Three questions re MVHR.

Calahonda52

1: Irish Heating Degree Hours
I see from one of the Passiv Haus related sites that there are two sites in Ireland for which there are Heating Degree Hours figures that can be used in the PH design program.
I don't have any paid access to any of the sites.

If I recall correctly they are Dublin and Birr, with the latter have a value of 70k Kh/a for 2013.

Is the math as follows:?
Take a design temp say 20 degrees minus the average outside temp say for Jan of 5 degrees gives 15 degrees by 31 days = 465 DD (degree days) or 11,160 degree hours for January or 11.16k degree hours, i.e. 11.6k Kh where K is kelvin

As an aside, do DEAP/SAP use the same number of daily heating hours as the Passhaus design?


2: MVHR Unit design pressures
Is there a standard design pressure: I see some units quoted in X cubic meters per hour at 100 Pa, others X cubic meters per hour at 150 Pa.
The latter would suggest higher speeds, perhaps above the 2.5 m/s which I gather is the max speed at the fresh air vents, with perhaps smaller ducts.

3: Max temp of any inline heaters.
I see 45 C and 52 C in various places.
Is this the max surface temp of the elec or water heating coil or is it the max temp that air can be heated to?

Thanks