General information Useful calculation data
7
Table 1 Heat input in Kilojoules (kJ) required to raise one kilogram (kg) of steam.
Boiler pressure bar g
Feedwater temperature °C
10
20
30
40
50
60
70
80
90
100
110
1
2665 2623 2581 2539 2497 2455 2413
2371 2329 2287 2245
5 2715 2673 2631 2589 2548 2506 2464 2421 2381 2338 2295 6 2722 2680 2638 2596 2555 2513 2471 2428 2388 2345 2302 7 2727 2685 2643 2601 2560 2518 2476 2433 2393 2350 2307 10 2740 2697 2655 2613 2573 2531 2489 2445 2406 2363 2319 12 2746 2704 2662 2620 2578 2536 2494 2452 2410 2368 2326 15 2752 2710 2668 2626 2584 2542 2500 2458 2416 2374 2332 17 2755 2713 2671 2629 2587 2545 2503 2461 2419 2377 2335 20 2759 2717 2675 2633 2591 2549 2507 2465 2423 2381 2339 25 2762 2720 2678 2636 2594 2552 2510 2468 2426 2384 2342
Table 2 Calorific value of various fuels (approximate values)
TYPE
CALORIFIC VALUE (kJ/kg)
ANTHRACITE
32,500
COAL
GOOD BITUMINOUS COAL
30,000
GOOD AVERAGE INDUSTRIAL COAL
28,000
POOR AVERAGE INDUSTRIAL COAL
21,000
GRADE
VISCOSITY
SPECIFIC GRAVITY
CALORIFIC VALUE (kJ/kg)
7.5 2
cSt
RED. 1 SECS
GAS OIL
4
35
0.835
45,600
OIL
LIGHT
50
210
0.935
43,500
MEDIUM
230
950
0.95
43,000
HEAVY
900
3500
0.97
42,500
GAS
3,600 kJ/kWh
AI-GAB-03 AB Issue 4
Page 2 of 3
The Cost of Steam - Metric
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