Civil Engineering Reference
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the design problem. Initial data refers to (a) the residence building features, (b) the
customer needs and requirements, (c) the residence functional needs, and (d) the
residence energetic environment.
3.1 Residence Building Features
The data, which must be collected, refer to those geometrical and functional
characteristics of the residence, which in
uence its energy consumption. These are
the following: (a) the residence location expressed by latitude and longitude and the
location of the residence (building) within the built-up area of the city or not, and
(b) information about the characteristic elements of the architecture such as:
ground
floor area (GFA) and total
oor area (TFA);
exterior wall structure, surface, and material;
windows surface, type, orientation, and structure;
heated surface;
heated space average height;
perimeter;
height state of the residence, and building shading.
3.2 Customer Needs and Requirements
In designing a mCCHP system, regardless of whether it is carried out according to
open-ended or closed-ended approach, the customer needs and requirements must
be known in as much detail as possible, since they decisively in
uence the solutions
that the designer adopts during the designing process. The customer needs and
requirements mainly refer to the functions of the residence, to the space taken by the
mCCHP system, and to the costs related to system purchase and operation. Due to
various reasons, it is dif
cult to formulate these needs and requirements precisely
enough from the very beginning. That is why, if the open-ended approach is used, it
is possible for certain decisions to be taken by customer with the support of
designer so that an optimum compliance between the customer and the designed
system should be attained.
3.3 Residence Functional Needs
Energy is used in buildings for various purposes as heating and cooling, ventilation,
lighting, and preparation of domestic hot water.
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