# Termodinamica- Eficiencia de un equipo termino (Refrigerador), Proyectos de Termodinámica Aplicada. Instituto Tecnológico de Celaya

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REFRIGERATION SYSTEM

Ma. Fernanda Pitalua Venegas A01410294

Emily Yulin Llera Chi A00513

INSTITUTO TECNOLÓGICO DE ESTUDIOS SUPERIORES DE MONTERREY

THERMODYNAMICS

In the following work we will analyze the simple cooling system of an air

conditioner, which is composed of a condenser, a compressor, an evaporator

and a valve. The main objective of this paper is to apply the knowledge acquired

in class to perform a mathematical analysis of a refrigeration system which

belongs to a domestic air conditioner. Depending on the technical specifications

of the product we will proceed to make the necessary calculations to obtain the

system’s Coefficient of Refrigeration and the exit Heat.

The use of refrigeration has proved to be of fundamental importance in food

preservation. It is, from the energy point of view, one of the most economical

methods of conservation; therefore we can't be without it. In addition, ambient

air conditioning has become very common and in many cases essential, not

only to achieve comfortable thermal conditions, but also to maintain an indoor

air quality acceptable to the occupants.

Modern society bases its way of life on an intensive consumption of energy, is

essential in almost all our daily tasks, and refrigeration, including air

conditioning, is a sector that has an important participation in this consumption.

A refrigerating machine is based on the physical property that the evaporation of

a liquid or the expansion of a gas absorbs heat, and the compression or

condensation give off heat. This machine applies the so-called cooling cycle.

This cycle obeys the law of perfect gases and the pressure-temperature

relationship:

P·V = R·m·T; where P is pressure, V is Volume, m is mass in kilos, R is the

universal constant of gases and T is temperature

In order to circulate the refrigerant and optimize its absorption of heat a

compressor is used. The compressor absorbs the refrigerant as a gas at low

pressure and low temperature and moves it compressing it towards the high-

pressure area, where the refrigerant is a gas at high pressure and high

temperature.

When passing through the condenser the heat of the refrigerant dissipates to

the environment. The refrigerant liquefies and continues under high pressure.

From there, it passes through the pressure regulating device which separates

the areas of high pressure and low pressure by a reduction of the passage

section. As the pressure drops, the refrigerant saturation temperature drops,

allowing it to absorb heat. Already on the low-pressure side, the refrigerant

reaches the evaporator where it absorbs the heat from the environment and

evaporates. From there it goes back to the compressor closing the cycle.

Due to the constant presence of refrigerating machines it was decided to take

one as an example to analyze, to better understand its operation and to be able

to apply the subjects seen in class.

METODOLOGÍA

The product that is analyzed is a domestic air conditioning brand Whirlpool

model WB230AB (air conditioning split 3500 FC). The product data sheet is

shown below.

Refrigerant Rate (Qin) = 3.5 KJ/s

Power (Wnet) = 1.090 KJ/s

Maximum circulation of air (Ċ) = 620 m3/h = 0.1722 m3/s

The refrigerant with which the equipment works is R410A, which is an ecological gas, since it does not attack the ozone layer. It is an almost azeotropic gas mixture, that means that in the liquid phase is a homogeneous gas, but in the gas phase, does not maintain a uniform mixture. It has a working pressure 1.6 times higher than the R22 refrigerant and also a specific compressed oil, Polyol Ester, which is different from R22, with a high degree of hygroscopicity, requiring special care of not to leave residues of moisture in the system.

Mass of the refrigerant that enters the equipment = 0.020 kg

Refrigeration diagram

QinW etout4321

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