Energy-saving and efficient dehumidification device
By introducing a circulating heat exchange mechanism and PLC control system into the dehumidification device, the problems of low dehumidification efficiency and high energy consumption in low humidity environments are solved, and the dehumidification efficiency and energy consumption are improved.
Patent Information
- Application Number
- CN202420787812.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-16
AI Technical Summary
The existing condensation dehumidifiers have low dehumidification efficiency and high energy consumption in low humidity environments. Especially when the relative humidity exceeds 30%, the dehumidification amount is significantly reduced, resulting in uneconomical equipment.
The circulating heat exchange mechanism is introduced into the dehumidification device, including the front and rear meter coolers, and the refrigerant is circulated in the heat exchanger through the circulating pump, and the power of the fan and circulating pump is adjusted in combination with the PLC controller and the temperature sensor. Reduce the air temperature at the front end of the evaporator and improve the moisture condensation efficiency.
The dehumidification efficiency is significantly improved and energy consumption is reduced. Especially in low-humidity environments, the dehumidification amount doubles, reaching or exceeding the average maximum dehumidification amount of dehumidifiers on the market, and the energy consumption is significantly reduced.
Smart Images
Figure CN222210584U_ABST
Abstract
Description
Technical field:
[0001] The utility model relates to the technical field of dehumidification equipment manufacturing, in particular to an energy-saving and high-efficiency dehumidification device which can significantly improve dehumidification efficiency and reduce energy consumption. Background technology:
[0002] As we all know, a dehumidifier based on a condensing mechanism draws in humid air, drives a heat exchanger (evaporator and condenser) through a compressor, condenses the moisture in the air into water droplets, and then discharges the treated and dried warm air out of the machine. This cycle reduces the indoor humidity. Normally, when the ambient temperature is 30°C, the relative humidity of 30% is the limit of a condensing dehumidifier, and when the ambient humidity is below 40%, dehumidification is extremely uneconomical. Table 1 lists the nominal dehumidification capacity of several commonly used dehumidifiers on the market. This dehumidification capacity is generally measured in an environment with a temperature of 30 degrees and a relative humidity of 80%.
[0003] Table 1
[0004]
[0005]
[0006] If the power of the dehumidification equipment is 10Kw, the heat transfer efficiency of the compressor is 3.0, and the temperature of the air after passing through the evaporator is controlled at different humidity levels at 30 degrees, the theoretical dehumidification capacity is shown in Table 2:
[0007] At 30 degrees, the theoretical dehumidification capacity per hour (Kg / h) Table 2
[0008]
[0009] By comparing the data in Table 1 and Table 2, the nominal maximum dehumidification capacity of dehumidifiers on the market is basically consistent with the theoretical calculation capacity. The high and low dehumidification capacity is mainly related to the heat transfer efficiency of the selected compressor or the dehumidification environment. Further analysis of the data in Table 2 can reveal the following two points: (1) The dehumidification capacity is particularly correlated with the relative humidity of the air.
[0010] (2) When the relative humidity is low, the lower the air temperature passing through the evaporator, the more conducive it is to dehumidification.
[0011] The condensing dehumidifiers sold on the market generally have a relative humidity limit of 30% when the ambient temperature is 30°C, and under this condition, the dehumidification efficiency is particularly low. According to theoretical calculations, when the relative humidity is 40%, the theoretical dehumidification capacity is only half of the maximum dehumidification capacity, and when the relative humidity is 30%, the theoretical dehumidification capacity is only 1 / 3 of the maximum dehumidification capacity.
[0012] This is mainly determined by the condensation dehumidification principle. The principle is to lower the air temperature as a whole so that the air moisture content is greater than the saturated humidity, and the moisture in the air condenses into tiny beads, which are then adsorbed on the fins of the evaporator and bleed out.
[0013] In the process, there are two main energy consumptions: one is the cooling of the air, which releases a large amount of heat energy; the other is the condensation of moisture in the air, which releases a large amount of condensation heat.
[0014] When the condensing dehumidifier is working, there is a large temperature difference between the air before and after the evaporator.
[0015] Now add a heat exchange device, set up heat exchangers before and after the evaporator, and use the "cold energy" at the rear end of the evaporator to cool the hot air at the front end of the evaporator. It can reduce the temperature of the air entering the evaporator. Relatively reduce the proportion of energy consumption used by the evaporator to cool the air, and increase the proportion of energy consumption used for water condensation. Therefore, it can significantly increase the dehumidification capacity and improve the dehumidification efficiency.
[0016] Now assume a working condition, at 30 degrees room temperature, through the installed heat exchange device, the air temperature at the front of the evaporator is cooled to "the temperature at the rear of the evaporator + 10 degrees" (that is, the temperature difference between the air before and after the evaporator is 10 degrees). At different dehumidification temperatures, the theoretical dehumidification capacity is as follows:
[0017] Dehumidification capacity per hour (Kg / h) (air temperature difference before and after the evaporator is 10 degrees) Table 3
[0018]
[0019] (Note: The compressor power is 10KW and the heat transfer efficiency is 3.0.)
[0020] For the data in Table 2 and Table 3, the maximum dehumidification capacity increased by 40%, and under low humidity conditions, the dehumidification capacity doubled. When the dehumidification temperature was 0-4 degrees and the relative humidity was 40%, the average maximum dehumidification capacity of dehumidifiers on the market was reached. Summary of the invention:
[0021] The utility model aims at the shortcomings and deficiencies existing in the prior art: high dehumidification energy consumption and low efficiency at low humidity, and proposes an energy-saving and high-efficiency dehumidification device which can significantly improve the dehumidification efficiency and reduce energy consumption.
[0022] The utility model achieves this through the following measures:
[0023] An energy-saving and efficient dehumidification device is provided with an evaporator, a compressor, a condenser and a fan located in a dehumidification space, wherein the compressor is connected to the evaporator and the condenser via pipelines, respectively. The invention is characterized in that a circulating heat exchange mechanism is also provided, wherein the circulating heat exchange mechanism comprises a front-end heat exchanger arranged at the front end of the evaporator and a rear-end heat exchanger arranged at the rear end of the evaporator, the front-end heat exchanger and the rear-end heat exchanger are connected via pipelines, and a circulating pump is provided on the pipeline, the front-end heat exchanger and the rear-end heat exchanger are filled with liquid refrigerant, and the refrigerant is circulated in the front-end heat exchanger and the rear-end heat exchanger via the circulating pump.
[0024] The front-end heat exchanger and the rear-end heat exchanger of the utility model are both realized by a surface cooler, and the surface cooler is provided with heat dissipation fins and branch coil pipelines, a liquid inlet manifold, and a liquid outlet manifold, and each branch coil pipeline is in the same horizontal plane and is connected between the liquid inlet manifold and the liquid outlet manifold; further, a throttling structure is provided at the connection between one end of each branch coil pipeline and the manifold (the liquid inlet manifold or the liquid outlet manifold), and the throttling structure is a throttling tube with a pipe diameter smaller than the inner diameter of the branch coil pipeline; or, a throttling hole is provided in the throttling structure: the throttling hole is opened at the end of the branch coil pipeline, and the end of the branch coil pipeline with the throttling hole is extended into the manifold The branch coil pipeline and the confluence pipe are welded at the connection point; or the throttling hole is opened on the confluence pipe wall, the throttling hole diameter is smaller than the inner diameter of the branch coil pipeline, and the branch coil pipeline is welded on the outside of the throttling hole of the confluence pipe. The throttling structure causes a large pressure difference between the confluence pipe and the branch coil pipeline, so that the refrigerant is evenly distributed to each branch coil pipeline to prevent the refrigerant from taking shortcuts in the cooler, causing uneven cooling and heating of various parts of the cooler, reducing efficiency, and causing trouble for control; further, the liquid in the cooler tube enters from the rear end, flows to the front end and then converges into the confluence pipe. The flow direction of the fluid in the cooler is opposite to the flow direction of the air, which is used to improve the heat exchange efficiency of the cooler.
[0025] A throttling structure is provided at the connection between one end of the branch coil pipeline and a manifold (ie, a liquid inlet manifold or a liquid outlet manifold), and the throttling structure is a throttling tube whose diameter is smaller than the inner diameter of the branch coil pipeline.
[0026] The utility model provides a throttling structure at the connection between one end of the branch coil pipeline and the confluence pipe (i.e., the liquid inlet confluence pipe or the liquid outlet confluence pipe), wherein the throttling structure is provided with a throttling hole, and the throttling hole is opened at the end of the branch coil pipeline. The end of the branch coil pipeline with the throttling hole is extended into the confluence pipe, and the connection between the branch coil pipeline and the confluence pipe is well welded.
[0027] A throttling structure is provided at the connection between one end of the branch coil pipeline and the manifold (i.e., the liquid inlet manifold or the liquid outlet manifold). The throttling structure is realized by opening a throttling hole on the wall of the manifold. The diameter of the throttling hole is smaller than the inner diameter of the branch coil pipeline. The branch coil pipeline is welded on the outside of the throttling hole of the manifold.
[0028] The utility model is also provided with a fan circulation pump control circuit connected to the fan and the circulation pump, the circulation pump control circuit includes a PLC controller, a front temperature sensor, and a rear temperature sensor, the front temperature sensor is used to collect the temperature data of the air inlet side of the evaporator, and the rear temperature sensor is used to collect the ambient temperature data of the air outlet side of the evaporator, the PLC controller is respectively connected to the front temperature sensor, the rear temperature sensor, the fan, and the circulation pump, and the operating power of the fan and the circulation pump is adjusted by collecting the temperature of the front and rear ends of the evaporator and analyzing and processing. The temperature sensor is implemented by a thermocouple.
[0029] When the utility model is working, the temperature of the front and rear ends of the evaporator is collected by the controller, and after analysis and processing, the operating power of the fan and the circulation pump is adjusted to achieve the goal of reducing the air temperature at the front end of the evaporator as much as possible under a certain dehumidification temperature, thereby greatly reducing the power consumption of the evaporator for cooling the air and using more energy for water condensation; compared with the prior art, it has the significant advantages of low energy consumption and high dehumidification efficiency. Description of the drawings:
[0030] Attached Figure 1 It is a structural schematic diagram of the utility model.
[0031] Attached Figure 2 It is a schematic diagram of the top view of the surface cooler in the utility model.
[0032] Attached Figure 3 It is a schematic diagram of the structure of the throttling structure between the confluence pipe and the branch coil pipeline in the present invention, 3(a) is a schematic diagram of the throttling structure with a throttling pipe, 3(b) is a schematic diagram of the throttling structure of the opening structure at the end of the branch coil pipeline, and 3(c) is a schematic diagram of the throttling structure of the confluence pipe opening structure.
[0033] Figure numerals: evaporator 1, compressor 2, condenser 3, fan 4, front-end heat exchanger 5, rear-end heat exchanger 6, circulation pump 7, heat dissipation fins 8, liquid inlet manifold 9, liquid outlet manifold 10, branch coil pipeline 11, throttle hole 12, throttle tube 13, PLC controller 14, front-end temperature sensor 15, rear-end temperature sensor 16, manifold 17. Specific implementation method:
[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0035] Example:
[0036] As attached Figure 1 As shown, this example provides an energy-saving and efficient dehumidification device, which is provided with an evaporator 1, a compressor 2, a condenser 3 and a fan 4 located in the dehumidification space, wherein the compressor 2 is connected to the evaporator 1 and the condenser 3 through pipelines, respectively, and is also provided with a circulating heat exchange mechanism, the circulating heat exchange mechanism includes a front heat exchanger 5 arranged at the front end of the evaporator 1 and a rear heat exchanger 6 arranged at the rear end of the evaporator 1, the front heat exchanger 5 and the rear heat exchanger 6 are connected through pipelines, and a circulating pump 7 is provided on the pipeline, the front heat exchanger 5 and the rear heat exchanger 6 are filled with liquid coolant, and the coolant is circulated in the front heat exchanger 5 and the rear heat exchanger 6 through the circulating pump 7; in this example, the coolant is water;
[0037] like Figure 2 As shown, in this example, the front-end heat exchanger 5 and the rear-end heat exchanger 6 are both implemented by a surface cooler, and the surface cooler is provided with heat dissipation fins 8, a liquid inlet manifold 9, a liquid outlet manifold 10 and a branch coil pipeline 11, each branch coil pipeline 11 is in the same horizontal plane, and is connected between the liquid inlet manifold 9 and the liquid outlet manifold 10; further, a throttling structure is provided at the connection between the branch coil pipeline 11 and the manifold, and the throttling structure is a throttling tube 13 whose diameter is smaller than the inner diameter of the branch coil pipeline 11; or, the throttling structure is implemented by opening a throttling hole 12: the throttling hole 12 is opened at the end of the branch coil pipeline, and the branch coil pipeline with a throttling hole is provided. The end of 12 extends into the manifold, and the connection between the branch coil pipeline and the manifold is well welded; or, the throttling hole 12 is opened on the wall of the manifold, the diameter of the manifold throttling hole 12 is smaller than the inner diameter of the branch coil pipeline 11, and the branch coil pipeline 11 is welded on the outside of the throttling hole 12; the throttling structure causes a large pressure difference between the manifold and the branch coil pipeline 11, so that the refrigerant flows evenly and is distributed to each branch coil pipeline 11, so as to prevent the refrigerant from taking shortcuts in the cooler, causing uneven cooling and heating of various parts of the cooler, reducing efficiency, and causing trouble for control; in this example, the liquid in the cooler tube enters from the rear end and converges into the manifold from the front end, that is, the flow direction of the fluid in the cooler is opposite to the flow direction of the air;
[0038] This example is also provided with a control circuit connected to the fan and the circulation pump, the control circuit includes a PLC controller 14, a front temperature sensor 15, and a rear temperature sensor 16. The front temperature sensor 15 is used to collect the temperature data of the air inlet side of the evaporator 1, and the rear temperature sensor 16 is used to collect the ambient temperature data of the air outlet side of the evaporator 1. The PLC controller 14 is respectively connected to the front temperature sensor 15, the rear temperature sensor 16, the fan 4, and the circulation pump 7. The data of the front temperature sensor 15 and the rear temperature sensor 16 are collected in real time by the PLC controller 14, and the operating power of the fan 4 and the circulation pump 7 is adjusted in real time after analysis and processing. In this example, the temperature sensor is implemented by a thermocouple.
[0039] In this example, the air temperature at the rear end of the evaporator 1 is set to 5°C as the control temperature. In the initial state, the fan 4 can run at 50% power. According to the setting, after half a minute, the temperature of the rear temperature sensor 15 is detected. If the measured temperature is higher than 5°C, the power of the fan is reduced through the PLC controller 14, and the wind speed is reduced; otherwise, the power of the fan 7 is increased, and the wind speed is increased. Repeat the above operation to adjust the fan wind speed until the temperature value of the rear temperature sensor 15 approaches 5°C.
[0040] The following briefly describes the process of the PLC controller controlling the pipeline pump 7:
[0041] The pipeline pump 7 initially runs at 30% power. Three minutes later (the refrigerant in the rear heat exchanger 6 tube needs to be precooled in the initial stage):
[0042] A. Detect the temperature values of the front-end temperature sensor 15 and the rear-end temperature sensor 16, and obtain the difference between the two as X;
[0043] B. Increase the power of the pipeline pump 7 by 5% (35% power). One minute later, measure the temperature difference Y between the front temperature sensor 15 and the rear temperature sensor 16;
[0044] C. Reduce the power of the pipeline pump 7 by 10% (25% of the power), and after another minute, measure the temperature difference Z between the front temperature sensor 15 and the rear temperature sensor 16;
[0045] D. Compare the values of X, Y, and Z, and continue to run for one minute at the corresponding minimum power. Repeat steps A to D above.
[0046] If the powers selected twice are the same, the power difference will be adjusted to half, and steps A to D will be repeated until the optimal power of pipeline pump 7 is obtained (this power must correspond to the lowest temperature that the air can reach after passing through the front heat exchanger).
[0047] Compared with the prior art, the utility model has the remarkable advantages of reasonable structure, reliable operation, low energy consumption, high dehumidification efficiency and the like.
Claims
1. An energy-saving and efficient dehumidification device, comprising an evaporator, a compressor, a condenser and a fan located in a dehumidification space, wherein the compressor is connected to the evaporator and the condenser via pipelines, respectively. It is characterized in that A circulating heat exchange mechanism is also provided, which includes a front-end heat exchanger arranged at the front end of the evaporator and a rear-end heat exchanger arranged at the rear end of the evaporator. The front-end heat exchanger and the rear-end heat exchanger are connected through a pipeline, and a circulating pump is provided on the pipeline. The front-end heat exchanger and the rear-end heat exchanger are filled with liquid refrigerant, and the refrigerant is circulated in the front-end heat exchanger and the rear-end heat exchanger through the circulating pump.
2. An energy-saving and efficient dehumidification device according to claim 1, It is characterized in that The front-end heat exchanger and the rear-end heat exchanger are surface coolers, which are provided with heat dissipation fins and branch coil pipelines, liquid inlet manifolds, and liquid outlet manifolds. Each branch coil pipeline is in the same horizontal plane and is connected between the liquid inlet manifolds and the liquid outlet manifolds.
3. An energy-saving and efficient dehumidification device according to claim 2, It is characterized in that A throttling structure is provided at the connection between one end of the branch coil pipeline and the confluence pipe, and the throttling structure is a throttling pipe whose diameter is smaller than the inner diameter of the branch coil pipeline.
4. An energy-saving and efficient dehumidification device according to claim 2, It is characterized in that A throttling structure is provided at the connection between one end of the branch coil pipeline and the confluence pipe, wherein a throttling hole is provided in the throttling structure. The throttling hole is opened at the end of the branch coil pipeline. The end of the branch coil pipeline with the throttling hole is extended into the confluence pipe, and the connection between the branch coil pipeline and the confluence pipe is welded.
5. The energy-saving and efficient dehumidification device according to claim 2, It is characterized in that A throttling structure is provided at the connection between one end of the branch coil pipeline and the confluence pipe. The throttling structure adopts a throttling hole opened on the confluence pipe wall. The aperture of the throttling hole is smaller than the inner diameter of the branch coil pipeline. The branch coil pipeline is welded on the outside of the throttling hole of the confluence pipe.
6. An energy-saving and efficient dehumidification device according to claim 2, It is characterized in that The liquid in the cooler tube enters from the rear end, flows to the front end and then gathers into the manifold. The flow direction of the fluid in the cooler is opposite to that of the air, which is used to improve the heat exchange efficiency of the cooler.
7. The energy-saving and efficient dehumidification device according to claim 1, It is characterized in that A control circuit connected to the fan and the circulating pump is also provided, and the control circuit includes a PLC controller, a front-end temperature sensor, and a rear-end temperature sensor. The front-end temperature sensor is used to collect the ambient temperature data of the front end of the evaporator, and the rear-end temperature sensor is used to collect the temperature data of the rear end of the evaporator. The PLC controller is respectively connected to the front-end temperature sensor, the rear-end temperature sensor, the circulating pump, and the fan, and adjusts the operating power of the fan and the circulating pump by analyzing the collected air temperatures at the front and rear sides of the evaporator.