Energy-saving kitchen air conditioning system and control method thereof

Abstract

The present application relates to the field of kitchen air conditioner, disclose a kind of energy-saving kitchen air conditioning system and its control method, air conditioning system includes compressor, condenser, throttling device and evaporator, evaporator is provided with evaporative fan, the air inlet of evaporator is provided with back air temperature sensor for measuring back air temperature T1, condensing temperature sensor for measuring the condensing temperature T2 of refrigerant is arranged on the pipeline that refrigerant flows out from condenser, condenser is provided with condensing fan and circulating water system, circulating water system is driven by circulating water pump and operates;The present application controls the start-stop of evaporative fan and compressor according to the value of back air temperature T1, controls the start-stop and operating mode of condensing fan and circulating water pump according to the value of condensing temperature T2, greatly improves the heat exchange efficiency of air conditioning system, so that condensing fan can achieve the same refrigeration effect with lower speed, that is, achieve the purpose of energy saving, and can also reduce the operating noise of condensing fan.

Description

Technical Field

[0001] This invention relates to the field of kitchen air conditioning, and more particularly to an energy-saving kitchen air conditioning system and a control method for such a system. Background Technology

[0002] Cooking in the kitchen often involves open flames or other electrically heated kitchen equipment for steaming, grilling, frying, boiling, stir-frying, and other cooking methods. While range hoods installed in the kitchen can remove the fumes and steam generated during cooking, heating food inevitably raises the temperature inside the kitchen. People are then forced to work in this high-temperature environment, which can cause discomfort and significantly impact the cooking experience.

[0003] To address the high-temperature environment of kitchens, specialized kitchen air conditioners have been developed. Kitchen air conditioners share the same structure and operating principle as regular air conditioners, consisting of a compressor, expansion valve, condenser, and evaporator. Currently, most kitchen air conditioners on the market are air-cooled, with their internal condensers cooled by airflow. Because the heat load in a kitchen is significantly higher than in a living room or bedroom, the condenser fan used for cooling the condenser typically has a high power consumption to ensure effective cooling. This results in high energy consumption per unit time for kitchen air conditioners, which is not energy-efficient.

[0004] On the other hand, the control system of air-cooled kitchen air conditioners typically controls the condenser fan speed and thus the airflow based on the condensing temperature. Since condenser fans usually only have two speed settings (high and low) with minimal difference in airflow, this control system doesn't offer significant energy savings. Furthermore, maintaining a high fan speed continuously can cause noise problems. Therefore, it's necessary to design an energy-efficient, noise-reducing air conditioning system and corresponding control method that can flexibly adapt to kitchen conditions. Summary of the Invention

[0005] To address the problems existing in current technologies, such as high energy consumption, lack of significant energy-saving effects in their control systems, and noise issues during operation, this invention aims to provide an energy-saving kitchen air conditioning system and its control method. This system rationally combines air cooling and water cooling, with both working together to exchange heat in the condenser, greatly improving the heat exchange efficiency of the air conditioning system. This allows the condenser fan to achieve the same cooling effect with lower power and speed, significantly reducing energy consumption and operating noise. Simultaneously, real-time temperature data transmitted by a temperature sensor allows the system to automatically activate and switch different heat exchange modes according to actual needs, featuring automatic control switching and adaptive functions. This achieves both energy saving and reduced condenser fan noise.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] An energy-saving kitchen air conditioning system includes a compressor, a condenser, a throttling device, and an evaporator connected by pipes. The refrigerant circulates along the pipes. An evaporator fan is installed on the evaporator to accelerate the evaporation of the refrigerant. A return air temperature sensor for measuring the return air temperature T1 is installed at the air inlet of the evaporator. A condensing temperature sensor for measuring the condensing temperature T2 of the refrigerant is installed on the pipe from which the refrigerant flows out of the condenser. A condenser fan and a circulating water system are installed inside the condenser. Both the condenser fan and the circulating water system are used to cool the refrigerant inside the condenser. The circulating water system is driven by a circulating water pump.

[0008] The invention is further configured such that: a heat exchange coil for refrigerant circulation and heat exchange is provided inside the condenser; the circulating water system also includes a spraying mechanism and a water tank; the spraying mechanism sprays medium water onto the heat exchange coil; the water tank is located at the bottom of the condenser so that the medium water dripping from the heat exchange coil falls into the water tank; the circulating water pump pumps the medium water in the water tank into the spraying mechanism; the condenser is provided with an air inlet and an air outlet; the condenser fan operates to allow air to enter the condenser from the air inlet; after entering the condenser, the air passes through the heat exchange coil and cools the heat exchange coil.

[0009] The invention is further configured such that the spraying mechanism is located above the heat exchange coil.

[0010] The present invention is further configured such that: the air inlet includes a first air inlet and a second air inlet; the operation of the condenser fan causes air to enter the condenser simultaneously from the first air inlet and the second air inlet; the air entering the condenser from the first air inlet passes through the heat exchange coil and cools the heat exchange coil; the second air inlet is located below the heat exchange coil; the air entering the condenser from the second air inlet passes through and cools the medium water dripping from the heat exchange coil.

[0011] The present invention is further configured such that: the condenser further includes packing material, the packing material is located below the heat exchange coil, and the air entering the condenser from the second air inlet passes through the packing material.

[0012] The present invention is further configured such that: the first air inlet is located above the heat exchange coil, and the air entering the condenser from the first air inlet passes through the packing.

[0013] The present invention is further configured such that: the condenser further includes a first oil removal filter, the first oil removal filter being located upstream of the first air inlet to filter the air passing through the first air inlet.

[0014] The present invention is further configured such that: the condenser further includes a second oil removal filter, the second oil removal filter being located upstream of the second air inlet to filter the air passing through the second air inlet.

[0015] The present invention is further configured such that: the condenser further includes a scale remover, the scale remover is disposed on the pipeline between the circulating water pump and the spraying mechanism, and the scale remover is used for filtering the medium water.

[0016] The present invention is further configured such that: a first cavity and a second cavity are provided inside the condenser, the first air inlet and the second air inlet are both provided on the first cavity, the lower part of the first cavity is communicated with the second cavity, the air in the first cavity enters the second cavity after passing through the packing, the air outlet is located at the top of the second cavity, and the bottoms of the first cavity and the second cavity are both communicated with the water tank.

[0017] The present invention is further configured such that: the condensation fan is located at the top of the second cavity and below the air outlet.

[0018] The present invention also provides a control method for an energy-saving kitchen air-conditioning system, which is used to control the above-mentioned energy-saving kitchen air-conditioning system, start and stop the evaporation fan and the compressor according to the value of the return air temperature T1, and start and stop and control the operating mode of the condensation fan and the circulating water pump according to the value of the condensation temperature T2.

[0019] The present invention is further configured such that: the preset air-conditioning set temperature is Ta, the preset low-grade condensation temperature is Tc1, the medium-grade condensation temperature is Tc2, the high-grade condensation temperature is Tc3, and Ta < Tc1 < Tc2 < Tc3. When the value of T1 exceeds Ta, the evaporation fan and the compressor start to operate, otherwise they do not operate.

[0020] The present invention is further configured such that: when the value of T2 does not exceed Tc1, the evaporation fan and the compressor maintain the operating state.

[0021] The present invention is further configured such that: when the value of T2 exceeds Tc1 and does not exceed Tc2, the evaporation fan and the compressor maintain the operating state, and at the same time the condensation fan starts to operate.

[0022] The present invention is further configured such that: the condensation fan operates at a linear proportional speed regulation within the speed regulation range corresponding to the temperature range from Tc1 to Tc2.

[0023] The present invention is further configured such that: when the value of T2 exceeds Tc2 and does not exceed Tc3, the evaporation fan and the compressor maintain the operating state, and at the same time the condensation fan and the circulating water pump start to operate.

[0024] The present invention is further configured such that: the condensation fan and the circulating water pump operate in a fuzzy control manner within the speed regulation range corresponding to the temperature range from Tc2 to Tc3.

[0025] The present invention is further configured such that: when the value of T2 exceeds Tc3, the evaporation fan and the compressor maintain the operating state, and at the same time the condensation fan and the circulating water pump operate at the highest speed.

[0026] In summary, the beneficial effects achieved by this invention are as follows:

[0027] (1) The spray mechanism sprays medium water onto the heat exchange coil containing high-temperature refrigerant. The medium water exchanges heat with the refrigerant through the heat exchange coil, causing the temperature of the medium water to rise, and some of the medium water absorbs heat and vaporizes. Through heat exchange, the heat of the refrigerant is converted into the sensible heat and latent heat of the medium water. Since the sensible heat of water is greater than that of air, and the latent heat of water is much greater than that of sensible heat, this cooling method greatly improves the condensing efficiency of the condenser. At the same time, the air entering the condenser from the air inlet not only accelerates the vaporization of the medium water by accelerating evaporation after passing through the heat exchange coil, but also has the effect of air cooling the heat exchange coil. The air can also absorb the heat of the heat exchange coil, achieving the effect of simultaneously utilizing the sensible heat of air, the sensible heat of water, and the latent heat of water to cool the heat exchange coil. This cooling method allows the condenser fan to achieve the same cooling effect with lower power and speed, thus significantly reducing the energy consumption and operating noise of the condenser fan.

[0028] (2) The air conditioner needs to be turned on based on the return air temperature T1 at the air inlet of the evaporator. The evaporator fan and compressor will start running only when the value of T1 exceeds the set temperature Ta of the air conditioner, thus realizing the control function of automatically turning the air conditioner on and off according to the actual situation.

[0029] (3) The start and stop of the condensing fan and the circulating water pump are controlled according to the relationship between the value of the condensing temperature T2 and the preset three condensing temperatures Tc1, Tc2 and Tc3, as well as the operating mode of the condensing fan and the circulating water pump. This realizes the automatic switching of different operating modes, automatic control switching and adaptive function according to actual needs.

[0030] (4) While reducing the speed and noise, the condenser fan also avoids the problem of excessive negative pressure in the kitchen caused by a large amount of air being sucked away.

[0031] (5) The condenser fan can achieve the same cooling effect as the air-cooled kitchen air conditioner when it operates at a lower power and speed. Therefore, when the condenser fan and the circulating water pump are running at the highest speed, the cooling effect of the air conditioning system per unit time is significantly better than that of the traditional air-cooled kitchen air conditioner, and it can be used in places with higher unit heat load. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the specification will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0033] Figure 1 This is a system flowchart of the energy-saving kitchen air conditioner in this invention;

[0034] Figure 2 This is a schematic diagram of the condenser's structure in this invention;

[0035] Figure 3 This is a control flowchart of the kitchen air conditioning control system in this invention.

[0036] In the diagram: 1. Compressor; 2. Condenser; 3. Filter; 4. Throttling device; 5. Evaporator; 6. First oil removal filter; 7. First air inlet; 8. Spray mechanism; 9. Heat exchange coil; 10. Second air inlet; 11. Descaling device; 12. Circulating water pump; 13. Water tank; 14. Packing material; 15. Condenser fan; 16. High-temperature and high-pressure gaseous refrigerant; 17. Low-temperature and high-pressure liquid refrigerant; 18. Second oil removal filter; 19. Condenser temperature sensor; 20. Return air temperature sensor; 21. Evaporator fan; 22. First chamber; 23. Second chamber; 24. Air outlet. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. For ease of explanation, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "inner," "outer," "bottom," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] It should be noted that the embodiments and features involved in the embodiments of this invention can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0039] As attached Figure 1-3 As shown, an energy-saving kitchen air conditioning system includes a compressor 1, a condenser 2, a filter 3, a throttling device 4, and an evaporator 5 connected in sequence by pipes.

[0040] The air conditioning system circulates refrigerant through its piping. When compressor 1 is powered on, it first draws in low-temperature, low-pressure gaseous refrigerant from evaporator 5. This gaseous refrigerant is then compressed by compressor 1 into high-temperature, high-pressure gaseous refrigerant, which is then forced into condenser 2 for cooling. In condenser 2, the high-temperature, high-pressure gaseous refrigerant releases heat, becoming low-temperature, high-pressure liquid refrigerant. This liquid refrigerant passes through filter 3 to remove impurities from the system, and then passes through throttling device 4 to reduce its pressure before being sent to evaporator 5. During the throttling process, some of the liquid refrigerant evaporates, becoming low-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gas-liquid mixture entering evaporator 5 absorbs heat from the kitchen air, becoming entirely low-temperature, low-pressure gaseous refrigerant, which then returns to compressor 1. The cycle continues to operate to lower the kitchen temperature.

[0041] The above structures are all existing technologies and will not be described in detail. In this invention, the condenser 2 is equipped with a heat exchange coil 9 for refrigerant heat dissipation. After flowing into the condenser 2, the refrigerant is inside the heat exchange coil 9 and flows along it. The heat exchange coil 9 is made of a material with high thermal conductivity, generally a metal, such as copper. In this embodiment, the heat exchange coil 9 can be made of stainless steel, and it is arranged in a triangular pattern to increase its heat dissipation area. High-temperature, high-pressure gaseous refrigerant 16 enters the condenser 2 from one end of the heat exchange coil 9, and after heat exchange and cooling, forms a low-temperature, high-pressure liquid refrigerant 17 which flows out of the condenser 2 from the other end of the heat exchange coil 9 and flows towards the filter 3.

[0042] An evaporator fan 21 is installed on the evaporator 5 to accelerate the heat exchange and evaporation of the refrigerant by accelerating airflow. A return air temperature sensor 20 is installed at the air inlet of the evaporator 5 to measure the return air temperature T1. A condensing temperature sensor 19 is installed on the pipe from which the refrigerant flows out of the condenser 2 to measure the condensing temperature T2 of the refrigerant. Both the return air temperature sensor 20 and the condensing temperature sensor 19 are electrically connected to the controller of the air conditioning system, transmitting the return air temperature T1 at the air inlet of the evaporator 5 and the condensing temperature T2 of the refrigerant to the controller in real time for analysis and processing.

[0043] The condenser 2 is equipped with a condenser fan 15 and a circulating water system, both of which are used to cool the refrigerant in the heat exchange coil 9 within the condenser 2. The circulating water system includes a water tank 13, a circulating water pump 12, a descaling device 11, and a spray mechanism 8. The circulating water pump 12 pumps the medium water from the water tank 13 into the spray mechanism 8 through the circulating water pipeline.

[0044] The condenser 2 is equipped with an air inlet and an air outlet 24. There are two air inlets: a first air inlet 7 and a second air inlet 10. The condenser fan 15 operates to allow air to simultaneously enter the condenser 2 from both the first air inlet 7 and the second air inlet 10. After entering the condenser 2, the air passes through the heat exchange coil 9, thereby cooling the heat exchange coil 9. Specifically, the condenser 2 is internally divided into a first cavity 22 and a second cavity 23, with only the lower part of the first cavity 22 communicating with the second cavity 23.

[0045] The first air inlet 7 and the second air inlet 10 are both located on the first cavity 22. The first air inlet 7 is located at the top of the first cavity 22 and above the heat exchange coil 9, while the second air inlet 10 is located below the heat exchange coil 9 and is directly opposite the connection between the first cavity 22 and the second cavity 23.

[0046] Air outlet 24 is located at the top of the second cavity 23, and condenser fan 15 is located at the top of the second cavity 23 and below air outlet 24. When condenser fan 15 is powered on, it draws air out of the second cavity 23 and exhausts it to the outside, creating a negative pressure inside the second cavity 23. This negative pressure is transmitted to the first cavity 22 through the connection between the first cavity 22 and the second cavity 23, causing air from the kitchen to enter the first cavity 22 simultaneously from the first air inlet 7 and the second air inlet 10.

[0047] The water tank 13 is located at the bottom of the condenser 2, and the bottoms of the first cavity 22 and the second cavity 23 are both connected to the water tank 13, so that the medium water in the first cavity 22 and the second cavity 23 can fall into the water tank 13 under the action of gravity.

[0048] One end of the circulating water pump 12 is connected to the water tank 13 and the other end is connected to the spraying mechanism 8, so that the circulating water pump 12 can continuously pump the medium water in the water tank 13 into the spraying mechanism 8.

[0049] The spray mechanism 8 is located directly above the heat exchange coil 9. The spray mechanism 8 sprays medium water onto the heat exchange coil 9 through several nozzles. The medium water can exchange heat when it comes into contact with the heat exchange coil 9 during its natural fall.

[0050] The descaling device 11 is installed on the circulating water pipeline between the circulating water pump 12 and the spraying mechanism 8. The descaling device 11 is existing technology. In this invention, it is used to filter the medium water to avoid the formation of scale on the inner wall of the heat exchange coil 9 after long-term use, which would greatly reduce the heat exchange efficiency, affect product performance, and maintain the heat exchange performance of the air conditioning system.

[0051] The medium water absorbs heat from heat exchange coil 9, causing its temperature to rise, and some of the medium water vaporizes while absorbing heat. Through heat exchange, the heat from heat exchange coil 9 is converted into sensible heat (heating of the medium water) and latent heat (vaporization of the medium water). Sensible heat is the heat absorbed or released by an object during heating or cooling, when its temperature rises or falls without changing its original phase; latent heat is the heat absorbed or released by an object during the absorption or release of heat when its phase changes but its temperature does not change. When the temperature rises by the same amount, the sensible heat of water is greater than that of air, and the latent heat of water is much greater than its sensible heat.

[0052] Under the negative pressure inside the condenser 2, the air entering the condenser 2 from the first air inlet 7 passes through the heat exchange coil 9 at a speed of 2~5 m / s. The rapidly flowing air accelerates the vaporization of the medium water by accelerating evaporation, that is, it accelerates the medium water to absorb a large amount of latent heat through vaporization. At the same time, the air entering from the first air inlet 7 also has the effect of air cooling the heat exchange coil 9, and the air can also absorb heat from the heat exchange coil 9, ultimately achieving the effect of simultaneously utilizing the sensible heat of the air, the sensible heat of the water, and the latent heat of the water to cool the heat exchange coil 9.

[0053] The condenser 2 also includes packing 14. Packing 14 is an important structure used in cooling towers in the prior art. The function of packing 14 in the cooling tower is to increase heat dissipation, extend the residence time of cooling water, increase the heat exchange area, and increase the heat exchange capacity. A cooling tower is an existing device for cooling hot fluids. In this embodiment, the function of packing 14 is the same as that of packing 14 in a cooling tower, and the material of packing 14 is preferably polypropylene, abbreviated as PP.

[0054] The packing 14 is located directly below the heat exchange coil 9, and the packing 14 is located between the connection between the first cavity 22 and the second cavity 23 and the second air inlet 10, so that the air entering the first cavity 22 from the first air inlet 7 and the second air inlet 10 must pass through the packing 14 before entering the second cavity 23.

[0055] After the medium water is sprayed onto the heat exchange coil 9, the heat-absorbing medium water naturally falls onto the packing 14 under the action of gravity. The steam after absorbing heat and vaporizing passes through the packing 14 along with the air entering the first chamber 22 from the first air inlet 7. The heat-absorbing medium water and water vapor exchange heat with the air entering the first chamber 22 from the second air inlet 10 on the packing 14. The steam releases heat and liquefies, falling into the water tank 13 along with the cooled medium water, realizing the recycling of the medium water and greatly reducing the consumption of water resources. In addition, as the air mixed with some water vapor moves upward from the bottom of the second chamber 23, the cooled and liquefied medium water can still fall naturally into the water tank 13 under the action of gravity, so as to maximize the recovery of medium water. Only 5% of the total medium water is discharged from the condenser 2 through the air outlet 24, which greatly reduces the water consumption of the air conditioning system.

[0056] The condenser 2 further includes a first oil removal filter 6 and a second oil removal filter 18.

[0057] The first oil removal filter 6 is located upstream of the first air inlet 7 to filter the air passing through the first air inlet 7, and the second oil removal filter 18 is located upstream of the second air inlet 10 to filter the air passing through the second air inlet 10. The first oil removal filter 6 and the second oil removal filter 18 can effectively remove impurities such as oil fume particles mixed in the kitchen air. Regularly cleaning and replacing the first oil removal filter 6 and the second oil removal filter 18 can prevent impurities from adhering to the heat exchange coil 9 or the packing 14, and ensure the heat exchange performance of the heat exchange coil 9 and the packing 14 and the cleanliness of the circulating water quality.

[0058] Specifically, since the condenser 2 simultaneously utilizes the sensible heat of air, the sensible heat of water, and the latent heat of water to cool the heat exchange coil 9 together, the cooling efficiency is greatly improved, and the energy efficiency ratio is above 3.5. Therefore, the condensing fan 15 can reduce the power within a certain range to reduce the air volume on the premise of maintaining the air-conditioning refrigeration effect. While reducing the rotational speed to reduce noise, the condensing fan also avoids the problem of excessive negative pressure in the kitchen caused by a large amount of air being sucked away in the kitchen.

[0059] To fully utilize the energy-saving and heat-dissipating advantages of the above energy-saving kitchen air-conditioning system, the present invention provides a control method for an energy-saving kitchen air-conditioning system, which is used to control the energy-saving kitchen air-conditioning system in the present invention. The control logic is to control the start and stop of the evaporator fan 21 and the compressor 1 according to the value of the return air temperature T1, and to control the start, stop, and operation mode of the condensing fan 15 and the circulating water pump 12 according to the value of the condensing temperature T2.

[0060] Specifically, before the air-conditioning system works, the set temperature of the air-conditioning is preset manually according to actual needs, that is, the refrigeration temperature of the air-conditioning is Ta; at the same time, the condensing temperature of the air-conditioning system is preset. In the present invention, the condensing temperature is divided into three gears, including the low-grade condensing temperature of Tc1, the medium-grade condensing temperature of Tc2, and the high-grade condensing temperature of Tc3. There are default values of the three gears of condensing temperature in the air-conditioning system, or the values of the three gears of condensing temperature can also be set manually. It should be noted that both the system default value and the manually set value satisfy Ta < Tc1 < Tc2 < Tc3. For example, the value range of Ta is between 16~32°C, the value range of Tc1 is between 30~38°C, the value range of Tc2 is between 38~46°C, and the value range of Tc3 is between 46~54°C.

[0061] After the return air temperature sensor 20 transmits the return air temperature T1 to the controller, if the value of T1 is lower than or equal to Ta, the air temperature in the kitchen does not exceed the preset cooling temperature, and the air conditioning system does not operate. When the value of T1 exceeds Ta, the air temperature in the kitchen exceeds the preset cooling temperature, and the air conditioning system automatically starts operating, with the evaporator fan 21 and compressor 1 starting to work. The operation of compressor 1 causes the refrigerant to circulate in the pipeline. After entering the condenser 2, the refrigerant flows along the heat exchange coil 9 to dissipate heat and achieve cooling. The refrigerant absorbs heat from the kitchen in the evaporator 5, and the operation of evaporator fan 21 accelerates the flow of cold air in the kitchen, improving cooling efficiency. Specifically, the air conditioning system is controlled to operate in the following modes:

[0062] When the value of T2 does not exceed Tc1, the condensation temperature T2 of the refrigerant is relatively low, indicating that the refrigerant can achieve the cooling purpose simply by naturally dissipating heat through the heat exchange coil 9. At this time, the air temperature in the kitchen is slightly higher than the preset cooling temperature, and the air conditioning system operates in cooling mode, but only the evaporator fan 21 and compressor 1 need to maintain operation to achieve the cooling purpose.

[0063] When the value of T2 exceeds Tc1 but does not exceed Tc2, the condensing temperature T2 of the refrigerant rises to near the medium level, indicating that the refrigerant can no longer achieve the cooling purpose through natural heat dissipation within the heat exchange coil 9. At this time, the air temperature in the kitchen is significantly higher than the preset cooling temperature, and the air conditioning system requires greater operating power for cooling. Therefore, in addition to the evaporator fan 21 and compressor 1 maintaining their operating status, the condenser fan 15 needs to start operating to achieve the cooling purpose.

[0064] After the condenser fan 15 starts running, it will generate negative pressure in the first chamber 22 and the second chamber 23, so that the air in the kitchen enters the first chamber 22 from the first air inlet 7 and the second air inlet 10. The air entering the condenser 2 from the first air inlet 7 quickly passes through the heat exchange coil 9 and air-cools the heat exchange coil 9, using the sensible heat of the air to accelerate the cooling of the heat exchange coil 9.

[0065] Specifically, within the temperature range of Tc1 to Tc2, the higher the actual condensing temperature T2, the greater the required cooling airflow, resulting in a faster rotation speed and higher power of the condenser fan 15. Therefore, within the speed regulation range of the condenser fan 15 corresponding to the temperature range of Tc1 to Tc2, the rotation speed of the condenser fan 15 is linearly proportional to the actual condensing temperature T2, and the speed regulation method of the condenser fan 15 is stepless.

[0066] When the value of T2 exceeds Tc2 but does not exceed Tc3, the refrigerant condensing temperature T2 rises to near the high-end level, indicating that the refrigerant cannot achieve cooling through air cooling via the condenser fan 15 alone. At this time, the air temperature in the kitchen is much higher than the preset cooling temperature, and the air conditioning system requires greater operating power for cooling. Therefore, in addition to the evaporator fan 21 and compressor 1 maintaining operation, both the condenser fan 15 and the circulating water pump 12 need to start operating to achieve the cooling purpose.

[0067] The circulating water pump 12 continuously pumps the medium water in the water tank 13 into the spray mechanism 8. The spray mechanism 8 evenly sprays the medium water onto the heat exchange coil 9. The medium water exchanges heat with the refrigerant through the heat exchange coil 9, causing the temperature of the medium water to rise, and some of the medium water absorbs heat and vaporizes. The air entering the condenser 2 from the first air inlet 7 not only air-cools the heat exchange coil 9 after passing through the heat exchange coil 9, but also accelerates the vaporization of the medium water by accelerating evaporation. This achieves the effect of simultaneously utilizing the sensible heat of the air, the sensible heat of the water, and the latent heat of the water to cool the heat exchange coil 9, thus significantly improving the cooling efficiency.

[0068] Specifically, within the temperature range of Tc2 to Tc3, the higher the actual condensing temperature T2, the greater the required cooling airflow and medium water flow, resulting in faster rotation speeds of the condenser fan 15 and circulating water pump 12, and higher power output for both. However, since adjusting the rotation speeds of both the condenser fan 15 and the circulating water pump 12 affects the condensing temperature T2, and the combined effect of these two adjustments on reducing T2 is non-linear compared to controlling either the rotation speed of the condenser fan 15 or the circulating water pump 12 individually, the controller employs fuzzy control to control the rotation speeds of the condenser fan 15 and the circulating water pump 12 within the speed ranges corresponding to Tc2 to Tc3. Fuzzy control is a computer digital control technology based on fuzzy set theory, fuzzy linguistic variables, and fuzzy logic reasoning, commonly used to control systems with numerous and complex variables.

[0069] When the value of T2 exceeds Tc3, the condensing temperature T2 of the refrigerant rises to its highest level, indicating that the refrigerant urgently needs heat dissipation and cooling. At this time, the air temperature in the kitchen is much higher than the preset cooling temperature, and the air conditioning system needs to operate at its maximum power for cooling. Therefore, while the evaporator fan 21 and compressor 1 are maintaining their operating status, the condenser fan 15 and circulating water pump 12 also need to start operating at their highest speed for cooling.

[0070] During this process, the heated medium water in the heat exchange coil 9 naturally falls onto the packing 14 under the action of gravity. The air entering the condenser 2 from the first air inlet 7 and the generated steam also pass through the packing 14 under the action of negative pressure. The heated medium water, the heated air, and the generated steam exchange heat with the air entering the first cavity 22 from the second air inlet 10 at the packing 14, which cools the medium water and thus lowers the temperature of the medium water in the water tank 13. This releases the sensible heat in the heated medium water, which is beneficial for the cooling of the heat exchange coil 9 by the medium water during circulation.

[0071] Furthermore, the cooling on the packing 14 liquefies the generated water vapor, and the liquefied medium water falls back into the water tank 13 to participate in water circulation, reducing water consumption. All air passing through the packing 14 can only enter the second chamber 23 from below after heat exchange. The air outlet 24 of the condenser 2 is located at the top of the second chamber 23. The heated air rises naturally and is quickly discharged from the air outlet 24. During this process, the medium water formed by the cooling and liquefaction of the air mixed with some water vapor can still fall naturally into the water tank 13 under the action of gravity, so as to maximize the recovery of medium water and reduce water consumption.

[0072] By embedding the control logic of the control method for all operating modes of the air conditioning system in this invention into the software of the built-in or external controller or control device, the automated and intelligent control of the energy-saving kitchen air conditioning system in this invention can be achieved.

[0073] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if these modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include these modifications and modifications.

Claims

1. An energy-saving kitchen air conditioning system, comprising a compressor (1), a condenser (2), a throttling device (4), and an evaporator (5) connected by pipes, wherein refrigerant circulates along the pipes, characterized in that, An evaporator fan (21) for accelerating the evaporation of the refrigerant is provided on the evaporator (5), and a return air temperature sensor (20) for measuring the return air temperature T1 is provided at the air inlet of the evaporator (5). A condensing temperature sensor (19) for measuring the condensing temperature T2 of the refrigerant is provided on the pipeline where the refrigerant flows out from the condenser (2). A condensing fan (15) and a circulating water system are provided in the condenser (2). Both the condensing fan (15) and the circulating water system are used to cool the refrigerant in the condenser (2). The circulating water system is driven by a circulating water pump (12). An air inlet and an air outlet (24) are provided on the condenser (2). When the condensing fan (15) operates, air enters the condenser (2) from the air inlet. The air inlet includes a first air inlet (7) and a second air inlet (10). A first cavity (22) and a second cavity (23) are provided in the condenser (2). Both the first air inlet (7) and the second air inlet (10) are provided on the first cavity (22). The lower part of the first cavity (22) is communicated with the second cavity (23). The condenser (2) further includes a filler (14). The air in the first cavity (22) enters the second cavity (23) after passing through the filler (14). The air outlet (24) is located at the top of the second cavity (23).

2. The energy-saving kitchen air conditioning system according to claim 1, characterized in that, A heat exchange coil (9) for the refrigerant to flow through and exchange heat is provided in the condenser (2). The circulating water system further includes a spraying mechanism (8) and a water tank (13). The spraying mechanism (8) sprays medium water onto the heat exchange coil (9). The water tank (13) is located at the bottom of the condenser (2) so that the medium water dripping from the heat exchange coil (9) falls into the water tank (13). The circulating water pump (12) pumps the medium water in the water tank (13) into the spraying mechanism (8). After the air enters the condenser (2), it passes through the heat exchange coil (9) and cools the heat exchange coil (9).

3. A control method for an energy-saving kitchen air conditioning system, characterized in that, For controlling the energy-saving kitchen air-conditioning system as claimed in claim 1 or 2, start and stop the evaporator fan (21) and the compressor (1) according to the value of the return air temperature T1, and start and stop the condensing fan (15) and the circulating water pump (12) and their operating modes according to the value of the condensing temperature T2.

4. The control method for the energy-saving kitchen air conditioning system according to claim 3, characterized in that, The preset air-conditioning set temperature is Ta, the preset low-grade condensing temperature is Tc1, the medium-grade condensing temperature is Tc2, and the high-grade condensing temperature is Tc3, and Ta < Tc1 < Tc2 < Tc3. When the value of T1 exceeds Ta, the evaporator fan (21) and the compressor (1) start to operate, otherwise they do not operate.

5. The control method for the energy-saving kitchen air conditioning system according to claim 4, characterized in that, When the value of T2 does not exceed Tc1, the evaporator fan (21) and the compressor (1) maintain their operating states.

6. The control method for the energy-saving kitchen air conditioning system according to claim 4, characterized in that, When the value of T2 exceeds Tc1 but does not exceed Tc2, the evaporator fan (21) and the compressor (1) maintain their operating states, and at the same time the condensing fan (15) starts to operate.

7. The control method for the energy-saving kitchen air conditioning system according to claim 6, characterized in that, The condensing fan (15) operates at a linear proportional speed regulation within the speed regulation range corresponding to the temperature range from Tc1 to Tc2.

8. The control method for the energy-saving kitchen air conditioning system according to claim 4, characterized in that, When the value of T2 exceeds Tc2 but does not exceed Tc3, the evaporator fan (21) and compressor (1) maintain operation, while the condenser fan (15) and circulating water pump (12) start to run.

9. The control method for the energy-saving kitchen air conditioning system according to claim 8, characterized in that, The condenser fan (15) and the circulating water pump (12) operate in a fuzzy control mode within the speed regulation range corresponding to the temperature range of Tc2 to Tc3.

10. The control method for the energy-saving kitchen air conditioning system according to claim 4, characterized in that, When the value of T2 exceeds Tc3, the evaporator fan (21) and compressor (1) remain in operation, while the condenser fan (15) and circulating water pump (12) operate at their highest speed.

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