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Heat Pumps Technology Guide

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Heat Pumps Technology Guide ( heat-pumps-technology-guide )

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Heat Pumps Technology Guide SEAI 3.2.5. Shared ground- or water-source system It is possible to connect multiple heat pumps to the same ground- or water-source system. This means that several buildings (or heat loads within a building) can share the source system and have individual heat pump and heat distribution systems suited to each building. Unlike heat networks, there is heat lost via the source pipework between buildings. Integrating heating and cooling loads into one source system can maximise energy efficiency through heat recovery, maximise the efficiency of the heat pump systems, and minimise the size and cost of the source array. Such systems have complex heat flow arrangements that will require software simulation of the loads to be met and the source system. You should seek professional engineering advice. 3.2.6. Other considerations Intermediate brine loop On some open loop systems, an intermediate hydraulic loop is inserted between the heat pump and the open loop system. This protects the heat pump from the effects of freezing (if there is a lack of circulation and the heat pump does not turn off in time) and from being damaged by debris in the water. However, the intermediate circuit lowers efficiency, because the additional heat exchanger reduces the temperature in the evaporator by several degrees. Cooling Water-source heat pumps can be suitable for cooling in the same way as ground-source systems are (see the discussion in Section 3.2.1.). Large water-source systems that have open loop systems from the sea or a major river can have a much larger cooling capacity than similar ground-source systems. 3.3. Air-to-air There are air-source heat pump systems that can provide heat directly to air instead of through a water-based heat distribution system. These are often used for cooling (as air-conditioning systems) and are usually split or multi-split systems. This guide does not cover air-to-air heat pumps. 17

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