Papers by Keyword: Air Conditioner

Abstract: Ceiling cassette air-conditioning units play a pivotal role in the HVAC industry, renowned for their high efficiency, especially in high-rise buildings. However, the routine maintenance of these units poses significant challenges. The current methods are labor-intensive, time-consuming, and wasteful of water, leading to adverse effects on workers' health due to chemical exposure and the physical strain of manual cleaning. In response, this research proposes an innovative solution leveraging Arduino, high-pressure water nozzles, and electronic components to revolutionize maintenance procedures. By automating cleaning processes, this system aims to reduce both the time required for servicing and the physical exertion demanded from workers while also minimizing water wastage and eliminating exposure to harmful chemicals. This study comprehensively evaluates the effectiveness of this technological intervention against conventional methods, highlighting its potential to not only optimize maintenance efficiency but also enhance worker safety and well-being.

Abstract: In the summer, the cars are exposed to strong sun when it is parked outdoor without the sunscreen, it has had accelerated the auto parts, interior aging and damage. In order to prevent that exposure, the solutions showed such as car awning, car sunshade and car sunscreen etc…, the above devices showed low effectivity for car sun protection. This paper will study effects of cooling system for outdoor sparking car using solar panels cover. A new covering car with multi-layers structure attaching flexible solar panels were designed to increase effectively sun protection, the nitrile rubber foam divided the light and heat radiation of the sun, the flexible solar panel converted solar energy into electric energy and supplied for the air conditioner to regulate inside car temperature. The results showed that, at nitrile rubber foam layer thickness of 4mm, the car maximum temperature of 41.5°C was observed for solar panel-awning-nitrile rubber cover which is much lower than it is exposed directly by sun radiation and commercial cover. The six solar panels (100W) were adapted on car cover, the solar electric energy supplied enough for a mini air conditioner of 340W. Performance of cooling system using solar panels was also investigated and it showed that the temperature inside car could be down to 24°C.

Abstract: Centralized air conditioning systems are widely used in buildings at present. In these conditioners, the outside air gets required temperature, humidity, purity, and other features, necessary for creating comfort microclimate in inside areas of houses, and by the help of fans and air ducts the processed air moves to all rooms of a building. As a result, the creation and maintenance of comfort conditions in buildings become complicated and expensive activity. From this point of view, it is becoming more expedient to install local air conditioners in each room instead of single central one for the whole building. For this reason new local air conditioner is developed.

Abstract: The comfort of a workspace for some people is a thing which is not negotiable. It is believed to raise the motivation of people who work in it. A room which is too hot or too cold may cause people working in it unable to concentrate in a manner that their work performance will not be optimal or will cause some of their work delayed and eventually lead to the depression of the workers themselves. From an economic standpoint, this analysis is important because the greater the capacity of the air conditioning system, the greater the power consumption. The purpose of this study is to determine the amount of heat, which is caused by external and internal factors, that arise in the Engineering building at Engineering Academy of Soroako, and to determine the proper capacity of air conditioners which should be installed in the building. To determine the amount of air conditioning capacity needed in the building, an analysis of the cooling load that occurs in the building is necessary. Geographical position, direction of the wall, and building materials are very influential in the absorption of heat from the outside, while the activities of the occupants, lighting loads, and loads of other electrical equipment affects the amount of heat that arise. CLTD / CLF / SCL methods are used in the calculation, and the data required is measured at the peak of the dry season, which occurs in October. Our analysis and calculations obtained that, according to its function, the number of lamps needed in the building are 26 type PL lamps with a power of 23 watts per lamp. The conduction heat gains and maximum daily infiltration occurred at 2pm with a value of 7.51 kW and 1.98 kW, respectively, while the internal heat gains and maximum daily radiation occurred at 3pm with a value of 1.94 kW and 15.41 kW, respectively. It is concluded that the total maximum daily heat gains that arises is 26.50 kW so the capacity of the air conditioner needed is 6.61 kW or rounded to 8.9 PK.

Abstract: This paper presents a numerical approach to determine the exergy loss in an air conditioner using (A/C) R22 and R290 as working fluid. The exergy loss should be minimized in order to increase the performance of the air conditioner. The present study investigates the A/C with cooling capacity of 2.4 kW. The results show that the total exergy loss of R290 is lower than that of R222, viz. 0.667 and 0.857 kW, respectively. This indicates that the use of R290 in the air conditioner using ejector as expansion device will generate a better COP improvement than that of R22. In addition, energy analysis shows that the COP improvements using R290 is higher than that of R22, for instance, 12.24 and 8.15% for R290 and R22, respectively, at the ambient temperature of 35°C.

Abstract: Air conditioners are one of the highest power consuming devices in houses or industrial buildings. Most buildings require air conditioner to make offices, classrooms, public areas or rooms to meet the required thermal comfort. Split unit type air conditioners are widely used in Negara Brunei Darussalam and other ASEAN countries. Currently, prescheduled controllers for split-unit air conditioners are not available in the market. In order to reduce air conditioner power consumption, study have been done to measured energy saving by controlling air conditioning using prescheduled controller that designed which is suitable for fixed operation hours example offices, schools, shops and others. Result showed that average percentage of power saving using a prescheduled controller can be as high as 40%.

Abstract: Paint workshop energy consumption cost is always the prominent part in the production and manufacturing. How to achieve the purpose of saving energy, improving economic efficiency has been the focus of the industry. The principle, characteristics and application prospect of energy management for the automotive paint workshop are illustrated. Combined with the practical application in painting process and paint equipment, energy saving techniques regarding to the paint assembly is analyzed.

Abstract: Air conditioning system consumes approximately 50% of the total energy consumption of buildings. Split-type air conditioner is the most widely used in residential and commercial buildings. As a result, enhancement on the performance of the air conditioners will yield a significant energy savings. The use of ejector as an expansion device on the split-type air conditioners is one method to increase the system performance. Exergy analysis on a split-type air conditioner uses an ejector as an expansion device at room and outdoor temperatures of 24 °C and 34 °C, respectively, yielded the percentage of exergy reduction up to 40.6%. Also, the exergy losses on in the compressor had the highest impact on the performance improvement of the split-type air conditioner.

Abstract: Energy crisis are deepening with every year passing by in a country like Pakistan. One of the major contributors of energy consumption in the domestic as well as in some commercial sector is the environment air conditioning (during summers) and heating systems (during winters). One possible solution to this national energy crisis is available in the form of tapping the available renewable natural resources of energy, specifically the Ground Water Heat Pumps (GWHP). Despite its wider applications in the advanced countries, the confidence in this technology is much feeble in less advanced countries, like Pakistan, mainly due to lack of awareness about the technology among the public and lack of subsoil temperature data for the scientific / engineering community. Thus, the aim of this study is to collect subsoil water temperature data of at least one particular location for over a year, and demonstrate the usefulness of sub soil ground water in improving the performance of conventional air-conditioning system both in cooling as well as in heating modes. This study shows significant improvement in the Coefficient of Performance (COP) of the Air Conditioner both in Cooling as well as in heating modes and thus reducing the expensive electricity consumption.

Abstract: The present study describes thermodynamic modeling of a novel cycle of ejector as an expansion device - called modified ejector cycle (MEC) - on residential air conditioner (A/C) to further enhance the COP improvement on standard ejector cycle (SEC). The difference between the SEC and MEC is the separator, namely the SEC uses a separator that has an inlet and two outlets, whereas in modified ejector cycle (MEC), the separator has only an inlet and an outlet in the system. Due to its environmental friendliness of R290 (propane), it is used to replace R22 as a working fluid in the numerical. The modeling results on the residential air conditioner with cooling capacity of 2.5 kW using R290 as working fluid showed that the COP improvement of the MEC was 42.86% at the condenser temperature of 45°C.