Via GCC, first I recall reading of anything using LN2:
http://www.greencarcongress.com/2017/05 ... power.html
First liquid nitrogen hybrid bus completes trials; HORIBA MIRA and Dearman
A hybrid bus that runs on both diesel and liquid nitrogen has completed a series of trials to bring it one step closer to the road. The hybrid bus—CE Power—is the first to be powered by liquid nitrogen and has been built by engineers at HORIBA MIRA as part of an Innovate UK consortium.
The bus utilizes alternative propulsion to address urban air pollution challenges and features a high-efficiency, zero-emission Dearman Engine (earlier post), powered by liquid nitrogen, alongside a conventional diesel engine. . . .
The bus uses a hybrid propulsion system to reduce emissions during acceleration after stopping. This portion of the bus’ drive cycle traditionally has a heavy impact on the diesel engine and can produce large amounts of NOx and CO2 emissions. As the Dearman Engine produces none of these harmful emissions, it will enable the bus to continue to stop frequently to unload and pull away from a bus stop without expelling the same level of damaging pollutants.
While driving at 20 mph or below, the liquid nitrogen—stored in a low pressure insulated cylinder—is warmed up to the point of boiling, at which time it creates enough pressure to drive the multi-cylinder Dearman engine. Once the bus reaches 20 mph, the diesel engine will kick in as at this speed the bus requires less effort from the engine to operate. . . .
The benefits of using liquid nitrogen over an electric hybrid bus include a much longer life, local production and easy refueling. Batteries, which power many of the UK’s electric hybrids, require changing several times over the course of a bus’s lifetime, whereas the liquid nitrogen system will last the lifetime of the bus, Dearman said. Liquid nitrogen can be produced locally without the need for neodymium or lithium, which are both used by motors and batteries and sourced from overseas. Furthermore, refueling liquid nitrogen can take a matter of minutes, enabling the bus to return to the road in a short timeframe. . . .
http://www.greencarcongress.com/2017/05 ... -jive.html
Bus operators launch joint procurement for 63 fuel cell buses in Germany and South Tyrol; part of JIVE
Wuppertal-based WSW mobil GmbH last week tendered the procurement of 63 fuel cell buses for operation in public transport. WSW is coordinating the joint procurement for its partners Verkehrs-Verbund Mainz-Wiesbaden GmbH; traffiQ Frankfurt; Regionalverkehr Köln GmbH (all Germany); and SASA SpA-AG in Bolzano (Itay) which are going to operate these buses in the next years. The coordinated procurement of buses based on a joint specification sheet targets achieving lower prices for the buses.
The joint procurement activity is part of the JIVE (Joint Initiative for hydrogen Vehicles across Europe) project, an EU-funded project deploying 139 new zero emission fuel cell buses across nine cities, the first deployment of this scale in Europe. (Earlier post.) JIVE is going to become the largest fuel cell bus project in Europe. . . .
The transport operators are part of a fuel cell bus procurement cluster which currently comprises 15 companies in Germany, South Tyrol and Trento. Their common target is to switch their complete bus fleets to emission-free vehicles in the future. . . .
Further clusters exist in the UK, Benelux, France, Scandinavia and Eastern Europe.
The necessary hydrogen is either a by-product from the local chemical industry or is made by electrolysis from renewable electricity.