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Thermal Storage to Optimize Passenger Shuttle Cooling Systems Operating in Severe Conditions

Groupe Enerstat Inc.-Stéphane Bilodeau
Published 2005-11-01 by SAE International in United States
In severe - hot and humid - climates, Vehicles Air Conditioning Systems (AC systems) in use today suffers from a lack of performance and on a difficulty to efficiently meet the cooling load without causing a significant reduction in the performance of the internal combustion engine. This is especially true in applications where vehicles have long idling period and a lot of passengers, such as buses and passenger shuttles.An integrated cooling system has been implemented and tested in an Airport Passenger shuttle in order to improve fuel economy and cooling effectiveness in severe environment (up to 120 °F). The cooling system integrates a high-efficiency thermal storage technology (based on phase change materials) coupled to high performance compressors.Comprehensive performance analyses and testing of the high-performance system have highlighted many benefits of using the technology in such applications.This papers presents the system and shows the monitoring results (in terms of outside conditions and comfort conditions, effective capacity in operation, time to meet the load from start-up, reduction in energy consumption) of the implementation with monitored data in…
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Integrated Technology Based on Thermal Storage to Reduce Trucks Idling for Overnight Heating or Cooling

Groupe Enerstat Inc.-Stéphane Bilodeau
Published 2005-05-10 by SAE International in United States
Intercity tractor-trailers and other vehicles with diesel engines idle a significant portion of the time. Idling also produces airborne emissions and noise; a number of cities and states have banned or restricted idling to reduce pollution and noise. Reducing idling truck idling is thus an important environmental issue. In the freight transportation industry, a large part of the idling time is due to off-road heating and air conditioning. The heating ventilating and air conditioning systems (HVAC systems) in use today on internal combustion vehicles do not lend themselves to efficient application in vehicles having long idling period, especially in the trucks market.An integrated climate control system has been developed over the past seven years. Applying a high-efficiency thermal storage technology (based on phase change of specific materials), the Climate Control System has been implemented in long haul trucks to reduce idling (for “off road and off engine” heating and cooling). Comprehensive performance analysis and testing of the high-performance heat pump have highlighted many benefits of using the technology (improved fuel economy by reducing vehicle idle…
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The Novacab System to Reduce Energy Consumption for HVAC in Bus and Commercial Van Applications

Groupe Enerstat Inc.-Stéphane Bilodeau
Published 2004-10-26 by SAE International in United States
The heating ventilating and air conditioning systems (HVAC systems) in use today on internal combustion vehicles do not lend themselves to efficient application in vehicles having long idling period, especially in the buses and commercial vehicles market.An integrated climate control system has been developed by Groupe Enerstat over the past seven years. Applying a high-efficiency thermal storage technology (based on phase change of specific materials), the Novacab Climate Control System has been implemented in commercial trucks and buses to reduce idling (for “off road and off engine” heating and cooling). Comprehensive performance analyses and testing of the high-performance heat pump, but also a comparison with other systems have highlighted many benefits of using the technology (improved fuel economy by reducing vehicle idle and allowing for engine longer shut-off conditions).This article presents the system and shows the results (in terms of reduction in energy consumption and emissions) of the implementation with monitored on-road data in commercial truck applications.
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High Performance Climate Control for Alternative Fuel Vehicle

Groupe Énerstat inc.-Stéphane Bilodeau
Published 2001-05-14 by SAE International in United States
Conventional gasoline-powered automotive heating systems use the abundant coolant waste heat to achieve acceptable comfort. Engine thermal losses in alternative fuel vehicles (ULEVs, HEVs and EVs) are too small to meet the heating load. The mobile heating and air conditioning systems in use today on internal combustion vehicles do not lend themselves to efficient application in the Low Emission Vehicle market.A climate control system (including heating, cooling, ventilating and dehumidifying) has been developed by Groupe Énerstat inc. The Climate Control System has been designed from the ground up specifically for high efficiencies vehicles and it integrates a high performance hermetically sealed heat pump and a thermal storage unit. Energy regeneration allows for constant exchange of the cab's air and optimum air quality with efficient defogging and defrosting of windows without serious energy expenditure.Prototypes have been tested in a climate chamber (from -30°C to +30°C) and been installed in a small delivery van converted to electricity. The van has been operated with (and without) the system for comparison purposes. The testing we have performed indicates that…
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