CN106091181B - High-efficiency dehumidification system - Google Patents
High-efficiency dehumidification system Download PDFInfo
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- CN106091181B CN106091181B CN201610644599.1A CN201610644599A CN106091181B CN 106091181 B CN106091181 B CN 106091181B CN 201610644599 A CN201610644599 A CN 201610644599A CN 106091181 B CN106091181 B CN 106091181B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F3/1405—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
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Abstract
The invention relates to the field of dehumidifiers, in particular to a high-efficiency dehumidification system, which comprises a shell, a first air inlet, a first evaporator, a first condenser, a second evaporator, a second condenser, an air supply mechanism, an air outlet and a water receiving disc, wherein the first air inlet is formed in one side of the shell and used for allowing outside air to enter, the first evaporator is sequentially arranged in the shell and used for liquefying water vapor in the air for the first time, the first condenser is used for heating the air for the first time, the second evaporator is used for liquefying the water vapor in the air for the second time, the second condenser is used for heating the air for the second time, the air supply mechanism is used for guiding the air, the air outlet is formed in one side, close to the air supply mechanism, of the shell and used for discharging dehumidified air, and the water receiving disc is connected to the first evaporator and the second evaporator; the first evaporator surface temperature is equal to the outside air dew point temperature. The invention has strong dehumidification capability, high energy efficiency and low loss, and is beneficial to energy conservation and environmental protection.
Description
Technical Field
The invention relates to the field of dehumidifiers, in particular to a high-efficiency dehumidifying system.
Background
The dehumidifier is a device which introduces the humid air in the room into the cabinet, reduces the humidity through a heat exchanger composed of an evaporator and a condenser with flowing refrigerants, and discharges the dehumidified air into the room, thereby achieving the purpose of reducing the indoor humidity.
In the dehumidifier in the prior art, after outside air enters the dehumidifier, the outside air is heated by the evaporator, and because the surface temperature of the evaporator is the dew point temperature of the air, water vapor in the air at the contact part with the surface of the evaporator is condensed into water drops, so that the aim of dehumidification is fulfilled.
The dehumidifier of the type has the following defects that on one hand, air is evaporated once in the dehumidification process, and a single evaporator cannot fully exchange heat with indoor air due to the heat exchange area, so that the heat exchange temperature difference with the indoor air is large, the evaporation pressure of the evaporator is low, the pressure ratio of the compressor is large, the power consumption of the compressor is also large, the dehumidification capacity is poor, and on the other hand, if the dehumidification capacity is required to be ensured, the heat load of the compressor during refrigeration needs to be improved, so that the dehumidifier is low in energy efficiency, high in loss and not beneficial to energy conservation and environmental protection.
Disclosure of Invention
In order to solve the problems, the invention provides the efficient dehumidification system which is strong in dehumidification capacity, high in energy efficiency, low in loss and beneficial to energy conservation and environmental protection.
The technical scheme adopted by the invention is as follows: the efficient dehumidification system comprises a shell, a first air inlet, a first evaporator, a first condenser, a second evaporator, a second condenser, an air supply mechanism, an air outlet and a water receiving disc, wherein the first air inlet is formed in one side of the shell and used for allowing outside air to enter, the first evaporator is sequentially arranged in the shell and used for liquefying water vapor in the air for the first time, the first condenser is used for heating the air for the first time, the second evaporator is used for liquefying the water vapor in the air for the second time, the second condenser is used for heating the air for the second time, the air supply mechanism is used for guiding the air, the air outlet is formed in one side, close to the air supply mechanism, of the shell and used for discharging dehumidified air, and the water receiving disc is connected to the first evaporator and the second evaporator; the first evaporator surface temperature is equal to the outside air dew point temperature.
The technical proposal is further improved in that the shell is provided with a second air inlet which is communicated with a gap between the first evaporator and the first condenser.
The technical proposal is further improved in that the first evaporator is a coil evaporator.
The technical scheme is further improved in that the distance between the coils of the first evaporator is adjustable, the distance between the coils of the first evaporator is L, the surface wind speed of the first evaporator is V1, and the relationship between the coil distance and the surface wind speed is 4.5 alpha logV1, wherein alpha is not less than 20 and not more than 30.
The technical scheme is further improved in that the surface temperature of the first evaporator is higher than that of the second evaporator, the surface temperature of the first condenser is lower than that of the second condenser, and the surface wind speed of the first evaporator is higher than that of the second evaporator.
The technical scheme is further improved in that filter screens for filtering air are arranged on windward sides of the first air inlet and the second air inlet.
The invention has the beneficial effects that:
1. under the drainage action of the air supply mechanism, external wet air enters the inside of the shell through the first air inlet and reaches the surface of the first evaporator, because the surface temperature of the first evaporator is equal to the dew point temperature of the external air, the air temperature is reduced, water vapor in the air, which is directly contacted with the surface of the first evaporator, is condensed into water drops to realize primary dehumidification, the air after primary dehumidification enters the first condenser, is heated by the first condenser, the air temperature is raised through primary heat exchange, the air with the raised temperature enters the second evaporator again, the water vapor in the air is condensed into water drops again to realize secondary dehumidification, the air after secondary dehumidification enters the second condenser, is heated by the second condenser to become dry hot air through secondary heat exchange, and the dry hot air after secondary dehumidification and secondary heating is discharged through the air outlet under the action of the air supply mechanism, and meanwhile, the condensed water drops in the first evaporator and the second evaporator flow into the water receiving tray. On one hand, the multi-stage dehumidification system is formed by two times of dehumidification and two times of heating, the dehumidification capacity is strong, on the other hand, more water vapor in the air is condensed into water drops by reducing the dew point temperature of the air, the energy efficiency is high, the loss is low, and the energy conservation and the environmental protection are facilitated.
2. The second air inlet is formed in the shell, the second air inlet is communicated with a gap between the first evaporator and the first condenser, new outside air is introduced after the air is dehumidified for the first time, the new humid cold air is mixed with the air dehumidified for the first time to become humid cold air with lower temperature, the dew point temperature of the second evaporator is favorably reduced, water vapor is more fully condensed into water drops, and the dehumidification efficiency is improved.
3. The first evaporator is a coil evaporator, when air flows through the surface of the coil evaporator, part of water vapor in the air in direct contact with the coil evaporator can be condensed into water drops, the water vapor in the air not in direct contact can continuously move forwards, and the air temperature is higher than that of the coil evaporator, so that the overall temperature of the air is reduced after the air and the coil evaporator are subjected to heat exchange, the dew point temperature of subsequent air is favorably reduced, the cold quantity generated in dehumidification is fully utilized, the dehumidification capacity is further improved, the heat load of a compressor in refrigeration is reduced, and the purposes of efficient refrigeration and dehumidification are achieved.
4. The distance between the coils of the first evaporator is adjustable, the distance between the coils of the first evaporator is L, the surface wind speed of the first evaporator is V1, the relationship between the distance between the coils and the surface wind speed is L4.5 alpha logV1, wherein alpha is not less than 20 and not more than 30, and the proper distance between the coils is selected according to the difference of the surface wind speeds of the first evaporator, so that the dew point temperature of air can be reduced to the maximum extent, and the dehumidification effect is guaranteed to be the best.
5. The surface temperature of the first evaporator is higher than that of the second evaporator, the surface temperature of the first condenser is lower than that of the second condenser, and the surface wind speed of the first evaporator is higher than that of the second evaporator. The surface temperature of the first evaporator is the same as the dew point temperature of the outside air, the surface temperature of the second evaporator is the same as the dew point temperature of the mixed air after mixing and first heating, the dew point temperature of the mixed air is reduced, so the surface temperature of the second evaporator is lower, the water vapor is conveniently and fully condensed into water drops, the dehumidification effect is improved, the temperatures of the two evaporators are different, the cascade utilization of energy is realized, the average heat exchange temperature difference between the air and a refrigerant is reduced by cooling and dehumidifying for two times, the evaporation pressure of the evaporator is reduced, the pressure ratio of a compressor is reduced, the power consumption of the compressor is reduced, and therefore the energy efficiency of the dehumidification system is improved.
6. The windward side of first air intake and second air intake all is equipped with and is used for carrying out filterable filter screen to the air, filters the air that gets into the casing inside through the filter screen for exhaust air is clean air after the dehumidification, plays air purification's effect, is favorable to the health.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of a first evaporator of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to fig. 2, a schematic structural diagram of the present invention and a schematic structural diagram of the first evaporator are shown, respectively.
The efficient dehumidification system 100 comprises a shell 110, a first air inlet 111 arranged at one side of the shell 110 and used for allowing outside air to enter, a first evaporator 130, a first condenser 140, a second evaporator 150, a second condenser 160, an air supply mechanism 170, an air outlet 112 and a water receiving tray 120, wherein the first evaporator 130, the first condenser 140, the second evaporator 150, the second condenser 160, the air supply mechanism 170 and the water receiving tray are sequentially arranged inside the shell 110 and used for liquefying water vapor in air for the first time, the first condenser 140 is used for heating air for the first time, the second evaporator 150 is used for liquefying water vapor in air for the second time, the second condenser 160 is used for heating air for the second time, the air supply mechanism 170 is used for guiding air, the air outlet 112 is arranged at one side, close to the air supply mechanism 170, is used for discharging dehumidified air, and the water receiving tray 120 is connected to the first evaporator 130 and the second evaporator 150; the surface temperature of the first evaporator 130 is equal to the dew point temperature of the external air.
Under the drainage action of the air supply mechanism 170, the external humid air enters the inside of the housing 110 through the first air inlet 111 and reaches the surface of the first evaporator 130, because the surface temperature of the first evaporator 130 is equal to the dew point temperature of the external air, the air temperature is reduced, the water vapor in the air directly contacting with the surface of the first evaporator 130 is condensed into water drops, the first dehumidification is realized, the air after the first dehumidification enters the first condenser 140, the air is heated by the first condenser 140, the air temperature is raised through the first heat exchange, the air with the raised temperature enters the second evaporator 150, the water vapor in the air is condensed into water drops again, the second dehumidification is realized, the air after the second dehumidification enters the second condenser 160, the air is heated by the second condenser 160 and becomes dry hot air through the second heat exchange, the dry hot air after the two dehumidifications and the two heats is discharged through the air outlet 112 under the action of the air supply mechanism 170, while the condensed water droplets in the first and second evaporators 130 and 150 flow into the drip tray 120. On one hand, the multi-stage dehumidification system 100 is formed by two times of dehumidification and two times of heating, the dehumidification capacity is strong, on the second hand, more water vapor in the air is condensed into water drops by reducing the dew point temperature of the air, the energy efficiency is high, the loss is low, and the energy conservation and the environmental protection are facilitated.
The second air inlet 113 is formed in the housing 110, the second air inlet 113 is communicated with a gap between the first evaporator 130 and the first condenser 140, new outside air is introduced after the air is dehumidified for the first time, the new humid cold air is mixed with the air dehumidified for the first time to become humid cold air with lower temperature, which is beneficial to reducing the dew point temperature of the air entering the second evaporator 150, so that water vapor is more fully condensed into water drops, and the dehumidification efficiency is improved.
The first evaporator 130 is a coil evaporator, when air flows through the surface of the coil evaporator, part of water vapor in the air directly contacting with the coil evaporator can be condensed into water drops, and the water vapor in the air not directly contacting with the coil evaporator can continuously move forwards.
The distance between the coils of the first evaporator 130 is adjustable, the coil distance 131 of the first evaporator 130 is L, the surface wind speed of the first evaporator 130 is V1, the relationship between the coil distance 131 and the surface wind speed is 4.5 α logV1, wherein α is not less than 20 and not more than 30, and the proper coil distance 131 is selected according to the difference of the surface wind speeds of the first evaporator 130, so that the dew point temperature of air can be reduced to the maximum extent, and the dehumidification effect is ensured to be the best.
The surface temperature of the first evaporator 130 is higher than that of the second evaporator 150, the surface temperature of the first condenser 140 is lower than that of the second condenser 160, and the surface wind speed of the first evaporator 130 is higher than that of the second evaporator 150. The surface temperature of the first evaporator 130 is the same as the dew point temperature of the outside air, the surface temperature of the second evaporator 150 is the same as the dew point temperature of the mixed air after mixing and first heating, the dew point temperature of the mixed air is reduced, so the surface temperature of the second evaporator 150 is lower, the water vapor is conveniently and fully condensed into water drops, the dehumidification effect is improved, the temperatures of the two evaporators are different, the cascade utilization of energy is realized, the average heat exchange temperature difference between the air and a refrigerant is reduced by cooling and dehumidifying for two times, the evaporation pressure of the evaporators is reduced, the pressure ratio of the compressor is reduced, the power consumption of the compressor is reduced, and therefore the energy efficiency of the dehumidification system 100 is improved.
The windward sides of the first air inlet 111 and the second air inlet 113 are both provided with filter screens for filtering air, and the air entering the inside of the shell 110 is filtered through the filter screens, so that the air exhausted after dehumidification is clean air, an air purification effect is achieved, and human health is facilitated.
Energy efficiency testing
The environmental parameter is that the atmospheric pressure is P00.101MPa, and the specific heat capacity of air is C0=0.865m3/kgThe air is dried and then the air is dried,ambient temperature of Td0/TS026.7 ℃/19.4 ℃ (standard working condition), the moisture content of the air is S0=11.096g/KgDry airRelative humidity d of air050.68 percent, air enthalpy value H055.267kJ/kg, dew point temperature: t is t015.648 deg.C, the first air inlet 111 has air speed V0The wind speed of the second wind inlet 113 is 1.5m/s, and is 0.9 m/s.
The relevant parameters of the first evaporator 130 are, depending on the coil spacing 131L-4.5 α logV1, when V is0At 1.5m/s, the optimum refrigeration pitch L is 4.5 α logV1 is 4.5 α 25 0.176 is 19.8mm, and the surface temperature t of the first evaporator 130 isz1=The air parameters after cooling are as follows by enthalpy difference experiment test at 16 ℃: atmospheric pressure of Pz10.101MPa, air specific volume Cz1=0.865m3/kgDry airAt an ambient temperature of Td z1/TS z120 deg.C/11.789 deg.C, moisture content of air Sz1=4.337g/KgDry airRelative humidity dz130% of air enthalpy value Hz131.084 kJ/kg; actually measured air volume Lz1=120m3/h。
The relevant parameter of the first condenser 140 is that the surface temperature is Tn155 ℃, the air parameters are: atmospheric pressure of Pn1=0.101MPa, specific volume of air Cn1=0.865m3/kgThe air is dried and then the air is dried,ambient temperature of Td n1/TS n1Moisture content S at 28 ℃/17.464 ℃n1=8.232g/KgDry airRelative humidity dn135% air enthalpy value Hn149.295kJ/kg, dew point temperature tn111.135 deg.C; actually measured air volume Ln1=144m3/h。
The relevant parameter of the second evaporator 150 is the surface temperature t of the first evaporator 130z2=The air state after cooling at 11 ℃ is as follows: atmospheric pressure of Pz20.101MPa, air specific volume Cz2=0.865m3/kgThe air is dried and then the air is dried,ambient temperature of Td z2/TS z2Moisture content S at 18 ℃/6.381 ℃z2=1.27g/KgDry airRelative humidity dz210% of air enthalpy value Hz221.389kJ/kg, dew point temperature tz211.135 deg.C; measured wind speed Vz2=0.9m/s.
The second condenser 160 has a relevant parameter that the surface temperature of the second condenser 160 is Tn265 ℃, the air parameters are: atmospheric pressure of Pn20.101MPa, air specific volume Cn2=0.865m3/kgThe air is dried and then the air is dried,ambient temperature of Td n2/TS n230 ℃/13.135 ℃ moisture content Sn2=2.617g/KgDry airRelative humidity dn210% of air enthalpy value Hn236.99kJ/kg, dew point temperature tn2At-4.904 deg.C, actually measured air quantity Ln2=130m3/h。
The cooling capacity of the first evaporator 130 is
Dz1=Cz1*(S0-Sz1)*Lz1=0.865*(11.096-4.337)*120=701.5g/h
The first evaporator 130 has an evaporation load of
Wz1=Cz1*(H0-Hz1)*Lz1=0.865*(55.267-31.084)*120=2510W/h
The first condenser 140 has a condensing duty of
Wn1=Cn1*(Hn1-Hz1)*Ln1=(48.29-31.084)*0.865*144=2143.18W/h
The cooling capacity of the second evaporator 150 is
Dz2=Cz2*(Sn1-Sz1)*Ln1=0.865*(8.232-1.27)*144=867.19g/h
The second evaporator 150 has an evaporation load of
Wz2=Cz2*(Hn1-Hz2)*Ln1=0.865*(49.295-21.389)*144=3475.97W/h
The second condenser 160 has a condensing duty of
Wn2=Cn2*(Hn2-Hz2)*L3=0.865*(36.99-21.389)*130=1754.33W/h
The total heat load is
WGeneral assembly=Wz1+Wz2-Wn1-Wn2=2088.47W/h
The total refrigerating capacity, i.e. the dehumidifying capacity, being
DGeneral assembly=Dz1+Dz2=701.5+867.19=1568.68g/h
Because the energy efficiency of the compressor of the dehumidifier in the prior art is generally about 3.2, the estimated input power of the compressor is
P=WGeneral assembly/EER=2088.47/3.2=652.6W
The dehumidification energy efficiency of the invention when the compressor with the input power is adopted
EER=DGeneral assembly/P=1568.68g/h/652.6W=2.4。
And (4) analyzing results:
under the condition that the input power of the compressor is the same, the energy efficiency value 2.4 of the invention is higher than the energy efficiency requirement of the American energy Star 1.85, which shows that the invention can effectively improve the dehumidification energy efficiency, reduce the loss, is beneficial to energy conservation and environmental protection, and the dehumidification capacity of the invention is DGeneral assembly=Dz1+Dz2The humidity removal capacity is high when the humidity removal capacity is 701.5+ 867.19-1568.68 g/h.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (1)
1. High-efficient dehumidification system, its characterized in that: the air conditioner comprises a shell, a first air inlet, a first evaporator, a first condenser, a second evaporator, a second condenser, an air supply mechanism, an air outlet and a water receiving disc, wherein the first air inlet is formed in one side of the shell and used for allowing outside air to enter, the first evaporator is sequentially arranged in the shell and used for liquefying water vapor in the air for the first time, the first condenser is used for heating the air for the first time, the second evaporator is used for liquefying the water vapor in the air for the second time, the second condenser is used for heating the air for the second time, the air supply mechanism is used for guiding the air, the air outlet is formed in one side, close to the air supply mechanism, of the shell and used for discharging dehumidified air, and the water receiving disc is connected to the first evaporator and the second evaporator; the surface temperature of the first evaporator is equal to the dew point temperature of the outside air; the shell is provided with a second air inlet which is communicated with a gap between the first evaporator and the first condenser; the windward sides of the first air inlet and the second air inlet are respectively provided with a filter screen for filtering air; the first evaporator is a coil evaporator; the distance between the coils of the first evaporator is adjustable, the distance between the coils of the first evaporator is L, the surface wind speed of the first evaporator is V1, and the relationship between the distance between the coils and the surface wind speed is 4.5 alpha logV1, wherein alpha is more than or equal to 20 and less than or equal to 30.
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