This rough rule of thumb on air infiltration rates works pretty well for averages of large samples of homes, yet for a single home, it is not very reliable. For example, the average air infiltration rate at 50 Pascals of 35 passive solar homes monitored by SERI was 11.1 ACH. The average...
Calculations for air-conditioning designD.R. OughtonS.L. HodkinsonFaber & Kell's Heating and Air Conditioning of Buildings (Ninth Edition)
Air conditioning manufacturers may suggest different multiplying factors to use when making rule of thumb calculations. Some sources, for example, will suggest multiplying the square footage by 25 to get the base cooling load estimate, so be aware of this as you do your rough estimation. Online ...
The question is very on point; a rule of thumb is to add 4,000 BTU for the kitchen because people who have kitchen usually use it (kitchen appliances, oven, stove, even fridge all create surplus energy). There is nothing in the nature of the kitchen itself that would call for a more...
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California and Florida have long required the proper design calculations be performed due to more stringent building codes. I am hearing daily of other areas, in other states, finally seeing the value in proper hvac design. The days of "Rule of Thumb" design are coming to an end! Hallelujah...
(0.57 ± 0.01 compared with 0.61 ± 0.03). This is close to the suggestion in Numerical Data for Air Infiltration and Natural Ventilation Calculations [41] that this exponent is typically 0.60, but with a range of ±0.1. Alfano et al. [16] foundnto be 0.60 ± 0.035 for 20 Italian ...
Recent research has shown that the energy consumption of commercial and residential buildings is responsible for approximately 40% of the total energy consumption [2]. The amount of energy used in heating, ventilation, and air-conditioning (HVAC) systems accounts for almost half of the energy ...
Being powered by electricity from the grid, the PCA unit will dramatically reduce the on-site emissions and noise pollution. As a rule of thumb, let’s consider that a single narrow body aircraft running its APU during one hour every day produce in excess of 100 tons of CO2 in one year...
Size, in air conditioning terms, doesn’t refer to the physical size of the system. Rather, it’s gauged in tons or BTU’s per hour (12,000 BTU/hr. is equal to one ton of cooling capacity). Why is this important? Because, the larger the system, the more it costs. And remember ...