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One of the insights I had out in the field one day was that a heating load was different from a reheat load and that even if you needed 180-200°F water temperatures to a reheat coil serving a perimeter space on a cold winter day to heat it, you probably did not need water anywhere near that hot on a hot summer day to do reheat; i.e make the air a little less cold than you had made it for dehumidification purposes or because a different zone in the system needed the air that could. That insight lead to a design that recovered heat from a condenser water system during the summer months to serve the reheat loads in a hospital. |
| Low Temperature HW (aceee_low_temp_hw.pdf) |
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Successful HVAC design and efficient operation are inescapably linked to a “successful” building envelope design. From the HVAC system standpoint, a successful envelope must resist the transfer of heat and moisture and minimize the exchange of air across its boundary. While intuitive, these goals are often relegated to second place in favor of creating an aesthetically pleasing structure or making an architectural statement. The construction industry often presumes that if no water penetrates the building envelope, then the integrity of the system is satisfactory. But, scientific analysis and practical experience demonstrate that infiltration can lead to frozen pipes, condensation, and occupant discomfort.
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| Building Envelope Leakage Paper (final_paper_378_-_sellers_-_envelope_leakage.pdf) |
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