Auxiliary defrosting, deicing and synergistic device of CO2 heat pump heat source system

Abstract

The utility model discloses an auxiliary defrosting, deicing and synergistic device for a CO2 heat pump heat source system, which is characterized in that a water-water heat exchanger, a proportional integral valve and a T1 temperature sensor are arranged on a circulating water return pipe of the system, and an anti-freezing solution discharge pipe is arranged in an outdoor heat exchanger and is connected with the water-water heat exchanger. According to the device, in the heating process of the CO2 heat pump at the low environment temperature, the heat of the part with the return water temperature higher than 25 DEG C is recycled, the fin temperature of part of the area of the outdoor heat exchanger is increased, the frosting period of the outdoor heat exchanger is prolonged, the defrosting time is shortened, and the continuous heating operation time of the device is effectively prolonged; meanwhile, the return water temperature of the system is lower than 25 DEG C, and the heating operation efficiency of equipment is effectively improved, so that the energy utilization rate is improved; and unstable and uncomfortable states caused by temperature fluctuation of the utilization side when the host enters the defrosting mode are reduced. According to the design requirement, the structure is simple, combination is convenient, batch production is facilitated, and the device is suitable for CO2 heat pump systems of various specifications and models.

Description

TECHNICAL FIELD

[0001] The utility model belongs to heat energy conversion and utilization technical field, specifically related to a CO2 heat pump heat source system auxiliary defrosting, deicing and synergistic device. TECHNICAL BACKGROUND

[0002] CO2 low ambient temperature heat pump, as a kind of heat pump equipment using natural working substance, has its unique advantages: working substance environmental protection, no pollution to atmosphere, no destruction to ozone layer, not dependent on fossil product synthesis, cheap etc.;Equipment runs under cross-critical state, can run at-35 ℃ ambient temperature, can provide more than 85 ℃ hot water to utilization end, including domestic hot water, heating, industrial production etc.;Compared with using other working substance equipment under low ambient temperature working condition, it has higher energy efficiency ratio.

[0003] But when it serves heating or industrial production, the return water temperature of circulating system is generally higher than 38 ℃, higher than the critical temperature of CO2 working substance, thus leading to low equipment operation efficiency.

[0004] It is in cold environmental conditions, like using other working substance equipment, in running process, must experience frost-defrosting cycle. Especially under-15 ℃ environmental conditions, defrosting is not timely or not thorough, and the bottom of outdoor heat exchanger is prone to freeze. SUMMARY

[0005] The utility model discloses to aim at the deficiency existing in prior art, provide a CO2 heat pump heat source system auxiliary defrosting, deicing and synergistic device.

[0006] The utility model discloses a CO2 heat pump heat source system auxiliary defrosting, deicing and synergistic device, including outdoor side heat exchanger, antifreeze discharge pipe, refrigerant working substance discharge pipe, temperature sensor, water-water heat exchanger, proportional integral valve and antifreeze circulating pump, set up water-water heat exchanger, proportional integral valve and T1 temperature sensor on system circulating return water pipe, the proportional integral valve is set in the return water pipe and water supply pipe of water-water heat exchanger middle, T1 temperature sensor is set in the secondary side of water-water heat exchanger, set up T2 temperature sensor on the antifreeze circulating return pipe of water-water heat exchanger outlet, set up antifreeze circulating pump on the antifreeze circulating supply pipe of water-water heat exchanger, set up antifreeze discharge pipe in the outdoor side heat exchanger, antifreeze discharge pipe entrance and export are connected with the antifreeze circulating supply pipe and return pipe of water-water heat exchanger respectively.

[0007] Preferably, the anti-freezing liquid discharge pipe further comprises an anti-freezing liquid circulation water supply branch pipe, an anti-freezing liquid circulation return water branch pipe, an anti-freezing liquid circulation distribution pipe and an anti-freezing liquid circulation collection pipe, the anti-freezing liquid circulation supply pipe of the water-water heat exchanger is connected to the anti-freezing liquid discharge pipe inlet through the anti-freezing liquid circulation distribution pipe and the anti-freezing liquid circulation water supply branch pipe in sequence, and the anti-freezing liquid discharge pipe outlet is connected to the anti-freezing liquid circulation return pipe of the water-water heat exchanger through the anti-freezing liquid circulation return water branch pipe and the anti-freezing liquid circulation collection pipe in sequence.

[0008] Preferably, the anti-freezing liquid circulation water supply branch pipe is parallelly connected to the anti-freezing liquid circulation distribution pipe in multiple ways, and the anti-freezing liquid circulation return water branch pipe is parallelly connected to the anti-freezing liquid circulation collection pipe in multiple ways, and the anti-freezing liquid discharge pipe inlet of each way is arranged above the anti-freezing liquid discharge pipe outlet.

[0009] Preferably, the anti-freezing liquid discharge pipe is arranged at the middle position of the refrigerant working medium discharge pipe.

[0010] Preferably, the anti-freezing liquid discharge pipe is made of the same material and has the same diameter as the refrigerant working medium discharge pipe.

[0011] The utility model discloses technical effects achieved are as follows:

[0012] The utility model discloses a CO2 heat pump heat source system auxiliary defrosting, deicing and efficiency increasing device, which can make the CO2 heat pump recover the heat of the part with a water return temperature higher than 25 DEG C during the heating process at low ambient temperature, transport the heat to the outdoor heat exchanger, improve the fin temperature of the part of the outdoor heat exchanger, prolong the defrosting time, effectively prolong the continuous heating operation time of the equipment, ensure the water return temperature of the system to be lower than 25 DEG C, effectively improve the heating operation efficiency of the equipment, thereby improve the energy utilization rate, and reduce the instability and uncomfortable state caused by the temperature fluctuation of the utilization side due to the defrosting mode of the host. ACCURATE DRAWINGS

[0013] Figure 1 The utility model discloses structure schematic and technological process diagram;

[0014] Figure 2 The utility model discloses the theoretical pressure enthalpy diagram of original system;

[0015] Figure 3 The utility model discloses the theoretical pressure enthalpy diagram after using the technology.

[0016] In the figure: 1-outside heat exchanger, 2-antifreeze discharge pipe inlet, 3-antifreeze circulating water supply branch pipe, 4-antifreeze discharge pipe outlet, 5-antifreeze circulating return water branch pipe, 6-antifreeze circulating distribution pipe, 7-antifreeze circulating collection pipe, 8-refrigerant working medium discharge pipe, 9-T1 temperature sensor, 10-T2 temperature sensor, 11-water-water heat exchanger, 12-proportional integral valve, 13-antifreeze circulating pump. DETAILED DESCRIPTION

[0017] The present application can be more fully understood by reference to the following detailed description when considered in connection with the accompanying drawings, in which:

[0018] As shown in the figure, the present application is a CO2 heat pump heat source system auxiliary defrosting, deicing and efficiency increasing device, which is composed of the following key components: outside heat exchanger 1, antifreeze discharge pipe, refrigerant working medium discharge pipe 8, antifreeze circulating pump 13, water-water heat exchanger 11, temperature sensor, proportional integral valve 12, etc. The water-water heat exchanger 11, proportional integral valve 12 and T1 temperature sensor 9 are arranged on the system circulating return water pipe. The proportional integral valve 12 is arranged in the middle of the return water pipe and water supply pipe of the water-water heat exchanger 11. The T1 temperature sensor 9 is arranged on the secondary side of the water-water heat exchanger 11. The T2 temperature sensor 10 is arranged on the antifreeze circulating return pipe of the water outlet end of the water-water heat exchanger 11. The antifreeze circulating pump 13 is arranged on the antifreeze circulating supply pipe of the water-water heat exchanger 11. The antifreeze discharge pipe is arranged in the outside heat exchanger 1. The antifreeze discharge pipe inlet and outlet are connected with the antifreeze circulating supply pipe and return pipe of the water-water heat exchanger 11, respectively. Figure 1 Further, the antifreeze discharge pipe further includes antifreeze circulating water supply branch pipe 3, antifreeze circulating return water branch pipe 5, antifreeze circulating distribution pipe 6 and antifreeze circulating collection pipe 7. The antifreeze circulating supply pipe of the water-water heat exchanger 11 is connected with the antifreeze discharge pipe inlet 2 in sequence through the antifreeze circulating distribution pipe 6 and antifreeze circulating water supply branch pipe 3. The antifreeze discharge pipe outlet 4 is connected with the antifreeze circulating return pipe of the water-water heat exchanger 11 in sequence through the antifreeze circulating return water branch pipe 5 and antifreeze circulating collection pipe 7.

[0019] Further, the antifreeze circulating water supply branch pipe 3 is divided into multiple parallel paths on the antifreeze circulating distribution pipe 6. The antifreeze circulating return water branch pipe 5 is divided into multiple parallel paths on the antifreeze circulating collection pipe 7. The antifreeze discharge pipe inlet 2 of each path is arranged above the antifreeze discharge pipe outlet 3.

[0020] Further, the antifreeze circulating water supply branch pipe 3 is divided into multiple parallel paths on the antifreeze circulating distribution pipe 6. The antifreeze circulating return water branch pipe 5 is divided into multiple parallel paths on the antifreeze circulating collection pipe 7. The antifreeze discharge pipe inlet 2 of each path is arranged above the antifreeze discharge pipe outlet 3.

[0021] The working process of the utility model is: when T1 temperature sensor 9 detects that the temperature is less than or equal to 25.0 ± 1.0 DEG C, then electric proportional integral valve 12 is fully opened, system circulating water does not enter water-water heat exchanger 11 primary side, and does not exchange heat with water-water heat exchanger 11 secondary side antifreeze; when T1 temperature sensor 9 detects that the temperature is higher than 25 DEG C, then electric proportional integral valve 12 automatically adjusts the opening, always stabilizes T1 temperature ≈ 25.0 ± 1.0 DEG C, at this time, system circulating water enters water-water heat exchanger 11 primary side, exchanges heat with water-water heat exchanger 11 secondary side antifreeze, and antifreeze circulating pump 13 starts, and the antifreeze after being heated is sent into outdoor heat exchanger 1, the heat carried by the antifreeze is absorbed by the CO2 working medium circulating in the outdoor heat exchanger 1, and the antifreeze after being cooled is returned to water-water heat exchanger 11 through a circulating pipe, and a heat cycle is formed; when T2 temperature sensor 10 detects that the temperature is less than or equal to 2.0 ± 0.5 DEG C, antifreeze circulating pump 13 will start to reduce the frequency until stopping operation, and it is ensured that the water in water-water heat exchanger 11 primary side is not frozen.

[0022] The utility model features: the CO2 heat pump heat source system auxiliary defrosting, deicing and efficiency increasing device is realized by the module that each part shown in the figure jointly constitutes. Figure 1

[0023] The utility model features: compared with the traditional air side heat exchanger, a circulating pipeline with internal working medium as antifreeze is added.

[0024] The utility model features: the material and the pipe diameter of the antifreeze discharge pipe in the outdoor heat exchanger 1 are same with the refrigerant working medium discharge pipe.

[0025] The utility model features: the antifreeze is divided into multiple parallel paths in the outdoor heat exchanger 1, and each path is in the mode of upper inlet and lower outlet, avoiding the problem of poor flow caused by the large viscosity coefficient of the antifreeze.

[0026] The utility model features: the temperature of system circulating water after adding the device can be controlled at 25.0 ± 1.0 DEG C.

[0027] ​The utility model discloses a feature still lies in: after increasing device, antifreeze and system backwater are obtained temperature rise after heat exchange in water-water heat exchanger 11, are sent into outdoor side heat exchanger 1 through antifreeze circulating pump 13 and participate in heat exchange with the gas-liquid two-phase CO2 after expansion, effectively delay the frost cycle of air side heat exchanger, reduce the frequency of equipment defrosting, ice melting, shorten defrosting time simultaneously.

[0028] The utility model discloses a feature still lies in: antifreeze can adopt multiple forms, and according to the lowest environmental temperature of equipment installation place, the concentration thereof is adjusted. Embodiment

[0029] The embodiment adopts laboratory simulation. The simulated area is "Urumqi City, Xinjiang", and the outdoor air conditioning heating calculation temperature thereof in winter is -23.7 DEG C, and the relative humidity in the coldest month is 78%, and the dew point temperature obtained by searching the corresponding enthalpy humidity chart is -26.4 DEG C. The equipment adopts a CO2 transcritical air energy heat pump unit with a heating capacity of 100 kW, and the equipment simulates a heating system, and the system water temperature is 65 DEG C, the backwater temperature is 40 DEG C, and the system water flow is 2.05 m³ / h. Two groups of outdoor side heat exchangers are configured: one group is matched with the original equipment and adopts 3-row pipes; and one group is the outdoor side heat exchanger special for the utility model and adopts 3+1 row pipes, wherein 1 is an antifreeze passage, and the passage is located at the second row position in sequence; and a 35 kW plate type water-water heat exchanger is configured at the same time.

[0030] The antifreeze adopts a glycol solution, and the mass concentration of the solution is 55%, the freezing point of the solution is -41.1 DEG C, and the flow rate is less than or equal to 1.5 m³ / h. The power of the antifreeze circulating pump is 0.75 kW.

[0031] According to experimental measurement, after the utility model technology is adopted, the unit energy efficiency ratio is improved by 35%; one defrosting cycle is improved from 65 minutes to 90 minutes; and the defrosting time is shortened from 20 minutes to 10 minutes. Figures 2-3 The figure shows the change of the system theoretical pressure-enthalpy diagram before and after the utility model device is adopted.

[0032] The above only is the preferred implementation mode of the utility model, and it should be pointed out that, for ordinary skilled person in the art, on the premise of not departing from the principle of the utility model, can make a number of improvements and refinements, and these improvements and refinements also should be regarded as the protection scope of the utility model. The structure, device and operation method not specifically described and explained in the utility model are implemented according to the conventional means in the field without special description and limitation.

Claims

1. An auxiliary defrosting, de-icing, and efficiency-enhancing device for a CO2 heat pump heat source system, comprising an outdoor heat exchanger, antifreeze manifold, refrigerant working fluid manifold, a temperature sensor, a water-to-water heat exchanger, a proportional-integral valve, and an antifreeze circulation pump, characterized in that, A water-to-water heat exchanger, a proportional-integral valve, and a T1 temperature sensor are installed on the system's circulating return water pipe. The proportional-integral valve is located between the return water pipe and the supply water pipe of the water-to-water heat exchanger. The T1 temperature sensor is located on the secondary side of the water-to-water heat exchanger. A T2 temperature sensor is installed on the antifreeze circulating return pipe at the outlet end of the water-to-water heat exchanger. An antifreeze circulating pump is installed on the antifreeze circulating supply pipe of the water-to-water heat exchanger. An antifreeze drain pipe is installed inside the outdoor heat exchanger. The inlet and outlet of the antifreeze drain pipe are connected to the antifreeze circulating supply pipe and return pipe of the water-to-water heat exchanger, respectively.

2. The auxiliary defrosting, de-icing, and efficiency-enhancing device for a CO2 heat pump heat source system according to claim 1, characterized in that, The antifreeze drain pipe also includes an antifreeze circulation supply branch pipe, an antifreeze circulation return branch pipe, an antifreeze circulation distribution pipe, and an antifreeze circulation main pipe. The antifreeze circulation supply pipe of the water-to-water heat exchanger is connected to the inlet of the antifreeze drain pipe in sequence through the antifreeze circulation distribution pipe and the antifreeze circulation supply branch pipe. The outlet of the antifreeze drain pipe is connected to the antifreeze circulation return pipe of the water-to-water heat exchanger in sequence through the antifreeze circulation return branch pipe and the antifreeze circulation main pipe.

3. The auxiliary defrosting, de-icing, and efficiency-enhancing device for a CO2 heat pump heat source system according to claim 2, characterized in that, The antifreeze circulation water supply branch pipe is connected in parallel to multiple branches on the antifreeze circulation distribution pipe, and the antifreeze circulation return water branch pipe is connected in parallel to multiple branches on the antifreeze circulation main pipe. The inlet of each branch antifreeze drain pipe is located above the outlet of the antifreeze drain pipe.

4. The auxiliary defrosting, de-icing, and efficiency-enhancing device for a CO2 heat pump heat source system according to any one of claims 1-3, characterized in that, The antifreeze manifold is located in the middle of the refrigerant manifold.

5. The auxiliary defrosting, de-icing, and efficiency-enhancing device for a CO2 heat pump heat source system according to any one of claims 1-3, characterized in that, The antifreeze drain pipe has the same material and diameter as the refrigerant working fluid drain pipe.

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