Heat pump installation Good Practice Guide

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Heat pump installation Good Practice Guide ( heat-pump-installation-good-practice-guide )

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4.5.2 Heater sizer worksheet (recommended method) More accurate heating requirement calculations can be determined by using the heater sizer in Table 4.4. (This is reproduced as a worksheet at the back of this guide). There are three stages: • Insert the climate region and design temperature from Section 4.4 and use it to determine Step (A). • Use the building information gathered in Section 4.3 and use it to determine Steps (B) to (E). • Calculate the heater size by following Steps (F) to (H). • For unusual buildings or high ceilings use the manual method in 4.5.3. Table 4.4 Heater sizer Climate Region: Design Temperature: Heater Sizer Factor (A) Climate index (B) Room type Bed, Hall (16°C): Dining (18°C): Lounge (20°C): (C) Insulation (select one) Very High: NZBC 2008 onwards: NZBC 1978–2007: Ceiling and/or floor insulation: Uninsulated: (D) Number of external walls One: Two: Three: (E) Window size in this room (% of exterior wall area) Small: ~ 25%: Medium: ~ 40%: Large: ~ 60%: Very Large: ~ 80%: (F) Total score = (A) + (B) + (C) + (D) + (E) = (G) Multiply room area ( ) x 8 [m2] (H) = (G) + (100) = Heater Size in Watts = (F) x (H) = °C Score Room 0 1 2 0 1 2 3 4 1 2 3 1 2 3 4 + + + + W 21

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