an air conditioner of a water system according to an embodiment.
The attached drawings are marked as follows:
1. the system comprises a compressor, 2, a four-way valve, 3, an outdoor unit heat exchanger, 4, an outdoor unit electronic expansion valve, 5, a supercooling pipe, 6, a gas-liquid separator, 7, an indoor unit heat exchanger, 8, an indoor unit electronic expansion valve, 9, a water outlet, 10 and a water return port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and should not be construed as limiting the scope of the invention.
Examples
Fig. 1 shows a water system air conditioner applying the method of the present embodiment, and the water system air conditioner includes a compressor 1, a four-way valve 2, an outdoor unit heat exchanger 3, an outdoor unit electronic expansion valve 4, a supercooling pipe 5, a gas-liquid separator 6, an indoor unit heat exchanger 7, an indoor unit electronic expansion valve 8, a water outlet 9, and a water return port 10. The electronic expansion valve 8 of the indoor unit of the water system air conditioner is throttled and then connected with the heat exchanger 7 of the indoor unit in two paths, so that the target high-pressure of the system can be reduced, and the performance of the whole air conditioner is improved. When the system is used for refrigerating, the compressor 1 is started, the coil of the four-way valve 2 is not electrified, the circulating pump of the heat exchanger 7 of the indoor unit is started, and the fan of the outdoor unit is started. The refrigerant flow direction: compressor 1 → four-way valve 2 → outdoor unit heat exchanger 3 → outdoor unit electronic expansion valve 4 → supercooled tube 5 → indoor unit electronic expansion valve 8 → indoor unit heat exchanger 7 → four-way valve 2 → gas-liquid separator 6 → compressor 1;
during refrigeration: the compressor 1 condenses the high-temperature and high-pressure refrigerant by the outdoor heat exchanger 3 to become high-temperature and high-pressure liquid, then changes the refrigerant into low-temperature and low-pressure liquid by the outdoor electronic expansion valve 4 and the supercooling pipe 5, and intercepts the refrigerant by the indoor electronic expansion valve 8, so that the temperature is lower, the refrigerant is evaporated by the pipe shell loop in the indoor heat exchanger 7, and the outlet water temperature of the water outlet 9 is reduced, thereby realizing the refrigeration control. In the above refrigeration process, the method for controlling the opening degree of the electronic expansion valve 8 of the indoor unit comprises the following steps:
the microprocessor judges whether the indoor unit is in a refrigeration standby state, if the indoor unit is in the refrigeration standby state, the opening degree of the electronic expansion valve 8 of the indoor unit is adjusted to 60, the opening degree of the electronic expansion valve 4 of the outdoor unit is 0, the microprocessor detects the water outlet temperature of the heat exchanger 7 of the indoor unit every 10 seconds, judges whether the operation is carried out according to the water outlet temperature and the set temperature, when the microprocessor judges that the operation is needed, the microprocessor sends an operation instruction, the electronic expansion valve 8 of the indoor unit is adjusted to 200 within 15 seconds, the electronic expansion valve 4 of the outdoor unit is adjusted to 130 within 20 seconds, then automatic PI control is carried out by calculating the deviation E between the temperature difference T of an air pipe and a liquid pipe of the heat exchanger 7 of the indoor unit and a superheat degree set value SH, if the deviation E is less than 0, the opening degree of the electronic expansion valve,
the deviation E is calculated by the formula E (n) = { tout (n) -tin (n) } -SH,
wherein Tout (n) is the air pipe temperature of the indoor unit heat exchanger 7 sampled at the nth time, tin (n) is the liquid pipe temperature of the indoor unit heat exchanger 7 sampled at the nth time, and the superheat SH is set to be-6.5 deg.
Claims (1)
1. A method for controlling the opening degree of an electronic expansion valve of an indoor unit of an air conditioner of a water system is characterized by comprising the following steps: the microprocessor judges whether the indoor unit is in a refrigeration standby state, if the indoor unit is in the refrigeration standby state, the opening degree of an electronic expansion valve of the indoor unit is adjusted to 60, the opening degree of the electronic expansion valve of the outdoor unit is 0, the microprocessor detects the outlet water temperature of a heat exchanger of the indoor unit every 10 seconds, judges whether the operation is carried out according to the outlet water temperature and the set temperature, when the microprocessor judges that the operation is required, an operation instruction is sent, the electronic expansion valve of the indoor unit is adjusted to 200 within 15 seconds, the electronic expansion valve of the outdoor unit is adjusted to 130 within 20 seconds, then automatic PI control is carried out by calculating the deviation E between the temperature difference T of an air pipe and a liquid pipe of a heat exchanger of the indoor unit and a superheat setting value SH of the superheat degree, if the deviation E is less than 0, the opening degree,
the deviation E is calculated by the formula E (n) = { tout (n) -tin (n) } -SH,
wherein Tout (n) is the temperature of the air pipe of the heat exchanger of the indoor unit sampled at the nth time, tin (n) is the temperature of the liquid pipe of the heat exchanger of the indoor unit sampled at the nth time, the set value SH of the superheat degree is set to be-6.5 deg, and deg is the temperature degree.
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| CN108626857A (en) * | 2018-05-10 | 2018-10-09 | 广东美的制冷设备有限公司 | Progress control method, operating control device and air-conditioner system |
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| CN111023423B (en) * | 2019-12-27 | 2021-05-14 | 宁波奥克斯电气股份有限公司 | Control method and device for electronic expansion valve of air conditioner, medium and air conditioner |
| CN113091175A (en) * | 2021-05-11 | 2021-07-09 | 沈阳建筑大学 | Refrigerant flow control system based on double-end air source heat pump |
| CN113639395B (en) * | 2021-08-05 | 2023-02-28 | 青岛海尔空调电子有限公司 | Control method and system of multi-split air conditioner and multi-split air conditioner |
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