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Dear Forum, When modeling for compliance with ASHRAE 90.1, DX and chiller systems must comply with specific requirements for EER / COP and IEER (or IPLV for older versions). That seems to be a "two-edged sword" - you're trying to meet two different criteria, each of which affects the other. For actual / specified equipment you can (in theory) obtain the performance data and create curves which represent the performance. That's somewhat painful, but do-able.

For "baseline" systems, there is no manufacturer data. Hmmmm.... What's a modeler to do?

I have some ideas about how to solve this dilemna, but I'm wondering what others have done. The most obvious solutions are:

1. Ignore the IEER and hope for the best
2. Plug in default or example file values and hope for the best
3. Tinker endlessly with curve coefficients till the result are close to what is needed
4. Wave a magic wand :)

I'd love to hear what approach you take.

Dear Forum, When modeling for compliance with ASHRAE 90.1, DX and chiller systems must comply with specific requirements for EER / COP and IEER (or IPLV for older versions). That seems to be a "two-edged sword" - you're trying to meet two different criteria, each of which affects the other. For actual / specified equipment you can (in theory) obtain the performance data and create curves which represent the performance. That's somewhat painful, but do-able.

For "baseline" systems, there is no manufacturer data. Hmmmm.... What's a modeler to do?

I have some ideas about how to solve this dilemna, but I'm wondering what others have done. The most obvious solutions are:

1. Ignore the IEER and hope for the best
2. Plug in default or example file values and hope for the best
3. Tinker endlessly with curve coefficients till the result are close to what is needed
4. Wave a magic wand :)

I'd love to hear what approach you take.

Dear Forum, When modeling for compliance with ASHRAE 90.1, DX and chiller systems must comply with specific requirements for EER / COP and IEER (or IPLV for older versions). That seems to be a "two-edged sword" - you're trying to meet two different criteria, each of which affects the other. For actual / specified equipment you can (in theory) obtain the performance data and create curves which represent the performance. That's somewhat painful, but do-able.

For "baseline" systems, there is no manufacturer data. Hmmmm.... What's a modeler to do?

I have some ideas about how to solve this dilemna, but I'm wondering what others have done. The most obvious solutions are:

1. Ignore the IEER and hope for the best
2. Plug in default or example file values and hope for the best
3. Tinker endlessly with curve coefficients till the result are close to what is needed
4. Wave a magic wand :)

I'd love to hear what approach you take.