6/11/2023 0 Comments Heating load per m2 thumb![]() Ī strong relationship between peak loads and annual loads that is typically only the case for envelope-dominated buildings in a given location.Therefore, rules of thumb that try to relate the size of GHE to the peak loads are destined to fail, unless certain special conditions are present. ![]() This rise or fall over time has nothing to do with the peak load and everything to do with the annual loads. ![]() Practically speaking, this may mean that the heat pump EFT rise (or fall) over time so that each year's peak EFT is greater than the last, with the greatest change coming in the first three or four years as shown in Fig. 2.7. The time constant of the ground surrounding a commercial GHE is typically on the order of years. ![]() This is primarily related to the long time constant of the ground surrounding the GHE as well as the highly variable relationship between peak heating and cooling loads and annual heating and cooling loads. Although such rules of thumb are highly desired by practitioners and there have been a number of such rules of thumb promulgated, there is little possibility for rules of thumb to adequately design GHEs for a wide range of commercial buildings ( Underwood and Spitler, 2007 Spitler and Cullin, 2008). Rules of thumb relate GHE length to building peak heating or cooling loads or to installed capacity of equipment, typically expressed as W/m or ft/ton.
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