Integrating a Saving Energy controller in Existing Air Condition units Case Study

TLC - Temperature Limit Control Unit requirements Fits to any existing A/C (Air Condition) system Does not require any modification in the existing controller of the A/C Hidden inside the A/C unit Enables limits for both Cooling and Heating Saving Energy will not disturb the users of the A/C Easy, quick and simple installation TLC – miniature Temperature Limit Controller

TLC – operation mode T1 – Return Air Temperature sensor T2 – Supply air Temperature sensor Supply 230VAC Supply 230VAC A/C controller output to compressor line To Compressor Heating Temp. Limit knob Heating Temp. Limit knob Cooling Temp. Limit knob Cooling Temp. Limit knob

TLC – Features Saves energy and electricity costs without disturbing the A/C users Overriding the energy waste of end-users who select high Heating set-point and low Cooling temperature set-point Very small unit that fits into any existing A/C system Very Simple (2 knobs) adjusting Easy installation – Does not require any external or internal preparations

Test procedure The test was made along 6 months in 4 different departments TLC was installed in each A/C on the output line from the control electric board of the A/C to the compressor 2 Time counters were installed in each A/C Counter 1 – on the line before the TLC (counting the hours that the A/C controller set the compressor to work) Counter 2 – on the line after the TLC (counting the hours the compressor is actually working)

Test procedure From the A/C control box To A/C compressor Counter 1Counter 2

Results by departments Energy Saving % Counter 2 (hours) (after TLC) Counter 1 (hours) (before TLC) AREA 60% Department 1 (Electric dept.) 39% Department 2 (Fire Safety dept.) 67%41124 Department 3 (Sanitation dept.) 17% Department 1 (A/C dept.) 40% Saving Average: The test showed an average of 40% saving in the working hours of the compressors comparing to A/C units without TLC installed

Air Condition units (window, top, split, mini-central) Total labor hours plant 2400 Total working hours for 1 A/C (60% of the time)1440 Average energy consumption of A/C2.5 KW KW/Hour cost (localy)13.5 cents A.C operation cost per hour2.5 * 13.5 = cents Total yearly expenses per A/C without TLC1440 (hours) * cents = 486 US$ Total savings per A/C per year (30% calculation) is US$ Savings calculations

Total savings for one A/C unit (yearly)145 US$ Investments costs (TLC + installation)100 US$ Return of investment within 8 months (100/145 = 0.68) A/C units in plant7000 Summary Total yearly savings 7000 * 145 US$ = US$

Adding TLC in all 7000 plants A/C units Will save 1 Million US$ On yearly electricity bills - Which are 5% of the total Electricity bills of the plant Conclusion