Application of Vertical Flat Thermosyphon (VFT) Affecting on Performance Enhancement of Split Type Air Conditioner

The vertical flat thermosyphon (VFT) technology has been used in various formsand is becoming more prevalent.They are used in conjunction with cooling coils in air conditioning units.The front side of the coil acts to reduce the temperature of the airand the rear side coil acts to increase high temperature.Thecooling coils capability to condense the moisture will increase.The result is cooler than to recycle.This research project is to study the design, construct and compare the heat transfer rate, energy consumption, economic and statistical analysis,between before and after installation of closed loop oscillating heat pipe with check valves into cooling coils of split type air conditioner size of 12,000 BTU.The working fluids used in the experiment consists of three types as R134a, R410a and R22.Air velocity was 1.5, 2.0 and 2.5 m/s. Theindoor design temperaturewas 25 °C The result of the design found that the air conditioning system sensible heat was 1.40 kJ/s and latent heat was 1.295 kJ/s. The demand for re-heat was 423 J/s. The regression equations were used in this experiment to predict the theory heat transfer rate of dimensionless parameters was 431.20 J/s. Therefore lengths of the evaporator, the adiabatic and the condenser were 200, 150 and 200 mm respectively.Theexperiment found that the working fluids of R134a were the average of the highest specific moisture condensation rate was 0.97kg/kWh at the air velocity of 2.5 m/s (increased 18.57%) and the average of specific heat transfer was 97.32kW/m2. The average coefficient of performance (COP) was 1.90 (increased 21.79%), the average energy efficiency ratio (EER) was 6.47 (increased 21.39%) and the average of electric power consumption was1.62kWh which showed a decrease of 5.81%.