By Vasile Minea
Drying of solids is likely one of the most typical, advanced, and energy-intensive commercial procedures. traditional dryers supply constrained possibilities to extend strength potency. warmth pump dryers are extra power and price potent, as they could recycle drying thermal strength and decrease CO2, particulate, and VOC emissions because of drying. This ebook presents an advent to the expertise and present top practices and goals to extend the profitable business implementation of warmth pump- assisted dryers. It permits the reader to have interaction expectantly with the expertise and gives a wealth of knowledge on theories, present practices, and destiny instructions of the expertise. It emphasizes numerous new layout techniques and working and keep watch over suggestions, which are utilized to enhance the commercial and environmental potency of the drying strategy. It solutions questions on dangers, benefits vs. dangers, and impediments and provides strategies to present problems.
Discusses warmth pump know-how more often than not and its current and destiny challenges.
Describes attention-grabbing and promising options in drying nutrients, agricultural, and wooden items with numerous warmth pump technologies.
Treats numerous technical points, from modeling and simulation of drying strategies to business applications.
Emphasizes new layout options and working and regulate concepts to enhance the potency of the drying process.
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Drying of solids is without doubt one of the commonest, complicated, and energy-intensive business techniques. traditional dryers supply constrained possibilities to extend strength potency. warmth pump dryers are extra power and value potent, as they could recycle drying thermal power and decrease CO2, particulate, and VOC emissions as a result of drying.
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Additional 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.
1998; Mujumdar and Wu 2008). However, several of proposed technological improvements were rather complex dryer-heat pump integrated concepts leading to higher initial costs and more sophisticated control strategies (see Minea 2014a for more details). This section highlights some simple integrated drying concepts, as well as a number of design and operation improvements. 10, a heat pump-assisted dryer can operate in both batch and continuous (tray) (Jolly et al. 1990). 10b) heat pumps. That is because batch drying systems allow partial recirculation of drying air with very low leakage rates, thus achieving higher thermal efficiencies (Perera and Rahman 1997).
9 years), but the energy cost savings were estimated at 29% and the reduction of CO2 emissions, at between 40% and 60%. In addition, the system provided better temperature and humidity interior conditions, higher CO2 concentrations inside the greenhouses, higher crop production (about 17% of annual increase) and quality, and reduced by 80% pesticide use (IEA 2015b). 7). In conventional systems, the cutting water is cooled by a chiller up to 20°C, while the washing liquid is heated by electric or hot steam boilers to around 60°C.