Mixtures with higher levels of RBE are characterised by higher kinematic viscosity and density compared to mixtures with RME.
The results demonstrate that RME or RBE additives increase the oxygen content in the fuel, and the increase is more significant in the case RME than in the case of RBE.
This tendency can be explained by the poor lower heating value of both esters (the difference between RME and diesel was 12%, and the difference between RBE and diesel was 11%).
3) decreased in parallel to increasing concentrations of both esters in mixtures (RME and RBE, respectively) by up to 33%.
5), a decrease in emissions has been observed with both RME (up to 25%) and RBE (up to 38%) mixtures; this decrease can be explained by a more intense combustion process in the engine cylinder when the working mixture disperses in the combustion chamber more evenly.
Overall, benefits of RBE as implemented here were fairly inconsistent.
It is important to note that RBE was not introduced to these participants without potential additional influences on their behavior.
RBE as outlined by Weil (1998) may be more effective when practiced with another technique such as breath meditation.
Despite the mixed results reported, we do encourage future research in this area as some benefit was demonstrated within the limited time frame in which RBE was applied.