Heat Network Protocol
Field X Field name Description 1 Community heat network index number (digits) Unique index number for each network, assigned automatically by database software and used for control and reference purposes. (See 7.1). 2 X Community heat network version number (2 digits) Network version for the network identified in field 1 It is numbered from 1 upwards and incremented if the network is extended and when equipment data is amended (for example a change to a heat generator) or if the energy use information is updated. 3 DB entry updated (yyyy/mmm/dd hh:mm) Date and time this record was created or last amended by the database administrator. 4 Description of network (up to 255 chs) A short description identifying the dwellings to which the network version applies. Where the network is constructed in phases this may also indicate which phases are connected. 5 X Validity end date (yyyy/mmm/dd) The last day of validity of this data record. Dwellings assessed after this date use a data record with a higher network version number (in the case of new dwellings the applicable assessment date is that of the as-designed assessment). Blank if there is no record with a higher network version number. 6 Community heat network name (up to 50 chs.) The name by which the community heat network is known. 7 Postcode of the Primary Energy Centre (up to 8 chs) The postcode of the energy centre providing heat for the network. Where there is more than one energy centre, it is the postcode for the energy centre supplying the largest amount of heat 8 Locality (up to 35 chs.) The locality in which the community heat network is situated. May be blank. 9 Town name (up to 30 chs.) The post town nearest to the community heat network. 10 Administrative area (up to 30 chs.) The administrative area in which the community heat network is situated. May be blank. 11 Date of initial operation (yyyy/mmm/dd) The date on which the energy centre was commissioned (or re-commissioned if the network is extended) to serve all dwellings included in the assessment. Blank if it is not yet operational or if the assessment includes dwellings not yet connected. 12 Total number of dwellings included (up to 5 digits) The total number of dwellings included in the assessment of the heat network. 13 Number of flats (up to 5 digits) The number of flats included in the assessment of the heat network 14 Non-domestic floor area connected (up to 6 digits) The floor area of any non-domestic buildings connected to the heat network. 15 Total number of existing dwellings (up to 5 digits) The number of dwellings which have been constructed. This can be less than the number in field 12 if the assessment included dwellings not yet constructed. 16 X Service provision (1 digit) Service provision, encoded as: 1 space and water heating; 3 space heating only; 4 water heating only. If a network has separate systems for space heating and water heating, there will be a record for each. 17 X Provisional or actual data (1 digit) Whether the record represents provisional (estimated) data or actual recorded data, encoded as 1 or 2 respectively. Provisional data may be assigned to new networks for which recorded data are not yet available. 18 X Year (4 digits) The calendar year to which the data relates. Blank if provisional data. 19 Heat metering on supply to network (1 digit) Whether the heat supplied to the network from the energy centre is metered. 1 for yes. 0 for no 20 Total MWh of heat per annum supplied to network (up to 6 digits) The annual amount of heat supplied to the network by the plant in the energy centre. 21 Total MWh of heat per annum delivered to customers (up to 6 digits) The annual amount of heat delivered to all customers (dwellings and non-domestic), thereby indicating the scale of the network. 22 Individual dwelling heat metering (1 digit) Whether the supply of heat to each individual dwelling is metered.1 for yes, 0 for no
23 Total MWh of heat per annum delivered to dwellings (up to 6 digits) The annual amount of heat delivered to dwellings. 24 Distribution route length in metres (up to 6 digits) The total length of the network heat distribution pipework route. In the case of underground pipework it is the total trench length containing pipework plus any internal distribution route within apartment block risers and laterals. It includes both flow and return water pipes i.e. it is not the sum of the flow and return pipework. 25 Linear loss (up to 7 digits eg xxx.xxx) The average heat loss per metre length of network heat distribution pipework route in W/m. 26 X Distribution loss factor (up to 4 chs, e.g. x.xx) Factor that allows for losses from the heat distribution network, see SAP section C3. Applicable to all connected premises. 27 Pumping electrical energy (up to 6 digits, e.g. xxxxxx) Annual electrical energy for pumping in the heat distribution network in kWh/year. 28 X Pumping electrical energy per dwelling (up to 6 digits, e.g. xxxx.xx) Annual electrical energy for pumping in the heat distribution network attributed to each dwelling, in kWh/year. 29 Carbon dioxide intensity of heat (up to 6 digits e.g. xx.xxx The average carbon dioxide intensity of the heat delivered to customers. in kg/kWh. This value takes into account all factors which influence the emissions associated with the heat supplied. It is based on the heat delivered to individual dwellings, and to the building in the case of non-domestic premises. 30 Primary energy factor of heat up to 5 digits e.g. xx.xx) The average primary energy factor of the heat delivered to customers. This value takes into account all factors which influence the primary energy associated with the heat supplied. It is based on the heat delivered to individual dwellings, and to the building in the case of non-domestic premises. 31 X Number of heat sources (1 digit) Number of separate heat sources (between 1 and 5). Heat sources are considered separate if they differ in heat source type or fuel, e.g. a set of boilers each using the same fuel are treated as one source with efficiency as defined in C2 of the SAP specification. 32 X A: Heat source type (1 digit) Group A: Type of heat generator, encoded as 1: CHP; 2: boilers; 3: heat pump; 4: waste heat from power station; 5: geothermal. If CHP is part of the installation it is given as Group A. 33 X A: Community fuel (2 digits) Group A: The community fuel to which the data relates, either one of community fuel codes in SAP Table 12, or 99 in the case of a fuel not in SAP Table 12. 34 X A: Fuel description (up to 30 chs) Group A: Description of the fuel in the preceding field. May be blank if field 33 is not 99. 35 X A: Heat efficiency (up to 4 digits, e.g. xx.x) Group A: Heat efficiency of heat source in % gross. 36 X A: Power efficiency (up to 4 digits, e.g. xx.x) Group A: Power efficiency of CHP plant in % gross. Blank if not applicable. 37 X A: Heat fraction (up to 5 digits, e.g. x.xxx) Group A: The fraction of heat supplied by the community heat network attributable to the heat source. 38 X A: Community fuel CO2 emission factor (up to 5 chs, e.g. xxx.x) Group A: The CO2 emission factor in kg/kWh for the fuel. Blank when field 33 is not 99. 39 X A: Community fuel primary energy factor (up to 4 chs, e.g. x.xx Group A: The primary energy factor for the fuel (dimensionless). Blank when field 33 is not 99. 40 to 31+8n X Group B, C, D, E Group B, C, D, E. Set of data in the same format as those for group A for other heat sources. n is the value in field 31.
