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Фрагмент инструкции
Moisture removal capabilities In addition to the amount of air being exchanged, moisture removal depends largely on the moisture content of both the inside and outside air. The trends below outline these principles. • The higher the indoor relative humidity, the larger the moisture removing capabilities. • The higher the indoor temperature, the larger the moisture removing capabilities • The lower the outdoor temperature, the larger the moisture removing capabilities. Detailed Calculation of Total Ventilation Requirements The following charts and equations can be used to accurately size the HRV for a indoor pool application. At this time some decisions should be made with regards to: • Pool water temperature • Indoor air temperature • Relative humidity It should be noted that the construction and quality of materials used in the construction of the pool room will influence the size of HRV required. High quality windows such as triple glazed, argon filled will allow a higher indoor humidity level before condensation will occur. A pool room built with loose construction techniques will have a higher natural ventilation rate than that of a room built to higher standards. It is recommended for all applications it is assumed there is no natural ventilation. The first table contains the evaporation rate of water based on the water temperature, room temperature, and room relative humidity. The second table contains the flowrate factor based on the indoor temperature, outdoor temperature, and room relative humidity. The total ventilation rate per square foot of water surface area is the result of these calculations. The total ventilation rate is this product multiplied by the water surface area. 6 Calculation Note: As a general rule, if the water temperature is maintained at 80°F and the pool room air temperature is maintained at 82°F, use a factor of 1 cfm/sq ft of pool surface or .5 cfm/sq ft of room area (whichever is greater) to determine amount of ventilation required. Example: Pool surface area 16’ x 32’ (512 sq ft) *Indoor design air temperature 83 °F Pool water temperature 81 °F Relative Humidity 50 % *Outdoor design air temperature 15 °F * Always use design temperatures for indoor and outdoor air temperatures. Outdoor design temperatures are published by organizations such as ASHRAE. Do not us day to day temperatures for this calculation. 1. From Table 1, select the appropriate evaporation rate based on the room air temperature, water temperature, and relative humidity. Evaporation Rate = 0.052 2. From Table 2, select the corresponding flowrate factor depending on the indoor air temperature, outdoor temperature, and room relative humidity. Flowrate Factor = 21.70 3. Multiply the values obtained from step 1 and step 2 to obtain the minimum CFM required per square foot of pool surface area. Evaporation rate X Flowrate = CFM / square foot of water surface area 0.052 X 21.70 = 1.12 4. Multiply the value in step 3 by the area of the pool Area of pool X Value for step 3 = CFM 512 X 1.12 = 573 System Installation It is necessary to design and size the duct distribution system for both the supply and the exhaust air streams. Proper duct design will • Minimize air flow requirements • Ensure a comfortable environment by using reheat if required • Optimize humidity control, including eliminating condensation on windows by blanketing the windows with airflow Please refer to sketch 1 and 2 for typical duct layouts. 7 TABLE 1 Evaporation Rate Indoor Relative Humidity 40% 50% 60% 40% 50% 60% 40% 50% 60% 40% 50% 60% 40% 50% 60% 40% 50% 60% Evaporation Rate lb/(sq. ft-hr.) 68 0.069 0.063 0.056 0.079 0.073 0.066 0.090 0.084 0.077 0.102 0.095 0.089 0.115 0.108 0.102 0.129 0.122 0.116 70 0.068 0.060 0.053 0.078 0.070 0.063 0.088 0.081 0.074 0.100 0.093 0.086 0.113 0.106 0.099 0.127 0.120 0.113 72 0.065 0.058 0.050 0.075 0.068 0.060 0.086 0.079 0.071 0.098 0.090 0.083 0.111 0.103 0.096 0.125 0.117 0.110 74 0.063 0.055 0.047 0.073 0.065 0.057 0.084 0.076 0.068 0.096 0.088 0.079 0.109 0.101 0.092 0.123 0.115 0.106 76 0.061 0.052 0.043 0.071 0.062 0.053 0.082 0.073 0.064 0.094 0.085 0.076 0.107 0.098 0.089 0.121 0.112 0.103 78 0.059 0.049 0.039 0.069 0.059 0.049 0.080 0.070 0.060 0.091 0.082 0.072 0.104 0.095 0.085 0.118 0.109 0.099 80 0.056 0.046 0.035 0.066 0.056 0.045 0.077 0.067 0.056 0.089 0.079 0.068 0.102 0.091 0.081 0.116 0.105 0.095 82 0.053 0.042 0.031 0.063 0.052 0.041 0.074 0.063 0.052 0.086 0.075 0.064 0.099 0.088 0.077 0.113 0.102 0.091 84 0.050 0.039 0.027 0.060 0.049 0.037 0.071 0.060 0.048 0.083 0.071 0.060 0.096 0.084 0.073 0.110 0.098 0.087 86 0.047 0.035 0.022 0.057 0.045 0.032 0.068 0.056 0.043 0.080 0.068 0.055 0.093 0.080 0.068 0.107 0.094 0.082 88 0.044 0.031 0.017 0.054 0.041 0.027 0.065 0.052 0.038 0.077 0.063 0.050 0.090 0.076 0.063 0.104 0.090 0.077 78 81 84 87 90 93 8 TABLE 2 Flowrate Factor Indoor Relative Humidity 40% 50% 60% 40% 50% 60% 40% 50% 60% 40% 50% 60% 40% 50% 60% 40% 50% 60% F...
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