PDF Publication Title:
Text from PDF Page: 040
to meet the house’s heating load. When the outdoor temperature is lower than 28oF, some amount of supplemental heat will be required. Taking this analysis further requires data for outdoor temperatures over the heating season. CLIMATE CONSIDERATIONS The next step in answering questions related to seasonal performance is to combine the performance information for the heat pump and house with climate data for Boston. Because the heating capacity of an air-to-water heat pump is highly dependent on outdoor air temperature, its seasonal performance will depend on the time during which the heat pump operates at different outdoor temperatures. Data for long-term averages of hourly outdoor temperature is readily available for hundreds of locations in North America. Sources for this data include: • ACCA manual J • ASHRAE Weather Data Viewer software Figure 5-4 shows an example of “bin” temperature data for Boston, MA. In this case, the “bins” are 5oF wide. Each vertical bar gives the number of hours that the outdoor temperature falls within the specified range, based on long-term average values for those temperatures. On any specific year, the number of hours in each bin may be higher or lower than the long-term average. The outdoor design temperature in Boston is 9oF. Notice how many hours correspond to outdoor temperatures significantly higher than this design temperature. This implies that most of the heating occurs under partial load conditions. If internal heat gains are minimal, and thermostat setbacks are not used, space heating loads can be modeled as being approximately proportional to the difference between the indoor setpoint temperature and the outdoor temperature. This allows the heating load to be calculated as a percentage of design heating load using the average outdoor temperature for each bin. Figure 5-5 shows a Figure 5-4 900 675 450 225 0 Hours in bin (hours) temperature bin (oF) 40 -20 ≤ -15 -15 ≤ -10 -10 ≤ -5 -5 ≤ 0 0≤5 5 ≤ 10 10 ≤ 15 15 ≤ 20 20 ≤ 25 25 ≤ 30 30 ≤ 35 35 ≤ 40 40 ≤ 45 45 ≤ 50 50 ≤ 55 55 ≤ 60 60 ≤ 65 65-70 hours in this binPDF Image | Heat Pump Systems 2020
PDF Search Title:
Heat Pump Systems 2020Original File Name Searched:
idronics_27_na.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |