Performance enhancement of an experimental air conditioning system by using TiO2/methanol nanofluid in heat pipe heat exchangers

Abstract

Specific enthalpy of desired conditioned air (at 18 °C and 55 % RH) HPHX Heat pipe heat exchanger HVAC Heating, ventilation, and air conditioninġ m Mass flow rate of air passing through the condenseṙ m min Minimum of mass flow rates between air streams in pre-cooling and reheating sections q act Actual heat transfer rate q max Maximum heat transfer rate RH Relative humidity RH e,i Relative humidity of inlet air to the HPHX evaporator S e Energy saving in evaporator section S c Energy saving in condenser section S t Total energy saving T c,i Temperature of inlet air to the HPHX condenser T C,d Temperature of desired outlet air from the AC system (at 9 °C and 100 % RH) T c,o Temperature of outlet air from the HPHX condenser T e,i Temperature of inlet air to the HPHX evaporator T e,o Temperature of outlet air from the HPHX evaporator ε Effectiveness of HPHX δ Uncertainty

Toward TiO2 Nanofluids—Part 2: Applications and Challenges

“…Based on a comprehensive consideration of the main purpose of supplying the energy required for reheating, they suggested that 2 wt.% TiO 2 –methanol nanofluid for the four-row HPHX would have been adequate and more economical.

Fig. 10Schematic of the experimental apparatus [115]. Reproduced with permission from Springer

…”

Experimental Heat Transfer Analysis on Heat Pipe using Sio2 and Tio2 Nano Fluid

“…Thereafter, it is dispersed in the base fluids. Monirimanesh (2016) gives the agglomeration is high in this method, because of its prolonged stages in the preparation.…”

“…The two methods are used to prepare the Nano fluids are single-step method and two-step method. For the preparation of SiO 2 and TiO 2 particles, two-step method is more suitable from Monirimanesh (2016). In the two step method, initially nano-scale sized metals, metal oxides, fiber particles and carbon nanotubes (CNT/NCT) are prepared.…”

Experimental Enhancement of Heat Transfer Analysis on Heat Pipe using SiO2 and TiO2 Nano Fluid

“…Then the dry powder is produced by various processes like chemical vapor condensation, mechanical alloying, etc. Thereafter, it is dispersed in the base fluids from Negin Monirimanesh [2]. The agglomeration is high in this method, because of its The evaporator section was heated by a nichrome coil surrounding at its circumference and the power supply to the Nichrome coil was given by auto transformer.…”

“…In the two scale sized metals, metal oxides, fiber particles and carbon nanotubes e dry powder is produced by various processes like chemical vapor condensation, mechanical alloying, etc. Thereafter, it is dispersed in the base fluids from Negin Monirimanesh [2]. The agglomeration is high in this method, because of its prolonged stages in the preparation.…”