Experimental Assessment of the Thermal Performance of a Heat Pump Dryer System Based on the Variations in Compressor Discharge Pressure on Oregano Drying
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Setup
2.2. Experimental Design
2.3. Model Development
- Heating capacity
- Refrigerant mass flow rate
- Drying and energy parameter
3. Results and Discussion
3.1. Subsection Impact of Variation in Compressor Pressure Discharge on Oregano Drying Characteristics
3.2. Efficiency of Oregano Drying Process in HPDs
3.3. Analysis of Variance for the HPDS Drying Process
3.4. Behavior of Superheating with the Variation of the Compressor Discharge Pressure
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Component | Type | Technical Specifications | |
---|---|---|---|
1 | Compressor | Alternative hermetic piston, Embraco FFU 100HAK model | 248.56 W, 115–127 V, 5 A, 60 Hz |
2 | Evaporator | Finned cross-flow heat exchanger | 8 fin/in |
3 | Compressor Air Blower | SunFlow centrifugal fan, 172*150*50 mm HBL model | 0.37 kW, 2.1 m3/h |
4 | Temperature display and registration unit | Electronic interface made with Arduino | 5 V, 1.5 A |
5 | High and low pressure sensor | Bourdon manometer | 0–3447.3 kPa; 0–827 kPa |
6 | Pipeline for air recirculation | Thermal isolated pipe | 4″ = 0.10 m, aluminum, fiber glass as isolating system |
7 | Tray 1 | Grill | 34 cm × 34.5 cm |
8 | Tray 2 | Grill | 34 cm × 34.5 cm |
9 | Baffle | Aluminum deflector | degree tilt 45° |
10 | Condenser | Finned cross-flow heat exchanger | 8 fin/in |
Instruments | Properties | Range | Accuracy | Uncertainty |
---|---|---|---|---|
Temperature and humidity sensor | Power supply 3–5.5 VDC | −40–80 °C | ||
0–99.9% RH | ||||
Low Pressure | Mechanical manifold gauge | 0–11884.49 kPa | N/A | |
High pressure | Mechanical manifold gauge | 0–23768.3 kPa | N/A | |
Velocity | Multifunction vane thermo-anemometer | 0.6–32 m/s | 0.1 m/s | |
Digital balance | BOECO-3000 g | 0–3000 g | ||
Thermographic Camera | FLIR E4 | −20–250 °C | 0.15 °C | |
Superheating and subcooling calculator | 24 preprogrammed refrigerants and a Type K thermocouple | −40–200 °C | ||
Voltage and current measurement device | Digital clamp multimeter, UT207A | 0–600 VAC | N/A | |
0–66 A | ||||
Thermogravimetric Analyzer | Thermogravimetric analyzer Q6000 SDT | 19 samples with sample weights of up to 5 g | 0.02% | 0.0001 g |
Data acquisition system | Arduino-based data Acquisition system | 10 points for temperature measurement | N/A | N/A |
Parameter | Operating Range |
---|---|
Air velocity | 1.2 m/s |
Refrigerant mass flow | 0.0031 kg/s |
Surrounding air temperature | 25 °C (average) |
Surrounding relative humidity | 68% (average) |
Volumetric air flow | 195 m3/h |
Atmospheric pressure | 85.2 kPa |
Pressure | |||
---|---|---|---|
1380 kPa | 1100 kPa | 827 kPa | |
Temperature | 46.3 | 39.2 | 32.9 |
46.7 | 39.9 | 34.0 | |
46.1 | 39.5 | 34.8 | |
46.3 | 39.5 | 33.9 |
Source of Variations | Sum of Squares | Degree of Freedom | Mean Squares | F-Value | p-Value | F critical Value |
---|---|---|---|---|---|---|
Between groups | 233.76 | 2 | 116.88 | 305.17 | 9.2258×10−7 | 5.14325285 |
Inside groups | 2.30 | 6 | 0.38 | |||
Total | 236.06 | 8 |
Comparison | Result | |
---|---|---|
1380 kPa vs 1100 kPa | 6.8 | >1.2364 |
1380 kPa vs 827 kPa | 12.5 | >1.2364 |
1100 kPa vs 827 kPa | 5.6 | >1.2364 |
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Salazar-Hincapié, A.; Delgado-Mejía, A.; Romero-Maya, A.F.; Duque-Grisales, E. Experimental Assessment of the Thermal Performance of a Heat Pump Dryer System Based on the Variations in Compressor Discharge Pressure on Oregano Drying. Energies 2020, 13, 6333. https://doi.org/10.3390/en13236333
Salazar-Hincapié A, Delgado-Mejía A, Romero-Maya AF, Duque-Grisales E. Experimental Assessment of the Thermal Performance of a Heat Pump Dryer System Based on the Variations in Compressor Discharge Pressure on Oregano Drying. Energies. 2020; 13(23):6333. https://doi.org/10.3390/en13236333
Chicago/Turabian StyleSalazar-Hincapié, Arley, Alvaro Delgado-Mejía, Andrés Felipe Romero-Maya, and Eduardo Duque-Grisales. 2020. "Experimental Assessment of the Thermal Performance of a Heat Pump Dryer System Based on the Variations in Compressor Discharge Pressure on Oregano Drying" Energies 13, no. 23: 6333. https://doi.org/10.3390/en13236333