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updated formula variables to distinguish TiR from ToR #398

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updated formula variables to distinguish TiR from ToR #398

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32 changes: 16 additions & 16 deletions case-studies/eshoppen.md
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Expand Up @@ -90,23 +90,23 @@ P[kwH] = (Power consumed by CPU or Pc Number of cores + Power consumed by Memory

### Embodied Carbon (`M`)

The equation to calculate `M = TE * (TR/EL) * (RR/TR)`
The equation to calculate `M = TE * (TiR/EL) * (RR/ToR)`

Where:

* TE = Total Embodied Emissions, the sum of LCA emissions for all hardware components associated with the application server.
* TR = Time Reserved, the length of time the hardware is reserved for use by the software.
* TiR = Time Reserved, the length of time the hardware is reserved for use by the software.
* EL = Expected Lifespan, the anticipated time that the equipment will be installed.
* RR = Resources Reserved, the number of resources reserved for use by the software.
* TR = Total Resources, the total number of resources available.
* ToR = Total Resources, the total number of resources available.

For this component:

* TE: We will source the embodied carbon estimates for the servers from the [Cloud Carbon Footprint Coefficient](https://github.com/cloud-carbon-footprint/cloud-carbon-coefficients/blob/main/output/coefficients-azure-embodied.csv) Data Set.
* TR: 1 hr.
* TiR: 1 hr.
* EL: We will assume a 4 year lifespan or 35,040 hrs.
* RR: A virtual machine with 2 vCPUs was used, this data was sourced from [Cloud Carbon Footprint Azure Instances Coefficients](https://github.com/cloud-carbon-footprint/cloud-carbon-coefficients/blob/main/data/azure-instances.csv).
* TR: The bare metal host is split up into 16 vCPUs in total. This data was sourced from the [Cloud Carbon Footprint Azure Instances Coefficients](https://github.com/cloud-carbon-footprint/cloud-carbon-coefficients/blob/main/data/azure-instances.csv).
* ToR: The bare metal host is split up into 16 vCPUs in total. This data was sourced from the [Cloud Carbon Footprint Azure Instances Coefficients](https://github.com/cloud-carbon-footprint/cloud-carbon-coefficients/blob/main/data/azure-instances.csv).

### Database server for Web application

Expand Down Expand Up @@ -135,23 +135,23 @@ P[kwH] = (Power consumed by CPU or Pc Number of cores + Power consumed by Memory

### Embodied Carbon (`M`)

The equation to calculate `M = TE * (TR/EL) * (RR/TR)`
The equation to calculate `M = TE * (TiR/EL) * (RR/ToR)`

Where:

* TE = Total Embodied Emissions, the sum of LCA emissions for all hardware components associated with the database server.
* TR = Time Reserved, the length of time the hardware is reserved for use by the software.
* TiR = Time Reserved, the length of time the hardware is reserved for use by the software.
* EL = Expected Lifespan, the anticipated time that the equipment will be installed.
* RR = Resources Reserved, the number of resources reserved for use by the software.
* TR = Total Resources, the total number of resources available.
* ToR = Total Resources, the total number of resources available.

For this component:

* TE: We will source the embodied carbon estimates for the servers from the [Cloud Carbon Footprint Coefficient](https://github.com/cloud-carbon-footprint/cloud-carbon-coefficients/blob/main/output/coefficients-azure-embodied.csv) Data Set.
* TR: 1 hr.
* TiR: 1 hr.
* EL: We will assume a 4 year lifespan or 35,040 hrs.
* RR: A virtual machine with 2 vCPUs was used, this data was sourced from [Cloud Carbon Footprint Azure Instances Coefficients](https://github.com/cloud-carbon-footprint/cloud-carbon-coefficients/blob/main/data/azure-instances.csv).
* TR: The bare metal host is split up into 16 vCPUs in total. This data was sourced from the [Cloud Carbon Footprint Azure Instances Coefficients](https://github.com/cloud-carbon-footprint/cloud-carbon-coefficients/blob/main/data/azure-instances.csv).
* ToR: The bare metal host is split up into 16 vCPUs in total. This data was sourced from the [Cloud Carbon Footprint Azure Instances Coefficients](https://github.com/cloud-carbon-footprint/cloud-carbon-coefficients/blob/main/data/azure-instances.csv).

## (Quantify) SCI Value Calculation

Expand Down Expand Up @@ -185,13 +185,13 @@ I = **951 gCO2e/kWh**

### Embodied Carbon (`M`)

`M = TE * (TR/EL) * (RR/TR)`
`M = TE * (TiR/EL) * (RR/ToR)`

- TE = 1205.52 kgCo2e
- TR = 1 hour
- TiR = 1 hour
- EL = 35040
- RR = 2
- TR = 16
- ToR = 16

M = 1205.52 * (1/35040) * (2/16) = 0.004305 KG =~ **4.305 gCO2e**

Expand Down Expand Up @@ -227,13 +227,13 @@ I = **951 gCO2e/kWh**

### Embodied Carbon (`M`)

`M = TE * (TR/EL) * (RR/TR)`
`M = TE * (TiR/EL) * (RR/ToR)`

- TE = 1433.12 kgCo2e
- TR = 1 hour
- TiR = 1 hour
- EL = 35040
- RR = 2
- TR = 16
- ToR = 16

M = 1433.12 * (1/35040) * (2/16) = 0.005112 KG =~ **5.112 gCO2e**

Expand Down