Test Procedures
At first the coolant flow is opened to run through the condenser end to
ensure the condenser jacket is soaked and fully immersed with water.
Then the Variac is connected with the AC power source to produce
controlled heat by the heater. The power range is chosen from 2W to 16W
producing heat flux ranging 4.7 kW/m2 to 37.7
kW/m2 simulating the generated heat in a laptop
computer processor and similar electronic equipment [6]. It can be
noted, before wrapping the heater coil, its red-hot power limit is
checked and found to be 24W. Thus, the upper limit of 16W is quite safe
for the experimental purposes. Initially, the TMMHP is inclined at
0o (horizontally), and the time and temperature at the
evaporator are recorded until the system reaches steady state. The
experiment is continued by keeping the setup at 45oand 90o with evaporator uphill position. To attain
steady state, a minimum coolant flow rate of 400 ml/min or 70 ml/s has
been found to be reasonable to find the used coolant temperature equal
to ambient. Although the initial steady-state for 2W is achieved not
until ten minutes; however, the subsequent steady-states takes only
third of the time or less than three minutes.