Energy‐Saving Technologies for Inverter Air Conditioners

Abstract

Almost all residential air conditioners in Japan are inverter air conditioners in which a permanent magnet synchronous motor (PMSM) is driven by a PWM inverter. The inverter technology can reduce the energy consumption to less than half that of air conditioners driven by a constant-speed induction motor (IM). This paper reviews the trends and the latest energy-efficient technologies for the motor and the power converter that achieve considerable energy saving. 

Dimensions of Green Office Evidence From Regency/City Government Offices in Central Java, Indonesia

“…The close observations of the offices during this study also indicated that some government offices were using ecofriendly air conditioning units or they may be using inverter technology which also has an impact on saving energy. In terms of the air conditioning unit with the inverter technology, it was noted that this technology has the potential of reducing energy consumption to less than half of those air conditioning units driven by the constant-speed induction motor (Ohyama and Kondo 2008). Through the presentation of these findings, it can be deduced that indicators of energy conservation dimensions in the green office include periodic energy audits, the application of energy-efficient lightings, buildings to deliver natural lightings, and regulations, rules, and instructions for technical equipment such as air conditioners, as a means of fulfilling the energy saving goals.…”

Operation of Hvac System for Energy Savings and Economic Analysis

“…These include the dimensions of the house, outdoor temperature, lights, the outdoor humidity, wind speed, the level of insulation in the house, the amount of air leakage in the house, the amount of southern, eastern, and western facing glass in the house, whether this glass is single, double, or triple glazed, and whether window treatments (curtains or blinds) are kept closed or open. Other factors include the amount of shading from trees, roof overhang, awnings, or buildings and how much heat is generated in the house by people during cooking, sleeping and some electric equipments inside the house that produce heat [19].…”

“…A better understanding of the VFD will lead to improved application and selection of both equipment and HVAC systems. A Variable Frequency Drive (VFD) is a type of adjustable speed drive used to control the speed of the motor based on the system load requirements and operation schedule, resulting in a dramatic cut in energy consumption [20]. VFD technology allows the air conditioner to automatically vary its power output to specifically maintain room temperature at a desired or comfortable level.…”

Models of Sub-Components and Validation for the IEA SHC Task 44 / HPP Annex 38

“…Alternatively to the above-mentioned isentropic efficiency model for the compressor, a polynomial equation fit for the compressor performance map using the same model as described for the heat pump performance in Afjei 1989 gives an equal good representation of the compressor characteristic. Ohyama et al 2008 gives an overview on the last year's development in capacity controlled scroll compressor technology. Especially the capacity controlled scroll compressors improved their performance due to development of enhanced electronic controlled interior permanent magnet motor technology.…”

“…In today's high efficiency capacity controlled compressor motors, the motor efficiency stays above 90% over the part-load operating range. Ohyama et al 2008Jin 2002and Brandemuehl et al 2009 conducted an extensive literature review on heat pump and chiller models and available manufacturer data. They further developed the found model descriptions and defined heat pump models based on a parameter identification methodology for the fit to catalogue data.…”