R22 and R410A split air-conditioning systems were tested and compared as outdoor temperature ranged from 27.8 °C (82.0 °F) to 54.4 °F (130 °F). The R410A system tests were extended to 68.3 °C (155.0 °F) ambient temperature with a customized compressor. Capacity and efficiency of both systems decreased linearly with increasing outdoor temperature, but the R410A system performance degraded more t...

Refrigerant compressors can be a primary noise source in residential air conditioning and heat pump systems. When evaluating the contribution of a compressor to the total noise, it is necessary to consider how the compressor couples to the condensing unit. Compressors typically couple to the condensing unit via three different types of noise paths. First, the compressor couples structurally to ...

The article investigates the effect of compressor pressure ratio, turbine inlet temperature and ambient temperature on the performance parameters of an air-cooled gas turbine cycle with evaporative cooling of inlet air. Air f ilm cooling has been adopted as the cooling technique for gas turbine blades. The mass of coolant required for turbine blade cooling is calculated f or a selected range of...

During hot seasons the inlet temperature of Nitrogen increases, as a result compressor consumes more power for compressing a specific mass ratio of fluid and consequently total energy consumption of the compressor increases as well. In this research, a three stage centrifugal compressor with intercooler was modeled thermodynamically in order to decreases the energy consumption of the compressor...

In the air-conditioner’s market, the users are particularly sensitive to the vibration and noise of the machine. Thus, the enterprise not only the air-conditioner manufactures but also the compressor manufactures cast about how to develop and design more quietly machine. In this paper, we analyzed various kinds of factors that influenced the vibration and noise of air-conditioner, and we give t...

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...

0957-4174/$ see front matter 2011 Elsevier Ltd. A doi:10.1016/j.eswa.2011.04.225 ⇑ Corresponding author. Tel.: +90 262 3032279; fax E-mail address: [email protected] (M. Hosoz) This paper investigates the applicability of adaptive neuro-fuzzy inference system (ANFIS) to predict the performance of an R134a vapor-compression refrigeration system using a cooling tower for heat rejection. For t...

A printed circuit heat exchanger (PCHE) is utilized to cool the compressor inlet air increase compression efficiency in a liquid energy storage and natural gas (LNG) coupled system, which can offer large-scale with significantly improved exergy round-trip efficiency. In this work, effect of pressure air, incline angle, hydraulic diameter on performance compressed air–water PCHE semicircle cross...

This paper compares the results from a study conducted at Iowa Energy Center’s Energy Resource Station with EnergyPlus simulation results. The building consists of controlled test rooms, dedicated air handling units and air-cooled chillers for the purpose of obtaining quality data suitable for empirical validation studies. Weather data were also collected at the facility and used for the simula...