In the photovoltaic and thermoelectric system, the output voltage and current of the solar panels constantly changed with solar irradiance, resulting in the thermoelectric heat pump working under off-design conditions for a long time. To test the performance stability and affordability of the thermoelectric heat pump under off-design conditions, a DC power device replacing the solar panels was used to output unstable current to drive the thermoelectric heat pump. Under three different off-design conditions including continuously working, voltage jumping and limiting voltage, the mutual relation between hot side temperature Th, cold side temperature Tc, temperature difference Td, COP, cooling (heating) capacity and operating voltage were analysed. The results showed that the thermoelectric heat pump refrigerated fast, and it could remain stable. Its heating efficiency was about 0.8 higher than cooling efficiency which indicated that the effect of heating was obviously better than cooling. With the increasing of operating voltage, the temperature difference became greater, but the COP smaller. In addition, the best operating voltage of the thermoelectric heat pump should be between 2 V and 4 V and the effect of heat dissipation had a great influence on the cooling and heating performance of the thermoelectric heat pump.
ZHANG Ling
,
LU Hao
,
LIU Zhongbing
. Analysis on Performance of the Thermoelectric Heat Pump under Off-design Conditions[J]. Science & Technology Review, 2014
, 32(3)
: 62
-66
.
DOI: 10.3981/j.issn.1000-7857.2014.03.009
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