Determining the Efficiency of the Hot Air Engine as a Heat Engine

The Hot-Air Engine Efficiency Experiment is designed to determine the thermal efficiency of a hot-air engine by comparing the mechanical work produced with the heat transferred during operation. The engine is loaded using a dynamometric brake, allowing the output torque and rotational speed to be measured accurately. The heat rejected is determined from the temperature rise of the cooling water, enabling students to evaluate the efficiency of the engine as a heat engine. Manufactured by Atico Export India.

Principle

The experiment is based on the conversion of heat energy into mechanical work. The mechanical work produced by the hot-air engine is calculated from the braking torque applied by a dynamometric brake and the rotational speed of the engine. The heat rejected by the engine is determined from the temperature increase of the cooling water. By comparing the mechanical work output with the thermal energy involved, the efficiency of the hot-air engine can be determined.

Objectives

• Determine the thermal efficiency of a hot-air engine.
• Measure the mechanical work produced by the engine.
• Calculate engine output using braking torque and rotational speed.
• Measure the heat transferred to the cooling water.
• Study energy conversion in a heat engine.
• Analyze the performance of a hot-air engine under load.

System Components

Hot-Air Engine :

• Quantity: 1

Power Measurement Accessories :

• Quantity: 1 Set

U-Core with Yoke :

• Quantity: 1

Clamping Device with Spring Clip :

• Quantity: 1

Mains Coil :

• 500 Turns
• Quantity: 1

Low Voltage Coil :

• 50 Turns
• Quantity: 1

Electronic Counter :

• Quantity: 1

Fork-Type Light Barrier :

• Quantity: 1

Multi-Core Cable :

• 6-Pole
• Length: 1.5 m
• Quantity: 1

Analog Multimeter :

• Quantity: 2

Mechanical Hand-Held Stopwatch :

• Quantity: 1

Precision Dynamometer :

• Capacity: 1 N
• Quantity: 1

Thermometer :

• Range: -10°C to +50°C
• Resolution: 0.1 K
• Quantity: 1

V-Shaped Stand Base :

• Quantity: 2

Stand Rod :

• Length: 25 cm
• Diameter: 12 mm
• Quantity: 1

Stand Rod :

• Length: 47 cm
• Diameter: 12 mm
• Quantity: 1

Right-Angled Stand Rod :

• Quantity: 1

Multi Clamp :

• Quantity: 2

Plastic Beaker :

• Quantity: 1

Weights :

• 50 g
• Set of 12
• Quantity: 1

Connecting Leads :

• Current Rating: 19 A
• Length: 50 cm
• Red/Blue Pair
• Quantity: 1

Connecting Leads :

• Current Rating: 32 A
• Length: 100 cm
• Color: Black
• Quantity: 3

Immersion Pump :

• Quantity: 1

Low Voltage Power Supply :

• Output: 3 / 6 / 9 / 12 V
• Quantity: 1

Silicone Tubing :

• Diameter: 7 mm
• Length: 1 m
• Quantity: 2

Wide-Mouthed Can :

• Capacity: 10 L
• Quantity: 1

Hot-Air Engine System :

• Designed for studying the performance and efficiency of a hot-air engine.

Dynamometric Brake :

• Measures braking force for accurate calculation of mechanical work.

Speed Measurement :

• Fork-type light barrier and electronic counter provide precise rotational speed measurement.

Cooling Water Measurement :

• Temperature rise of the cooling water is used to determine heat transfer.

Complete Experimental Setup :

• Includes electrical, mechanical, and thermal measurement accessories.

Educational Design :

• Ideal for demonstrating thermodynamic efficiency and heat engine principles.