Revision history [back]

I did my own research last night as per the attached paper & other info.

Let me explain what was the intention of having a balance point temperature. I wanted to know the balance point temperature to understand when exactly my Q(envelope loss) is lesser than Q(internal gain)+Q(sol). I also wanted to calculate the hourly values for South facing zones as the architects wants to have a dynamic shades only for the times when there is a 'direct glare in the space' + 'cooling need". As cooling is needed only if the Outside temperature is higher than the "balance point temperature", we just need to create the hourly reports for 1. outside temperature, 2. Cooling load for the zone. Whenever the cooling load is equal to zero, the outside temperature will be considered as the balance point temperature for that particular hour.

I also created 2 more reports for hourly basis: 1. Vertical solar angle on the window 2. Horizontal solar angle on the window.

Now, in the excel report, I just used an IF+AND+OR statement to understand when exactly I need the shade in the space. I need the shade when 1. Cooling load is more than zero, 2. Horizontal or vertical angle is more than zero (which means there is a direct sunlight falling on the window).

It's a very high level study for now followed by some more ladybug runs for the dynamic shades, but atleast gives a rough idea for how many hours we need the shade & what's going to be it's depth.

I just wanted to share what I found out, in case someone else has this question in the future.

I did my own research last night as per the attached paper & other info.

Let me explain what was the intention of having a balance point temperature. I wanted to know the balance point temperature to understand when exactly my Q(envelope loss) is lesser than Q(internal gain)+Q(sol). I also wanted to calculate this information as the hourly values for just South facing zones as the architects wants to have a dynamic shades only for the times when there is a 'direct glare in the space' + 'cooling need".

As cooling is needed only if the Outside temperature is higher than the "balance point temperature", we I just need to create needed to generate the hourly reports for 1. outside temperature, 2. Cooling load for the selected zone. Whenever the cooling load is equal to zero, the outside temperature will be considered as the balance point temperature for that particular hour.

I also created 2 more reports for on hourly basis: 1. Vertical solar angle on the window 2. Horizontal solar angle on the window.

Now, in the excel report, I just used an IF+AND+OR statement to understand when exactly I need to have the shade in the on the window for south facing space. I need the shade when 1. Cooling load is more than zero, 2. Horizontal or vertical angle is more than zero (which means there is a direct sunlight falling on the window).

It's a very high level study for now followed by some more ladybug runs for the dynamic shades, but atleast gives a rough idea for how many hours we need the shade & what's going to be it's depth.

I just wanted to share what I found out, in case someone else has this question in the future.

I did my own research last night as per the attached paper & other info.

Let me explain what was the intention of having a balance point temperature. I wanted to know the balance point temperature to understand when exactly my Q(envelope loss) is lesser than Q(internal gain)+Q(sol). I wanted this information as the hourly values for just South facing zones as the architects wants to have a dynamic shades only for the times when there is a 'direct glare in the space' + 'cooling need".

As cooling is needed only if the Outside temperature is higher than the "balance point temperature", I just needed to generate the hourly reports for 1. outside temperature, 2. Cooling load for the selected zone. Whenever the cooling load is equal to zero, the outside temperature will be considered as the balance point temperature for that particular hour.

I also created 2 more reports on hourly basis: 1. Vertical solar angle on the window 2. Horizontal solar angle on the window.

Now, in the excel report, I used an IF+AND+OR statement to understand when exactly I need to have the shade on the window for south facing space. I need the shade when 1. Cooling load is more than zero, 2. Horizontal or vertical angle is more than zero (which means there is a direct sunlight falling on the window).

It's a very high level study for now followed by some more ladybug runs for the dynamic shades, but atleast gives a rough idea for how many hours we need the shade & what's going to be it's depth.

I just wanted to share what I found out, in case someone else has have this question in the future.