Design And Construction Of A Refrigerating Unit

Project and Seminar Material for Chemical Engineering

Design And Construction Of A Refrigerating Unit


The design and construction of s refrigerating unit is handled from the knowledge of the working principles of laws of thermodynamics.

The size of the containing vessel i.e the case as established to be of 45cm by 32 cm in dimension. The Angle iron mild steel to used in the fabrication and welding. The box case of two layers are fabricated. Plastic (cooler) box is then placed inside the upper part with the other parts of the refrigerator were brought in. they were all fixed onto a wooden base with all the connections (electrical) made.

The capacity of the refrigerator is based on the workdone by the compressor which is O.I hp in specification. The size of the components used are

i. Condenser:

The size is 0.1hp and it is a plate type condenser with extended surface.

ii. Compressor:

The size is 0.1hp (75 watts)

iii. Copper wire:

it is of 0.5cm in diameter and the total copper wire length is about 600cm (1½ roll)

The introduction of cooling fluid and filling of the compressor enabled the compressor to start functioning when connected to electricity using a 13 AMP rated socket

The interior of the plastic box is lined with dominium box with tubes arranged in convolution around it. This world effectively and cooled the water dropped into it. It compares favorably with the ones in the market.

Chapter One

1.0 Introduction

Refrigeration is the process of lowering the temperature of a substance below that of its surrounding.

Refrigeration is the practical application of the first and second law thermodynamics. Comprehensive understanding of the basic principles of thermodynamics is crucial for full understanding of basic operation of refrigerator. The first law states that the energy can neither be created nor destroyed. If energy of 2.5J appears in one forms it appears in another without a corresponding decrease of energy on the other form. The second law states that no system can receive heat at a given temperature and reject it at a higher temperature without receiving work from the surrounding heat always flow from Warner to cooler body.

Through consideration of these laws, the ideal refrigeration cycle are considered. The carnot cycle is reversible and consist of adiabatic compression witherma rejection of heat, adiabatic expansion and wothermal addition of heatl the carnot cycle is unattainable ideal which serves as a standard of comparison and it provides a convenient guide to the temperature that should be maintained to achieved effectiveness. The efficiency or coefficient of performance (C.O.P.) of a carnot cycle depends on the temperature at which heat is added and rejected.

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