This paper proposes a novel nine switch converter based integrated power conditioner in place of conventional twelve switch converter based power conditioner for improving power quality. Space vector modulation scheme is proposed for producing gating signals for nine switch converter. In the proposed integrated power conditioner the nine-switch converter replaces shunt and series converters fou...

PURPOSE The purpose of this study was to evaluate the efficacy of two different metal conditioners for non-precious metal alloys for the bonding of porcelain to a cobalt-chromium (Co-Cr) alloy. MATERIALS AND METHODS Disk-shaped specimens (2.5×10.0 mm) were cast with Co-Cr alloy and used as adherend materials. The bonding surfaces were polished with a 600-grid silicon carbide paper and airborn...

Reliable exposure factors are essential to determine health risks posed by chemicals in consumer products. We analyzed five risk-concerned product categories (anti-fogging, dye, disinfectant, repellent, and preservative products) for 13 products (three car anti-fogging products, a lens anti-fogging product, two car dye products, two drain disinfectants, an air conditioner disinfectant, a chlori...

In order to solve the problems of a heat pump air conditioner for an electric bus under extreme conditions, such as large compression ratio, high discharge temperature, reduced system performance, frequent shutdown compressor due overheat protection, this paper proposes vapor injection technology with economizer, and carries out theoretical analysis process reveal effect on performance conditio...

One of basic principles in designing treatment environments is to design air conditioning/ventilation system proportionate to environment. Essentially, appropriate air conditioner in treatment spaces must bear the following capabilities: providing healthy and clean air, reducing the concentration of pollutants produced in the atmosphere, emission of pollutants and impeding their spread in exter...

Performance evaluation of an air conditioner using R410a has been evaluated by field measurement pressure and temperature at suction discharge line. Two methods were used for measurement. First, the sensors mounted on outer wall pipe second, inserted into refrigerant flow in pipe. Using second method, is averagely 5.0°C lower 17.8°C higher than that first method. The coefficient performance pow...

The potential benefits of optimal service scheduling for cleaning heat exchangers based on minimizing operating costs are explored. A demonstration is performed on a simulated 20 ton air-to-air vapor compression air conditioner. The costs of regular service schedules (indicative of current practice), minimal schedules needed to maintain comfort, and the optimal schedules are compared. Generally...

To get comfortable air, it can be done by using an air conditioner or cooler. The electrical power used for the cooler is relatively lower. This research aims to see effect of number cooling pads on output condition and effectiveness was conducted experimentally. varying used, thick. distance between 1.5 cm. temperature inlet has a dry bulb 30

Split air conditioning units are usually used for small and medium scale residential buildings. Therefore, more energy efficiency and lower cost are needed along with reliable control for the air conditioning units. An experimental investigation has been carried out to study the performance of a direct expansion air conditioning (A/C) unit having a variable speed condenser fan. The modulation o...

Studies related to the effects of ambient temperature on performance an air conditioning unit have been carried out for decades. However, specific study concerning effect varied under constant relative humidity has not reported yet. This paper discusses operating conditions and conditioner with R32 nominal capacity 2.6 kW. The test was in a controlled psychrometric chamber 50% outdoor from 24 3...