Basics of Thermodynamics

-

 Thermodynamic System

It is defined as quantity in space bounded by real or imaginary, fixed or movable boundaries across which energy take place from or to surroundings.

External to the system is called surrounding or environment.

A system with surrounding called a universe.


Type of System

Open System
In this system, energy transfer takes place along with boundaries with mass transfer.

Eg. Water in pool

In pool mass and energy , both transfers can take place.

Closed System

In this system, energy transfer takes place with the outside environment through the boundary without mass transfer.

Isolated System

A system without mass and energy transfer is called an isolated system.



Thermodynamic Equilibrium

It is a state in which the system has a thermal and mechanical equilibrium.

Energy

It is the capacity to do work.

Types of Energy

Potential Energy

It is the energy stored in an object due to its position relative to some zero position.

Kinetic Energy

It is the energy of a given mass due to its motion.

Internal Energy

The energy due to molecular motion and its configuration.

Heat Energy

It is the form of energy transferred across boundaries of a system by virtue of temperature gradient.

First Law of thermodynamics

-It is based on the Law of conversion of energy. As per the law of conversion of energy "total energy of an isolated system is constant, Energy neither be created nor be destroyed but can be transferred from one form to another.

"Whenever a closed system executes a cyclic process , the algebraic sum of work transfer is proportional to the algebraic sum of heat transfer"




Second Law of thermodynamics

A. Clausius 

It is impossible to construct a device operating on a cycle whose sole effect is the transfer of heat from low temperature to high-temperature body.

B. Kelvin-Planks 

It is impossible to construct a heat engine operating on a cycle whose sole effect is the transfer of heat energy from a single heat reservoir and its conversion into an equal amount of work.




Thanks for giving your valuable time.


Plz subscribe the channel and like the Facebook page

and provide your feedback or suggestion on - learnhvac003@gmail.com

<script data-ad-client="ca-pub-1537404035517009" async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>

Comments

Post a Comment

Thanks for Your Comment

Popular posts from this blog

MEP Basics

-
Image
  MEP - M echanical E lectrical P lumbing   MEP refer to Mechanical, Electrical and Plumbing Civil engineering gives shape to building but MEP engineering brings facilities in building so that human can live a comfortable life.   Everything inside a building which makes it safe and comfortable to be incomes under the title building services. HVAC – HEATING VENTILATION & AIR CONDITIONING Heating As name suggest its main purpose is to generate heat which can be achieved by various equipment like heater, boiler, furnace or heat pump to heat water, steam or air in a central location such as a furnace room in a home or a mechanical room in large building. Ventilation It is a process in which air is replaced or exchanged for a particular area to control moisture, odours, smoke, heat, dust airborne bacteria, carbon-di-oxide and maintaining oxygen level. It has two types first one is natural ventilation in which air is exchanged naturally and the second one has forc...
Read more

Pain of Contracts and Procurement

-
Image
       Pain of Contracts and Procurement Every Profession has its own challenge and pride , as a professional it’s depend on us how we tackle them.C&P is integral part of organisation, and has potential to impact company performance. Contracts and procurement department also have some advantages and disadvantages. Everyone knows the benefits,  however I  have tried to highlight the few challenges based on my experience. Time There is a saying that “curd does not freeze on hand” but it does not apply in construction, here everything is urgent. Here today you will get the requirement and next day material shall be required on the site. And if you ask for more time, then it will be said directly that you do not know the pain of the site and you don't care about the progress of the site. Every company has a process to award the work, and it takes time to award any package.  One thing we have to understand that contracts is not about on-boarding...
Read more

VRV/VRF Overview

-
Image
                   An Over View of VRV/VRF System   VRF/VRV is an air-conditioning technology, in which refrigerant is conditioned by single or multiple condensing units (which may be indoor or outdoor, water or air-cooled) and is circulated to multiple indoor units within the building.   It allows end user for individual control over temperature and airflow in different zones in building where it is used for air-conditioning purpose, which makes them a popular choice for large commercial and industrial buildings, such as office buildings, hotels, and schools. It consists of an outdoor unit, which contains the compressor and condenser, and one or more indoor units, which contain the evaporator and fan. The refrigerant is circulated as per requirement between the outdoor and indoor units, where it is cooled or heated as needed. Popularity of these system are growing in India due to...
Read more