By Vasile Minea
Drying of solids is likely one of the most typical, advanced, and energy-intensive business tactics. traditional dryers supply constrained possibilities to extend power potency. warmth pump dryers are extra strength and price powerful, as they could recycle drying thermal power and decrease CO2, particulate, and VOC emissions because of drying. This booklet presents an creation to the know-how and present top practices and goals to extend the profitable commercial implementation of warmth pump- assisted dryers. It allows the reader to have interaction hopefully with the expertise and gives a wealth of knowledge on theories, present practices, and destiny instructions of the expertise. It emphasizes a number of new layout innovations and working and keep an eye on innovations, that are utilized to enhance the industrial and environmental potency of the drying procedure. It solutions questions about dangers, merits vs. negative aspects, and impediments and provides suggestions to present problems.
Discusses warmth pump know-how mostly and its current and destiny challenges.
Describes fascinating and promising concepts in drying nutrients, agricultural, and wooden items with quite a few warmth pump technologies.
Treats a number of technical elements, from modeling and simulation of drying tactics to business applications.
Emphasizes new layout recommendations and working and keep an eye on techniques to enhance the potency of the drying process.
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Extra info for Advances in Heat Pump-Assisted Drying Technology
Backup heating coils may supplement the heat that the drying air absorbed from the condenser. The dryer fan circulates the air through the stack of dried product and its rotation direction periodically changes during the dehumidification process. 10 (a) Heat pump dryer with compact-type heat pump; (b) heat pump dryer with split-type heat pump; (c) air thermodynamic cycle in a North American-type Mollier diagram; and (d) refrigerant thermodynamic cycle in p–h diagram. C, compressor; CD, condenser; HR, air-cooled heat rejection heat exchanger; LR, , drying airflow rate; CD, condenser.
Sizing the heat pump’s nominal capacity for drying purposes implies a good comprehension of the typical material drying curve, that is, the profile of MC variation during the entire drying cycle. Over- or undersized heat pumps may drastically penalize both the energy and drying performance of heat pump-assisted dryers. To achieve as high as possible COPheat pump and SMER heat pump , the dried material must give off enough moisture to be able to provide sufficiently high absolute humidity to the drying air at the heat pump evaporator inlet.
If all or even a part of such design and control requirements are not met in practice, frequent compressor cycling can occur, as for example, when the thermal dewatering rate of the dried product and the heat pump dehumidification capacity, are unbalanced (Minea 2010a, b) for more details. Sizing the heat pump’s nominal capacity for drying purposes implies a good comprehension of the typical material drying curve, that is, the profile of MC variation during the entire drying cycle. Over- or undersized heat pumps may drastically penalize both the energy and drying performance of heat pump-assisted dryers.