Economic and environmental value stream map (E²VSM) simulation for multi-product manufacturing systems

Figures & data

Figure 1. Development of VSM approaches.

Figure 2. Structure of E²VSM methodology.

Figure 3. Unit process module.

Figure 4. Information flow and logic for the product routing and job allocation in the E²VSM model.

Figure 5. Product routing of the simulated case.

Table 1. Model input for the mixing processes.

Resources	Product-specific paramaters			Machine-specific parameters
	Product type	Lot size (qty)	Production time / lot (min)	Set-up time (min)	Production power (kW)	Standby power (kW)	Scrap rate (%)	MTTR (min)	MTBF (min)
MX1	A	26	21	300	5.56	0.22	1	100	2000
	B	222	40
MX2	C	170	14	300	22.3	0.12	2	100	2000
	F	192	33
MX3	D	143	32	300	9.71	0.05	1	100	2000
	E	81	32

Figure 6. Actual daily electricity consumption of the case factory in comparison with simulation results.

Table 2. Simulation results for six products (VA: value adding; NVA: non-value adding).

Product	A		B		C		D		E		F
	VA	NVA	VA	NVA	VA	NVA	VA	NVA	VA	NVA	VA	NVA
Batch size	26		222		170		173		81		192
Time (min)	288	553	1333	10130	669	3340	938	5858	1216	6406	722	12401
Electricity (kWh)	98	956	233	600	195	406	153	361	259	595	129	480
Gas (kWh)			1749	88	640	28	1307	49	1464	96	641	103
Emissions el (kg-Co2 eg)	86	516	205	528	172	357	135	317	228	524	114	422
Emissions gas (kg-Co2 eg)			322	16	118	5	240	9	270	18	118	19
Energy cons.total (kWh)	684		2670		1269		1870		2414		1353
Energy cons.part (kWh/p)	26		12		7		13		30		7
Energy cost.part($/p)	3.94		1.05		0.77		0.93		1.30		0.79

Figure 7. Exemplary E²VSM of product type B.

Figure 8. Result of machine choice on various performance indicators.