Waste heat recycling device of air conditioning system

Abstract

The utility model belongs to the field of renewable energy sources, and particularly relates to a waste heat recycling device of an air conditioning system, which comprises a heat exchanger, a heat storage water tank, a heat storage water tank controller, a first circulating pump and a first circulating pump controller, the heat exchanger, the heat storage water tank and the first circulating pump are sequentially connected to form a waste heat recovery loop; wherein a cold fluid inlet of the heat exchanger is connected with a fluid outlet of the heat storage water tank through a first circulating pump, and the first circulating pump is electrically connected with a first circulating pump controller; a cold fluid outlet of the heat exchanger is connected with a fluid inlet of the heat storage water tank; a hot fluid inlet of the heat exchanger is connected with a fluid outlet of the compressor, and a hot fluid outlet of the heat exchanger is connected with a fluid inlet of the condenser. The device can improve the utilization rate of energy conversion and can store heat more effectively.

Description

Technical Field

[0001] The utility model belongs to the field of renewable energy, in particular to a waste heat recovery and utilization device of an air conditioning system. Background Art

[0002] Taking into account issues such as improving energy utilization efficiency and reducing environmental pollution and carbon emissions, and responding to my country's policy requirements to promote green and low-carbon transformation and build a modern economic system, the application of waste heat recovery equipment in air-conditioning systems in the field of renewable energy will be widely promoted, such as: wind power generation, solar energy, hydropower, biomass energy, geothermal energy, energy Internet and smart grid, construction and other fields.

[0003] Although some progress has been made in energy recovery systems, in some cases, the efficiency of energy capture and conversion is still not high enough, resulting in a large amount of waste energy not being effectively utilized; some waste heat recovery technologies, especially those involving complex equipment and technology integration, may face high costs and technical challenges. This limits the widespread application of these technologies; although thermal energy storage technology has achieved certain success, how to effectively store and distribute large amounts of thermal energy remains a challenge. In addition, energy storage methods such as battery technology and fuel storage also have similar problems; different waste heat recovery technologies usually need to be integrated with existing energy systems and equipment. However, due to the diversity of these technologies and the lack of unified standards, system integration can become complex and costly.

[0004] In summary, although waste heat recovery equipment and related technologies have made certain progress in many aspects, they still face many challenges and limitations. In order to promote the further development of these technologies, continuous research and innovation are needed. Utility Model Content

[0005] The utility model aims to provide a waste heat recovery and utilization device for an air conditioning system, which can improve the utilization rate of energy conversion and can store heat more effectively.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A waste heat recovery device for an air conditioning system, the waste heat recovery device comprising a heat exchanger, a hot water storage tank, a hot water storage tank controller, a first circulation pump and a first circulation pump controller;

[0008] The heat exchanger, the hot water storage tank and the first circulation pump are connected in sequence to form a waste heat recovery loop; wherein the cold fluid inlet of the heat exchanger is connected to the fluid outlet of the hot water storage tank through the first circulation pump, and the first circulation pump is electrically connected to the first circulation pump controller; the cold fluid outlet of the heat exchanger is connected to the fluid inlet of the hot water storage tank;

[0009] The hot fluid inlet of the heat exchanger is connected to the fluid outlet of the compressor, and the hot fluid outlet of the heat exchanger is connected to the fluid inlet of the condenser;

[0010] A temperature sensor is arranged in the hot water storage tank, and the temperature sensor is connected with a hot water storage tank controller to control the temperature of the hot water storage tank.

[0011] Preferably, the heat exchanger is a floating head heat exchanger, and its heat transfer tube is serpentine.

[0012] Preferably, a compensation ring is provided on the heat exchanger, and its heat transfer tube is made of copper alloy.

[0013] Preferably, a speed meter is provided in the heat exchanger, and the heat exchanger is a countercurrent or nearly countercurrent mixed flow type heat exchanger.

[0014] Preferably, the anemometer is selected from a Pitot tube flowmeter, a rotor flowmeter or an ultrasonic flowmeter.

[0015] Preferably, the hot water storage tank controller adopts a PID regulator.

[0016] Preferably, the heat storage tank is made of 304 stainless steel or 316 stainless steel.

[0017] Furthermore, the waste heat recovery and utilization device also includes an evaporator, a second circulating pump, a cooling tower, a refrigeration pump and a coil. The evaporator, the refrigeration pump and the coil are connected in sequence to form a refrigeration circuit, the condenser, the second circulating pump and the cooling tower are connected in sequence to form a cooling circuit, and the evaporator, the compressor, the heat exchanger and the condenser are connected in sequence to form a heat pump system.

[0018] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0019] The utility model improves the equipment, for example, a flow rate monitoring device can be added inside the heat exchanger (such as a pitot tube flowmeter, a rotor flowmeter, an ultrasonic flowmeter, etc.) to ensure that the flow rate in the heat exchanger is moderate, which can significantly improve the heat exchange efficiency; the utility model improves the structure of the heat exchanger, such as using a heat exchanger structure with low heat transfer resistance or changing the aspect ratio of the heat exchanger, which can also reduce the thermal resistance and improve the heat transfer efficiency; the utility model selects materials with high thermal conductivity, strong corrosion resistance and good thermal stability (for example, copper alloy can be used, although its price is relatively high, its thermal conductivity is nearly 30% higher than that of aluminum), which can significantly improve the performance of the heat exchanger. These materials can provide better heat conduction efficiency and extend the service life of the heat exchanger, thereby improving the energy conversion rate; the utility model optimizes the internal structure design of the heat exchanger, and improves its performance by changing the structural parameters of the heat exchanger, optimizing the fluid flow mode, etc. For example, increasing the curvature of the flow channel can increase the flow path of the fluid and improve the heat exchange effect. In addition, optimizing the matching of heat exchange area and heat transfer coefficient can also improve heat exchange efficiency. The heat exchanger of the utility model can consider adopting a mixed flow type of countercurrent or near countercurrent, or a mixed heat exchanger of countercurrent, so as to increase the temperature of the hot side fluid and reduce the temperature of the cold side fluid as much as possible, thereby increasing the logarithmic mean temperature difference and thus improving the heat exchange efficiency.

[0020] The utility model improves the energy conversion rate by improving the heat exchanger device, and the energy conversion rate is improved by about 30% compared with that before the improvement.

[0021] The utility model adopts stainless steel with a large heat storage coefficient as the material of the hot water storage tank, such as 304 stainless steel or 316 stainless steel, to achieve a better heat storage effect; the utility model introduces an intelligent control system into the original hot water storage tank, which can achieve accurate control of the temperature and flow of the hot water storage tank by automatically adjusting pumps, valves and other equipment (for example, a temperature sensor can be installed in the hot water storage tank, and the temperature can be accurately controlled by using a PID regulator), further improving the energy storage efficiency; in addition, regular maintenance, inspection and cleaning of the hot water storage tank are also the key to ensuring its efficient operation. By removing scale, replacing aging parts and other measures, the hot water storage tank can be kept in good working condition, thereby improving its energy storage performance.

[0022] The utility model combines the thermal energy storage technology with the energy recovery technology, can achieve the coordinated optimization of the two, and store the recovered waste thermal energy for later use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the waste heat recovery and utilization device of the utility model;

[0024] Figure 2It is a structural schematic diagram of the heat exchanger of the utility model;

[0025] Figure numerals: 1. heat exchanger; 2. hot water storage tank; 3. first circulation pump; 4. first circulation pump controller; 5. hot water storage tank controller; 6. temperature sensor; 7. evaporator; 8. compressor; 9. condenser; 10. second circulation pump; 11. cooling tower; 12. refrigeration pump; 13. coil; 14. three-way valve; 15. expansion valve; 1-1. cold fluid inlet; 1-2. cold fluid outlet; 1-3. hot fluid inlet; 1-4. hot fluid outlet; 1-5. compensation ring; 1-6. tachometer; 1-7. heat transfer tube. DETAILED DESCRIPTION

[0026] The technical solution of the utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0027] Example 1

[0028] like Figure 1-2 As shown, a waste heat recovery device for an air conditioning system includes a heat exchanger 1, a hot water storage tank 2, a hot water storage tank controller 5, a first circulation pump 3 and a first circulation pump controller 4;

[0029] The heat exchanger 1, the hot water storage tank 2 and the first circulation pump 3 are connected in sequence to form a waste heat recovery loop; wherein the cold fluid inlet 1-1 of the heat exchanger 1 is connected to the fluid outlet of the hot water storage tank 2 through the first circulation pump 3, and the first circulation pump 3 is electrically connected to the first circulation pump controller 4; the cold fluid outlet 1-2 of the heat exchanger 1 is connected to the fluid inlet of the hot water storage tank 2;

[0030] The hot fluid inlet 1-3 of the heat exchanger 1 is connected to the fluid outlet of the compressor 8, and the hot fluid outlet 1-4 of the heat exchanger 1 is connected to the fluid inlet of the condenser 9;

[0031] The hot water storage tank 2 is provided with a temperature sensor 6 , which is connected to a hot water storage tank controller 5 to control the temperature of the hot water storage tank 2 .

[0032] The heat exchanger 1 is a floating head heat exchanger, and its heat transfer tubes 1-7 are serpentine.

[0033] The heat exchanger 1 is provided with a compensation ring 1-5, and its heat transfer tube 1-7 is made of copper alloy.

[0034] The heat exchanger 1 is provided with anemometers 1-6, and the heat exchanger is a countercurrent or nearly countercurrent mixed flow type heat exchanger.

[0035] The velocimeters 1-6 are Pitot tube flowmeters.

[0036] The first circulation pump controller 4 and the hot water storage tank controller 5 use PID regulators. The hot water storage tank 2 is made of 304 stainless steel or 316 stainless steel.

[0037] The waste heat recovery and utilization device also includes an evaporator 7, a second circulation pump 10, a cooling tower 11, a refrigeration pump 12 and a coil 13. The evaporator 7, the refrigeration pump 12 and the coil 13 are connected in sequence to form a refrigeration circuit; in the refrigeration circuit, the fluid outlet of the coil 13 is connected to the fluid inlet of the refrigeration pump 12, the fluid outlet of the refrigeration pump 12 is connected to the fluid inlet of the evaporator 7, and the fluid outlet of the evaporator 7 is connected to the fluid inlet of the coil 13. In the refrigeration circuit, a three-way valve 14 is arranged before the fluid inlet of the coil 13, and the three-way valve 14 is connected to the fluid outlet of the coil 13 through a pipeline and a valve arranged on the pipeline.

[0038] The condenser 9, the second circulating pump 10, and the cooling tower 11 are connected in sequence to form a cooling circuit; in the cooling circuit, the fluid outlet of the cooling tower 11 is connected to the fluid inlet of the second circulating pump 10, the fluid outlet of the second circulating pump 10 is connected to the fluid inlet of the condenser 9, and the fluid outlet of the condenser 9 is connected to the fluid inlet of the cooling tower 11.

[0039] The evaporator 7, the compressor 8, the heat exchanger 1 and the condenser 9 are connected in sequence to form a heat pump system. In the heat pump system, an expansion valve 15 may also be included, and the expansion valve 15 is arranged on the pipeline connecting the condenser 9 and the evaporator 7. In the heat pump system, the fluid outlet of the evaporator is connected to the fluid inlet of the compressor, the fluid outlet of the compressor is connected to the hot fluid inlet of the heat exchanger, the hot fluid outlet of the heat exchanger is connected to the fluid inlet of the condenser, the fluid outlet of the condenser is connected to the fluid inlet of the expansion valve, and the fluid outlet of the expansion valve is connected to the fluid inlet of the evaporator.

[0040] The appearance of the hot water storage tank 2 is a stainless steel shell. A temperature sensor is installed on the tank body, and PID regulation is adopted to more accurately control the temperature inside the tank body.

[0041] The functions of each component are as follows:

[0042] 1. Evaporator 7: The low-temperature condensed gas passes through the evaporator, exchanges heat with the outside air, and absorbs heat to achieve a refrigeration effect;

[0043] 2. Second circulation pump 10, refrigeration pump 12: Pumps are usually used to lift liquid, transport liquid or increase liquid pressure, that is, to convert the mechanical energy of the prime mover into liquid energy to achieve the purpose of pumping liquid. The pump in the utility model mainly provides power to the circuit so that the circuit can operate normally.

[0044] 3. Coil 13: The coil is a component in the fan coil unit. The fan coil unit also includes a fan, a controller and a housing. It is one of the core components of the central air conditioning system and is mainly responsible for adjusting the indoor temperature and humidity to provide a comfortable indoor environment. The coil is the core part of the fan coil unit and is mainly used for heat exchange; the fan is responsible for driving the air flow to increase the heat exchange efficiency; the controller is used to adjust the temperature and humidity to ensure the indoor air comfort; the housing protects the internal components and also has an aesthetic effect.

[0045] The air conditioning system of the utility model comprises a waste heat recovery circuit, a refrigeration circuit, a cooling circuit and a heat pump system.

[0046] The utility model adds a tachometer to the heat exchanger, which can accurately control the speed of cold and hot fluids, thereby improving the efficiency of the heat exchanger; the heat transfer pipe of the heat exchanger adopts a copper pipe to enhance heat exchange; the heat exchanger adds a compensation ring to adapt to the different thermal expansion degrees of the shell and the pipe, thereby increasing the application range of the heat exchanger.

[0047] In summer, when the air conditioner is running for cooling, it must emit a large amount of condensation heat to the outside world through condensation. At present, most air conditioners do not make effective use of this part of heat when designing, but directly discharge it into the atmosphere. For example, the air-cooled unit directly discharges a large amount of heat to the outside world through the fan and the water-cooled unit discharges a large amount of heat through the cooling tower. Due to the machine efficiency of the host and the power factor of the motor, the heat emitted is about 120% of the cooling capacity. Therefore, the heat recovery technology of the utility model uses this part of heat to obtain hot water and realizes the purpose of air conditioning heat reuse. It is improved on the original air conditioning unit and an efficient waste heat recovery device is installed on the air conditioning unit. The device makes the high-temperature refrigerant exchange heat with tap water, converts the waste heat discharged into the atmosphere into renewable energy for secondary use, and produces domestic hot water and heating functions for free. At present, the water temperature in the industry can reach 55-60℃, while the water temperature in the water storage tank of the utility model can reach 70-100℃.

[0048] Any content not described in detail in the present invention can be based on the conventional technical knowledge in the field.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the embodiments, a person skilled in the art should understand that any modification or equivalent replacement of the technical solution of the utility model does not deviate from the spirit and scope of the technical solution of the utility model, and should be included in the scope of the claims of the utility model.

Claims

1. A waste heat recovery device for an air conditioning system, characterized in that: The waste heat recovery and utilization device includes a heat exchanger, a hot water storage tank, a hot water storage tank controller, a first circulation pump and a first circulation pump controller; The heat exchanger, the hot water storage tank and the first circulation pump are connected in sequence to form a waste heat recovery loop; wherein the cold fluid inlet of the heat exchanger is connected to the fluid outlet of the hot water storage tank through the first circulation pump, and the first circulation pump is electrically connected to the first circulation pump controller; the cold fluid outlet of the heat exchanger is connected to the fluid inlet of the hot water storage tank; The hot fluid inlet of the heat exchanger is connected to the fluid outlet of the compressor, and the hot fluid outlet of the heat exchanger is connected to the fluid inlet of the condenser; A temperature sensor is arranged in the hot water storage tank, and the temperature sensor is connected with a hot water storage tank controller to control the temperature of the hot water storage tank.

2. The waste heat recovery device for an air conditioning system according to claim 1, characterized in that: The heat exchanger is a floating head heat exchanger, and its heat transfer tube is serpentine.

3. The waste heat recovery device for an air conditioning system according to claim 1, characterized in that: A compensation ring is arranged on the heat exchanger, and the heat transfer tube thereof is made of copper alloy.

4. The waste heat recovery device for an air conditioning system according to claim 1, characterized in that: A temometer is arranged in the heat exchanger, and the heat exchanger is a countercurrent heat exchanger, a parallel flow heat exchanger or a parallel-countercurrent mixed flow heat exchanger.

5. The waste heat recovery device for an air conditioning system according to claim 4, characterized in that: The velocimeter is selected from a Pitot tube flowmeter, a rotor flowmeter or an ultrasonic flowmeter.

6. The waste heat recovery device for an air conditioning system according to claim 1, characterized in that: The hot water storage tank controller adopts a PID regulator.

7. The waste heat recovery device for an air conditioning system according to claim 1, characterized in that: The heat storage tank is made of 304 stainless steel or 316 stainless steel.

8. The waste heat recovery device for an air conditioning system according to claim 1, characterized in that: The waste heat recovery and utilization device also includes an evaporator, a second circulating pump, a cooling tower, a freezing pump and a coil. The evaporator, the freezing pump and the coil are connected in sequence to form a refrigeration circuit, the condenser, the second circulating pump and the cooling tower are connected in sequence to form a cooling circuit, and the evaporator, the compressor, the heat exchanger and the condenser are connected in sequence to form a heat pump system.

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