Articles

  1. Refrigerators energy conservationDownload Article

    Manojkumar S, Vetrivel P

    Abstract

    close

    Investigations are under way to conserve energy in refrigeration and air conditioning system which alone contributes around 15% of total world’s energy consumption. Application of energy efficient compressors, air handling units (AHUs), condensers and evaporators of high effectiveness are the some of the measures towards energy conservation in refrigeration systems. Cooling of compressor shell with the defrost drips is an energy saving measure which is explored in this paper. The quantity of defrost water formation depends upon the types of stuffs preserved, methods of packing and preservation, frequency of door opening, duration of door opening and the relative humidity (RH) and dry bulb temperature (DBT) of ambient. In tropical countries which have 70 to 80% RH year round, the quantity of defrost formation is significant while refrigeration systems are on. This defrost water is dripped on the compressor’s shell, which in turn cools the compressor oil and hence reduces the friction losses and winding temperature of the motor. Once winding temperature is reduced the compressor’s ampere rating is reduced which ultimately reduces the energy consumption of the compressor. For given conditions of refrigerator function, the compressor shell temperature and ampere rating of compressor are tabulated and investigated before and after compressor shell cooling. The investigation reveals that around 8-10% energy savings are achieved for the given conditions.

  2. Enhancement of mechanical properties and machining parameter in cast aluminium alloysDownload Article

    Rajesh.S, Mr.M.K.Aravindan

    Abstract

    close

    The automotive industry uses an extensive range of aluminum HPDC (High Performance Deputing And Computational) parts, including transmission housings, cylinder heads, inlet manifolds, and engine sumps. This trend is increasing as the replacement of steel parts as lighter aluminum HPDC parts grows. In addition, formation of adhesive layers and a built-up edge (BUE) on the tool tip during dry machining reduce the quality of the machined surface.This journal Enhancement Of Mechanical Properties And Machining Parameter In Cast Aluminum Alloys By Combining LM25 With Boron Carbide in fabrication and mechanical investigation of aluminum alloy, alumina (LM25)and boron carbide metal matrix composites. Aluminum is the matrix metal having properties like lightweight, high strength and ease of machinability. Alumina which has better wear resistance, high strength, hardness and boron carbide which has excellent hardness and fracture toughness are added as reinforcements. Here, the fabrication is done by stir casting which involves mixing the required quantities of additives into stirred molten aluminum. After solidification, make the hole by the use of drilling process in different sizes like 10mm,12mm and 14mm. After that checking the surface roughness and its properties.

  3. Experimental study on properties of concrete by partial replacement of fine aggregate with bottom ashDownload Article

    Mr. Mohan Rajaa.M, Ms.D.Mythili

    Abstract

    close

    Concrete is the most widely used artificial construction material in the World and it is second to water as the most utilized substance on the planet. A Tremendous infrastructure development has taken place in the country (Throughout the world) and making of the concrete for higher strengths and higher durability to cater to the requirements are significant. Admixtures are the chemical compounds in concrete other than Cement, water, fine aggregate and coarse aggregate and mineral additives that are added to the concrete immediately before or during mixing to modify the Properties of the concrete. The addition of the admixture will improve the Properties of the concrete and also it should be taken care that it should not adversely affect the performance of the concrete. By the addition of Admixtures, the workability of the concrete is improved, the durability and Strength of the concrete is improved, the initial setting time of the concrete is increased and sometimes it retards the initial setting time of the concrete etc. Based on the literature review, it was observed that the admixtures Such as bottom ash, etc., put in Combination, will give better high performance and multi component concrete which can be used in the most adverse conditions. And based on various and Repeated trials, it was observed that by the replacement of the admixtures in The following Prepared and laboratory tests have been performed to determine the various Important properties of the concrete. The importance of the various Admixtures such as bottom ash. The optimum percentage of admixtures that gave Good mechanical and durability properties results based on trial and error method was selected

  4. Water obtained from a pre – cooled atmospheric air basis on humidity as a vital factor in a refrigerant system- a reviewDownload Article

    Ganesh.B, Hemnath.V, Pattabiraman.M

    Abstract

    close

    The following vital factors namely Humidity, Saturated humidity, Relative humidity, Dew point and vapor pressure are used over the compression cycle where we obtain our product water. In the compression cycle CO2 is used as a refrigerant which is used as mechanical systems refrigerant, marine services, hospitals etc.., due to its excellent safety properties. The relationship between the temperature and the ratio of atmospheric air to the water vapor has been discussed where at 40°C we obtain the max 49.8g/kg of water vapor. And this is the optimum temperature at which the atmospheric air is needed for the maximum efficiency of the system to obtain as the maximum amount of product water from this system.

Sign in

Registered and Approved by National Science Library (NSL),National Institute of Science Communication And Information Resources(NISCAIR),
Council of Scientific and Industrial Research,New Delhi, India"