<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><div></div><div><span class="Apple-style-span" style="font-family: 'Lucida Grande', Verdana, Helvetica, Arial, sans-serif; font-size: 12px; color: rgb(68, 68, 68); line-height: 16px; ">I am curious to know how you (the community) have modeled indirect DHW heaters in the past. There are two methods that I know of, and have employed in the past. <br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">1. Model the DHW load as a process load on you boiler loop. When done this way, you get the actual DHW energy consumption because the
boilers will be at the proper point on the efficiency curves. The down side is that you don't get the proper energy breakdown in the eQuest results summary. <br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">2. Model the DHW heater with the same curves as your boilers. When done this way, the results may be off because your boiler and DHW heater will be at different points on the efficiency curves, but you will have the proper breakdown in the summary.<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><br style="margin-top: 0px; margin-right: 0px; margin-bottom:
0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">Does anyone have a better solution for modeling an indirect fired domestic hot water heater?</span></div><div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><br></div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><br></div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><br><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><font size="2" face="Tahoma">-Eddie</font></div></div></div><div style="position:fixed"></div>
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