Changes to outdoor design temperatures (ODT)
We are updating our default outdoor design temperatures (ODT) in Heatpunk. The ODT of any existing projects created prior to this update will be automatically changed as per the "Temp difference" column of table 1, based on project location.
This will have an impact on the project's heat loss and so if you wish to return the project ODT to its original then this can be done by taking the relevant temp from the below table and editing the project ODT within the heat pump task. An additional 0.3°C will need to be removed for every 50 m above sea level, with altitude given in the input section of the technical report & customer proposal.
For the design outdoor temperature, Heatpunk will use CIBSE guide A "99th percentile" temperature for the relevant project location. This means the temperature will only fall below this for 1% of the year. You may choose to use the 99.6th percentile which is listed in table 1, in which case no additional uplift is needed for intermittent heating or exposed locations (see MIS 3005-d for ref).
Using the project's location, an additional 0.3°C will automatically be removed from the ODT for every 50 m above sea level.
Table 1:
|
Postcode
|
Heatpunk (pre-update) | CIBSE Guide A | Temp difference (°C) between Heatpunk and DB 99% | ||
| Location | ODT (°C) | DB 99.6% (°C) | DB 99% (°C) | ||
| AB | NE Scotland (Dyce) | -4.2 | -5.4 | -3.2 |
+1 |
| AL | Thames Valley (Heathrow) | -2 | -3 | -1.7 | +0.3 |
| B | Midland (Elmdon) | -3.4 | -5.1 | -3.2 | +0.2 |
| BA | Severn Valley (Filton) | -1.7 | -4.6 | -2.9 | -1.2 |
| BB | W Pennines (Ringway) | -2.2 | -4.5 | -2.7 | -0.5 |
| BD | E Pennines (Finningley) | -2.5 | -3.3 | -1.9 | +0.6 |
| BH | Southern (Hurn) | -1.5 | -4.8 | -3.4 | -1.9 |
| BL | W Pennines (Ringway) | -2.2 | -4.5 | -2.7 | -0.5 |
| BN | Southern (Hurn) | -2.1 | -4.8 | -3.4 | -1.3 |
| BR | South-eastern (Gatwick) | -3.2 | -3 | -1.7 | +1.5 |
| BS | Severn Valley (Filton) | -1.7 | -3.1 | -1.5 | +0.2 |
| BT | Northern Ireland (Belfast) | -1.2 | -3.2 | -1.5 | -0.3 |
| CA | North-western (Carlisle) | -3.7 | -3.7 | -2 | +1.7 |
| CB | Thames Valley (Heathrow) | -2.5 | -3 | -1.7 | +0.8 |
| CF | Severn Valley (Filton) | -1.6 | -3.1 | -1.5 | +0.1 |
| CH | W Pennines (Ringway) | -2.2 | -4.5 | -2.7 | -0.5 |
| CM | Thames Valley (Heathrow) | -2.3 | -3 | -1.7 | +0.6 |
| CO | E Anglia (Honington) | -2.3 | -4.6 | -3.1 | -0.8 |
| CR | Southern (Hurn) | -2 | -3 | -1.7 | +0.3 |
| CT | South-eastern (Gatwick) | -3.2 | -3 | -1.7 | +1.5 |
| CV | Midland (Elmdon) | -3.4 | -5.1 | -3.2 | +0.2 |
| CW | W Pennines (Ringway) | -2.7 | -4.5 | -2.7 | 0 |
| DA | South-eastern (Gatwick) | -3.2 | -3 | -1.7 | +1.5 |
| DD | E Scotland (Leuchars) | -3.8 | -5.4 | -3.2 | +0.6 |
| DE | W Pennines (Ringway) | -2.2 | -3.9 | -2.4 | -0.2 |
| DG | Borders (Boulmer) | -3.8 | -5.6 | -3.5 | +0.3 |
| DH | North-eastern (Leeming) | -3.7 | -3.7 | -2 | +1.7 |
| DL | North-western (Carlisle) | -3.7 | -3.7 | -2 | +1.7 |
| DN | E Pennines (Finningley) | -3.4 | -3.3 | -1.9 | +1.5 |
| DT | Southern (Hurn) | -1.7 | -4.8 | -3.4 | -1.7 |
| DY | Midland (Elmdon) | -3.4 | -5.1 | -3.2 | +0.2 |
| E | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 |
+0.1 |
| EC | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| EH | E Scotland (Leuchars) | -3.4 | -5.4 | -3.2 | +0.2 |
| EN | South-eastern (Gatwick) | -2.1 | -3 | -1.7 | +0.4 |
| EX | South-western (Plymouth) | -1.5 | -1.5 | -0.2 | +1.3 |
| FK | E Scotland (Leuchars) | -3.7 | -5.6 | -3.5 | +0.2 |
| FY | North-western (Carlisle) | -2.2 | -4.5 | -2.7 | -0.5 |
| G | W Scotland (Abbotsinch) | -3.9 | -5.6 | -3.5 | +0.4 |
| GL | Midland (Elmdon) | -3.3 | -4.6 | -2.9 | +0.4 |
| GU | Thames Valley (Heathrow) | -2.2 | -3 | -1.7 | +0.5 |
| GY | South-eastern (Gatwick) | -1 | -4.8 | -3.4 | -2.4 |
| HA | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| HD | E Pennines (Finningley) | -3.5 | -4.5 | -2.7 | +0.8 |
| HG | E Pennines (Finningley) | -3.5 | -3.3 | -1.9 | +1.6 |
| HP | Thames Valley (Heathrow) | -2 | -3 | -1.7 | +0.3 |
| HR | Midland (Elmdon) | -2 | -5.1 | -3.2 | -1.2 |
| HS | NW Scotland (Stornoway) | -1 | -5.6 | -3.5 | -2.5 |
| HU | E Pennines (Finningley) | -3 | -3.3 | -1.9 | +1.1 |
| HX | W Pennines (Ringway) | -2.5 | -4.5 | -2.7 | -0.2 |
| IG | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| IM | W Pennines (Ringway) | -2.5 | -4.5 | -2.7 | -0.2 |
| IP | E Anglia (Honington) | -2.3 | -4.6 | -3.1 | -0.8 |
| IV | NE Scotland (Dyce) | -4 | -5.6 | -3.5 | +0.5 |
| JE | South-eastern (Gatwick) | -1 | -4.8 | -3.4 | -2.4 |
| KA | W Scotland (Abbotsinch) | -3.7 | -5.6 | -3.5 | +0.2 |
| KT | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 |
+0.1 |
| KW | NE Scotland (Dyce) | -4.2 | -5.4 | -3.2 | +1 |
| KY | E Scotland (Leuchars) | -3.4 | -5.4 | -3.2 | +0.2 |
| L | W Pennines (Ringway) | -2.4 | -4.5 | -2.7 | -0.3 |
| LA | North-western (Carlisle) | -2.2 | -4.5 | -2.7 | -0.5 |
| LD | Wales (Aberporth) | -2.9 | -3.1 | -1.5 | +1.4 |
| LE | Midland (Elmdon) | -3 | -3.9 | -2.4 | +0.6 |
| LL | W Pennines (Ringway) | -3 | -4.5 | -2.7 | +0.3 |
| LN | E Pennines (Finningley) | -3 | -3.9 | -2.4 | +0.6 |
| LS | E Pennines (Finningley) | -2.5 | -3.3 | -1.9 | +0.6 |
| LU | Thames Valley (Heathrow) | -2.4 | -3 | -1.7 | +0.7 |
| M | W Pennines (Ringway) | -2.2 | -4.5 | -2.7 | -0.5 |
| ME | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| MK | Midland (Elmdon) | -3.4 | -4.6 | -2.9 | +0.5 |
| ML | W Scotland (Abbotsinch) | -3.9 | -5.4 | -3.2 | +0.7 |
| N | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| NE | North-eastern (Leeming) | -3.4 | -3.7 | -2 | +1.4 |
| NG | E Anglia (Honington) | -3.2 | -3.9 | -2.4 | +0.8 |
| NN | Midland (Elmdon) | -3 | -3.9 | -2.4 | +0.6 |
| NP | Midland (Elmdon) | -1.6 | -3.1 | -1.5 | +0.1 |
| NR | E Anglia (Honington) | -2.4 | -4.6 | -3.1 | -0.7 |
| NW | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| OL | W Pennines (Ringway) | -3.2 | -4.5 | -2.7 | +0.5 |
| OX | Midland (Elmdon) | -2.4 | -4.6 | -2.9 | -0.5 |
| PA | W Scotland (Abbotsinch) | -4 | -5.6 | -3.5 | +0.5 |
| PE | E Anglia (Honington) | -3 | -4.6 | -3.1 | -0.1 |
| PH | NE Scotland (Dyce) | -3.8 | -5.6 | -3.5 | +0.3 |
| PL | South-western (Plymouth) | -0.2 | -1.5 | -0.2 | 0 |
| PO | Southern (Hurn) | -1.8 | -4.8 | -3.4 | -1.6 |
| PR | North-western (Carlisle) | -3.2 | -4.5 | -2.7 | +0.5 |
| RG | Thames Valley (Heathrow) | -2.2 | -4.6 | -2.9 | -0.7 |
| RH | Thames Valley (Heathrow) | -1.9 | -3 | -1.7 | +0.2 |
| RM | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| S | W Pennines (Ringway) | -2.8 | -3.3 | -1.9 | +0.9 |
| SA | Wales (Aberporth) | -1.6 | -3.1 | -1.5 | +0.1 |
| SE | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| SG | Thames Valley (Heathrow) | -2 | -3 | -1.7 | +0.3 |
| SK | W Pennines (Ringway) | -2.9 | -4.5 | -2.7 | +0.2 |
| SL | Thames Valley (Heathrow) | -2 | -3 | -1.7 | +0.3 |
| SM | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| SN | Midland (Elmdon) | -2.2 | -4.6 | -2.9 | -0.7 |
| SO | Southern (Hurn) | -1.8 | -4.8 | -3.4 | -1.6 |
| SP | Southern (Hurn) | -1.8 | -4.8 | -3.4 | -1.6 |
| SR | North-eastern (Leeming) | -3.7 | -3.7 | -2 | +1.7 |
| SS | Thames Valley (Heathrow) | -2.3 | -3 | -1.7 | +0.6 |
| ST | W Pennines (Ringway) | -3 | -5.1 | -3.2 | -0.2 |
| SW | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| SY- | Wales (Aberporth) | -3.3 | -5.1 | -3.2 | +0.1 |
| TA | Severn Valley (Filton) | -2.1 | -1.5 | -0.2 | +1.9 |
| TD | Borders (Boulmer) | -3.8 | -5.4 | -3.2 | +0.6 |
| TF | Midland (Elmdon) | -3.4 | -5.1 | -3.2 | +0.2 |
| TN | South-eastern (Gatwick) | -3.2 | -3 | -1.7 | +1.5 |
| TQ | South-western (Plymouth) | -1.3 | -1.5 | -0.2 | +1.1 |
| TR | South-western (Plymouth) | -1.4 | -1.5 | -0.2 | +1.2 |
| TS | North-eastern (Leeming) | -2.9 | -3.7 | -2 | +0.9 |
| TW | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| UB | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| W | Thames Valley (Heathrow) | -1.8 | -3 | -1.7 | +0.1 |
| WA | W Pennines (Ringway) | -2.1 | -4.5 | -2.7 | -0.6 |
| WC |
Thames Valley (Heathrow) |
-1.8 | -3 | -1.7 | +0.1 |
| WD |
Thames Valley (Heathrow) |
-2 | -3 | -1.7 | +0.3 |
| WF | E Pennines (Finningley) | -2.5 | -3.3 | -1.9 | +0.6 |
| WN | W Pennines (Ringway) | -2.1 | -4.5 | -2.7 | -0.6 |
| WR | Midland (Elmdon) | -3.3 | -5.1 | -3.2 | +0.1 |
| WS | Midland (Elmdon) | -3.4 | -5.1 | -3.2 | +0.2 |
| WV | Midland (Elmdon) | -3.4 | -5.1 | -3.2 | +0.2 |
| YO | E Pennines (Finningley) | -3.7 | -3.3 | -1.9 | +1.8 |
| ZE | NE Scotland (Dyce) | -3 | -5.4 | -3.2 | -0.2 |