Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
It sounds like you're working with a single-stage indirect evaporative cooler that doubles as a dry heat exchanger for heat recovery in the winter. In that case, you should just model it as a single component with a certain effectiveness, which is the fraction of the total wet-bulb depression (Tdry - Twet). Most of the literature I've seen have default effectivenesses (?) of 0.85 for direct and 0.60 for indirect evap coolers. If you want to get a little more fancy, you could add an effectiveness curve that varies with the part-load ratio and wet bulb temperature. Back in the early 1990's, I worked with a Visiting Scholar from China (Prof. Chen Peilin) who developed a detailed indirect evaporative cooler model that he then used to calculate effectiveness curves for IEC precoolers that I then incorporated into the DOE-2 program ( see www.osti.gov/scitech/servlets/purl/10116977). I'm sorry that I don't have digital copies of most of my evap cooling papers, but I do have the last one where I calibrated my models against PGE measured data at http://www.whiteboxtechnologies.com/download_06_YJH_PGE_evapcool_rpt.htm that might be of help.
| | 2 | No.2 Revision |
It sounds like you're working with a single-stage indirect evaporative cooler that doubles as a dry heat exchanger for heat recovery in the winter. In that case, you should just model it as a single component with a certain effectiveness, which is the fraction of the total wet-bulb depression (Tdry - Twet). Most of the literature I've seen have default effectivenesses (?) of 0.85 for direct and 0.60 for indirect evap coolers. If you want to get a little more fancy, you could add an effectiveness curve that varies with the part-load ratio and wet bulb temperature. Back in the early 1990's, I worked with a Visiting Scholar from China (Prof. Chen Peilin) who developed a detailed indirect evaporative cooler model that he then used to calculate effectiveness curves for IEC precoolers that I then incorporated into the DOE-2 program ( see www.osti.gov/scitech/servlets/purl/10116977). I'm sorry that I don't have digital copies of most of my evap cooling papers, but I do have the last one where I calibrated my models against PGE measured data at http://www.whiteboxtechnologies.com/download_06_YJH_PGE_evapcool_rpt.htm http://www.whiteboxtechnologies.com/"download_06_YJH_PGE_evapcool_rpt.htm" that might be of help.
| | 3 | No.3 Revision |
It sounds like you're working with a single-stage indirect evaporative cooler that doubles as a dry heat exchanger for heat recovery in the winter. In that case, you should just model it as a single component with a certain effectiveness, which is the fraction of the total wet-bulb depression (Tdry - Twet). Most of the literature I've seen have default effectivenesses (?) of 0.85 for direct and 0.60 for indirect evap coolers. If you want to get a little more fancy, you could add an effectiveness curve that varies with the part-load ratio and wet bulb temperature. Back in the early 1990's, I worked with a Visiting Scholar from China (Prof. Chen Peilin) who developed a detailed indirect evaporative cooler model that he then used to calculate effectiveness curves for IEC precoolers that I then incorporated into the DOE-2 program ( see www.osti.gov/scitech/servlets/purl/10116977). link:www.osti.gov/scitech/servlets/purl/10116977). I'm sorry that I don't have digital copies of most of my evap cooling papers, but I do have the last one where I calibrated my models against PGE measured data at http://www.whiteboxtechnologies.com/"download_06_YJH_PGE_evapcool_rpt.htm" link:http://www.whiteboxtechnologies.com/download_06_YJH_PGE_evapcool_rpt.htm that might be of help.
| | 4 | No.4 Revision |
It sounds like you're working with a single-stage indirect evaporative cooler that doubles as a dry heat exchanger for heat recovery in the winter. In that case, you should just model it as a single component with a certain effectiveness, which is the fraction of the total wet-bulb depression (Tdry - Twet). Most of the literature I've seen have default effectivenesses (?) of 0.85 for direct and 0.60 for indirect evap coolers. If you want to get a little more fancy, you could add an effectiveness curve that varies with the part-load ratio and wet bulb temperature. Back in the early 1990's, I worked with a Visiting Scholar from China (Prof. Chen Peilin) who developed a detailed indirect evaporative cooler model that he then used to calculate effectiveness curves for IEC precoolers that I then incorporated into the DOE-2 program ( see link:www.osti.gov/scitech/servlets/purl/10116977). this paper. I'm sorry that I don't have digital copies of most of my evap cooling papers, but I do have the last one where I calibrated my models against PGE measured data at link:http://www.whiteboxtechnologies.com/download_06_YJH_PGE_evapcool_rpt.htm [here] (http://www.whiteboxtechnologies.com/download_06_YJH_PGE_evapcool_rpt.htm) that might be of help.
| | 5 | No.5 Revision |
It sounds like you're working with a single-stage indirect evaporative cooler that doubles as a dry heat exchanger for heat recovery in the winter. In that case, you should just model it as a single component with a certain effectiveness, which is the fraction of the total wet-bulb depression (Tdry - Twet). Most of the literature I've seen have default effectivenesses (?) of 0.85 for direct and 0.60 for indirect evap coolers. If you want to get a little more fancy, you could add an effectiveness curve that varies with the part-load ratio and wet bulb temperature. Back in the early 1990's, I worked with a Visiting Scholar from China (Prof. Chen Peilin) who developed a detailed indirect evaporative cooler model that he then used to calculate effectiveness curves for IEC precoolers that I then incorporated into the DOE-2 program see this paper. I'm sorry that I don't have digital copies of most of my evap cooling papers, but I do have the last one where I calibrated my models against PGE measured data [here] (http://www.whiteboxtechnologies.com/download_06_YJH_PGE_evapcool_rpt.htm) here that might be of help.
| | 6 | No.6 Revision |
It sounds like you're working with a single-stage indirect evaporative cooler that doubles as a dry heat exchanger for heat recovery in the winter. In that case, you should just model it as a single component with a certain effectiveness, which is the fraction of the total wet-bulb depression (Tdry - Twet). Most of the literature I've seen have default effectivenesses (?) of 0.85 for direct and 0.60 for indirect evap coolers. If you want to get a little more fancy, you could add an effectiveness curve that varies with the part-load ratio and wet bulb temperature. Back in the early 1990's, I worked with a Visiting Scholar from China (Prof. Chen Peilin) who developed a detailed indirect evaporative cooler model that he then used to calculate effectiveness curves for IEC precoolers that I then incorporated into the DOE-2 program see this paper. I'm sorry that I don't have digital copies of most of my evap cooling papers, but I do have the last one where I calibrated my models against PGE measured data here that might be of help.
