TY - JOUR
TI - Energy and exergy efficiency of heat pipe evacuated tube solar collectors
AU - Jafarkazemi Farzad
AU - Ahmadifard Emad
AU - Abdi Hossein
JN - Thermal Science
PY - 2016
VL - 20
IS - 1
SP - 327
EP - 335
PT - Article
AB - In this paper, a heat pipe evacuated tube solar collector has been  investigated both theoretically and experimentally. A detailed theoretical  method for energy and exergy analysis of the collector is provided. The  method is also evaluated by experiments. The results showed a good agreement  between the experiment and theory. Using the theoretical model, the effect  of different parameters on the collector’s energy and exergy efficiency has  been investigated. It is concluded that inlet water temperature, inlet water  mass flow rate, the transmittance of tubes and absorptance of the absorber  surface have a direct effect on the energy and exergy efficiency of the heat  pipe evacuated tube solar collector. Increasing water inlet temperature in  heat pipe evacuated solar collectors leads to a decrease in heat transfer  rate between the heat pipe’s condenser and water.