CN101846368B - Solution dehumidifying fresh air handling unit combining heat pump drive and evaporative cooling - Google Patents

Abstract

The invention relates to a solution dehumidification fresh air unit combined with heat pump drive and evaporative cooling, which is characterized in that it includes a solution circulation system, a heat pump system and an evaporative cooling water system; The interstage solution circulation loop is formed; the heat pump system includes a circulation loop composed of a compressor, a first condenser, a throttle valve and an evaporator connected in sequence to exchange heat with the solution, and also includes a compressor, a solenoid valve, and a second condenser. , throttling valve and evaporator are connected in turn to form a circulation loop for heat exchange with water; the heat exchange ends of the first condenser and evaporator are respectively connected to the regeneration module and the dehumidification module through the solution circulation pump to form a two-stage internal solution circulation Loop: The evaporative cooling water system includes an evaporative cooling module, a water circulation pump and a water supply valve, and the evaporative cooling module is connected to the second condenser through the water circulation pump to form a circulation circuit for heat exchange with the refrigerant. The invention can be widely used in occasions where no indoor exhaust air is available.

Description

A solution dehumidification fresh air unit combined with heat pump drive and evaporative cooling

technical field

The invention relates to a fresh air unit, in particular to a solution dehumidification fresh air unit combined with heat pump driving and evaporative cooling.

Background technique

At present, most of the existing air conditioners adopt the condensation dehumidification treatment method, and use the refrigerator to prepare low-temperature frozen water to reduce the air temperature below the dew point, thereby realizing the dehumidification treatment process for the fresh air. Since the required cold source temperature is very low (lower than the dew point temperature of the air), the evaporation temperature of the refrigerator is reduced, which seriously affects the coefficient of performance of the refrigerator. Moreover, the condensed water produced by condensation dehumidification is easy to breed mold and seriously affect the indoor air quality. The solution dehumidification method uses a salt solution with hygroscopic properties as the working medium, which is in direct contact with the fresh air for heat and mass transfer, and realizes the dehumidification process of the fresh air. The solution dehumidification method can use a low-temperature heat source as the energy source for the concentration and regeneration of the solution, such as solar energy, hot water or waste heat from the heating network, etc. Due to its advantages in saving energy and improving indoor air quality, solution dehumidification has been widely concerned and applied in more and more buildings.

Patent ZL03134688.X discloses a solution full heat recovery type fresh air air conditioner, which takes away excess heat from the condenser by setting an auxiliary condenser (air cooling), but since the auxiliary condenser heats the air (humidity does not occur Change) makes the air's ability to take away heat limited, and the condensation temperature is still relatively high. ZL200610012259.3 discloses a heat-driven solution fresh air unit that utilizes return air evaporative cooling and total heat recovery type. It installs a water supply device in the solution regeneration module to increase the moisture content in the solution in contact with the air and increase the outlet humidity of the air. To take away the excess exhaust heat of the condenser, so that the condensation temperature is maintained at a low temperature level. However, the function of the regeneration module itself is to increase the concentration of the solution and realize the concentrated regeneration of the solution, while replenishing water directly leads to a decrease in the concentration of the solution. There is a significant contradiction between the two. But in above-mentioned two patents, indoor exhaust air can be utilized, that is, the energy of indoor exhaust air can be reclaimed in a certain way to reduce the energy consumption of fresh air treatment. But in many cases, no indoor exhaust can be used. Patent ZL200610012268.2 discloses a heat-driven solution fresh air treatment unit that uses cooling water as a cooling source. It installs an evaporative cooling device (using cooling water as a cooling source) Take away the excess heat of the condenser, but because the heat of the condenser is only taken away by the solution regeneration system, the condensation temperature is very high, which significantly reduces the performance of the solution dehumidification unit. In addition, in the above three patents, the heat rejection of the condenser is greater than the heat required for the concentration and regeneration of the solution in the system. If the excess heat of this part of the condenser is not eliminated, the condensation temperature will continue to rise, which will significantly affect the heat pump. system and the performance of the entire solution dehumidification unit.

Contents of the invention

In view of the above problems, the purpose of the present invention is to provide a combination of heat pump drive and evaporative cooling for the heat pump drive that uses regenerative exhaust air for evaporative cooling to produce cooling water to bear part of the heat of the condenser when there is no indoor exhaust air available. solution dehumidification fresh air unit.

To achieve the above object, the present invention adopts the following technical solutions: a solution dehumidification fresh air unit combined with heat pump drive and evaporative cooling, characterized in that it includes a solution circulation system, a heat pump system and an evaporative cooling water system; the solution The circulation system includes a dehumidification module, a regeneration module and a solution circulation pump. The dehumidification module and the regeneration module are connected through the solution circulation pump to form an interstage solution circulation loop, and all the A plate heat exchanger is arranged on the interstage solution circulation circuit; the heat pump system includes a compressor, a first condenser, a second condenser, an evaporator, a throttle valve and a solenoid valve, wherein the compressor The compressor, the first condenser, the throttle valve and the evaporator are sequentially connected to form a circulation circuit for heat exchange with the solution, and the compressor, electromagnetic valve, second condenser, throttle valve and evaporator are connected in sequence to form a heat exchange circuit with water circulation loop, and both of the circulation loops are filled with refrigerant; the heat exchange ends of the first condenser and the evaporator are respectively connected with the regeneration module and the dehumidification module in the solution circulation system through a solution circulation pump The modules are connected to form two internal solution circulation loops, and the dehumidification solution is filled in the two internal solution circulation loops; the evaporative cooling water system includes an evaporative cooling module, a water circulation pump and a water replenishment valve. The evaporative cooling module is connected with the second condenser in the heat pump system through the water circulation pump to form a circulation loop for exchanging heat with the refrigerant.

The dehumidification module, regeneration module and evaporative cooling module are all gas-liquid direct contact spray modules.

The dehumidification solution flow rate in the inter-stage solution circulation loop is only one-tenth of the dehumidification solution flow rate in the intra-stage solution circulation loop.

It includes more than two fresh air units composed of the solution circulation system, the heat pump system and the evaporative cooling water system, and the two or more fresh air units adopt the mode of regenerative fresh air parallel connection.

A solution dehumidification fresh air unit combined with heat pump drive and evaporative cooling, characterized in that it includes more than two solution circulation systems in series, more than two heat pump systems in series and an evaporative cooling water system; the solution circulation system includes a A dehumidification module, a regeneration module and a solution circulation pump, the dehumidification module and the regeneration module are connected through the solution circulation pump to form an interstage solution circulation loop, and the interstage solution between the dehumidification module and the regeneration module A plate heat exchanger is arranged on the circulation circuit; the heat pump system includes a compressor, a first condenser, a second condenser, an evaporator, a throttle valve and a solenoid valve, wherein the compressor, the first The condenser, the throttle valve and the evaporator are connected in sequence to form a cycle of heat exchange with the solution, and the compressor, solenoid valve, second condenser, throttle valve and evaporator are connected in sequence to form a cycle of heat exchange with water, and Both the circulation loops are filled with refrigerant; the heat exchange ends of the first condenser and the evaporator are respectively connected to the regeneration module and the dehumidification module in the solution circulation system through a solution circulation pump to form two In-stage solution circulation loop, and dehumidification solution is filled in the two in-stage solution circulation loops; the evaporative cooling water system includes an evaporative cooling module, a water circulation pump and a water supply valve, and the evaporative cooling module passes through the The water circulation pump is connected in series with all the second condensers in the heat pump system to form a circulation loop for exchanging heat with the refrigerant.

The dehumidification module, regeneration module and evaporative cooling module are all gas-liquid direct contact spray modules.

The dehumidification solution flow rate in the inter-stage solution circulation loop is only one-tenth of the dehumidification solution flow rate in the intra-stage solution circulation loop.

Because the present invention adopts the above technical scheme, it has the following advantages: 1. The present invention uses the solution with hygroscopicity as the working medium, and combines the solution circulation system, the heat pump system and the evaporative cooling water system to make the cooling of the evaporator in the heat pump system Both the cooling capacity of the evaporator and the heat of the condenser have been effectively utilized. The cooling capacity of the evaporator is used to reduce the temperature of the solution to improve its dehumidification capacity. Part of the heat of the condenser is used as a heat source for the concentration and regeneration of the solution, and the other part is discharged through evaporative cooling, reducing the Condensing temperature, improving heat pump efficiency. 2. The regeneration module of the present invention takes away the excess heat of the condenser through the evaporative cooling method of the air, on the one hand, it increases the humidity of the outlet air and improves the ability to carry heat, so that the condensation temperature can be kept at a low level; On the other hand, there is no water replenishment in the regeneration module, which fundamentally avoids the contradiction between the regeneration goal of increasing the concentration of the solution and replenishing water in the solution to reduce the solution, and can significantly improve energy utilization efficiency. 3. The present invention uses a salt solution as a dehumidification solution. The salt solution has the functions of sterilizing and purifying air, and can improve indoor air quality. The invention can be widely used in occasions where no indoor exhaust air is available.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 of the present invention

Fig. 2 is the structural representation of embodiment 2 of the present invention

Fig. 3 is the structural representation of embodiment 3 of the present invention

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Example 1:

As shown in FIG. 1 , the fresh air unit of this embodiment includes a solution circulation system I, a heat pump system II and an evaporative cooling water system III.

The solution circulation system I includes a dehumidification module A, a regeneration module B and a solution circulation pump 1. The dehumidification module A and the regeneration module B are connected through the solution circulation pump 1 to form an interstage solution circulation loop, and the dehumidification module A and the regeneration module B A plate heat exchanger 2 is arranged on the interstage solution circulation loop.

The heat pump system II includes a compressor 3, a condenser 4 that exchanges heat with the solution, a condenser 5 that exchanges heat with water, an evaporator 6, a throttle valve 7 and a solenoid valve 8, in which the compressor 3, the condenser 4, the throttle Valve 7 and evaporator 6 are sequentially connected to form a circulation loop for heat exchange with the solution, compressor 3, solenoid valve 8, condenser 5, throttle valve 7 and evaporator 6 are sequentially connected to form a circulation loop for heat exchange with water, and the two Each circulation loop is filled with refrigerant, and the distribution of heat exhausted by the condenser 5 can be controlled by starting and stopping the solenoid valve 8. The heat exchange ends of the condenser 4 and the evaporator 6 are respectively connected to the regeneration module B and the dehumidification module A in the solution circulation system I through a solution circulation pump 1 to form two-stage internal solution circulation loops, and the two-stage internal solution circulation The circuit is filled with dehumidification solution.

The evaporative cooling water system III includes an evaporative cooling module C, a water circulation pump 9 and a water supply valve 10. The evaporative cooling module C is connected to the condenser 5 in the heat pump system II through the water circulation pump 9 to form a circulation circuit for heat exchange with the refrigerant.

In the above embodiment, the dehumidification module A, regeneration module B and evaporative cooling module C are all gas-liquid direct contact spray modules, wherein the dehumidification module A is a solution in direct contact with the air, which is used to cool and dehumidify the fresh air; the regeneration module B is a solution In direct contact with air, it is used for concentrated regeneration of the solution; the evaporative cooling module C is in direct contact with water and air, and is used to remove excess heat from the condenser.

In the above embodiments, the dehumidification solution flow rate in the inter-stage solution circulation loop is only about one-tenth of the dehumidification solution flow rate in the intra-stage solution circulation loop (ie in the dehumidification module A or regeneration module B).

Example 2:

As shown in Figure 2, the difference between this embodiment and Embodiment 1 is that the fresh air unit of this embodiment adopts the mode of regenerative fresh air parallel connection, which includes two parallel fresh air units, and the structure of the two fresh air units is the same as that of Embodiment 1. Similarly, one fresh air for regeneration passes through the regeneration module B1 and the evaporative cooling module C1 in sequence, and the other fresh air for regeneration passes through the regeneration module B2 and the evaporative cooling module C2 in sequence.

In the above embodiment, the number of fresh air units connected in parallel can also be more than two, and the specific number can be determined according to the usage on site.

Example 3:

As shown in Figure 3, the difference between this embodiment and Embodiment 1 is that the fresh air unit of this embodiment adopts a series mode of regenerative fresh air, which includes two series-connected solution circulation systems I, two series-connected heat pump systems II and a The evaporative cooling water system III, and the condenser 5 in the two heat pump systems II and the evaporative cooling module C in the evaporative cooling water system III are connected in series to form a circulation circuit for heat exchange with the refrigerant. The outdoor fresh air first passes through the dehumidification module A1, A2, and then pass through regeneration modules B2 and B1 in turn.

In the above embodiment, the number of the solution circulation system I and the heat pump system II connected in series can also be more than two, and the specific number can be determined according to the usage on site.

Analyze the flow process of air and solution and its state change situation according to embodiment 3 below, as shown in Figure 3, the straight line in the figure represents the dehumidifying solution circulating in the stage, and the dotted line represents the dehumidifying solution circulating between the stages (i.e. flowing through the plate heat exchanger 2), the dotted line represents the circulating refrigerant, and the double straight line represents the circulating cooling water.

The upper channel of the present invention is a regeneration air channel, which is mainly used for the concentrated regeneration of the dehumidification solution, and takes away the excess heat exhausted by the condensers 4 and 5 through the evaporative cooling of the air; the lower layer is a fresh air treatment channel, which is mainly used for cooling the fresh air Dehumidification. The outdoor fresh air on the lower floor passes through the dehumidification modules A1 and A2 in turn to contact the low-temperature dehumidification solution in each stage for heat and mass transfer, and the fresh air is sent into the room after being cooled and dehumidified. The upper layer uses outdoor fresh air as the regeneration airflow, and the outdoor fresh air passes through the regeneration modules B2 and B1 in turn, and contacts with the high-temperature solution in the regeneration modules B2 and B1 for heat and mass transfer to regenerate the solution; then enters the evaporative cooling module C to produce cooling water. The replenishing water valve 10 is used to replenish water to the evaporative cooling module C, and its supplementary water amount is only equal to the humidity increase of the fresh air entering and leaving the evaporative cooling module C. The evaporator 6 of the heat pump system II is used to cool the dehumidification solution entering the dehumidification modules A1 and A2 respectively, the heat exhausted by the condenser 4 is used to heat the dehumidification solution entering the regeneration modules B1 and B2, and the cooling water generated by the evaporative cooling module C is first used It cools the condenser 5 on the right, then cools the condenser 5 on the left, and then returns to the evaporative cooling module C to continue the cycle. The evaporation temperature and condensation temperature of the heat pump system II on the left are both higher than the corresponding temperatures of the heat pump system II on the right, that is, cold sources of different temperatures are used to cool the dehumidification solutions entering the dehumidification modules A1 and A2. The higher-temperature concentrated solution flowing out from the regeneration module B1 or B2 and the lower-temperature dilute solution flowing out from the dehumidification module A1 or A2 pass through the plate heat exchanger 2 on the interstage solution circulation loop to recover heat.

The present invention is only described with the above-mentioned embodiments, and the structure, setting position, and connection of each component can be changed. On the basis of the technical solution of the present invention, all improvements and improvements made to individual components according to the principle of the present invention Equivalent transformations shall not be excluded from the protection scope of the present invention.

Claims (8)

1. a heat pump drives the new blower fan group of solution dehumidification that combines with evaporative cooling, it is characterized in that: it comprises that a solution recycle system, a heat pump and a vaporized coolant stream unite;

Said solution recycle system comprises a dehumidification module, a regeneration module and a solution circulation pump; Said dehumidification module and regeneration module connect to form the inter-stage solution circulating through said solution circulation pump, and on the said inter-stage solution circulating between said dehumidification module and the regeneration module, a plate type heat exchanger are set;

Said heat pump comprises a compressor, first condenser, second condenser, an evaporimeter, a choke valve and a magnetic valve; Wherein said compressor, first condenser, choke valve and evaporimeter connect to form the closed circuit with the solution heat exchange successively; Said compressor, magnetic valve, second condenser, choke valve and evaporimeter connect to form the closed circuit with the water heat exchange successively, and equal can refrigeration working medium in the two said closed circuits; The heat-exchange end of said first condenser and evaporimeter separately through a solution circulation pump respectively with said solution recycle system in regeneration module and dehumidification module connect to form solution circulating in two levels, and equal can dehumidification solution in the solution circulating in two said levels;

Said vaporized coolant stream turnkey is drawn together an evaporative cooling module, a water-circulating pump and a water compensating valve, and said evaporative cooling module connects to form the closed circuit with the refrigeration working medium heat exchange through second condenser in said water-circulating pump and the said heat pump.

2. the new blower fan group of solution dehumidification that a kind of heat pump as claimed in claim 1 drives and evaporative cooling combines, it is characterized in that: said dehumidification module, regeneration module and evaporative cooling module are the gas-liquid direct contacted spraying module.

3. the new blower fan group of solution dehumidification that a kind of heat pump as claimed in claim 1 drives and evaporative cooling combines is characterized in that: the dehumidification solution flow in the said inter-stage solution circulating is merely 1/10th of the said grade of dehumidification solution flow in the interior solution circulating.

4. the new blower fan group of solution dehumidification that a kind of heat pump as claimed in claim 2 drives and evaporative cooling combines is characterized in that: the dehumidification solution flow in the said inter-stage solution circulating is merely 1/10th of the said grade of dehumidification solution flow in the interior solution circulating.

5. drive the new blower fan group of solution dehumidification with the evaporative cooling combination like claim 1 or 2 or 3 or 4 described a kind of heat pumps; It is characterized in that: it comprises the new blower fan group of being made up of said solution recycle system, said heat pump and said vaporized coolant stream system more than two, and two the above new blower fan groups adopt the parallelly connected pattern of the new wind of regeneration.

6. a heat pump drives the new blower fan group of solution dehumidification that combines with evaporative cooling, it is characterized in that: it comprises the solution recycle system of series connection more than two, the heat pump of series connection more than two and a vaporized coolant stream are united;

Said solution recycle system comprises a dehumidification module, a regeneration module and a solution circulation pump; Said dehumidification module and regeneration module connect to form the inter-stage solution circulating through said solution circulation pump, and on the said inter-stage solution circulating between said dehumidification module and the regeneration module, a plate type heat exchanger are set;

Said heat pump comprises a compressor, first condenser, second condenser, an evaporimeter, a choke valve and a magnetic valve; Wherein said compressor, first condenser, choke valve and evaporimeter connect to form the circulation with the solution heat exchange successively; Said compressor, magnetic valve, second condenser, choke valve and evaporimeter connect to form the closed circuit with the water heat exchange successively, and equal can refrigeration working medium in the two said closed circuits; The heat-exchange end of said first condenser and evaporimeter separately through a solution circulation pump respectively with said solution recycle system in regeneration module and dehumidification module connect to form solution circulating in two levels, and equal can dehumidification solution in the solution circulating in two said levels;

Said vaporized coolant stream turnkey is drawn together an evaporative cooling module, a water-circulating pump and a water compensating valve, and said evaporative cooling module is connected in series through second condenser in said water-circulating pump and all the said heat pumps and forms the closed circuit with the refrigeration working medium heat exchange.

7. the new blower fan group of solution dehumidification that a kind of heat pump as claimed in claim 6 drives and evaporative cooling combines, it is characterized in that: said dehumidification module, regeneration module and evaporative cooling module are the gas-liquid direct contacted spraying module.

8. like the new blower fan group of solution dehumidification of claim 6 or 7 described a kind of heat pumps drivings and evaporative cooling combination, it is characterized in that: the dehumidification solution flow in the said inter-stage solution circulating is merely 1/10th of the said grade of dehumidification solution flow in the interior solution circulating.

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