Centrifugal chillers are mainly used as heat sources for factory air conditioning and district
heating and cooling system. As with residential air conditioners, the electricity costs account for a
large portion of their operating costs, so energy saving is important. However, it is not easy for
customers to correctly monitor the equipment status and improve energy efficiency on their own.
Furthermore, As the machine ages, it is more difficult to keep track of maintenance records, which
makes it even harder to perform effective maintenance. To solve these problems, Mitsubishi Heavy
Industries Thermal Systems, Ltd. (MTH) has launched a portal site which helps our customer s to
easily access to machine specifications, recommended maintenance plans and records, as well as
real time chiller operation status when necessary.
In addition, by integrating the portal site with the introduction of IoT to centrifugal chillers,
MTH have visualized energy efficiency and loss, and have started to provide solutions for realizing
data-based energy saving.
Inverters used for room air conditioners, which are household-use air conditioners, cause the outflow of harmonic current with a frequency other than the power supply frequency to the input current. This harmonic current is regulated and measures to meet the regulations are required and we have responded to the regulatory. On the other hand, if the waveform of the power supply voltage is distorted, the input current is distorted and the current increases and there are problems such as the deterioration of the efficiency and fuses blowout due to overcurrent in some cases. Therefore, Mitsubishi Heavy Industries Thermal Systems, Ltd. calculated the distortion factor of the input current and conducted control so as to reduce it. As a result, it was confirmed that the total distortion factor could be suppressed to 1/5 to 1/2 and reported.
The controllers of centrifugal chillers manufactured by Mitsubishi Heavy Industries Thermal Systems, Ltd. (MTH) are proprietary products of MTH. However, it was impossible to replace existing controllers with the latest ones due to the significant difference between old and new controllers and the difficulty in ensuring compatibility. Nevertheless, many centrifugal chillers that were released more than 10 years ago and are equipped with old controllers are still in service and they will continue to be used for a long time in the future. In order to reassure our customers that they can operate MTH centrifugal chillers for a long time without issue, we have developed a renovation controller with the latest features compatible with older controllers.
Today, it is recommended to raise the cooling temperature setting as a method of saving energy in building air conditioning. However, many air conditioners depend exclusively on dry-bulb temperature control and during the rainy season, their dehumidifying capacity for latent heat may be insufficient, resulting in discomfort. One of the causes of the latent heat load, which is a factor in this discomfort, is often the intake of outdoor air by ventilation. This time, we have commercialized a humidity control outdoor air processing direct expansion air handling system (Direct X Comfort), which has a cooling dehumidification function that controls the dew point temperature and a reheating function that utilizes waste heat, in addition to the functions of conventional outdoor air processing direct expansion air handling systems. By using waste heat from the heat pump as the heat source for reheating, this system has achieved a 60% reduction in power consumption compared to the conventional desiccant system that uses an electric heater as the heat source for regeneration.
Centrifugal chillers
Aquifer Thermal Energy Storage System of Low GWP Turbo Heat Pump Utilizing Unused Energy
Truck refrigeration unit
Engine-driven Refrigeration Unit TU series using Low GWP Refrigerant
Automotive air-conditioners
Low Vibration Electric Compressor for Air Conditioning System of Hybrid & Electric Vehicles
Compressor for air-conditioners
Sliding Surface Improvement Technology Using Low Friction Surface Treatment to Reduce Friction Loss and Improve Efficiency of Products
Heat exchanger
Development of Numerical Simulation Method for Evaluation of Gas-Liquid Two-Phase Flow Distribution
Centrifugal chillers
Development of Large Capacity Compound Type Centrifugal Chiller and Centrifugal Heat Pump Using R1234ze(E)
Centrifugal chillers
Optimization of Process Cooling for Food Using Variable Speed Centrifugal Chiller Operating at Ultra-Low Load with Low-GWP Refrigerant
Freezer and refrigeration unit
Development of HCCV2001M, the World's First Large-capacity Condensing Unit equipped with two CO2 Scroll and Rotary compressors
Residential air-conditioners
Development of Demonstration Unit of Residential Air Conditioner Adopting Low-GWP Refrigerant to Replace R32
Compressor
Development of Evolutionary Three-Dimensional Scroll Compressor Realizes Energy Saving in Air Conditioning and Refrigeration Equipment
Heat pump
Development of Japan’s First Air-source Circulation Type Heat Pump Using R454C
Automotive air-conditioners
Efforts to Acquire Automotive SPICE Certification in Automotive Software Development
Automotive air-conditioners
Development of Heat Pump System for xEVs
Air-conditioners for stores and offices
"Hyper Inverter" Compact and Lightweight Packaged Air Conditioner
Commercial air-conditioners
FDTC series 4-way Ceiling Cassette Compact Air-Conditioner featuring European Design
VRF
Remote Monitoring and Energy Saving of Air Conditioners M-ACCESS Air Conditioner IoT Remote Monitoring System
Truck refrigeration unit
Generator-driven Type Transportation Refrigeration Heat-Pump Unit for Trailers
Truck refrigeration unit
TE Series Small Electrically-driven Refrigeration Units with Generator for Delivery Trucks
Automotive air-conditioners
Large Capacity Electric Compressor for Air Conditioning System of Hybrid Electric Vehicles
Heat exchanger
Development of Numerical Evaluation Method for Unsteady or Phase-changing Gas-liquid Two-phase Flow