Takao Nagata Juhri Yasin Yasuhiro Kishi Ayumi Wada OVERVIEW: Hitachi has released 2.8 kW and 3.7 kW cooling-only inverter air conditioners featuring sleep support function in Southeast Asia, where the demand for room air conditioners for home use is accelerating, due to economic growth. In Southeast Asia, a high percentage of room air conditioners are used in the bedroom. Hitachi developed thes...

Most of the previous diagnostics research for vapor compression equipment has been performed for packaged air conditioners and chillers. This paper describes application of a decoupling-based diagnostic technique that was originally developed for air conditioners to equipment used in walk-in coolers and freezers. Testing was performed on a small, restaurant-style walk-in cooler and a small walk...

The system design of window air conditioner does not evolve in one day. Due to the continous efforts are taken by the refrigeration and air conditionging professionals, successful and economic models of window air conditioners are currently used. This paper states about the development of window air conditioner with phase change material and water as refrigerants. Developed air conditioner was ...

With the aim of identifying the fungus microbiota in air conditioners in intensive care units (ICUs) within public and private hospitals in Teresina, Piauí, solid material was collected from ten different ICUs. Thirty-three species of Moniliaceae and Dematiaceae were isolated, which was the first report of these in Piauí. High frequencies of Aspergillus niger Van Tieghem (60%), Aspergillus fumi...

Using the method of Fault Tree Analysis (FTA), in this paper, are analyzed the causes and modes of failure of air conditioners and automotive DC electro-ventilator, as part of automotive air conditioning system. Primarily, there was given a description of FTA method and of the importance of air conditioners and DC electro-ventilators in nowadays automotive industry. Secondly, based on a detaile...

In this paper,&#10 the application of evaporative cooling for refrigeration cycle to reduce power consumption in hot climates is emphasized. Experimental and analytical investigations were performed in order to specify the effect of evaporative cooling condenser instead of the commonly used air cooling condenser in window-air-conditioners. Evaporative condenser can reject more heat, thereby pre...

Fred Keller Split Systems Director The National Appliance Energy Conservation Act has established a minimum efficiency of 10 SEER for residential split system air conditioners and heat pumps. Approximately 50% of residential split system air conditioners are sold as replacements for units having much lower SEER levels, typically 5-9 Btu/W·h. This investigation assessed the detrimental affects t...

Increased demand for cooling and decreased demand for heating in the built environment is one of the main anticipated modes of adaptation to higher temperatures due to climate change. California’s residential sector uses relatively little electricity for heating. It is therefore expected that the demand for electricity will increase at the intensive margin as households operate existing air con...

In this paper, a mathematical model has been developed for group replacement of a block of Air Conditioners using discrete-time First Order Markov Chains. To make the model more realistic, three intermediate states viz., Minor Repair State, Semi-Major Repair State and Major Repair States have been introduced between Functioning State & Complete Failure States of the system. The Transition Proba...