single cylinder four-stroke gas engine

Question

(b) The following data released to a test trial of a single cylinder four-stroke gas engine:

1. Cylinder dia. 24 cm. stroke length 48 cm.
2. Compression ratio = 5.9
3. Net brake load applied at brake wheel having an effective circumference of 3.86 m is 1260 N at average speed of 227 r.p.m.
4. Number of explosions/minute = 77
5. Gas used/mt at 771 of mercury and 15⁰C = 0.217 cum
6. Lower calorific value of gas at NTP = 49350kJ/m³.
7. Mean effective pressure from indicator card = 7.5 bar
8. Weight of Jacket cooling water/mt = 11 kg
9. Temperature rise of cooling water = 34.2 ⁰C
10. Specific heat of water = 4.2 kJ/kg ⁰C

Estimate (i) mechanical efficiency, (ii) indicated thermal efficiency and (iii) efficiency ratio, and draw a heat balance sheet for the engine assuming hat exhaust gases carry away 24% of heat.