A gas engine working on the constant-volume cycle gave the following results during a one-hour test run. Cylinder diameter 24 cm; stroke 48 cm; torque 770 Nm; average speed 220 rpm; average explosion per minute 77; mep 7.5 bar; volume of gas used 12 m³ at 17°C and 770 mm of mercury pressure; lower calorific value of gas 21 MJ/m³ at NTP; inlet and outlet temperature of cooling water are 25 °C and 60 °C respectively; cooling water used 600 kg. Determine (i) the mechanical efficiency (ii) the indicated specific gas consumption in m³/kWh and (iii) the indicated thermal efficiency. Draw up a heat balance for the engine on minute basis, explaining why friction power has been included in or omitted from your heat balance. NTP conditions are 760 mm of Hg and 0°C.

A gas engine working on the constant-volume cycle gave the following results during a one-hour test run. Cylinder diameter 24 cm; stroke 48 cm; torque 770 Nm; average speed 220 rpm; average explosion per minute 77; mep 7.5 bar; volume of gas used 12 m³ at 17°C and 770 mm of mercury pressure; lower calorific value of gas 21 MJ/m³ at NTP; inlet and outlet temperature of cooling water are 25 °C and 60 °C respectively; cooling water used 600 kg. Determine (i) the mechanical efficiency (ii) the indicated specific gas consumption in m³/kWh and (iii) the indicated thermal efficiency. Draw up a heat balance for the engine on minute basis, explaining why friction power has been included in or omitted from your heat balance. NTP conditions are 760 mm of Hg and 0°C.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

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gas engine working on the const ant-volume cycle gave the following
results during a one-hour test run. Cylinder diameter 24 cm; stroke
48 cm; torque 770 Nm; average speed 220 rpm; average explosion per
minute 77; mep 7.5 bar; volume of gas used 12 m at 17°C and 770 mm
of mercury pressure; lower calorific value of gas 21 M.J/m³ at NTP;
inlet and outlet temperature of cooling water are 25 C and 60 °C
respectively; cooling water used 600 kg. Determine (i) the mechanical
efficiency (ii) the indicated specific gas consumption in m/kW h and
(iii) the indicated ther mal efficiency.
A
1.1
Draw up a heat balance for the engine on minute basis, explaining why
friction power has been included in or omitted from your heat halance.
NTP conditions are 760 mm of Hg and 0 C.

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