THERMAL SCIENCE

International Scientific Journal

Nurettin Yamankaradeniz

,

K. Furkan Sokmen

,

Salih Coşkun

,

Omer Kaynakli

,

Bilsay Pastakkaya

PERFORMANCE ANALYSIS OF A RE-CIRCULATING HEAT PUMP DRYER

ABSTRACT
A re-circulating heat pump dryer (HPD) system was designed, constructed and tested at steady state and transient conditions. Refrigerant 134a was used as a refrigerant in this system. The tests were performed to observe behavior of HPD system. So, changes of temperature and relative humidity of drying air through the dryer and heat pump operating temperatures were observed during the drying process and effects of bypass air ratio (BAR) on the system’s parameters as system performance and specific moisture extracted ratio (SMER) at steady state were investigated. The HPD system was also tested to investigate temperatures and relative humidity changes of drying air during drying process on the system’s parameters depend on time. Air flow rate circulated through the HPD system was 554m3/h during the all tests. According to test results, the system’s parameters did not change up to 40% of BAR. Then the COP and SMER values were decreased after 40% of BAR. While SMER values changed between 1.2 and 1.4, COPsys changed between 2.8 and 3.3 depend on BAR. As well as during the drying process, the COP and SMER values were also affected and decreased depend on time.
KEYWORDS
drying, dryer, heat pump, bypass air ratio, heat pump assisted dryer
PAPER SUBMITTED: 2013-04-26
PAPER REVISED: 2014-05-30
PAPER ACCEPTED: 2014-06-08
PUBLISHED ONLINE: 2014-06-21
DOI REFERENCE: https://doi.org/10.2298/TSCI130426069Y
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Issue 1, PAGES [267 - 277]
REFERENCES
  1. Chua KJ, Mujumdar AS, Hawlader MNA, Chou SK, Ho JC, Batch drying of banana pieces effect of stepwise change in drying air temperature on drying kinetics and product color, Food Research International, 34 (2001), pp. 721-731.
  2. Ogura H, Yamamoto T, Otsubo Y, Ishida H, Kage H, Mujumdar AS, A control strategy for chemical heat pump dryer, Drying Technology, 23 (2005), pp. 1189-1203.
  3. Ameen A, Bari S., Investigation into the effectiveness of heat pump assisted clothes dryer for humid tropics, Energy Conversion & Management, 45 (2004), pp. 1397-1405.
  4. Adapa PK, Schoenau GJ., Re-circulating heat pump assisted continuous bed drying and energy analysis, International Journal of Energy Research, 29 (2005), pp.961-972.
  5. Bannister P, Carrington G, Chen G., Heat pump dehumidifier drying technology-status, potential and prospects, Proceedings of 7th IEA heat pump conference. Beijing, China May 19-22, (2002).
  6. Hawlader MNA, Perera CO, Tian M., Properties of modified atmosphere heat pump dried foods, Journal of Food Engineering, 74 (2006), pp.392-401.
  7. Lee KH, Kim O., Investigation on drying performance and energy savings of the batch-type heat pump dryer. Drying Technology, 27 (2009), 565 - 573.
  8. Geeraert B., Air drying by heat pumps with special reference to timber drying, in: Camatini E, Kester T Editors, Heat pumps and their contribution to energy conservation, NATO advanced study institute series E, Applied Science (1976), pp. 219-246.
  9. Minea V. Improvements of high-temperature drying heat pumps, International Journal of Energy Research, 33 (2010), 180-195.
  10. Achariyaviriya S, Soponronnarit S, Terdyothin, Mathematical model development and simulation of heat pump fruit dryer. Drying Technology, 18 (2000), pp.479-491.
  11. Oktay Z., Testing of a heat-pump assisted mechanical opener dryer. Applied Thermal Engineering, 23 (2003), pp.153-162.
  12. Chua KJ, Chou SK., A modular approach to study the performance of a two-stage heat pump system for drying. Applied Thermal Engineering, 25 (2005), pp.363-1379.
  13. Qi-Long S, Chang-Hu X, Ya Z, Zhao-Jie L, Xiang-You W, Drying characteristics of horse mackerel (Trachurusjaponicus) dried in a heat pump dehumidifier, Food Engineering, 84 (2008), pp.12-20.
  14. Teeboonma U, Tiansuwan J, Soponronnarit S., Optimization of heat pump fruit dryers, Journal of Food Engineering, 59 (2003), pp.369-377.
  15. Clement S, Jia X, Jolly P., Experimental verification of a heat pump assisted-continuous dryer simulation model, International Journal of Energy Research, 17 (1993), pp.19-28.
  16. ASHRAE Handbook Fundamental, Chapter 14, Measurement and Instruments, (2005).
  17. Moffat RJ., Describing the uncertainties in experimental results, Experimental Thermal and Fluid Science 1 (1988), pp.3-17.
  18. Jia X, Jolly P, Clements S., Heat pump assisted continuous drying part 2: Simulatıon results, International Journal of Energy Research, 14 (1990) pp.71-782.
  19. Moser F, Schnitzer H., Heat Pumps in Industry, Elsevier, Amsterdam, (1985).
  20. Jolly P, Jia X, Clements S., Heat pump assisted continuous drying part 1: Simulation model, International Journal of Energy Research, 14 (1990), pp.757-770.
  21. Tai KW, Devotta S, Watson FA, Holland FA., The potential for heat pumps in drying and dehumidification system using R114, International Journal of Energy Research, 6 (1982), pp.333-340.
  22. Prasertsan S, Saen-Saby P., Heat pump drying of agricultural materials, Drying Technology, 16 (1988), pp.235-250.
  23. Almeida MSV, Gouveia MC, Zdebsky SR, Parise JAR., Performance analysis of a heat pump assisted drying system, International Journal of Energy Research, 14 (1990), pp.397-406.
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Performance analysis of a re-circulating heat pump dryer

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