PDF Drive is your search engine for PDF files. As of today we have 78,, eBooks for you to download for free. No annoying ads, no download limits, enjoy . HVAC: handbook of heating ventilation and air conditioning / Ali Vedavarz, This book or parts thereof may not be reproduced, stored in a retrieval system. The HVAC Components and Systems module of the Vital Signs Project was developed Walter Grondzik was Principal Investigator (and author) for the HVAC.
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The sponsoring editor for this book was Linda Ludewig, the editing supervisor was David E. Wang published two air conditioning books and. Basic HVAC Scheme for Plants. .. Coordination of HVAC and Fire Detection and Alarm System E. Noise and Vibration. HVAC Books related to heating ventilation and air conditioning design and control,Plumbing training books Industrial refrigeration Chillers and plumbing training books and manuals are available. Practical Electric Motor Handbook pdf.
Remember the fundamental fact: Evaporation causes cooling! So, in order to cause cooling, we evaporate the refrigerant by causing it to get in contact with air at room temperature in a heat exchanger evaporator.
Heat exchange happens between air in the warm area or the area to be cooled and the liquid refrigerant. The refrigerant goes to the Vapour State as it has absorbed heat and the room is cooled. We need to bring back the refrigerant to its liquid state, so that we can continue the cooling cycle above. For that we need the refrigerant to reject the heat it has absorbed from the conditioned space. But the problem is that it is already at ambient temperature and so there is no temperature difference for heat transfer to take place.
So, this vapour is compressed in the compressor to increase its pressure and therefore its temperature, i.
In the condenser stage the heat absorbed by the refrigerant is rejected, by passing the hot refrigerant gas through a heat exchanger Condensor where ambient air is used to cool the refrigerant from its hot vapour stage to liquid stage. Low temperature, high pressure. This cycle is continued. The above example is a Vapour Compression Cycle, which is most commonly used. Another method of providing cooling is the Vapour Absorption Cycle, which is slowly gaining acceptance in certain applications.
This uses, steam as one of the components to produce cooling! Thermax are one of the people offering this system where steam is required for process and cooling is required for comfort applications.
That is another story, another time! There are 2 classification of air conditioning systems, namely the DX system and Centralised System. In case of Split AC, normally there can be no provision for fresh air to enter the room. But in window AC there is a provision for letting in fresh air. These are, as the name suggests, wall mounted. Split units: 1 TR, 1.
These are normally ceiling mounted. Packaged units are slightly bigger in size in capacity of cooling and in the range of 5 TR, 7. One difference in packaged units is that the evaporator with expansion valve and the compressor is in one unit and the condensor unit is outside. These are normally floor mounted. Common fault,blower status and heater status can also be monitored in case of Precision ACs Ce nttralliise d Systte m:: Ce n ra se d Sys e m This is for larger capacities of cooling requirements.
It uses a.
A Chiller to produce the cooling centrally b. Ahus Air Handling Units to provide cooling locally, by using the cooling energy produced at the Chiller. The Chiller and its components are usually referred to as the High side and the Ahus and the components are referred to as Low side of the HVAC contract.
Chiilllle r:: Each chiller is controlled by a microprocessor-based control panel. Each chiller has its own Ch e r evaporator, compressors, condenser and expansion components. In other words an expanded room air-conditioner, expanded multifold times.
The water used in a chiller system is DM demineralized water. The only difference is that the capacity of the compressor is much more. This Chilled water which is at a temperature of 5. Hence in a chiller system the refrigerant does not directly cool the warm area.
The above diagram shows 3 chillers. The primary pumps are used to pump the water into the chillers.
Depending upon the amount of cooling required the compressors in each chiller is switched on or off. The secondary pumps pump the cool water coming out of the chillers into the cooling coils of the various AHUs present in the building.
There are basically 2 types chilled water distribution.
In case of constant flow a constant amount of chilled water is sent from the chillers into the cooling coils of the AHU. Just remove the secondary pumps in the above sketch and you have a constant flow system.
In case of variable flow system, apart from the primary pumps which circulate constant flow through the chiller, secondary pumps are present which vary amount of water flowing into the cooling coils of the AHUs.
The refrigerant in the chiller is either air-cooled or water-cooled. In case of water-cooled chillers the cooling tower is used to cool the water which cools the refrigerant.
The cooling tower has fans. There is make-up water available to make up for any loss of water. A measure of the load condition is the difference between the supply and return header temperatures. By measuring this difference, the load can be determined and energy saving means adopted, as will be illustrated below: If there is only one chiller, the microprocessor of the chiller will receive inputs of the supply and return header temperatures, apart from safety interlocks like water flow, refrigerant pressures etc and based on the difference, a decision on how many compressors can be switched on will be determined.
Example: Let us take the case of 2 chillers, each with its own microprocessor panel. This is because the microprocessor of chiller 1 will not know that there is another microprocessor panel of chiller 2 next to it.
Assuming no BMS or any other controls from Chiller manufacturer. Each chiller will switch off one compressor, as both the chillers have received same supply and return header temperature input. Please Note: Whether BMS is there or not, the chiller manufacturer will use temperature sensors in supply and return line of the chiller as inputs to the microprocessor. You can also learn all about energy efficiency in detail, along with all the code alert features.
There are realistic illustrations along with the content as well, so you understand better 4. From the very basics of heating and cooling systems to the latest technologies being used in the HVAC field, you can get all your desired information in this book.
It also provides a review of the basics such as installing, wiring, and troubleshooting a system This book also lets you know which kind of system is best for what situation, according to the climate and the requirements Not only used for systems, this book is also a guide for the different fuel types and which fuel works best for which kind of system. This book makes it very easy to install, maintain, and troubleshoot conversion units.
It covers all the topics, situations, problems and their quick fixes which make it a total solution for the HVAC trainees and professionals. This HVAC training book is well known for its high quality of illustrations and the plethora of technical hints provided in the book.
Along with these, this book also has tips from industry experts, review questions, and a whole lot more!
The main content covered in this book include the introductions to heating, cooling, and air distribution systems, and the practices commonly used in piping, among more topics.
With all the information that is present about the HVAC industry, it is not possible for one person to learn and remember all of it. But if you stop learning, you resign your business to stay stagnant and stop growing. These books will you the tools needed for you to keep up with the pace of the industry. I have worked for five years as a professional in the HVAC industry.