Performance of evaporator collector and air collector in a solar assisted heat pump dryer
A solar assisted heat pump dryer has been designed, fabricated and tested. This paper presents the performance of evaporator-collector and air collector, when operated under same meteorological conditions. ASHRAE standard procedure of collector testing has been followed. The absorber platce of the...
| Main Authors: | , |
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| Format: | Book Chapter |
| Language: | English |
| Published: |
IIUM Press
2011
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/20098/ http://irep.iium.edu.my/20098/ http://irep.iium.edu.my/20098/1/performance_of_evaporator_-_C35.pdf |
| Summary: | A solar assisted heat pump dryer has been designed, fabricated and tested. This paper presents the
performance of evaporator-collector and air collector, when operated under same meteorological
conditions. ASHRAE standard procedure of collector testing has been followed. The absorber platce of the
evaporator-collector is made of copper plate painted black without any glazing. At the bottom of the
absorber plate, a tube has been soldered in serpentine form. Areas of the evaporator-collector and air
collector are 1.5 m2 and 1.24 m2, respectively. The evaporator-collector of the heat pump is acting directly
as the solar collector and the temperature of refrigerant at the inlet to the evaporator-collector always
remained below the ambient temperature. Due to rejection of sensible and latent heat of air at the dehumidifier.
the temperature at the inlet to the air collector is lower than the ambient air. Hence, the
thermal efficieney of the air collector also increases due to a reduction of losses from the collector. The
efficiency of evaporator-collector and air collector varied between 0.8 - 0.86 and 0.7 - 0.75, respectively. |
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