Gas engine driven heat pump (GHP) is the heat pump air-conditioning system which drives compressors by the gas engine. GHP is the high efficiency, low electric power consumption, and low running cost air-conditioning system. It is widely spread mainly in Japan, where more than 600,000 units have been installed so far. Since release of GHP in 1985, we have been improving performance of GHP year after year. We have developed high efficiency gas engines, compressors, heat exchangers, and so on to improve its efficiency. The latest GHP series called "GHP XAIR" released in 2011 have top class APF (Annual performance factor) among big capacity VRF (Variable refrigerant flow) air-conditioners including electric heat pump ( EHP) . On the other hand, VRF air-conditioners including GHP are generally not optimized for different usages enough because it is difficult to operate optimally the outdoor-unit which has multiple indoor-units used in different conditions. Recently social needs for energy saving and visualization of energy consumption for air-conditioning become greater and greater. We developed the intelligent remote monitoring system for GHP which can optimize operation of GHPs to much various usages and reduce energy consumption remotely in order to meets these social needs. It has various functions to reduce energy consumption including "Energy-Saving Operation"," Scheduling Management", "Daily Reporting", and so on. "Energy-Saving Operation" enhances operational efficiency of GHPs by optimizing engine speed and temperature of supply air for usage environment. For example, in cooling mode, it slows down engine speed of GHPs when indoor temperature is in comfortable range to reduce energy consumption." Scheduling Management" can schedule start-stop, operation mode (Cooling or Heating), temperature setting, air volume, and so on. Additionally, it can automatically set back the temperature settings when they are changed by users and turn off GHPs when users forget to turn off them. It decreases waste of energy even if GHPs are used wasteful manner by various users. "Daily Reporting" is the function that provides operating condition and energy consumption data on a day-to-day basis through Internet. It can help facility managers to find useless operations and make operations more efficient. We tested this intelligent remote monitoring system at various buildings (offices, stores, fitness studios, and so on) in Japan. As a result, it was proven that it can reduce the energy consumption of GHPs by an average of about 20% a year without degradation of the comfortableness.
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