Experiment to test heating impulse response of room 5s (study) at 16WW
DHD20210429

Rad is 2-panel pressed steel ~50cm x 50cm on microbore pipework.


Preparation:
  * Room curtains drawn to minimise solar gain.
  * 4o outside temperature measurement in porch reinstated:
      * Sunny so some solar gain.
  * Second temperature measurement stream near geometric centre of room:
      * Eye level on corner of chest of drawers.
      * Using 1g for this temporarily.  Have replaced 1g with shut Radbot.
  * All Radbots turned down to * (frost).
  * 5s Radbot removed from rad and placed nearby to continue to measure temps.
  * Heat-sensitive gadgets removed from room.
  * Note weather conditions, validate 4o, 5s and room-centre temperature stream.
      * Some direct sunshine, cool.
  * Old house stat turned up to max (>30C) to force-enable heating.
  * Gas reading before (m^3): XXX5.622 @ 2021-04-29T08:31Z
  * (Using 1m^3 of gas = 11.1kWh.)

During:
  * Gas reading before (m^3): XXX5.622
  * Start time: 08:52Z
  * Switch boiler to CH+DHW mode.
  * Windows and doors of 5s to room closed.
  * Measure rad flow temperature at boiler as well as possible:
    ~47C w/N84FR on boiler pipe.
  * Ensure that gas not used for other purposes eg DHW.
  * Gas reading intermediate (m^3): XXX6.127 @ 2021-04-29T11:27Z  5.6kWh
  * Gas reading intermediate (m^3): XXX6.560 @ 2021-04-29T14:22Z 10.4kWh
  * Gas reading intermediate (m^3): XXX6.664 @ 2021-04-29T15:18Z 11.6kWh
  * Gas reading intermediate (m^3): XXX6.791 @ 2021-04-29T16:05Z 13.0kWh
  * Temp reading from stand-alone digital thermometer at eye-height ~28C.
  * Continue until 5s room temperature stabilised if possible!  (Didn't happen.)
  * Record end time: 16:05Z (433m, 7.2h)
  * Gas reading end (m^3): XXX6.791 @ 2021-04-29T16:05Z 13.0kWh ~1.8kW mean

After:
  * Plot and publish implied thermal characteristics of 5s.
  * Making good:
      * House stat back to 10C (minimum).
      * Boiler back to DHW only, and on clock not always on.
      * Re-opened lockshield on 3l.
      * Put 1g back.
  * Have left all Radbots on * (frost), or 1 for 1g because of dial issue.
  * Chart captured at img/2021/20210429-16WWmultisensortempL.png
  * Windows opened wide to cool off!

Notes:
  * May be minor DHW use from hand-washing.  (May have been none in fact.)
  * 3l rad came on so had to turn off at lockshield.
  * DHD error: heating went off a little before 4pm (normally off 4pm to 7pm) noticed at ~4:20pm (15:20Z) and put onto clock to always-on mode.