HVAC Journal Database

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January - March 2004
I. Listing By Issues:	[ • 2004 • 2005 ]
Advantages of Open Recip Compressors By Krishna V. Jog Open recip compressors are manufactured by several companies in India and are the work-horses of the refrigeration industry. Why they remain popular and more commonly used than screw and semi-hermetic recips is explained in this article. Why are Screw Compressors Popular? By V. Sundarajan and Tony Payne Large screw compressors are displacing recips in many industrial refrigeration applications and centrifugals in air conditioning applications. This article explains the history of screws, their features, the uniqueness of the single screw and what makes them popular. Digital Scroll Technology By Simon Wang Ph.D and Arup Majumdar A new technology for capacity modulation in hermetic scroll compressors different fro the traditional inverter technology has been developed by Copeland especially for the Asian market where modulation is required for higher seasonal efficiency. This article explains the technology behind the digital scroll. Why Compressors Fail By Ramesh Paranjpey Refrigeration system designers and service engineers need to understand the limitations of a compressor and the importance of the total system design in the proper working of a compressor. Before blaming a manufacturer for a compressor failure, analyse the system and chances are the reason for failure lies elsewhere. Review of Inside Design Conditions in Air Conditioned Spaces By N. S. Hukmani The author suggests that a review be made of the current practice of specifying inside design conditions based on ASHRAE standards, as most people in the country dress in light weight cotton clothes and are chilled to the bone in many AC hotels, restaurants, auditoriums and offices. [ top]
April - June 2004
Air Conditioning the CII GODREJ- Green Business Centre By Ashish Rakheja and Dr. Prem C. Jain The design philosophy, energy modeling and some of the details that went into the design of the HVAC and other M & E services are explained by the consultants for the project. HVAC of GREEN BUILDINGS By R. V. Simha The reader is guided through the various options available to him, while designing the HVAC system for a green building. The environmental impact of chillers are well explained. SHEETAL MINAR: A combination of modern technology and heritage techniques By Surendra H. Shah The concept of pre-cooling the fresh air for the AC plant at the CII-Godrej Green Business Centre works well using traditional Indian methods combined with the Moorish wind towers of Spain. GREEN BUILDING DESIGN: An integrated design process to reduce energy By Mili Majumdar As energy consultants for the CII-Godrej GBC, the author gives the reader an overview of the design principles of green buildings in general and the Hyderabad project in particular. Green Buildings: Opportunities & Benefits By S. Raghupathy As director and head of CII-Godrej GBC and a person deeply involved in the project, the author talks about the potential for green buildings in India and lists the major green features built into the project. Variable Frequency Drives for Green Buildings By D. Uma Shankar Why variable frequency drives are ideal for green buildings is explained by the author. Thermal Energy Storage By Mark M. MacCracken, PE, Member ASHRAE The article attempts to set the record straight on the myths and reality of this technology. Designing Eco-Hotels By Valentine A. Lehr PE Eco-hotels and green buildings. What's the difference? None, as you will see, after reading this article. [ top]
July - September 2004
Superior Service will sharpen your competitive edge By Atul Mathur Everyone knows the importance of good service but there is no harm in stressing the issue again, in these days of tough competition. The author speaks from his background and experience in India. Lubricating Oil & Tear - Down Analysis of Reciprocating Compressor By Ramesh Paranjpey Analyzing a reciprocating compressor breakdown calls for detailed work and study. The author takes you step by step on a study of various failed parts to determine what went wrong. Very much like a post-mortem carried out on a human cadaver. Practical Considerations when Switching over to HFC-134a & HC from CFC-12 By Dr. R. S. Agarwal & R.S. Iyer With the phase out of CFC-12 all OEMs in India have had to change over to non-CFC refrigerants. Substitutes like HFC-134a and HC blends have now been adopted and this article compares the performance of these refrigerants with CFC-12 and the practical issues involved with the use. Maintaining Low Pressure Chillers By Abel Mascarenhas Upto now most maintenance personnel have not exercised much care in conserving R-11 refrigerant in centrifugal chillers since this is freely available in Inia. With the phasing out of R-11, beginning in 2005 costs will increase sharply and that's why it is essential to maintain your chillers with grear care. COOLING LOAD CALCULATIONS - Some Concepts & Mis-Concepts By N S Hukmani Some practical tips to help the engineer work out more accurate cooling load estimates and determine realistic plant capacities. Securing Clean Air Devices By Monisha Narke Filter performance and validation is becoming increasingly important. This article covers validation methodology, testing modes and device types. [ top]
October - December 2004
HVAC for OFFSHORE PLATFORMS (Part 1 of 2) By M. P. Ravindranathan Air conditioning offshore platforms is a highly specialized area of activity and hardly any consultants (other than EIL) or HVAC contractors have ventured into this area. The author, in this two part article, does a great job of removing the air of mystery surrounding. Air Conditioning Saifee Hospital & Research Centre By S. K. Murthy & Sandeep Nair This newest addition to Mumbai's growing list of hospitals will be commissioned shortly and the consultants explain their philosophy behind the HVAC system design. A question-and-answer style makes for easier reading. Faster Pull Down in Refrigeration Plants By Krishna V. Jog Very often forgotten and sometimes overlooked, the pull-down period in a low-temperature refrigeration plant, if not initially specified, can cause big headaches late, specially in a batch cooling process. Container Refrigeration (Part 1) By C. Maheshwar Refrigerated Containers are used to transport our growing exports of frozen meat, seafood, and fresh fruits. This, the first of a series of articles on the subject, will help readers learn more about this application of refrigeration technology. What's up with Cooling Towers By Frank T. Morrison The advantages of a water-cooled system, types of cooling towers available, importance of capacity certification, closed circuit towers, new hybrid designs and water treatment issues are all well explained in this article. [ top]
January - March 2005
Air Conditioning for Synthetic Fibre Plants By S. Sankaran Design of air conditioning systems for synthetic fibre plants has generally been the preserve of a limited number of design-build HVAC contractors who are trusted by fibre manufacturers to deliver the goods. Important aspects of design are explained. Humidification for Textile Mills By M.M. Roy Processing raw cotton to finished fabric is dependant on the maintenance of the proper relative humidity in the various departments. The author first describes the steps in processing raw cotton and then the humidification and filtration systems employed. AIR WASHERS - A new look at a vintage technolgy By M. El-Morsi, S.A. Klein and D.T. Reindl Air washers, commonly used in textile mills and synthetic fibre plants today were first used by Dr. Willis Carrier almost a hundred years ago, when the design and installation of air conditioning plants first came on the scene in America. Special AHU Designs Aero-acoustic technology can be used to save space, reduce energy as well as noise & vibration in design of air handling units By Dipti Datta The standard design air-handling unit with centrifugal blowers is in for a radical change with special designs described by the author in this article. Hundreds of such designs are operating successfully in the USA in auditoriums, office buildings, clean rooms and pharma plants. HVAC for OFFSHORE PLATFORMS (Part 2 of 2) By M. P. Ravindranathan This concluding part gives full details of equipment normally selected and used, type of ductwork, piping, insulation and electrical work carried out as well as the paperwork required before final handing over can be said to be complete by the purchaser. Container Refrigeration (Part 2) By C. Maheshwar This second part of the article explains how specified temperatures are controlled and maintained both for above and below freezing temperatures. Normally selected temperatures for a variety of fruits, vegetables, flowers, diary products and meats are furnished. [ top]
April - June 2005
Cooling the Taj Group of Hotels By K.D.Deodhar Air conditioning at the Taj Mahal Hotel in Mumbai was first installed over 60 years ago. What the engineering team has learnt over this period has now been summarized in this article. Six Key Steps in Hotel HVAC Design By Pradeep Nadkarny There are many involved in designing a hotel's HVAC system, but the six steps that are most important are detailed here. Air Conditioning Restaurants By Rumi H. Bharucha Stand-alone restaurants that are not the first part of a large hotel have their own set of problems to face. How they normally handle their HVAC needs are described by the author. High-Delta T Chilled Water Systems By R. V. Simha The successful performance of such systems depends on careful selection of chilled water-cooling coils and control valves. How exactly this is done is explained in an example. Cold Rooms at Grand Hyatt Mumbai - Green Business Centre By Prem Thakur Prefabricated cold rooms with PUF insulation, convenient accessories and dependable refrigeration equipment makes life easier for the maintenance staff. CO2 Levels in Auditoriums By M.M. Chauhan, J.V. Bholanda & A.K. Manglani What you cannot measure, you cannot control. Actual measurements carried out in four auditoriums in Vadodra will help HVAC engineers to become aware of air quality and not just temperature. Container Refrigeration (Part 3) By C. Maheshwar Controlled atmosphere conditions in containers and how they are maintained is the subject. [ top]
July - September 2005
A Packaged Air Conditioners: The Scene in India By R. Muralidharan Iyengar A broad overview of the type and range of packaged air conditioners available in India and the future trend. Packaged Cooling for Comfort By Sunil Khatwani Standard packaged air conditioners designed for comfort are widely used for several applications. Ducted Splits for Special Applications By B Gautham Baliga Restricted only by one's imagination and engineering skills, ducted splits with custom-built air handlers cater to a variety of special applications. VRF Units for Perimeter Zone Control By M. H. Lulla Variable Refrigeration Flow (VRF) units are slowly finding a firm foothold in the country with their many special features. An unusual application is explained. The US Market for Packaged Air Conditioners By Wei Sun, PE The largest market in the world for "unitary products" including packaged air conditioners and how it has developed some designs for its special needs. Designing a Cold Storage and it's Refrigeration System By Ramesh Paranjpey The article explains the thinking process that helped two engineering students from Pune win an ASHRAE Global Award for a cold storage design. Container Refrigeration (Concluding Part 4) By C. Maheshwar The evolution of temperature recording systems used in reefer containers from the days of log sheets to remote monitoring currently in use. [ top]
October - December 2005
Managing Water Quality in Chillers By N. S. Rao Inspite of severe water shortage in all major cities of the country, water-cooled chillers are commonly installed in major hotels, hospitals, airports and industry. How to manage water quality on such projects is the subject of this article. UVC Lamps Can Keep AHUs Clean By Ashoke Sarkar Keeping cooling coils and drain pans inside AHUs clean and free from fungus and slime can be a formidable task. How high output HVAC type UVC lamps have helped and in the bargain enhanced IAQ and saved energy are described. Duct Cleaning By Shankar Sapaliga Introduced in India about five years ago duct cleaning is now being gradually accepted by maintenance engineers as another routine job to be carried out in Hotels, hospitals, office buildings and wherever central systems are installed. Chemical Cleaning of Finned Coils By Yashwant Jhaveri Developed in the country many years ago this chemical coil cleaner has been successfully tried out all over India. The article explains how it is applied and how its effectiveness can be measured. Restorative Drying By Jagdeep Singh The floods in Mumbai on 26/7/2005 caused massive loss of life, property and goods. Psychrometrics and dehumidifiers came to the rescue by providing drying services for water-damaged valuable paper records, appliances and electronic items. Refrigeration Systems for European Supermarkets By Ian Armstrong How refrigeration systems for supermarkets have evolved over the years in Europe will give engineers in India an idea of what to expect in the new supermarkets that will soon come to this country as well. [ top]