Thiết kế và chế tạo động cơ nhiệt stirling sử dụng năng lượng mặt trời

Thinh Duc Nguyen et al Journal of SCIENCE and TECHNOLOGY 127(13): 73 - 76

73

CACULATION ANALYSIS AND DESIGN FOR CONSTRUCTION

OF SOLAR ENGINE MODEL

Thinh Duc Nguyen*

, Tuan Anh Vu, Du Van Nguyen

University of Technology – TNU

ABSTRACT

This research constructs a mathematical model of Stirling engines on Matlab, bases on the given

input as the power, speed, temperature, working gas, power loss to figure out the most suitable

design for construction of the engine that can reach the highest efficiency, simplify structure, and

easily operate. Then designing and simulating dynamic operation of physical model of the engine

on Inventor. Finally a real engine was manufactured and assemblied.

Keywords: Stirling engine; solar energy; mathematic model.

INTRODUCTION*

While fossil fuels are getting empty and every

nation has to face extreme influences due to

the global warming phenomena, it has raised

great demands on available replacements of

recycle and green energies in this decade.

Applications of stirling engine open a trend to

solve the existing problems. It is a kind of

external combustion engine using green

source and friendly with environment;

therefore, successful implementation of

stirling engines in social life resolves

environmental problems and contributes

much for a national economy.

Up to now, there have been any detailed and

successful researches on design and

production of stirling engines in Vietnam.

Early in 1983, Professor Ivo Kolin of the

University of Zagreb, Croatia, demonstrated

the very first low temperature differential

Stirling engine to an amazed audience. In

1992 Professor Senft was asked to design and

build a low temperature differential engine for

NASA. This engine, called the N-92, was

optimized for hand held operation, with a

temperature difference as low as 6°C enough

to power it. This reseach focused on

studying different types of stirling engines

which could be beneficial applications in the

local conditions such as solar water pump,

generator. [1] This paper presents our

* Email: [email protected]; Tel: 0946650662

successful work on design and optimization

process on the engine manufacturing with any

given inputs.

OPERATION

The working fluid is a gas operating under

relatively high temperatures and obeys the gas

laws. When the gas is heated and because it is

in a sealed chamber, the pressure rises and the

force due to its pressure acts on the power

piston to produce a power stroke.

When the gas is cooled the pressure drops and

this means that less work needs to be done by

the piston to compress the gas on the return

stroke, giving a net gain in power available on

the shaft.

The efficiency of any Thermodynamic cycle

increases as the average temperature of heat

addition increases. Regenerators are used for

this purpose [2].

Figure 1. The ideal Stirling Cycle

in PV and TS diagrams

Process 3– 4, isothermal expansion process.

Process 4–1, constant volume regenerative

transfer process.