WORKING PRINCIPLE OF HEAT PUMP DRYER

Conventionally, materials are  dried  either  in  the  field  (sun  drying)  or  using  high  temperature dryers(electric, gas fired, etc.). Successful outdoor drying depends upon  good  weather and  indeterminate weather  can  render  a product  worthless.  High  temperature  drying  can  damage  the  nutrient  content  and impart  an unpleasant  smell  to  the  dried  product. Specialty  crops  such   as  ginseng,   herbs,   echinacea,   etc., need  to be  dried at low temperatures  (30  – 45Celsius  degree)  for  product  quality  optimization.  This  is  an  important  consideration  as  they  have  a relatively  high  commercial  value.  Heating  ambient  air  to  use   for drying,  although  a simple  cost-effective  procedure,  is   of limited   application,   particularly at  higher  ambient air relative humidity’s because of the  low  allowable  maximum   temperature  conditions.  Under  high  ambient moist  air  conditions,  it  may  not  even  be  possible  to  dry   the   material   by   conventional   means.   High temperature drying deteriorates  the material structure and  can render it unsuitable for  further  use.  Low  temperature drying of specialty crops reduces the risk of loss  in nutrient  content  and  damage  to  physical properties. Drying system incorporating a dehumidification  cycle  have  been  developed  that  both  conserve energy  and  handle  the  material  gently. The  dryer  operates  using  a  heat   pump  where   both   sensible   and latent  heats  are  recovered  from  the  exhaust  air.  The heat is  then recycled back  through   the  dryer  by  heating  the  air  entering  the  dryer.  The  GEM  heat   pump  drying  system  is  a  combination  of  two   sub- systems: a heat pump and a dryer, also the equipment have 2 times waste heat recovery.

GEM heat pump  dryer  operates  according  to  a basic  air  conditioning  cycle  involving  four  main components: the evaporator, the compressor, the condenser and the expansion valve. The working fluid (refrigerant) at low pressure is vaporized in the evaporator by heat drawn from the  dryer exhaust  air.  The compressor  raises  the  enthalpy  of the  working  fluid  of  the  heat   pump  and  discharges   it  as   superheated vapor at high-pressure. Heat  is  removed  from the  working  fluid  and  returned  to  the  process  air  at  the condenser.  The  working fluid  is  then  throttled  to  the   low-pressure   line   (using   an   expansion   valve)   and  enters the evaporator to complete the cycle. In the dryer system, hot  and  dry  air  at  the  exit  of condenser  is  allowed to pass through the  drying  chamber  where  it  gains latent  heat  from  the  material.  The  humid  air  at dryer exit  then passes  through  the  evaporator  where  condensation  of  moisture  occurs  as  the  air  goes below dew point temperature. Then drain the condenser water.

HEAT PUMP DRYER APPLICATION

Drying Herbs:

Pseudo-ginseng, Aniseed, Radix Morinder Officinalls, Dendrobe,  Yam,  Glossy   Ganoderma, Honeysuckle Flower, Cassia, Ginseng, Ginger, Maca, Chinese Wolfberry, Chinese Angelica Root, Chrysanthemum Flower,Kava

Drying Agriculture Products:

Dragon Fruit Flower, Rose,  Mushroom,  Edible  Fungus,   Sweet  Potatoes,  Okra,  Tobacco  Leaf,  White  Fungus, Edible  Tree Fungus,  Red  Pepper,  Daylily,  Agrocybe  Aegerita,  Dried  Vegetables,  Bamboo   Shoot,   Cassava, Garlic, Tomato, Onion.

Drying Fruit:

Longan, Litchi,  Banana,  Mango,   Date,  Waxberry,  Plum,  Lemon,   Raisin,  Artocarpus Heterophyllus Lam,   Kiwi Fruit, Dried Persimmon, Olive, Candied Fruits, Apple, Fig, Pineapple, Strawberry, Blueberry, Grape, Coconut.

Drying Food:

Sausage, Preserved  Pork,  Smoked Fish,  Intestine  And  Casing,  Rice  Noodle,  Noodle,  Beancurd Sticks,  Corn, Grain, Nut. Seed, Seaweed.

Drying Seafood:

Sea Fish, Squid, Shrimp, Seaear, Cuttlefish, Sea Cucumber, Catfish, Anchovy Fish.

Drying Tea:

Black Tea, Red Tea, Flower Tea Etc.

Drying Incense:

Incense, Mosquito Incense, Etc.

Drying Wood:

Pine, Redwood, Redwood Furniture, Bamboo Products, Etc.

GEMTECH HEAT PUMP DRYER FEATURES

 Easy to Install

The machine and chamber are easy to install, and the overall machine needs small footprint. It can be installed indoors and outdoors.

Efficient and Eco-friendly

The machine absorbs plenty of energy of the air, only consumes a little electric energy. The power consumption is only 1/3-1/4 of the electric heating, compared with other fuels, such as coal, oil, gas etc., ii can save about 75% of operating costs. 1 KWH of electricity can achieve 4 KWH efficiency.

Safe and Reliable Operation

The whole system is operated in an absolutely safe and reliable semi-closed drying system. There are no hidden dangers of flammable, explosive, poisoning and short circuit of traditional dryers, such as other dryers that powered by fuel, gas, and electric heating.

Long Service Life and Low Maintenance Cost

The machine is developed on the basis of traditional air conditioning technology, with mature technology, stable and reliable performance and long service life.

Automation and lntelligentization

Fully automatic intelligent control system and free of labor costs. It uses self-controlled thermost and dries for 24 hours continuously.

Wide Range of Applications, Not Affected by the Climate

Widely used in food, chemical, pharmaceutical, paper, leather, wood, agricultural sideline products processing and other industries heating and drying.

Evaporator:

The use of a hydrophilic film aluminum foil does not cause oxidative detachment even after long-term use of the hydrophilic layer. This type of evaporator has a special advantage, excellent water exchange performance, can reduce wind.