Dearman has set out to produce the first transport refrigeration system that’s engineered entirely without compromise. Utilising the ground-breaking, liquid nitrogen powered Dearman Engine, the Dearman system is being developed to offer industry leading performance, zero-emission and quiet operations, all without having to compromise on cost.
Where other systems force operators to make tough choices, Dearman will enable companies to enhance their sustainability, to address concerns about emissions and noise and to improve operational flexibility. Governments and local authorities have recognised the role that transportation and logistics play in issues of air quality and climate change. Dearman is working with operators to help them address these challenges, while maintaining the highest levels of performance and reliability.
Simple & Reliable
Dearman’s piston technology looks a lot like a diesel engine. It’s made out of conventional materials, like aluminium, and by established automotive suppliers. This allows it to be produced at lower cost, but with improved reliability. Dearman is also working with experts like Hubbard and Air Products to deliver efficient and reliable refrigeration and cryogenic systems.
Liquid nitrogen supply can be readily arranged and maintained by Air Products’ widespread network and filling takes minutes. The system operates from a digital controller, with in-cab controls, and comes with in-built Secure-Cold, allowing temperature to be maintained even in the unlikely event of a mechanical failure.
The Dearman transport refrigeration system incorporates the best of cryogenic refrigeration systems, coupled with a Dearman Engine for extra efficiency and a vapour compression refrigeration cycle for extra performance. The Dearman system can deliver rapid pull down rates and high cooling capacity, with maximum efficiency.
It is 50% more efficient in producing cooling compared to systems that rely on evaporation alone, and generates its own power to run ancillary systems. The result is a system that can be configured to meet customer requirements and that’s able to support even the most demanding duty cycles.
Contact a Dearman specialist now to speak about the Dearman Transport Refrigeration System
Dearman’s transport refrigeration system is zero-emission, with absolutely no NOx or PM. Replacing a conventional diesel powered refrigeration unit with a Dearman system can reduce a truck’s overall engine PM emissions by over 90% and NOx emissions by over 70%.
At the same time, Dearman’s high-efficiency system can deliver significant reductions in CO2 and prevent the need for vehicle idling.
The Dearman Engine is made of conventional materials, with nothing rare or exotic. The cooling power of liquid nitrogen also allows the vapour compression refrigeration system to be downsized significantly. As a result, the purchase or lease costs of a Dearman system can be kept in line with diesel equivalents.
The power generated by the Dearman Engine also delivers greater efficiency than simple cryogenic systems and reduced liquid nitrogen consumption. Innovative transport refrigeration doesn’t have to cost the earth.
Dearman’s transport refrigeration system is quiet. Studies have suggested that night time operation, with less congestion, can reduce fleet CO2 emissions by up to 30%.
The Dearman system will comply with tough night time noise standards, potentially allowing a fleet to operate more efficiently and effectively, without disturbing customers or breaching local regulations.
1. Liquid nitrogen is stored at ~3bar in a cryogenic vessel.
2. Liquid nitrogen is then pumped to ~40bar and transferred to a vaporising heat exchanger where it provides cooling for the chilled compartment. Approximately two thirds of the total cooling supplied comes from this source.
3. The cryogenic gas is fed into the Dearman Engine, where after being combined with heat exchange fluid it expands, producing shaft power, which is used to:
a. Support ancillary systems such as feed pumps, an alternator and fans for air circulation.
b. Drive the compressor of a vapour compression refrigeration cycle that provides additional cooling, a third of the total cooling supplied comes from this source.
4. The heat exchange fluid is then reclaimed and used to harvest heat from the condenser of the refrigeration cycle, which has the advantage of approximately doubling its efficiency.
5. The heat exchange fluid is re-used in the engine. The only emission back to the atmosphere is air or nitrogen.
In addition to significant reductions in NOx and particulate emissions, the Dearman transport refrigeration system results in substantial well-to-wheel CO2 savings. The operating costs are also lower than conventional refrigeration units.
The Dearman transport refrigeration system will be deployed with a commercial customer in 2016.
To support the delivery of Dearman technology to the market, the company has formed a significant partnership with Hubbard Products Ltd, the UK’s leading transport refrigeration unit integrator.
Discussing the potential of Dearman technology to transform the transport refrigeration industry, Pat Maughan, Managing Director of Hubbard Products Ltd said:
“Hubbard, after many years of refining design, has realised that near term future requirements cannot be achieved with existing available components and technologies. Hubbard has enthusiastically engaged with Dearman to jointly develop a transport refrigeration system that will be the paradigm shift to economic clean cold on the highway. We have reviewed the Dearman technology and concluded it has enormous potential to revolutionise both the emissions and costs inherent in refrigerated road transport.”