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Split Wood Heat Pump Dryer

Product Description

Model: 070S-U-Z /140S-U-Z / 200S-U-Z

Power: 7P/14P/20P

Type:Special for wood, low temperature type with circulating air supply

Name: Heat pump dryer special for wood

Structure: Split type

Machine features:drying operation cost is low, and the whole process of automatic humidification and drying is completed with one button. The dried product has a short drying cycle, high yield, and there is no pollution during the drying process.

Application field: it is suitable for drying all kinds of wood products, such as furniture wood, wood intelligent drying, wood veneer drying, wood secondary drying, etc. The normal temperature type is suitable for drying in the environment above 0°C;

The woods which are generally be dried include red pine, white pine, birch, paulownia, beech, maple, camphor, willow, basswood, elm, oak, ash, rosewood, red sandalwood

Machine components

1.Indoor unit: it controls the start and stop bottom of the drying room, and controls the temperature, humidity and dehumidification time of the drying room

2.Outdoor unit: it absorbs the heat of outdoor air and make it become isothermal and pressure gas to circulate again

3、Heat recovery machine:it exchanges the energy between the fresh air entering the room and the dirty air which need to be exhausted from the room, which means it can exhaust the dirty air while leaving energy.

4、Drying room:it provides heat preservation for materials in the drying room.

5、Circulating fan: it allows the hot air to drying the material evenly according to the air path we set.

6、Electricity control box: it has automatic control system to control the normal operation of the machine, meanhwile, it also installed protection device for preventing short-circuit and overheat.

Brief introduction of wood drying process

The basic content and purpose of heat and moisture treatment: The heat and moisture treatment in the wood drying process includes low-temperature preheating, initial treatment, intermediate treatment, balance treatment and final treatment of wood.

Low temperature treatment

The low-temperature preheating of the dried wood is carried out before the initial treatment. There are two purposes: one is to heat up the surface of the shell and the surface of the main equipment parts in the drying chamber, so as to avoid condensed ice generated by subsequent high temperature and high humidity; another purpose is to allow the wood gradually adapt its environmental conditions in the drying room. At the time when the surface of the wood is heated, the temperature difference alongside the thickness direction of the wood should be reduced for the purpose of offering convenience for initial treatment.

Initial treatment

The initial treatment of the dried wood is carried out after low-temperature preheating and before the wood is prepared for drying. One of the purposes is to heat up the wood alongside the thickness direction, that is making a convergence between the surface temperature of the wood and the temperature of the core layer, so that the wood can accelerate the internal moisture to move to the surface when it enters the drying stage; the second purpose is to prevent the wood from being cracked during the drying process, especially to avoid surface cracking.

Low-temperature preheating and initial treatment of wood are very important steps in the wood drying process. For semi-dry wood and air-dried wood, low-temperature preheating and initial treatment can eliminate the surface tensile stress generated by the dried wood during the air-drying process. For wet wood and raw wood, low-temperature preheating and initial treatment can evaporate part of the moisture content in the wood, so that the initial moisture content tends to be even. Low-temperature preheating and initial treatment can also reduce the fiber saturation point of wood and the viscosity of water in the wood, which relaxes the surface capillaries of semi-dry wood and air-dried wood, and improve the conductivity of water in the wood. Low-temperature preheating and initial treatment can also reduce the chance of internal cracking of the wood in the later stage of drying.

Intermediate processing

The wood will produce surface tensile stress in the early stage of the drying process, and will cause internal cracks in severe cases. The purpose of intermediate treatment is to eliminate the surface tensile stress and surface hardening. It means that through high temperature and high humidity treatment, the surface of the wood is fully moisturized, and the drying stress and the surface hardening is eliminated to avoid wood cracking. Meanwhile, it can prevent internal fissures and can relax the surface capillary and slow down the water content gradient at the same time, so as to facilitate the continued drying. After intermediate treatment, the drying speed will be significantly accelerated within a certain period of time, and the wood will not be damaged.

Balancing treatment

If the dried wood has the following conditions, the wood must be balanced in the later stage of drying:

(1) If the initial moisture content of the wood before drying is very different, for example, the difference is more than 20%-30%.

(2) When the moisture content of the wood has reached the required final moisture content value through the inspection of the inspection board, there may still have a part of the wood that has not fully reached the required moisture content, and the actual moisture content of the dried wood at the time is very different. .

(3) When the sweat rate of the dried wood has reached the required final moisture content value through the inspection of the inspection board, some of the moisture content alongside its thickness may still distributed unevenly, and when the moisture content of the inner layer is still high .

(4) When the requirement for the uniformity of the final moisture content of the dried wood is relatively high, after balance treatment, the woods whose final moisture content requirement has already meet shall not be dried, whereas the woods that has not reached the final moisture content requirement shall continue to drying in order to improve the drying uniformity of the final moisture content of the entire wood and the uniformity of the distribution of moisture content along the thickness.

Final treatment

After the dried wood reaches the required moisture content and undergoes a balance treatment, no matter whether the moisture content distribution along the thickness direction is uniform or not, there will be varying degrees of residual stress inside it. In order to eliminate the residual stress and make the moisture content distribution along the thickness of the wood more uniform, it is necessary to perform necessary heat and moisture treatment on the dried wood. This treatment is called the final treatment of the dried wood. For wood production, the wood materials that require the drying quality achieve Grade I, Grade II, or Grade III shall be subjected to the final humidity adjustment treatment.

Regular Reference for wood ratio table

Regular Reference for wood ratio table
Loading amount(m³)50~8080~110110~150
Heat pump mainframe(set)14P×214P×314P×4
 mainframe capacity(kw)90135180
Total power of heat pump mainframe(kw)284256
Fan sizeHigh temperature and high humidity fan(2.2kw)
Number of fans358
Total fan power(kw)6.61117.6
Auxiliary electric heating power(kw)243648
Heat recovery machine (set)234
Total heat recovery power(kw)11.52
Installed capacity(kw)6091125
Electric control box (set)1

Parameter for split wood heat pump dryer

Application rangedrying typeLow-temperature circulating air type
Operating temperature range-10~43℃
Drying temperature range30~75℃
Outdoor unit ModelAHRW070S-U-Z140S-U-Z200S-U-Z
Nominal heating outputkW22.043.062.0
Nominal input powerkW6.51319.8
Operation currentA11.222.433.7
Power supplyV/ph/Hz380/3/50
Compressor type/High temperature,  enthalpy increased, and fully enclosed vortex type
Drying room temperature control precision±1
Compressor quantityset123
dimensions of liquid pipe, gas pipeinch½,¾½x2, ¾x2½x2, ¾x4
Refrigerant/R134a
Overall dimensions(L/W/H)mm720x720x10001420x720x10701620x920x1070
Net weight/gross weightkg140235355
Indoor unitModelAHRG070S-DM070S-DMx2100S-DMx2
Dimensions of liquid pipe, gas pipeinch½, ¾½x2, ¾x2½x2, ¾x4
Total fan powerkW0.752.22.2
Rated air volumem³/h75001500015000
Air static pressurePa80120120
Electric heating powerkW66X212×2
Overall Dimensions(LxWxH)mm1265x450x95012655x450x950x21800x450x950
Net Weightkg4545×280×2
Heat recovery machineModelABR200S
Total fan powerkW0.5
Rated air volumem³/h2000
Moisture capacitykg/h40
Overall Dimensions(LxWxH)mm1022x978x481
Net Weightkg63

1.Heating system——high efficiency and energy saving, intelligent temperature control

2.Humidification system——precise temperature control, atomized and humidification

3.Dehumidification system——efficient dehumidification, recovering 60% of energy loss

4.Control system——central computer control, convenient and worry-free

5.Circulating air system——it could forward and reverse with three-dimensional circulation and could realize all-round drying

6.Environmental protection——no pollution and zero emissions, in line with national environmental protection standards

7.Durable-using——it adopts anti-corrosion material and has long service life

High quality——intelligent control, high quality, massive yield of dried products

8.Simple——simple installation, no special equipment verification

9.Energy saving——the energy efficiency could up to 350%, which could save lots of costs

10.Intelligent——prefabricated curve, allowing you to easily handle wood drying

1.Heating system——high efficiency and energy saving, intelligent temperature control

2.Humidification system——precise temperature control, atomized and humidification

3.Dehumidification system——efficient dehumidification, recovering 60% of energy loss

4.Control system——central computer control, convenient and worry-free

5.Circulating air system——it could forward and reverse with three-dimensional circulation and could realize all-round drying

6.Environmental protection——no pollution and zero emissions, in line with national environmental protection standards

7.Durable-using——it adopts anti-corrosion material and has long service life

High quality——intelligent control, high quality, massive yield of dried products

8.Simple——simple installation, no special equipment verification

9.Energy saving——the energy efficiency could up to 350%, which could save lots of costs

10.Intelligent——prefabricated curve, allowing you to easily handle wood drying

Regular Reference for wood ratio table

Regular Reference for wood ratio table
Loading amount(m³)50~8080~110110~150
Heat pump mainframe(set)14P×214P×314P×4
 mainframe capacity(kw)90135180
Total power of heat pump mainframe(kw)284256
Fan sizeHigh temperature and high humidity fan(2.2kw)
Number of fans358
Total fan power(kw)6.61117.6
Auxiliary electric heating power(kw)243648
Heat recovery machine (set)234
Total heat recovery power(kw)11.52
Installed capacity(kw)6091125
Electric control box (set)1

Parameter for split wood heat pump dryer

Application rangedrying typeLow-temperature circulating air type
Operating temperature range-10~43℃
Drying temperature range30~75℃
Outdoor unit ModelAHRW070S-U-Z140S-U-Z200S-U-Z
Nominal heating outputkW22.043.062.0
Nominal input powerkW6.51319.8
Operation currentA11.222.433.7
Power supplyV/ph/Hz380/3/50
Compressor type/High temperature,  enthalpy increased, and fully enclosed vortex type
Drying room temperature control precision±1
Compressor quantityset123
dimensions of liquid pipe, gas pipeinch½,¾½x2, ¾x2½x2, ¾x4
Refrigerant/R134a
Overall dimensions(L/W/H)mm720x720x10001420x720x10701620x920x1070
Net weight/gross weightkg140235355
Indoor unitModelAHRG070S-DM070S-DMx2100S-DMx2
Dimensions of liquid pipe, gas pipeinch½, ¾½x2, ¾x2½x2, ¾x4
Total fan powerkW0.752.22.2
Rated air volumem³/h75001500015000
Air static pressurePa80120120
Electric heating powerkW66X212×2
Overall Dimensions(LxWxH)mm1265x450x95012655x450x950x21800x450x950
Net Weightkg4545×280×2
Heat recovery machineModelABR200S
Total fan powerkW0.5
Rated air volumem³/h2000
Moisture capacitykg/h40
Overall Dimensions(LxWxH)mm1022x978x481
Net Weightkg63

*1. Nominal working condition: outdoor side: dry bulb temperature 20℃, wet bulb temperature 15℃;  Indoor side: dry bulb temperature: 70℃, wet bulb temperature:

*2. The moisture discharge capacity is calibrated under standard test conditions and will be different due to indoor and outdoor wet bulb temperature changes.

*3. Models, parameters and performance may change due to product improvement without prior notice. Specific parameters shall be subject to the nameplate of the product.

Machine components

1.Indoor unit: it controls the start and stop bottom of the drying room, and controls the temperature, humidity and dehumidification time of the drying room

2.Outdoor unit: it absorbs the heat of outdoor air and make it become isothermal and pressure gas to circulate again

3、Heat recovery machine:it exchanges the energy between the fresh air entering the room and the dirty air which need to be exhausted from the room, which means it can exhaust the dirty air while leaving energy.

4、Drying room:it provides heat preservation for materials in the drying room.

5、Circulating fan: it allows the hot air to drying the material evenly according to the air path we set.

6、Electricity control box: it has automatic control system to control the normal operation of the machine, meanhwile, it also installed protection device for preventing short-circuit and overheat.

Brief introduction of wood drying process

The basic content and purpose of heat and moisture treatment: The heat and moisture treatment in the wood drying process includes low-temperature preheating, initial treatment, intermediate treatment, balance treatment and final treatment of wood.

Low temperature treatment

The low-temperature preheating of the dried wood is carried out before the initial treatment. There are two purposes: one is to heat up the surface of the shell and the surface of the main equipment parts in the drying chamber, so as to avoid condensed ice generated by subsequent high temperature and high humidity; another purpose is to allow the wood gradually adapt its environmental conditions in the drying room. At the time when the surface of the wood is heated, the temperature difference alongside the thickness direction of the wood should be reduced for the purpose of offering convenience for initial treatment.

Initial treatment

The initial treatment of the dried wood is carried out after low-temperature preheating and before the wood is prepared for drying. One of the purposes is to heat up the wood alongside the thickness direction, that is making a convergence between the surface temperature of the wood and the temperature of the core layer, so that the wood can accelerate the internal moisture to move to the surface when it enters the drying stage; the second purpose is to prevent the wood from being cracked during the drying process, especially to avoid surface cracking.

Low-temperature preheating and initial treatment of wood are very important steps in the wood drying process. For semi-dry wood and air-dried wood, low-temperature preheating and initial treatment can eliminate the surface tensile stress generated by the dried wood during the air-drying process. For wet wood and raw wood, low-temperature preheating and initial treatment can evaporate part of the moisture content in the wood, so that the initial moisture content tends to be even. Low-temperature preheating and initial treatment can also reduce the fiber saturation point of wood and the viscosity of water in the wood, which relaxes the surface capillaries of semi-dry wood and air-dried wood, and improve the conductivity of water in the wood. Low-temperature preheating and initial treatment can also reduce the chance of internal cracking of the wood in the later stage of drying.

Intermediate processing

The wood will produce surface tensile stress in the early stage of the drying process, and will cause internal cracks in severe cases. The purpose of intermediate treatment is to eliminate the surface tensile stress and surface hardening. It means that through high temperature and high humidity treatment, the surface of the wood is fully moisturized, and the drying stress and the surface hardening is eliminated to avoid wood cracking. Meanwhile, it can prevent internal fissures and can relax the surface capillary and slow down the water content gradient at the same time, so as to facilitate the continued drying. After intermediate treatment, the drying speed will be significantly accelerated within a certain period of time, and the wood will not be damaged.

Balancing treatment

If the dried wood has the following conditions, the wood must be balanced in the later stage of drying:

(1) If the initial moisture content of the wood before drying is very different, for example, the difference is more than 20%-30%.

(2) When the moisture content of the wood has reached the required final moisture content value through the inspection of the inspection board, there may still have a part of the wood that has not fully reached the required moisture content, and the actual moisture content of the dried wood at the time is very different. .

(3) When the sweat rate of the dried wood has reached the required final moisture content value through the inspection of the inspection board, some of the moisture content alongside its thickness may still distributed unevenly, and when the moisture content of the inner layer is still high .

(4) When the requirement for the uniformity of the final moisture content of the dried wood is relatively high, after balance treatment, the woods whose final moisture content requirement has already meet shall not be dried, whereas the woods that has not reached the final moisture content requirement shall continue to drying in order to improve the drying uniformity of the final moisture content of the entire wood and the uniformity of the distribution of moisture content along the thickness.

Final treatment

After the dried wood reaches the required moisture content and undergoes a balance treatment, no matter whether the moisture content distribution along the thickness direction is uniform or not, there will be varying degrees of residual stress inside it. In order to eliminate the residual stress and make the moisture content distribution along the thickness of the wood more uniform, it is necessary to perform necessary heat and moisture treatment on the dried wood. This treatment is called the final treatment of the dried wood. For wood production, the wood materials that require the drying quality achieve Grade I, Grade II, or Grade III shall be subjected to the final humidity adjustment treatment.

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