air conditioning refrigerant r134a has value of global warming potential (gwp) 1300, which is much higher than mac directive (gwp below 150) passed in july 2006. this prompted a search for alternative refrigerant with gwp value less than 150. r1234yf is a new refrigerant which has lower gwp value of 4. effect of blower speed has been compared and flammability issue of r1234yf has been addressed...

With commercial supercomputers and homogeneous clusters of PCs, static load balancing is accomplished by assigning equal tasks to each processor. With heterogeneous clusters, system designers have the option of adding newer hardware that is more powerful than existing hardware. When this is done, assignment of equal tasks to each processor yields suboptimal performance. This research addresses ...

Abstract. This paper proposes the three-level boost converter for highefficiency photovoltaic power conditioning system. Different from the existing two-level high boost converter, it has the advantage of high voltage gain and thus it is easy to make a high voltage from a low voltage. The proposed threelevel boost converter reduces the reverse recovery losses of the diodes and increases the ove...

In this paper, A power factor correction (PFC) based single ended primary inductor converter (SEPIC) is used to regulate DC bus voltage of voltage source inverter (VSI) to run PMBLDC motor . Permanent magnet brushless DC motor (PMBLDCM) is used in air-conditioning systems and runs at rated torque and variable speed to achieve energy conservation. The analysis, design and performance of the prop...

This paper reports a new functional design and modeling of a vibration energy harvester composed from a mechanical resonator (MEMS), capacitive transducer and a conditioning circuit based on the BUCK DCDC converter architecture. The basic configuration of conditioning circuit from [1][2] is enhanced with two major features for the power management allowing, firstly, to adapt dynamically to the ...

Air conditioning refrigerant R134a has value of global warming potential (GWP) 1300, which is much higher than MAC Directive (GWP below 150) passed in July 2006. This prompted a search for alternative refrigerant with GWP value less than 150. R1234yf is a new refrigerant which has lower GWP value of 4. Effect of blower speed has been compared and flammability issue of R1234yf has been addre...

The current U.S. electrical power grid is an out-of-date infrastructure, and the Smart Grid is an upgrade that will add many new functionalities to meet customers’ new power requirements. Updating a system as complex as the electrical power grid has the potential of introducing new security vulnerabilities into the system. This document presents a review of the work related to Smart Grid cyber ...

This paper presents an optimal dispatch model of an ice storage air-conditioning system for participants to quickly and accurately perform energy saving and demand response, and to avoid the over contact with electricity price peak. The schedule planning for an ice storage air-conditioning system of demand response is mainly to transfer energy consumption from the peak load to the partial-peak ...