1.6. Terminology and abbreviations applied in program and instruction<br>

## 1.6. Terminology and abbreviations applied in program and instruction

In this instruction following terminology has been applied:

· Total net heat loss of compartment ΦNetto: sum of heat loss by penetration and for ventilation in compartment

· Total reduced heat loss QZred/ΦZred: total heat loss taking into account heat gains from heating surfaces in compartment

· Partition definition: definition of thermal features by stating of building materials layers in partition. Partition can also be defined by stating the heat transfer coefficient “U” or thermal resistance “R” as well as by declaring the inhomogeneous partition.

· Storey: set of adjacent compartments having the same floor ordinate.

· Graphic storey: a storey being the set of compartments from one working sheet of Instal-therm program.

· Tabular storey: a storey entered or added in tabular editor of Instal-heat&energy program.

· Flat: set of compartments, for which some calculations of thermal calculations are given. That are flat area, heated flat area, cubic capacity of flat, heated cubic capacity of flat and average temperature of heated compartments.

· Main flat: flat chosen by the User as a representative among many others, being one multi-storey flat. Declaring of required parameters of internal environment in main flat brings about their assigning to entire multi-storey flat.

· Multi-storey flat: a flat including several storeys in a building.

· Sub-floor: one of constructional elements of lifted floor, including floor layers located under the sub-floor space. The sub-floor is a part of lifted floor being “below” in contact with the ground and “above” in contact with aerial sub-floor space.

· Sub-partition: a partition of type „Window”, „Door”, assigned by the User to selected partition in a compartment. The sub-partition has an assigned orientation towards cardinal points of the compass, in accordance with orientation of original partition and the effective area of original partition is reduced by the area of sub-partition.

· Compartment: a polyhedron closed by partitions (on a plan represented by polygon) with specified internal temperature (or non-heated) and known ventilation method.

· Graphic compartment: a compartment, the geometrical data and some tabular data of which are read from file of Instal-therm program, which includes plan view (or views) of building storey.

· Tabular compartment: a compartment defined by the User in tabular editor of Instal-heat&energy program. The tabular compartment can be present on graphic storey or tabular storey.

· Surface giving up the heat “A”: surface of building containing all partitions having contact with external environment.

· Partition: basic element of building construction separating compartments. Program recognizes partitions made of homogeneous and inhomogeneous layers according to norm EN ISO 6946.

· Cooling partition: external partition as external wall, ceiling over passage, window and outer doors, internal partition, which has another temperature on both sides declared, as well as internal partition between heated and non-heated compartment.

· Graphic partition: a partition, the geometrical data of which (length, width, location towards others) are read from file of Instal-therm program. Internal construction (layers) is described in tabular way.

· Non-cooling partition: a partition from the set of internal partitions, which has the same, given temperature on both sides or the temperature difference is Δt ≤ 4K

· Tabular partition: a partition used for description of a compartment (graphic or tabular) in tabular editor of Instal-heat&energy program. Internal structure (of layer) has been described in tabular manner.

· Partition with enforced „U” (or „R”): it is possible to declare a partition with unknown layers and known heat transfer coefficient „U” or thermal resistance „R”.

· Inhomogeneous partition: partition which includes in its cross-section repeatable elements with different construction and thermal properties.

· Non-heated space: compartments or closed spaces, which are not the part of heated space. Temperatures in not heated compartments are always determined by program of thermal balance.

· Heated space: compartments or closed spaces heated to certain calculation temperature.

· Program clipboard: especially dedicated program clipboard, independent on Windows clipboard.

· Heat loss (heat demand) of building: heating peak power demand for calculated external conditions.

· Corrected heat transfer coefficient Uc: heat transfer coefficient of partition Uo corrected by value of norm addition and addition taking into consideration presence of heat leakage bridges in partition.

· Specific coefficient of heat loss by penetration HT: coefficient of heat loss by penetration related to the heated area of a building.

· Heat loss for minimal ventilation Φv, min: heat loss for heating of air, the volume of which results from hygienic requirements in compartment. Normative, hygienic volume of air depends on the type of compartment. In non-heated compartments the hygienic stream of ventilation air does not occur.

· Heat loss by mechanical, blow ventilation Φv, su: heat loss for heating of air blown into compartment which should be heated up from the value of external air temperature to the value of declared blown air temperature. If the temperature of blown air is lower than the temperature in compartment, then the loss for blown ventilation in compartment will be calculated.

· Heat loss as a result of operation of exhaust ventilation Φmech, su: heat loss for heating of air flowing into compartment from external environment through leakages and/or from other compartments as a result of operation of mechanical exhaust ventilation

· Total heat loss for ventilation Φv in compartment: total heat loss for heating of ventilation air in heated compartment. Calculated on the basis of maximal value of ventilation air stream, selected from the value of hygienic air stream or sum of air streams flowing as a result of operation of mechanical ventilation (blow/exhaust) and infiltration.

· Total net heat loss of a building ΦNetto: sum of heat losses by penetration and for ventilation taking into consideration all heated compartments in the building.

· Total heat demand (by temporary temperature reduction) ΦRH: sum of additional heat demand calculated for compartments, in which temporary temperature reduction has been declared.

· Total heat loss of a building ΦHLbuild : heat loss being the sum of total heat net loss of a building and total heat demand resulting from temporary temperature reduction.

· Thermal zone: part of heated space with specified calculation temperature, in which special deviations of temperature can be omitted. Thermal zone is defined according to norm EN 832:1998.

· Data table: a table in which data of elements of the same type can be defined.

· Indicator EA: indicator of seasonal energy demand related to heated area of part of a building, most often expressed in MJ/m2year. Boundary values of this indicator are designated by EAO.

· Indicator EV: indicator of seasonal energy demand related to cubic capacity of heated space, most often expressed in MJ/m3year. Boundary values of this indicator are designated by Evo.

· Coefficient of heat loss for ventilation: index of heat losses for ventilation, resulting from the volume of ventilation air and its density and specific heat.

· Coefficient of heat loss by penetration: index of heat losses by penetration, depending on the value of partition heat penetration coefficient, its area and on correcting coefficient depending on the partition type, e.g. external partition, partition between heated and non-heated compartment, partition between heated compartments of different temperatures.

· Energy demand of a building: amount of energy, which must be supplied to heated space, indispensable for maintaining the internal calculation temperature in heated space, within specified time (month or heating season), expressed in MJ or kWh.

Other definitions are in compliance with norm EN 12831, EN 832:1998 and with not connected norms.

Both in instruction and in program there are some abbreviations applied for most often used names. Below the list of abbreviations:

Heat loss by penetration | ФT
Heat loss for ventilation | ФV
Total net heat loss | ФNetto
Total heat loss, reduced | ФZred
Heat loss for minimal ventilation | ФV, min
Heat loss for infiltration | ФV, inf
Heat loss by ventilation, mechanical, blow | ФV, su
Heat loss as a result of operation of exhaust installation | Фmech, inf
Total heat demand (by temporary temperature reduction) | ФRH
Total heat loss of a building | ФHL, build
Coefficient of heat loss for ventilation | HV
Coefficient of heat loss by penetration | HT
Minimal stream of ventilation air | Vmin
Ventilation air stream | Vinf
Stream of air blown mechanically | Vsu*fv
Stream of external air flowing as a result of excess of removed air | Vmech, inf
Ventilation air stream | V
Temperature on heaters supply | tz/θz
Default cooling of heating agent in a heater | Dt/Dθ
Inner temperature | ti/ θi
Declaration, whether the partition is heated (Yes/No) | O
Declaration, whether automatic dimensions are possible (Yes/No) | A
Partition heat transfer coefficient | UO
Normative addition to partition heat transfer coefficient | DUo
Addition because of the presence of heat leakage bridges in partition | DU
Corrected partition heat transfer coefficient | UC
Specific coefficient of heat loss by penetration | HT’