PDF Publication Title:
Text from PDF Page: 006
The last system setup that is evaluated in the next section features the implementation of a moist air bypass within the closed-loop cycle. A direct recirculation of 20 % and 50 % of the overall moist air volume flow will be examined. The percentage of recirculation is adjusted by choosing appropriate pressure drop values for the tubes in the bypass and evaporator circuit. By reducing the volume flow in both the evaporator and gas cooler, less energy consumption is expected due to a reduced compressor load. Any of the previously introduced systems could be equipped with a bypass on the air side. A simplified scheme of the system layout is illustrated in figure 5 (right), for reasons of clarity with a cut-off heat pump. 2.4 Simulation results and outlook Three different system setups for a heat pump assisted dryer are investigated regarding their quantity of energy savings in comparison towards an open-loop benchmark setup. The heat pump system with two parallel evaporators (figure 5 (left)) will in the following be referred to as "No Bypass". Furthermore, this system will be upgraded with a bypass, which enables a 20 % and 50 % direct recirculation of the overall moist air flow. Therefore, four system designs are compared in figures 6- 8. The investigated systems are based on a dryer capacity which provides the removal of up to 7 kg water per hour at the considered drying conditions. The inlet temperature for the drying chamber has been controlled to 50 °C for all four systems. For the open-loop system, the moist air is just being released to the environment. For the three heat pump-assisted systems, the moist air is cooled down in the evaporator to 30 – 35 °C, depending on the amount of bypassed air, as seen in figure 6 (left): Figure 6: Simulation results for four investigated systems, dryer outlet temperature (left) and product mass (right) Figure 7: Simulation results for four investigated systems, relative humidity for the dryer inlet (left) and outlet (right)PDF Image | Design of a CO2 heat pump drier with dynamic modelling tools
PDF Search Title:
Design of a CO2 heat pump drier with dynamic modelling toolsOriginal File Name Searched:
ICR2019_ID1333_HPD_Bantle_PrePrint.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)