Investigation on Drying Performance and Energy Savings of the Batch-Type Heat Pump Dryer

Lee, Kong Hoon; Kim, Ook Joong

doi:10.1080/07373930802715708

Cited by 50 publications

(16 citation statements)

References 5 publications

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“…HPs have been used mainly for space heating and water heating=cooling purposes, but many studies have progressed in its industrial applications, especially in dehumidification and in drying agricultural products, which are energy-intensive processes. [37][38][39] The results of the present study show a good agreement with the literature [40,42] and highlight that HP systems are energy efficient and can be integrated to energy-intensive processes. 19.294 input to the HP dryer.…”

Section: Resultssupporting

confidence: 79%

Exergoeconomic Analysis of Plum Drying in a Heat Pump Conveyor Dryer

et al. 2010

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In this study, plum slices were dried in a heat pump dryer designed and constructed in Ege University, Izmir, Turkey. Drying experiments were carried out at an air temperature range of [45][46][47][48][49][50][51][52][53][54][55] C. The performance of the dryer along with its main components were evaluated using an exergy analysis method. Exergy destruction and capital cost rates were used for the exergoeconomic analysis, which is based on the quantities exergy, cost, energy, and mass (EXCEM) method. Exergy destruction rates to capital cost values R ex were obtained to vary between 1.668 and 2.063 W/ USD at different drying air temperatures. R en values were observed to range from 6.258 to 5.749 W/USD. R en values decreased as the drying air temperature increased, contrary to R ex values. _ R R ex and _ R R en values increased linearly with increasing temperature due to the loss, whereas _ R R en decreased due to the relatively higher energy utilization efficiency of the heat pump. In the compressor, _ R R en and _ R R ex values decreased with the increase in the temperature contrary to the other components. _ R R ex had the lowest value in the drying duct. However, in the compressor, expansion valve, and heat recovery, _ R R ex values were found to be higher and should be improved in these units.

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Section: Resultssupporting

confidence: 79%

Exergoeconomic Analysis of Plum Drying in a Heat Pump Conveyor Dryer

et al. 2010

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“…The developed experimental vacuum-atmospheric dryer includes the following units [2]: unit of vacuum drying, in which the process of vacuum dehydration from initial moisture content of the material to intermediate one is conducted; unit of atmospheric drying -for drying the material from intermediate humidity to the final one; heat pump [3][4][5] unit on the basis of a single-stage refrigeration machine designed for heating and cooling the elements of drying plant and reduce the load on a vacuum pump.…”

Section: Experimental Methodsmentioning

confidence: 99%

Results of Vacuum-Atmospheric Drying of Large-Dispersed Food Materials

Abdizhapparova¹,

Khanzharov²,

Ospanov³

et al. 2019

OF THE ACADEMY OF SCIENCES OF THE REPUBLIC OF KAZAKHSTAN

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“…Many researchers have worked on the use of heat pump dryer to improve the drying quality [7,8]. Studies carried out on different types of heat pump dryers are as follows: heat pump dryer that uses carbon dioxide as a working fluid [9], two-stage heat pump dryer [10], solar-assisted heat pump dryer [11], convectional dryer [12], hot air thin-layer dryer [13], HP dryers [14][15][16][17][18], and PID (proportional-integral-derivation)-controlled solar heat pump dryer [19].…”

Section: Introductionmentioning

confidence: 99%

Testing of a Condensation-type Heat Pump System for Low-temperature Drying Applications

Aktaş

Ceylan

Gürel

2014

International Journal of Food Engineering

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A closed-type water source heat pump dryer integrated with a drying programme (DP) was designed and tested. The DP was developed using psychometric conditions of desired drying air and thermodynamic balance of heat pump. A drying algorithm was developed according to the technical specification of the dryer. Drying air temperature, relative humidity and drying air volumetric flow rate were entered from a programmable logic controller (PLC) screen. In this study, the drying of mint leaves was examined. Mint leaves were dried at different temperatures (35°C, 40°C and 45°C) and at different volumetric flow rates 300 m 3 /h for a velocity of 0.75 m/s and 600 m 3 /h for a velocity of 1.5 m/s in the PLC-controlled heat pump dryer. The relative humidity of the drying air entering the dryer chamber was kept between 13.88% and 6.81% and the two air dampers were controlled according to predetermined value. The coefficient of performance (COP hp ) values obtained were between 3.81 and 2.29. The specific moisture extraction rate for the whole system (SMER ws ) was between the 0.034 and 0.044 kg/kWh. The drying air temperatures were controlled with an accuracy of AE 0.41°C to AE 0.76°C depending on the mode of operation.

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Investigation on Drying Performance and Energy Savings of the Batch-Type Heat Pump Dryer

Cited by 50 publications

References 5 publications

Exergoeconomic Analysis of Plum Drying in a Heat Pump Conveyor Dryer

Exergoeconomic Analysis of Plum Drying in a Heat Pump Conveyor Dryer

Results of Vacuum-Atmospheric Drying of Large-Dispersed Food Materials

Testing of a Condensation-type Heat Pump System for Low-temperature Drying Applications

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