embrs is in development
embrs was initially written as part of work on a scoping exercise to provide early estimates of the environmental impacts of the diesel to electric bus transition published as Tivey et al 2023
embrs projects pages
You can install the development version of embrs from Github with:
# install.packages("devtools")
devtools::install_github("karlropkins/embrs")embrs uses vehicle and route objects to build emission models in the classic form:
[emissions] * [activity]
For example:
library(embrs)
# a EURO VI ICE diesel bus weighing 15925 kg
bus.1 <- bus_ice(name="E6DV", veh.wt=15925, euro.class="vi", eng.fuel="diesel")
# a 30 km/hr route
route.30 <- route_veh_spd(30)
# multiple them
mod <- bus.1 * route.30
# plot that
plot(mod)
Vehicles can also be added together to make fleets and these and routes can be multiplied to produce small-scale emission inventories or compare emissions on different routes.
For example:
# EURO VI diesel versus Battery Electric BUS comparison from Tivey et al (2023)
# a EURO VI ICE diesel bus weighing 15925 kg
bus.1 <- bus_ice(name="E6DV", veh.wt=15925, euro.class="VI", eng.fuel="diesel")
# a battery electric bus weighing 17725 kg (and conventional brakes)
bus.2 <- bus_bev(name="BEV", veh.wt=17725)
# like bus.2 but with regenerative brakes operating at 25% efficiency
bus.3 <- bus_bev(name="BEV\nlow", veh.wt=17725, brk.regen = 0.25)
# like bus.3 but 75% efficiency
bus.4 <- bus_bev(name="BEV\nhi", veh.wt=17725, brk.regen = 0.75)
# a small fleet
fleet <- bus.1 + bus.2 + bus.3 + bus.4
# some routes
routes <- route_naei_urban() + route_naei_rural() + route_naei_motorway()
# an inventory
inventory <- fleet * routes
# just plotting PM contributions by vehicle (bus.1 to 4)
plot(inventory, plot.type="by.vehicle", em.type="just.pm")
Contributions are very welcome. Please see both contribution guidance and code of conduct if interested in contributing.