CN110763004A - Dehumidification drying heat pump unit with fins and heat conduction flat plates in orthogonal arrangement - Google Patents
Dehumidification drying heat pump unit with fins and heat conduction flat plates in orthogonal arrangement Download PDFInfo
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- CN110763004A CN110763004A CN201911178055.0A CN201911178055A CN110763004A CN 110763004 A CN110763004 A CN 110763004A CN 201911178055 A CN201911178055 A CN 201911178055A CN 110763004 A CN110763004 A CN 110763004A
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- 238000001035 drying Methods 0.000 title claims abstract description 94
- 238000007791 dehumidification Methods 0.000 title claims abstract description 71
- 239000012530 fluid Substances 0.000 claims abstract description 126
- 239000003507 refrigerant Substances 0.000 claims abstract description 17
- 239000003570 air Substances 0.000 claims description 239
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 6
- 239000012080 ambient air Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 2
- 241000208125 Nicotiana Species 0.000 description 22
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 22
- 238000001816 cooling Methods 0.000 description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 5
- 238000003303 reheating Methods 0.000 description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000003287 bathing Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a dehumidification and drying heat pump unit with fins and a heat conduction flat plate orthogonally arranged, which comprises a first compressor, a first condenser, a first throttling device and a first evaporator, wherein the first compressor, the first condenser, the first throttling device and the first evaporator are sequentially connected to form a circulating system for circulating a refrigerant; a cross flow heat exchanger is arranged between the air inlet path and the air outlet path of the first evaporator, and wet air as air outlet of the drying device flows through a hot fluid channel of the cross flow heat exchanger, the first evaporator and a cold fluid channel of the cross flow heat exchanger in sequence to become dry air; the first evaporator and the first condenser comprise a plurality of fins which are arranged in parallel, the cross-flow heat exchanger adopts a plate type cross-flow heat exchanger, a hot fluid channel and a cold fluid channel of the cross-flow heat exchanger are formed by heat conducting flat plates which are arranged in parallel at intervals, and the heat conducting flat plates are arranged in an orthogonal mode with the fins of the first evaporator and/or the first condenser.
Description
Technical Field
The invention relates to the technical field of heat pump system design, in particular to a dehumidifying and drying heat pump unit and a dehumidifying and drying device.
Background
The heat pump is used as a heat carrier, and continuously absorbs heat of a low-temperature heat source through the evaporator and continuously releases the heat to a high-temperature heat source through the condenser.
In the dehumidification drying heat pump developed and popularized in recent years, drying airflow is in closed-loop circulation, the influence of low-temperature environment and day-night temperature fluctuation on the performance of the heat pump can be eliminated, the heat pump has high heating energy efficiency ratio, and the dehumidification drying heat pump is rapidly popularized.
In the dehumidifying and drying heat pump device, a fluorine path and an air path are operated in a combined manner, as shown in fig. 1:
1. wind path
High-temperature airflow produced by the heat pump condenser 02 enters a drying device under the driving of a fan to perform heat and humidity exchange with moisture-containing materials such as fresh tobacco leaves, and liquid moisture in the moisture-containing materials is evaporated into water vapor to form warm and humid return air; the warm and humid return air enters the heat pump evaporator 01 to be cooled and dehumidified, water vapor is filtered out, then the warm and humid return air enters the condenser again to be heated into high-temperature dry air, and the next round of circulation is started;
2. fluorine road
The refrigerant liquid in the copper pipe of the heat pump evaporator 01 passes through the pipe wall of the copper pipe and the outer fins of the pipe wall, absorbs the sensible heat of warm and wet return air and the latent heat of water vapor and is evaporated into a low-pressure gaseous refrigerant; the refrigerant gas is sucked and pressurized by the compressor to become high-temperature high-pressure refrigerant gas, then the high-temperature high-pressure refrigerant gas is sent to the condenser 02 copper pipe, and heat is released to low-temperature air from the evaporator 01 on the air path through the pipe wall and the pipe wall outer fins of the condenser 02 copper pipe; the high-pressure refrigerant gas which emits heat is condensed into refrigerating fluid, is throttled and decompressed, enters the copper pipe of the evaporator again, absorbs the sensible heat and the latent heat of water vapor of warm and wet return air to be evaporated into low-pressure gaseous refrigerant, and starts a new cycle;
the fluorine path and the air path jointly run, and the energy coupling of the fluorine path and the air path is realized through the condenser and the evaporator.
The later stage of the drying process is the main energy consumption stage of the dehumidifying and drying heat pump unit.
At the later stage of drying, the moisture evaporation capacity of moisture-containing materials such as fresh tobacco leaves is greatly reduced, the return air of the drying device is changed from early warm and wet return air into later-stage high-temperature dry air, at the moment, the moisture load of the evaporator of the dehumidification drying heat pump is reduced, the sensible heat load is increased, and the dehumidification amount of the evaporator is greatly reduced or even water cannot be filtered out.
Disclosure of Invention
The invention provides a dehumidification and drying heat pump unit with fins and a heat conduction flat plate orthogonally arranged, which aims to solve the problems in the prior art and comprises a first compressor, a first condenser, a first throttling device and a first evaporator, wherein the first compressor, the first condenser, the first throttling device and the first evaporator are sequentially connected to form a circulating system for circulating a refrigerant; a cross flow heat exchanger is arranged between the air inlet path and the air outlet path of the first evaporator, and wet air as air outlet of the drying device flows through a hot fluid channel of the cross flow heat exchanger, the first evaporator and a cold fluid channel of the cross flow heat exchanger in sequence to become dry air;
the first evaporator and the first condenser comprise a plurality of fins which are arranged in parallel, the cross-flow heat exchanger adopts a plate type cross-flow heat exchanger, a hot fluid channel and a cold fluid channel of the cross-flow heat exchanger are formed by heat conducting flat plates which are arranged in parallel at intervals, and the heat conducting flat plates are arranged in an orthogonal mode with the fins of the first evaporator and/or the first condenser.
In some embodiments, the cross-flow heat exchanger is disposed proximate to the air intake side of the first evaporator, and the thermal fluid channel is in direct communication with the first evaporator.
In some embodiments, the cross-flow heat exchanger is composed of a plurality of hot fluid channels and cold fluid channels which are arranged in parallel and are spaced from each other, and the flow direction of the air in the hot fluid channels is perpendicular to the flow direction of the air in the cold fluid channels.
The invention provides a dehumidification drying heat pump unit with fins orthogonal to a heat conduction flat plate, which comprises a shell, wherein the dehumidification drying heat pump unit assembly is arranged in the shell; wherein the content of the first and second substances,
the shell is provided with an air inlet and an air outlet, and a fan is arranged at the air outlet;
the first evaporator is arranged at the air outlet side of a hot fluid channel of the cross-flow heat exchanger or at the air inlet side of a cold fluid channel of the cross-flow heat exchanger, and the first condenser is arranged at the air outlet side of the cold fluid channel of the cross-flow heat exchanger; the plane of the cold fluid channel is vertical to the planes of the fins of the first evaporator and the first condenser;
after entering the shell from the air inlet, wet air serving as air outlet of the drying device flows through the hot fluid channel, the first evaporator, the cold fluid channel, the first condenser and the fan in sequence and is discharged from the air outlet.
After entering the shell from the air inlet, the wet air rotates on a horizontal plane and flows through the hot fluid channel of the cross-flow heat exchanger, the first evaporator, the cold fluid channel of the cross-flow heat exchanger, the first condenser and the fan in sequence and is discharged from the air outlet.
In some embodiments, a heater is further disposed between the first condenser and the fan.
The invention also provides a dehumidification and drying heat pump unit with fins orthogonal to the heat conduction flat plate, which comprises a shell, wherein a first heat pump unit is arranged in the shell, and the first heat pump unit adopts the dehumidification and drying heat pump unit assembly;
the shell is provided with an air inlet and an air outlet, and the air outlet is provided with a first fan;
the air outlet of the cross-flow heat exchanger is provided with a second fan;
and wet air serving as outlet air of the drying device enters the shell from the air inlet, one part of the wet air sequentially flows through the hot fluid channel of the cross-flow heat exchanger, the first evaporator and the cold fluid channel of the cross-flow heat exchanger to become dry air, and then is uniformly mixed with the other part of the wet air directly coming from the air inlet under the action of the second fan, then flows through the first condenser and finally is discharged from the air outlet.
In some embodiments, the first evaporator is arranged close to one side of the cross-flow heat exchanger to form a dehumidification module, the dehumidification module is arranged obliquely in the vertical direction, and the lower end of the first evaporator is provided with a water pan.
In some embodiments, the heat pump system further comprises a second heat pump unit, wherein the second heat pump unit comprises a second compressor, a second condenser, a second throttling device and a second evaporator, and the second compressor, the second condenser, the second throttling device and the second evaporator are sequentially connected to form a circulating system for circulating a refrigerant;
the second condenser is arranged at the air outlet;
an independent space communicated with ambient air is arranged in the shell, and the second evaporator is arranged in the independent space.
The dehumidification and drying heat pump unit with the fins and the heat conduction flat plate orthogonally arranged has the following advantages and positive effects compared with the prior art due to the adoption of the technical scheme:
1. improves the use efficiency of an evaporator and a condenser in the heat pump unit
In the dehumidification and drying heat pump unit with the heat-conducting flat plate of the plate-type cross-flow heat exchanger and the fins of the evaporator/condenser arranged in parallel in the prior art, the condition that the evaporator (and/or the condenser) generally has the effect that half of the fin channels have wind to effectively exchange heat with airflow, and the other half of the fin channels have small wind amount or almost no wind to effectively exchange heat with the airflow exists in operation, and the non-uniformity of airflow distribution among the fins of the evaporator (and/or the condenser) seriously influences the heat exchange capability of the evaporator (and/or the condenser) and the energy efficiency of the heat pump.
After the technology of orthogonally arranging the heat conducting flat plate and the two fins of the plate type cross-flow heat exchanger is adopted, the two fins are still vertically arranged, the heat conducting flat plate of the plate type cross-flow heat exchanger is horizontally arranged, and the air outlet of a plurality of horizontal hot fluid channels of the plate type cross-flow heat exchanger is uniformly extruded into the vertical fin gaps of an evaporator (and/or a condenser) of a heat pump unit in a horizontal strip-shaped jet flow mode at the speed of about 4 m/s; because the air volume at the position of the fin gap of the evaporator (and/or the condenser) opposite to the central connecting line of the horizontal channel of the hot fluid is large, the on-way resistance of the air flow passing through the fin gap at the position is large, and partial air flow is expanded to the upper side and the lower side with smaller on-way resistance in the vertical fin gap, so that all parts of the fins of the evaporator (and/or the condenser) are basically uniformly used, the use efficiency of the evaporator and the condenser in the heat pump unit is improved, and the performance of the heat pump unit is improved;
2. improve the dehumidification capacity of the evaporator and the drying capacity of the heat pump
The invention relates to a dehumidification and drying heat pump unit with a heat conduction flat plate of a plate-type cross-flow heat exchanger orthogonal to fins of an evaporator/condenser, wherein inlet air and outlet air of a heat pump evaporator are subjected to heat exchange through the heat conduction flat plate horizontally arranged in the cross-flow heat exchanger, low-temperature outlet air of the evaporator is utilized to cool high-temperature inlet air through a plurality of heat conduction flat plates so as to carry out precooling, the inlet air temperature of the evaporator is reduced, the inlet air relative humidity of the evaporator is improved, the sensible heat load of the evaporator is reduced, and the damp-heat load of the evaporator is improved, so that the dehumidification capacity of the evaporator and the drying capacity of.
3. Reduce the height of the dehumidifying and drying device
Compared with the dehumidification and drying heat pump unit in which the heat conduction flat plate of the plate-type cross-flow heat exchanger and the evaporator/condenser fins are arranged in parallel in the prior art, the dehumidification and drying heat pump unit in which the heat conduction flat plate of the plate-type cross-flow heat exchanger and the evaporator/condenser fins are orthogonal has the advantages that after entering the shell from the air inlet, wet air rotates on a horizontal plane instead of a vertical plane, and flows through the hot fluid channel of the cross-flow heat exchanger, the first evaporator, the cold fluid channel of the cross-flow heat exchanger, the first condenser and the fan in sequence and is discharged from the air outlet; the hot fluid channel, the first evaporator, the cold fluid channel, the first condenser and the connecting air channel of the cross-flow heat exchanger can be designed into equal-height parts, so that the height of the dehumidifying and drying device is effectively reduced.
Drawings
The above and other features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a dehumidifying and drying heat pump unit with closed air flow circulation in the prior art;
FIG. 2 is a schematic diagram of an inlet air pre-cooling outlet air reheating efficient dehumidification module in the prior art
FIG. 3 is a schematic view of a prior art arrangement of an evaporator and a cross-flow heat exchanger;
FIG. 4 is a horizontal cross-sectional view of an air inlet precooling air outlet reheating efficient dehumidification module in which a heat conduction flat plate of a plate-type cross-flow heat exchanger is parallel to evaporator fins in the prior art;
FIG. 5 is a schematic view of the arrangement of an evaporator and a cross-flow heat exchanger according to the present invention;
FIG. 6 is a vertical cross-sectional view of a cross-flow heat exchanger of a dehumidifying and drying heat pump unit in which condenser fins and a heat-conducting flat plate of a plate-type cross-flow heat exchanger are orthogonally arranged;
FIG. 7 is a schematic view of the dehumidifying and drying heat pump unit in embodiment 1;
fig. 8 is a schematic perspective view of the dehumidifying and drying heat pump unit in embodiment 2;
FIG. 9 is a longitudinal sectional view of the dehumidifying and drying heat pump unit in embodiment 2;
fig. 10 is a horizontal cross-sectional view of the dehumidifying and drying heat pump unit in embodiment 2.
Detailed Description
The present invention will be described in more detail below with reference to the accompanying drawings, which illustrate embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.
As shown in fig. 2-3, in order to solve the problems of "the moisture load of the heat pump evaporator is decreased and the sensible heat load is increased at the later stage of drying, the dehumidification capacity of the evaporator is greatly decreased and even the water cannot be filtered", in the prior art, the plate-type cross-flow heat exchanger 03 is generally added in the dehumidification and drying heat pump unit and is arranged between the air outlet and the air inlet of the evaporator 01, and the plate-type cross-flow heat exchanger 03, the evaporator 01, the fan 04 and the connecting air duct form an "air inlet precooling air outlet reheating high-efficiency dehumidification module";
when the heat exchanger operates, the inlet air and the outlet air of the evaporator in the module exchange heat through the plurality of heat conducting flat plates in the cross flow heat exchanger 3, the low-temperature outlet air of the evaporator 01 is utilized to cool the high-temperature inlet air through the plurality of heat conducting flat plates, the inlet air temperature of the evaporator is reduced, the inlet air relative humidity of the evaporator is improved, the sensible heat load of the evaporator 01 is reduced, the damp-heat load of the evaporator is improved, and therefore the dehumidification capacity of the evaporator and the drying capacity of the heat pump are improved.
Further, with reference to fig. 2 and 4, in the "air inlet precooling air outlet reheating high-efficiency dehumidification module" composed of the plate-type cross-flow heat exchanger, the evaporator, the fan and the connecting air duct, there is a problem of uneven distribution of air flow on the evaporator, which is a key problem affecting the dehumidification capability of the evaporator and the energy efficiency of the heat pump, and the reason for the problem and the formation are as follows:
the plate-type cross-flow heat exchanger 03 is generally formed by flanging and meshing hundreds of even thousands of heat-conducting flat plates (usually 0.15mm thick aluminum plates), the whole heat exchanger area is divided into a plurality of thin and wide hot fluid channels 031 and cold fluid channels 032, the hot fluid channels 031 and the cold fluid channels 032 are arranged at intervals, and the hot fluid flow direction and the cold fluid flow direction are intersected with each other to form a cross flow;
in the "air inlet precooling, air outlet reheating and high-efficiency dehumidification module" composed of the plate-type cross-flow heat exchanger 03, the evaporator 01, the fan 04 and the connecting air duct, because of the drainage requirement of the evaporator 01 and the plate-type cross-flow hot fluid channel condensed water, the structure that the evaporator fin and the plate-type cross-flow heat exchanger heat-conducting flat plate stand vertically is usually made; an outlet of a hot fluid channel 031 of a plate-type cross-flow heat exchanger is connected with an air inlet of an evaporator 01;
fig. 4 is a horizontal cross-sectional view of a plate-type cross-flow heat exchanger and an evaporator, in the horizontal cross-sectional view, a heat-conducting flat plate in a right plate-type cross-flow heat exchanger divides a volume space of the heat exchanger into a plurality of hot fluid channels and cold fluid channels which are sequentially alternated along a horizontal direction; drying return air at the later stage of drying horizontally enters a plurality of vertically arranged hot fluid channels of the plate-type cross-flow heat exchanger, the low-temperature outlet air of the evaporator of the vertically arranged cold fluid channels (represented by 3 'round points' in an oval dotted line in the figure) at intervals is precooled, the temperature is reduced, the relative humidity is improved, then the low-temperature outlet air horizontally enters the evaporator to be cooled and dehumidified, the low-temperature outlet air of the evaporator after being dehumidified firstly enters the vertical cold fluid channels of the heat exchanger leftwards, then downwards (represented by 3 'x' in the oval dotted line in the figure), then horizontally rightwards and upwards (represented by 3 'round points' in the 6 polygon in the figure), the horizontally dried return air of the vertically arranged hot fluid channels at intervals is reheated, and finally the inlet air, precooled outlet air and reheated hot high-efficiency dehumidifying module;
in the plate-type cross-flow heat exchanger, the hot fluid channel 031 (drawing streamline area) and the cold fluid channel 032 (drawing circle point area) which are arranged at intervals equally divide the volume of the whole heat exchanger, and the sum of the air flow cross-sectional areas in all the hot fluid channels is only 1/2 of the equidirectional cross-sectional area (namely the cross-sectional area of the air path inlet of the left evaporator) of the whole heat exchanger, so that the air outlet speed of the hot fluid channel reaches 2 times of the wind speed calculated according to the air inlet cross-section of the evaporator, namely reaches about 4m/s (the general design wind speed of the evaporator is 2 m; the air flow with the speed reaching 4m/s has higher dynamic pressure head and speed inertia, and flows out of the hot fluid channel and then rushes into the channel between the fins of the evaporator in a jet flow mode; the fin pitch of the heat conducting flat plate of the plate type cross-flow heat exchanger is generally about 3.5mm, the fin pitch of the evaporator is generally about 1.7mm, and the horn-shaped outlets of 1 hot fluid channel generally cover 4 evaporator fin channels; therefore, the channels among the fins of the evaporator, into which the hot fluid channel airflow of each plate-type cross-flow heat exchanger is flushed, are necessarily 2 channels which are opposite to the jet flow, and the 2 fin channels on the outer side are in a state that the air volume is very small or even basically no wind exists, and the heat absorption refrigeration and cooling dehumidification can not be effectively carried out.
The condition that wind in the fin channels of the evaporator is capable of effectively absorbing heat for refrigeration and cooling and dehumidifying air flow, and the fin channels on the outer side are in the condition that the wind amount is very small or even basically no wind is available, and the heat absorption for refrigeration and cooling and dehumidifying air flow can not be effectively performed is solved, and the heat absorption, refrigeration and cooling and dehumidifying air flow can be effectively absorbed by the wind in half of the fin channels, and the heat absorption, refrigeration and cooling and dehumidifying air flow can not be effectively absorbed by the wind in half of the fin channels.
The invention provides a dehumidification drying heat pump unit aiming at the technical problem, which comprises a first compressor, a first condenser, a first throttling device and a first evaporator, wherein the first compressor, the first condenser, the first throttling device and the first evaporator are sequentially connected to form a circulating system for circulating a refrigerant; a cross flow heat exchanger is arranged between the air inlet path and the air outlet path of the first evaporator, and wet air as air outlet of the drying device flows through a hot fluid channel of the cross flow heat exchanger, the first evaporator and a cold fluid channel of the cross flow heat exchanger in sequence to become dry air; as shown in fig. 5 to 6, the first evaporator 3 and the first condenser include a plurality of fins arranged in parallel, the cross-flow heat exchanger 2 is a plate-type cross-flow heat exchanger, the hot fluid channel 201 and the cold fluid channel 202 of the cross-flow heat exchanger are composed of heat conducting flat plates arranged in parallel at intervals, and the heat conducting flat plates are arranged orthogonally (i.e., arranged vertically to each other) with the fins of the first evaporator 3 and/or the first condenser.
Wherein, the cross flow heat exchanger 2 is arranged close to the air inlet side of the first evaporator 3, and the hot fluid channel 201 is directly communicated with the first evaporator 3.
The cross-flow heat exchanger 2 is composed of a plurality of hot fluid channels 201 and cold fluid channels 202 which are arranged in parallel at intervals, and the flowing direction of air in the hot fluid channels is perpendicular to that of air in the cold fluid channels.
The invention provides a dehumidifying and drying heat pump unit, which adopts drying airflow closed cycle and drying return air heat recovery, wherein two heat pump (evaporator and/or condenser) fins are vertically arranged, a plate type cross flow heat exchanger heat conduction flat plate for pre-cooling high temperature inlet air by using low temperature outlet air of the evaporator is horizontally arranged, and the cross flow heat exchanger, the evaporator, the condenser, a fan and a communicating air channel form an inlet and outlet air heat exchange module with openings at two ends;
when the drying device operates, wet air serving as air outlet of the drying device horizontally enters a horizontal hot fluid channel 201 of the cross-flow heat exchanger 2, is pre-cooled by low-temperature air outlet of an evaporator of a horizontal cold fluid channel arranged at intervals, the temperature of air flow is reduced, the relative humidity is improved, and then the air flow enters an evaporator 3 with vertically arranged fins on the horizontal plane to be cooled and dehumidified; the low-temperature air after being cooled and dehumidified horizontally enters a horizontal cold fluid channel of the cross-flow heat exchanger, is reheated by air intake of an evaporator 3 of the horizontal hot fluid channel arranged at intervals, flows out of the cold fluid channel, is further heated into high-temperature dry air by a condenser, and finally is discharged out of the unit to start a new cycle. The dehumidification and drying heat pump unit with the fins orthogonal to the heat conduction flat plate is suitable for various dehumidification and drying devices, and the internal structure form can be flexibly adjusted as long as the core characteristics of the evaporator and/or condenser fins orthogonal to the heat conduction flat plate of the plate-type cross-flow heat exchanger are kept.
The dehumidification and drying heat pump unit provided by the invention has the following advantages:
1. improves the use efficiency of an evaporator and a condenser in the heat pump unit
In the dehumidification and drying heat pump unit with the heat-conducting flat plate of the plate-type cross-flow heat exchanger and the fins of the evaporator/condenser arranged in parallel in the prior art, the condition that the evaporator (and/or the condenser) generally has the effect that half of the fin channels have wind to effectively exchange heat with airflow, and the other half of the fin channels have small wind amount or almost no wind to effectively exchange heat with the airflow exists in operation, and the non-uniformity of airflow distribution among the fins of the evaporator (and/or the condenser) seriously influences the heat exchange capability of the evaporator (and/or the condenser) and the energy efficiency of the heat pump.
After the technology of orthogonally arranging the heat conducting flat plate and the two fins of the plate type cross-flow heat exchanger is adopted, the two fins are still vertically arranged, the heat conducting flat plate of the plate type cross-flow heat exchanger is horizontally arranged, and the air outlet of a plurality of horizontal hot fluid channels of the plate type cross-flow heat exchanger is uniformly extruded into the vertical fin gaps of an evaporator (and/or a condenser) of a heat pump unit in a horizontal strip-shaped jet flow mode at the speed of about 4 m/s; because the air volume at the position of the fin gap of the evaporator (and/or the condenser) opposite to the central connecting line of the horizontal channel of the hot fluid is large, the on-way resistance of the air flow passing through the fin gap at the position is large, and partial air flow is expanded to the upper side and the lower side with smaller on-way resistance in the vertical fin gap, so that all parts of the fins of the evaporator (and/or the condenser) are basically uniformly used, the use efficiency of the evaporator and the condenser in the heat pump unit is improved, and the performance of the heat pump unit is improved;
2. improve the dehumidification capacity of the evaporator and the drying capacity of the heat pump
The invention relates to a dehumidification and drying heat pump unit with a heat conduction flat plate of a plate-type cross-flow heat exchanger orthogonal to fins of an evaporator/condenser, wherein inlet air and outlet air of a heat pump evaporator are subjected to heat exchange through the heat conduction flat plate horizontally arranged in the cross-flow heat exchanger, low-temperature outlet air of the evaporator is utilized to cool high-temperature inlet air through a plurality of heat conduction flat plates so as to carry out precooling, the inlet air temperature of the evaporator is reduced, the inlet air relative humidity of the evaporator is improved, the sensible heat load of the evaporator is reduced, and the damp-heat load of the evaporator is improved, so that the dehumidification capacity of the evaporator and the drying capacity of.
3. Reduce the height of the dehumidifying and drying device
Compared with the dehumidification and drying heat pump unit in which the heat conduction flat plate of the plate-type cross-flow heat exchanger and the evaporator/condenser fins are arranged in parallel in the prior art, the dehumidification and drying heat pump unit in which the heat conduction flat plate of the plate-type cross-flow heat exchanger and the evaporator/condenser fins are orthogonal has the advantages that after entering the shell from the air inlet, wet air rotates on a horizontal plane instead of a vertical plane, and flows through the hot fluid channel of the cross-flow heat exchanger, the first evaporator, the cold fluid channel of the cross-flow heat exchanger, the first condenser and the fan in sequence and is discharged from the air outlet; the hot fluid channel, the first evaporator, the cold fluid channel, the first condenser and the connecting air channel of the cross-flow heat exchanger can be designed into equal-height parts, so that the height of the dehumidifying and drying device is effectively reduced.
The following further description is made with respect to specific embodiments:
embodiment 1 a bathroom dehumidification stoving heat pump set
Referring to fig. 7, the embodiment provides a dehumidification and drying heat pump unit for a toilet, which includes a housing 1, the housing 1 is provided with an air inlet 101 and an air outlet, the air outlet is provided with a fan 6, and a dehumidification and drying heat pump unit assembly is arranged in the housing.
Specifically, the bathroom dehumidification and drying heat pump unit comprises a first compressor 5, a first condenser 4, a first throttling device and a first evaporator 3, wherein the first compressor 5, the first condenser 4, the first throttling device and the first evaporator 3 are sequentially connected to form a circulating system for circulating a refrigerant; a cross flow heat exchanger 2 is arranged between the air inlet path and the air outlet path of the first evaporator 3, and the wet air as the outlet air in the drying process of the toilet flows through the hot fluid channel 201 of the cross flow heat exchanger 2, the first evaporator 3 and the cold fluid channel of the cross flow heat exchanger 2 in sequence to become dry air.
In the present embodiment, the first evaporator 3 is arranged on the air outlet side of the hot fluid channel 201 of the cross-flow heat exchanger 2 or on the air inlet side of the cold fluid channel 202 of the cross-flow heat exchanger 2, and the first condenser 4 is arranged on the air outlet side of the cold fluid channel 202 of the cross-flow heat exchanger; and the first evaporator 3 and the first condenser 4 are arranged close to the cross-flow heat exchanger 2, so that the first evaporator 3 and the first condenser 4 are directly communicated with the cold fluid channel 202 of the cross-flow heat exchanger 2, and the hot fluid channel 201 of the cross-flow heat exchanger 2 is used for communicating the air inlet side of the first evaporator 3 through the communication channel 8.
The first evaporator 3 and the first condenser 4 comprise a plurality of fins which are arranged in parallel; the cross-flow heat exchanger 2 is composed of a plurality of hot fluid channels 201 and cold fluid channels 202 which are arranged in parallel at intervals, and the flow direction of air in the hot fluid channels is vertical to the flow direction of air in the cold fluid channels in the horizontal direction; the cross-flow heat exchanger 2 is a plate-type cross-flow heat exchanger, the hot fluid channel 201 and the cold fluid channel 202 are formed by heat conducting flat plates arranged in parallel at intervals, and the heat conducting flat plates of the cold fluid channel 202, the first evaporator 3 and the fins of the first condenser 4 are arranged orthogonally (i.e. arranged vertically).
In this embodiment, a heater 7 is further disposed between the first condenser 4 and the fan 6, and in the early stage of dehumidification and drying, the heater 7 is used for circularly preheating the dry air in the toilet to raise the temperature of the whole toilet space; in the dehumidifying and drying process, the heater 7 is used to further heat the drying air output from the first condenser, thereby obtaining high-temperature drying air.
The dehumidification drying device that this embodiment provided is applicable to the dehumidification stoving of occasions such as bathroom, adopts the bathroom space top to induced draft, the top mode of airing exhaust, preheats, heats, the dehumidification stoving to bathroom space air, beats bathroom space and causes the energy space that has the tristate function of bathing heating temperature rise in winter, bathing cooling dehumidification stuffiness prevention in summer, four seasons bathroom space dehumidification stoving.
The concrete during operation:
after the bathroom dehumidification and drying heat pump unit is installed, the fins of the first evaporator are in a vertical state (so that water drops collected on the fins slide off), wet air serving as bathroom drying air outlet horizontally enters the horizontal hot fluid channel 201 of the cross-flow heat exchanger 2 from the air inlet 101 and rotates on the horizontal plane all the time, the wet air is cooled and precooled by low-temperature air outlet of the evaporator in the horizontal cold fluid channel 202 arranged at intervals, the air flow temperature is reduced, the relative humidity is improved, and then the wet air enters the first evaporator 3 with the vertically arranged fins on the horizontal plane for further cooling and dehumidification; the low-temperature air after being cooled and dehumidified horizontally enters the horizontal cold fluid channel 202 of the cross-flow heat exchanger, is reheated by the air inlet of the evaporator of the horizontal hot fluid channel 202 arranged at intervals, flows out of the cold fluid channel 202, is further heated by the first condenser 4 to form high-temperature dry air, is further heated by the heater 7, is finally discharged out of the unit, and enters the toilet again to start a new cycle.
Referring to fig. 8 to 10, the embodiment provides a tobacco leaf dehumidifying and drying heat pump device with evaporator fins and a heat conducting flat plate of a plate-type cross-flow heat exchanger orthogonally arranged, which includes a housing 1, the housing 1 is provided with an air inlet 101 and an air outlet 102, the air outlet 102 is provided with a first fan 6, and the housing 1 is provided with a first heat pump unit.
The first heat pump unit comprises a first compressor 5, a first condenser 4, a first throttling device and a first evaporator 3, wherein the first compressor 5, the first condenser 4, the first throttling device and the first evaporator 3 are sequentially connected to form a circulating system for circulating a refrigerant; a cross-flow heat exchanger 2 is arranged between the air inlet path and the air outlet path of the first evaporator 3, and an air outlet of the cross-flow heat exchanger is provided with a second fan 10; the wet air as the outlet air of the tobacco flue-curing house enters the shell 1 from the air inlet, a part of the wet air flows through the hot fluid channel 201 of the cross-flow heat exchanger 2, the first evaporator 3 and the cold fluid channel 202 of the cross-flow heat exchanger 2 in sequence to become dry air, then under the action of the second fan 10, the dry air and the other part of the wet air directly from the air inlet 101 are mixed uniformly, then flow through the first condenser 4, and finally are discharged from the air outlet 102 under the action of the first fan 6.
The first evaporator 3 and the first condenser 4 comprise a plurality of fins which are arranged in parallel; the cross-flow heat exchanger 2 is composed of a plurality of hot fluid channels 201 and cold fluid channels 202 which are arranged in parallel at intervals, and the flow direction of air in the hot fluid channels is vertical to that of air in the cold fluid channels in the horizontal direction; the cross-flow heat exchanger 2 is a plate-type cross-flow heat exchanger, the hot fluid channel 201 and the cold fluid channel 202 are formed by heat conducting flat plates arranged in parallel at intervals, and the heat conducting flat plates of the cold fluid channel 202 and the fins of the first evaporator 3 are arranged orthogonally (i.e. perpendicular to each other) in this embodiment.
In this embodiment, the hot fluid channel 201 of the cross-flow heat exchanger 2, the first evaporator 3, the cold fluid channel 202 of the cross-flow heat exchanger 2, the second fan 10 and the connecting air duct together form a dehumidification module, the dehumidification module is integrally and slightly inclined in the vertical direction, and the lower end of the first evaporator 3 is provided with the water pan 9, so that water droplets collected on the hot fluid channel 201 of the cross-flow heat exchanger 2 and the first evaporator 3 flow into the water pan 9 under the action of their own gravity and are then discharged.
The tobacco leaf dehumidification and drying heat pump equipment with the evaporator fins and the plate-type cross-flow heat exchanger heat conduction flat plates which are orthogonally arranged is arranged side by side with a tobacco flue-curing house tobacco loading chamber, and an air outlet and an air inlet of the tobacco flue-curing house tobacco loading chamber are respectively communicated with an air inlet 101 and an air outlet 102 of the tobacco leaf dehumidification and drying heat pump equipment with the evaporator fins and the plate-type cross-flow heat exchanger heat conduction flat plates which are orthogonally arranged, so that drying air flow circulation is realized.
According to the tobacco leaf dehumidifying and drying heat pump device with the evaporator fins and the heat conducting flat plate of the plate-type cross-flow heat exchanger which are orthogonally arranged, an internal dehumidifying internal heating heat pump subsystem is formed in the tobacco leaf dehumidifying and drying heat pump device, sensible heat hedging is realized between inlet air and outlet air of the evaporator through the plate-type cross-flow heat exchanger, the return air of a tobacco flue-curing house is precooled by the low-temperature outlet air of a first evaporator entering a cold fluid channel due to the fact that the return air of the tobacco flue-curing house is high in relative humidity and even close to saturation in early and middle stages of tobacco leaf curing (namely the dehumidifying module formed by the first evaporator and the cross-flow heat exchanger), and the temperature of the return air of the tobacco flue-curing house is possibly lower than the saturation temperature in the advancing process of the hot fluid channel, so that; on the tobacco leaf dehumidification drying heat pump unit longitudinal section (as shown in fig. 9) that the fin of first evaporimeter and plate cross-flow heat exchanger heat conduction flat board quadrature set up, partial roast room return air gets into the horizontal hot-fluid passageway of plate cross-flow heat exchanger, rotates on the plane of basic level: in the process that return air of the tobacco flue-curing house travels leftwards in a hot fluid channel, precooling is carried out by the low-temperature outlet air of the evaporator in a cold channel represented by each row of 4 round dots, the return air continues to travel leftwards in the hot fluid channel, and the return air enters a first evaporator for deep dehumidification after the temperature is reduced and the relative humidity is increased; the dehumidified first evaporator is discharged at low temperature, continues to go leftward and then inward (as shown in the figure)
Shown), bypasses the inner dehumidification evaporator side plates, then goes to the right, and then enters the cold channel (represented by 4 dots in each row) of the plate-type cross-flow heat exchanger; in the cold fluid channel, the low-temperature air outlet of the first evaporator continues to move forwards, is reheated by the return air of the tobacco curing barn in the hot fluid channel, is finally sucked and discharged by the second fan, is sent to the first condenser to be further heated into dry air flow, is sent to the tobacco curing barn tobacco loading chamber again, and starts a new cycle.
In this embodiment, the system further comprises a second heat pump unit, the second heat pump unit comprises a second compressor, a second condenser 11, a second throttling device and a second evaporator 13, and the second compressor, the second condenser 11, the second throttling device and the second evaporator 13 are sequentially connected to form another set of circulation system for circulating the refrigerant; the second condenser 11 is arranged at the air outlet 102; further, the second condenser 11 is disposed between the first condenser 4 and the air outlet 102, but in other embodiments, the second condenser 11 may also be disposed between the first condenser 4 and the cross-flow heat exchanger, and the like, as long as the outlet air is ensured to pass through the second condenser 11, which is not limited herein.
Further, an independent space 103 communicated with the ambient air is arranged in the housing 1, the second evaporator 13 is arranged in the independent space 103, and the circulation of air between the independent space 103 and the ambient air is realized under the action of the third fan 12.
The second evaporator in the second heat pump unit provided by the embodiment heats the refrigerant flowing through the evaporator by using the air in the environment, so that external heat absorption and internal heating are realized, the second evaporator and the first heat pump unit (internal dehumidification and internal heating) are matched for use, and the drying and dehumidifying efficiency is greatly improved.
It will be appreciated by those skilled in the art that the invention can be embodied in many other specific forms without departing from the spirit or scope thereof. Although embodiments of the present invention have been described, it is to be understood that the present invention should not be limited to those precise embodiments, and that various changes and modifications can be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined by the appended claims.
Claims (8)
1. A dehumidification and drying heat pump unit with fins orthogonal to a heat conduction flat plate is characterized by comprising a first compressor, a first condenser, a first throttling device and a first evaporator, wherein the first compressor, the first condenser, the first throttling device and the first evaporator are sequentially connected to form a circulating system for circulating a refrigerant; a cross flow heat exchanger is arranged between the air inlet path and the air outlet path of the first evaporator, and wet air as air outlet of the drying device flows through a hot fluid channel of the cross flow heat exchanger, the first evaporator and a cold fluid channel of the cross flow heat exchanger in sequence to become dry air;
the first evaporator and the first condenser comprise a plurality of fins which are arranged in parallel, the cross-flow heat exchanger adopts a plate type cross-flow heat exchanger, a hot fluid channel and a cold fluid channel of the cross-flow heat exchanger are formed by heat conducting flat plates which are arranged in parallel at intervals, and the heat conducting flat plates are arranged in an orthogonal mode with the fins of the first evaporator and/or the first condenser.
2. The heat pump unit of claim 1, wherein the cross-flow heat exchanger is disposed adjacent to an air inlet side of the first evaporator, and the thermal fluid channel is directly connected to the first evaporator.
3. The heat pump unit of claim 1, wherein the cross-flow heat exchanger comprises a plurality of hot fluid channels and a plurality of cold fluid channels arranged in parallel and in a spaced manner, and the flow direction of air in the hot fluid channels is perpendicular to the flow direction of air in the cold fluid channels.
4. A dehumidification and drying heat pump unit with fins orthogonal to a heat conduction flat plate is characterized by comprising a shell, wherein the shell is internally provided with a dehumidification and drying heat pump unit assembly as claimed in any one of claims 1 to 3; wherein the content of the first and second substances,
the shell is provided with an air inlet and an air outlet, and a fan is arranged at the air outlet;
the first evaporator is arranged at the air outlet side of a hot fluid channel of the cross-flow heat exchanger or at the air inlet side of a cold fluid channel of the cross-flow heat exchanger, and the first condenser is arranged at the air outlet side of the cold fluid channel of the cross-flow heat exchanger; the plane of the cold fluid channel is vertical to the planes of the fins of the first evaporator and the first condenser;
after entering the shell from the air inlet of the dehumidification and drying heat pump unit, the wet air serving as the outlet air of the drying device flows through the hot fluid channel, the first evaporator, the cold fluid channel, the first condenser and the fan in sequence and is discharged from the air outlet.
5. A dehumidifying and drying heat pump device with fins orthogonal to the heat-conducting flat plate as claimed in claim 4, wherein a heater is further disposed between the first condenser and the fan.
6. A dehumidification and drying heat pump unit with fins orthogonal to a heat conduction flat plate is characterized by comprising a shell, wherein a first heat pump unit is arranged in the shell, and the first heat pump unit adopts the dehumidification and drying heat pump unit assembly as claimed in any one of claims 1 to 3;
the shell is provided with an air inlet and an air outlet, and the air outlet is provided with a first fan;
the air outlet of the cross-flow heat exchanger is provided with a second fan;
and wet air serving as outlet air of the drying device enters the shell from an air inlet of the dehumidifying and drying heat pump unit, one part of the wet air sequentially flows through a hot fluid channel of the cross-flow heat exchanger, the first evaporator and a cold fluid channel of the cross-flow heat exchanger to become dry air, and then is uniformly mixed with the other part of the wet air directly from the air inlet under the action of the second fan, flows through the first condenser and is finally discharged from the air outlet.
7. The heat pump unit of claim 6, wherein the first evaporator is disposed adjacent to one side of the cross-flow heat exchanger to form a dehumidification module, the dehumidification module is disposed in a vertical inclined manner, and a water pan is disposed at a lower end of the first evaporator.
8. The heat pump unit of claim 6, further comprising a second heat pump unit, wherein the second heat pump unit comprises a second compressor, a second condenser, a second throttling device and a second evaporator, and the second compressor, the second condenser, the second throttling device and the second evaporator are sequentially connected to form a circulation system for circulating a refrigerant;
the second condenser is arranged at an air outlet of the dehumidification drying heat pump unit;
an independent space communicated with ambient air is arranged in the shell, and the second evaporator is arranged in the independent space.
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