RFP Attachment 9 - GPU Engine Derating Calculation Worksheet.pdf

Distribution Statement A. Approved for public release. Distribution is unlimited.

GPU Engine Derating Calculation Worksheet

1. Electrical Demand Calculation A. List worst case 400 Hz electrical load: _____ kW

(Includes any cable compensation and/or on-board electrical devices powered by the LRU)

1. List worst case full load 400 Hz LRU efficiency: _____ %

2. List worst case 400 Hz LRU A.C. alternator load: _____ kW

(Convert line 1A and 1A.1 to kW) B. List worst case 28.5 VDC electrical load: _____ kW

(Includes any cable compensation and/or on-board electrical devices powered by the LRU)

1. List worst case full load 28.5 VDC LRU efficiency: _____ %

2. List worst case 28.5 VDC LRU A.C. alternator load: _____ kW

(Convert line 1B and 1B.1 to kW) C. List worst case 270 VDC electrical load: _____ kW

(Includes any cable compensation and/or on-board electrical devices powered by the LRU)

1. List worst case full load 270 VDC LRU efficiency: _____ %

2. List worst case 270 VDC LRU A.C. alternator load: _____ kW

(Convert line 1C and 1C.1 to kW) D. List worst case total A.C. electrical load: _____ kW

(Greatest of lines 1A.2, 1B.2, and 1C.2 plus any miscellaneous on-board devices powered by the A.C. alternator.)

2. A.C. Alternator Demand Calculation A. List worst case A.C. electrical load: _____ kW

(From 1D above.)

B. List worst case A.C. alternator environmental deratings:

1. Altitude: _____ kW

2. Temperature: _____ kW

3. Other (specify): _____ kW

4. Other (specify): _____ kW

5. Other (specify): _____ kW

Total 1 through 5: _____ kW C. List worst case A.C. alternator efficiency: _____% D. Convert line 2.C to kW _____ kW E. List worst case total A.C. alternator electrical load: _____ kW

(Lines 2A plus any deratings from 2.B.1 through 2.B.5, plus 2.D) F. List continuous rating of A.C. alternator _____ kW (Line 2F shall be equal to or greater than Line 2E.)

G. Convert 2E to HP by ÷ 746: _____ HP (This is the engine HP required to provide the worst case electrical load.)

3. Engine Power Calculation A. List engine manufacturer continuous HP rating: _____ HP

B. List engine parasitic loads:

1. Engine fan: _____ HP

2. Battery charging alternator: _____ HP

3. Other (specify): _____ HP

4. Other (specify): _____ HP

5. Other (specify): _____ HP Total 1 through 5: _____ HP C. List worst case fuel derating (___ %) and convert to HP: _____ HP (List what the worst case fuel is for selected engine: ________________) D. List manufacturing tolerance (___ %) and convert to HP: _____ HP E. List engine aging (___ %) and convert to HP: _____ HP F. List worst case engine environmental deratings:

1. Altitude: _____ HP

2. Temperature: _____ HP

3. Humidity: _____ HP

4. Other (specify): _____ HP

5. Other (specify): _____ HP Total 1 through 5: _____ HP G. Total lines 3B through 3F: _____ HP H. Subtract line 3G from line 3A: _____ HP (This is the total engine HP available after derating.)

3. Available Power Calculation A. List line 2G, engine HP required for worst case electrical load: _____ HP B. List line 3H, total engine HP available after derating: _____ HP C. Subtract line 3A from line 3B: _____ HP (A positive number indicates enough HP is available; a negative number indicates enough HP is not available.)

Instructions for completing Engine Derating Calculation Worksheet

1. Offeror shall not modify the form and shall insert data (whole numbers only) in the spaces provided.

2. Line 1D shall contain all parasitic electrical loads such an ancillary power supplies, control system electrical demand, etc. Offeror shall provide justification if Line 1D is not greater than either Line 1A, 1B, or Line 1C.

3. Lines 2B, 2C, and 2F shall come from the A.C. alternator manufacturer’s data sheet. Use spaces entitled “Other” to list any deratings loads not provided on worksheet.

4. Line 3A shall be the engine manufacturer’s application engineering department continuous HP rating.

5. Line 3B shall contain all engine parasitic loads, use spaces entitled “Other” to list any loads not provided on worksheet.

5. Offeror shall provide justification, supporting rational, and engine manufacturer application engineering department guidance/concurrence as an attachment entitled “Engine Derating Exceptions” for any unused derating contained on lines 3C through 3F.

6. Line 3F shall contain all engine environmental derating, use spaces entitled “Other” to list any deratings not provided on worksheet.

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