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 Step 3: Calculate heat load requirement Using the information from Steps 1 and 2, you can now calculate the heat load requirement for the heat pump system. There are three ways you can do this: • a simple estimate • a heater sizer worksheet (recommended method) • a manual calculation. Case studies for sizing heat pumps in three different locations are given in Section 12. 4.5.1 Simple estimate A commonly used rule of thumb for estimating heat load requirements is based on Table 4.3. Table 4.3 Simple guide to determine heat load requirement However, this method leaves no provision for any variables such as solar gain, increased levels of insulation, reduction of air leakage and so on. Insulation Method 1: Estimate by area (W/m2) Method 2: Estimate by volume (W/m3 – based on 2.4 m ceiling height) Non-insulated 150 65 Insulated 120 55 20

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