Functional Block Diagram F.1 Global VIllage People

Diagrams

 * Diagrams are still to be done for this item.

Description
This diagram shows all the people connected to a village system. It includes both working and non-working since the latter use resources generated by other parts of the system such as food and housing. The total number of desired people can be set as a design input for the rest of the system. The number of required people is then an output based on the system design.

The labor part of the people is determined from the labor requirements of the equipment and facilities functions, plus surplus labor and overhead. Surplus labor is used outside the system. For example, if extra cash is needed to buy parts and materials, an outside paid job would count as surplus labor. Overhead is labor indirectly needed besides direct equipment and facilities labor. Examples include training staff and labor scheduling.

Labor is divided by skill, such as welding or tractor operator. Missing skills show a need to add people or perform training. Extra skills among the set of people is needed since use of a given skill is not always constant, and people sometimes cannot work when expected. Extra skills could be provided from outside the system as needed.


 * Assumptions


 * For estimating purposes one full time person supplies 8 hours labor per day at 240 days per year. For analysis purposes this value can be varied up or down to see how it affects the overall system model.


 * For estimating, the non-working part of the people is assumed to be 1.2 times the working part. This is based on the United States ratio of total population to employed population.  This value can also be stated as 45.5% of the total people are working.  For analysis, this ratio can be varied up or down to see how it affects the results.


 * For the purpose of concept development and system sizing the number of people is assumed to be 2, 10, 50, 250, or 1250. A real project will have variable numbers of people, but for developing all the other parts of the system, some specific sizes to work with ensure a consistent design.


 * Derived Requirements

Setting one requirement, such as number of people, in turn imposes requirements on the other parts of the Village system. Once identified, these requirements need to be applied to specific functions to execute.

Human inputs and outputs can be divided into necessary (air, food, water, shelter) and desirable. The following is a list of flows and their descriptions (still in work)

Food - A rough number of 2400 food Calories (kcal) per person are needed. More detailed numbers by age, sex, and level of activity can be found at |US Dept HHS Food Balance. Besides total calorie count, specific amounts of protein, carbohydrate, fat, and other nutrients are required as minimums to live, or desired for healthy balance. A diet is defined as the specific mix of foods to meet the calorie and component needs. Some or all of the diet can be met by the Village system, and the rest obtained from outside. Providing food is imposed on the F.4 Facilities.

Drinking Water - The US reference daily input is 3.2 liters/day/person, including water contained in food and drink. Whatever portion is not in food or drink needs to be supplied as purified water. Additional water is used for cooking, cleaning, washing, showering, gardening, etc and may or may not be purified to the same level as drinking water.

Sanitation - Humans produce primarily urine and feces as bodily wastes. These must be stored, transported, recycled, or disposed of safely.

Shelter - Most parts of the world require protection from the natural environment by controlling temperature, sun exposure, wind, rain and dampness exposure, environmental hazards such as lightning, flooding, and earthquakes, insects, animals, etc. Varying levels of control are needed for living areas vs work and storage areas for the people, the buildings, and their contents. Detailed requirements are specified in building codes.

Links to Related Diagrams
Higher Level: {To be done)

Inputs: (To be done)

Outputs: (To be done)

Controls: (To be done)

Mechanisms: (To be done)