Add cruise gCO2 calculator

README.md

@@ -10,6 +10,7 @@ The following modes of transportation have carbon models to calculate a passenge
 * 🚌  [carbon_bus.py](https://github.com/J0ANMM/carbon-calculator/blob/master/carbon_bus.py)
 * 🚗  [carbon_car.py](https://github.com/J0ANMM/carbon-calculator/blob/master/carbon_car.py)
 * 🚢  [carbon_ferry.py](https://github.com/J0ANMM/carbon-calculator/blob/master/carbon_ferry.py)
+* 🛳️  [carbon_cruise.py](https://github.com/J0ANMM/carbon-calculator/blob/master/carbon_cruise.py)
 
 
 ## Coding or debugging

carbon_cruise.py

@@ -0,0 +1,59 @@
+"carbon_cruise.py calculates the emissions of passengers travelling on a cruise"
+
+try:
+    from carbon import Carbon
+except ImportError:
+    from results.carbon_calculator_git.carbon import Carbon #complete path inside Django project needed to make it work in Django Framework
+
+
+class CarbonCruise(Carbon):
+    """Class to calculate CO2 emmissions in cruises."""
+
+    def __init__(self):
+        self.avg_speed_kmh = 40 #based on the information on this page: https://www.cruisemapper.com/wiki/762-cruise-ship-cruising-speed
+
+
+    def calculate_co2(self, dist_km, trip_type):
+        """Calculate the CO2 eq emission of a ride by cruise."""
+
+        pax_qty = 1 #possibility to expand to more than one person per trip for future calculations. Additional emissions due to vehicle would be divided by number of travellers
+
+        cruise_co2_dict = self.cruise_co2_dict_from_json()
+        g_co2_foot_pax = cruise_co2_dict['footPax']
+        g_co2_km = g_co2_foot_pax * pax_qty
+
+        gr_co2_person = int(dist_km * g_co2_km)
+
+        if trip_type == "round-trip":
+            gr_co2_person = gr_co2_person*2
+
+        return int(gr_co2_person)
+
+
+    def calculate_co2_from_duration(self, duration_in_days, trip_type):
+        """Calculate the CO2 eq emission of a ride by cruise, given a duration as input."""
+
+        dist_km = self.estimate_distance_from_duration(duration_in_days)
+        gr_co2_person = self.calculate_co2(dist_km, trip_type)
+
+        return int(gr_co2_person)
+
+
+    def cruise_co2_dict_from_json(self):
+        """Return a dictionary with the data for cruises from a given source."""
+
+        relative_path = '/sources/cruise_emissions.json'
+        cruise_emissions_dict = self.dict_from_json(relative_path)
+
+        co2_dict = cruise_emissions_dict["gCO2"]["cruise"]
+
+        return co2_dict
+
+
+    def estimate_distance_from_duration(self, duration_in_days):
+        """Given duration as input, estimate distance covered."""
+
+        avg_speed_kmh = self.avg_speed_kmh
+        dist_km = int(duration_in_days * avg_speed_kmh * 24)
+
+        return dist_km

carbon_ferry.py

@@ -56,10 +56,10 @@ def ferry_co2_dict_from_json(self):
         return co2_dict
 
 
-    def estimate_distance_from_duration(self, duration_in_minutes):
+    def estimate_distance_from_duration(self, duration_in_days):
         """Given duration as input, estimate distance covered."""
 
         avg_speed_kmh = self.avg_speed_kmh
-        dist_km = int(duration_in_minutes * avg_speed_kmh/60)
+        dist_km = int(duration_in_days * avg_speed_kmh/60)
 
         return dist_km

sources/cruise_emissions.json

@@ -0,0 +1,14 @@
+{
+  "comment": "Grams of CO2 / pkm (passenger kilometer) for cruises",
+  "year": 2018,
+  "sources": {
+    "formula": "https://www.nyteknik.se/tekniknyheter/article6940738.ece/BINARY/Rapport%20om%20koldioxidutsl%C3%A4pp%20fr%C3%A5n%20kryssningsfartyg.pdf",
+    "averagePax": "https://www.cruisemapper.com/wiki/761-cruise-ship-passenger-capacity-ratings"
+  },
+  "gCO2": {
+    "cruise": {
+      "footPax": 207,
+      "comments": "assuming the average PAX is 3000 (based on the source), using the formula 2112 * (3000^-0.29)"
+    }
+  }
+}

tester.py

@@ -9,6 +9,7 @@
 from carbon_bus import CarbonBus
 from carbon_car import CarbonCar
 from carbon_ferry import CarbonFerry
+from carbon_cruise import CarbonCruise
 
 
 class CarbonCalculatorTester(object):
@@ -36,6 +37,23 @@ def compare_flight_ferry(self):
         print()
 
 
+    def compare_cruise_ferry(self):
+        """"""
+
+        dist_km = 400
+        trip_type = "round-trip"
+
+        co2_cruise = CarbonCruise().calculate_co2(dist_km, trip_type)
+
+        vehicle_ferry = "without-vehicle"
+        co2_ferry = CarbonFerry().calculate_co2(dist_km, vehicle_ferry, trip_type)
+
+        print("---- Travel CRUISE vs FERRY", dist_km, " km ", trip_type, "passenger ----")
+        print("Carbon footprint by cruise: ", co2_cruise, "gCO2")
+        print("Carbon footprint by ferry ", vehicle_ferry, ": ", co2_ferry, "gCO2")
+        print()
+
+
     def compare_flight_train(self):
         """"""
 
@@ -126,6 +144,7 @@ def compare_cars(self):
     cct = CarbonCalculatorTester()
 
     cct.compare_flight_ferry()
+    cct.compare_cruise_ferry()
     cct.compare_flight_train()
     cct.compare_trains()
     cct.compare_train_bus_car()