STEM help / Data dialogs

Resource / Other Details

The items in this dialog allow you to make refinements to your model which, in certain cases, may have significant effects.

Label

The text used to identify an element in the Results program when selecting elements to draw on a graph and for labelling the subsequent graphs. If the Label is blank, the element name is used instead.

You can group a number of sensitivity parameters by giving them all the same Label. They will then be treated as a single group in the Results program.

There is also a global Label field which is just used within the Editor as an overall description for the model.

Default: none.

Pre-Run Installation

This group of entry cells allows you to set up the initial age profile of the resources which are already in the network when the model run begins. The way in which you do this affects the amount of old equipment coming up for replacement in each year of the model run.

Max. Age of Installed Units

The number of years for which a resource has been installed before the model run begins, which should not exceed the Physical Lifetime.

Note: pre-run installation needs to be enabled (Pre-Run Installation = Yes within the Data/Other Details dialog) for this input to work. This input is disregarded if the global input Pre-Run Installation = No.

Default: –1. A special value meaning one Physical Lifetime.

Installation Profile

The relative proportions of the units of a resource which are installed in each year of its pre-run installation. For example, use an Interpolated Series to specify units per year, or an Exponential Growth for increasing demand. The Normalise Profile input governs whether the Installation Profile should be scaled to match the actual number of units required in the first period of the model run, or whether it stipulates specific numbers of units to be installed for each of the pre-run years up to and including the first period of the model run.

Default: Constant {1.0}. Equal numbers of units of each age are installed.

Note: pre-run installation needs to be enabled (Pre-Run Installation = Yes) within the Data/Other details dialog for this input to work. This input is disregarded if the global input Pre-Run Installation = No.

Normalise Profile

A choice governing the interpretation of the Installation Profile input.

Yes: the Installation Profile is scaled to match the actual number of units required in the first period of the model run, guaranteeing that pre-run installation matches the initial demand.

No: the Installation Profile is taken at face value, stipulating specific numbers of units to be installed for each of the pre-run years up to and including the first period of the model run. This may cause the model engine to install additional slack capacity.

Default: Yes.

Note: pre-run installation needs to be enabled (Pre-Run Installation = Yes) within the Data/Other details dialog for this input to work. This input is disregarded if the global input Pre-Run Installation = No.

Ongoing Installation

Planned Units

A time series specifying a minimum total installation of a resource.

Default: Constant {0.0}.

Redundant Units

Decommissioning Mode

Default: Annual Proportion

Decommissioning Proportion

The proportion of any redundant units of a resource that are removed from the network each year. This can be used in conjunction with Churn Proportions to model early decommissioning.

Default: Constant {0.0}. Redundant units remain in the network.

Slack Equipment Bias

Use Slack

A choice governing how any slack capacity should be taken up when demand increases:

Even: slack capacity is taken up evenly across all installed ages of the resource.

Oldest: the oldest capacity is used first.

Newest: the newest capacity is used first.

Default: Even.

Make Slack

A choice governing how capacity should be made slack when either service demand falls or capacity is churned to another resource:

Even: capacity is made slack evenly across all installed ages of the resource.

Oldest: the oldest capacity is made slack first.

Newest: the newest capacity is made slack first.

Default: Even.

Churn Mode (1)

A choice of the way in which the costs of a resource are affected by churn:

Normal: a Churn Cost is generated for the Used Capacity of the resource, in proportion to the effective Churn Proportions of services and transformations using it.

Inflate Operations Cost: the Operations Cost for the resource is increased by the effective Churn Proportions of services and transformations using it. This is an alternative way to model the cost of churn.

Inflate Demand: demand for the resource is increased by the effective Churn Proportions of services and transformations using it (without affecting the Demand or Output of those services or transformations).

Note: Churn will only be modelled if the Churn Proportion is set to a number greater than 0.0 in the Service / Other Details dialog.

Default: Normal.

Switched Off

A choice governing whether a service, resource, transformation or function is excluded from the model, in order to study the effect of its removal.

No: the element is included in the model.

Yes: the element is excluded from the model.

Default: No.

 

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