PHOENIX OIL HEATER. Producing advanced oil heaters with innovative technology. Efficiency you can measure at the gas meter. EFFICIENCY = STACK TEMP. PHOENIX OIL HEATER is a division of ARIZONA BOILER COMPANY, INC. doing business since 1960.
Producing advanced oil heaters with innovative technology. Efficiency you can measure at the gas meter.
True efficiency can be measure by comparing the stack temp with the outgoing oil temp.
We start with double Helical coil design for three passes of the hot gasses over the coils.
We don’t stop there. We add heat transfer fins that also serve to break up the smooth flow of hot gases over the tube coil surface. This creates a “scrubbing” action that forces more heat out of the hot gases and into the thermal oil. In heaters without the scrubbing fins, the hot gases will migrate to the lowest pressure area which happens to be the exhaust stack. Those hot gases must be forced to pass thru the lower areas of the coils.
Double helical coils being put together, with heatmizer fins. Also, notice the dimpling on the coil material. This breaks up the “smooth” flow of oil on the inside of the coil. This added turbulence further increases heat transfer efficiency.
Double helical coils installed in heater shell. Notice: No internal refractory needed. The two coils are put together in a such a way that all oil must pass thru both coils; not half the oil thru one and half the oil thru the other as some heaters do. This does create a little more pressure drop over the coil, but the large circulating pump is a small price to pay for the increased efficiency.
Completed PHOENIX HOT OIL – High Efficiency Oil Heater with high efficiency Limpsfield burner. We can supply the heaters with or without expansion tanks and circ pumps.
High efficiency Limpsfield burner. Clean burn with 2.4% excess O/2. Autoflame micro-modulation for precision tuning. No linkage to need lubrication or maintenance.
The Limpsfield achieves complete combustion with less excess air and less travel space thru the heater. Both of these result in greater efficiency.
Setting up the Autoflame controls for precise calibration and modulation.
Efficiency measured by excess air coupled with exhaust gas temperature.
Autoflame Mk5 burner control, outgoing oil temp high temp cut-off, and stack temp for backup safety.
Autoflame is the premier Precision burner control on the market today. We use only the best.
Pressure differential switch above the control panel to confirm that oil is flowing thru the heater. If not, the burner shuts down.
Setting the air/fuel ratio for best efficiency with the combustion analyzer on the left.
Firing rate of 100% with outgoing oil temp at 399F. The high temp cut-out next to the Autoflame control reads 465F. The Autoflame is slower to change.
Actual combustion reading on high fire. O/2 at 2.3% equates to excess air of 12%. The efficient shown of 95.7% is gross efficiency. Net efficiency would be around 84%.
STACK HIGH TEMP PROTECTION Efficiency
SUPPLY OIL TEMPERATUREHOT OIL SUPPLY TEMP
Outgoing oil temp- 465F - Stack temp reading 328F. This instrument is slower to react than the “In stack” thermometer. Actual stack temp at this time is 390F.
Return Oil temp - 413F with outgoing oil at 465F and stack temp at 390F. This at over 50% firing rate is unheard of in the oil heater industry.
Actual Stack temp of 390F with hot oil temp at 465F.
STACK TEMP 75’F BELOW OIL TEMP
REAL EFFICIENCY YOU CAN MEASURE AT THE GAS METER