| Name | Edmund Resor |
|---|---|
| Email address | edresor@gmail.com |
| Phone number | |
| Where is your project located? | United States |
| State/Province | Wyoming |
| Nearest City or County | Teton |
| How would you like use to size your system? | Size by Square Footage and Location |
| Estimated Heating Demand | 14.2 kW ( 48464.6 BTU/hr ) |
| Output of selected heat pump at design temperature (-30C/-22F maximum) | 14.2kW |
| Percentage of demand load requirement produced by heat pump at design temperature (-30C/-22F maximum) | 100% |
| External backup boiler required | 15kW |
| Internal backup boiler required if using Alt Source tank | 18kW |
| Heating Design Temperature | -15° F |
| Total Square Footage (sq. ft.) | 3025sq.ft. |
| Insulation | Medium |
| Arctic heat pump required | 2 x 050ZA/BE |
| Comments | Please estimate the size using 3,035 sq. ft. and -10 F for the designt temperature. The Teton County design temperature of -30 F is not useful for the design of heat pump systems. (It's OK, but not necessary for sizing backup electric heaters. It is mainly used for sizing fossil fuel and electric boilers.) The house is 20 years and in good condition with good radiant floor heat. (We do not want cooling.) We would be replacing a traditional natural gas boiler and indirect water heater that supplies hot water for 5 people. The boiler has a DOE capacity of 117,000 Btu/hr. Electricity costs $0.067 / kWh, but we would design for future costs of $0.10 / kWh. Please answer the following questions to help us run our own energy model. 1) At what Ambient temperature does your heat pump shut off and use 100% electric heat? (See note below.) 2) Do you have an outdoor reset (ODR) system to reduce the temperature of the water in the floor from 45 C (113 F) when the ambient temperature is higher? 3) If so, how is hot water supplied if the ODR system reduces the temperature of the fluid in the buffer tank? 4) Would you please provide a more detailed table of the COP for various ambient temperatures and water supply temperatures? Note: You website says: "our units can effectively harvest heat from the outdoor air down to -35°C or 31°F. For temperatures below this, the system automatically engages your backup heat source." However, your specifications show a COP of 1.9 at -20 C (-4 F). Does you heat pump operate down to -20 C and use the electric heat as a supplement or does the heat pump shut down as use 100% electric resistance heat. |
| Contact by Arctic Agent | Yes |
*NOTE* - The heating demand load we have estimated for this project is likely to be inaccurate. There are many variables that factor into a building’s heating demand, and although square footage and insulation value are major factors, many other building variables contribute. We compared the results of this tool against hundreds of custom manual J reports and found that this tool predicted the demand load within +/- 10% of actual calculated load in 25% of the manual J results we compared to. This tool has limited accuracy when predicting the demand load of a single project but is very accurate at predicting average demand loads on a macro scale.
To get a more accurate estimation of the final demand load range for your unique project, we suggest you run this tool at all three insulation value options (High, Medium, Low). 90% of the manual J reports we compared to have a demand load that fits within the three predictions generated by running this report at all three insulation values.
Arctic takes no responsibility for any performance issues resulting from using this estimation to size a heat pump. We recommend that every customer has a manual J conducted before purchasing heating and cooling equipment. A manual J is the most accurate way to predict a building’s demand load.
If you would like Arctic to conduct a manual J for your project, please click the link below:
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