Water Source Heat Pump Loop Design

Water source heat pump applications utilize low system return temperatures and most boiler designs such as cast iron and smooth tube cannot operate with system temperatures below 140 f without condensing.

Water source heat pump loop design. The water supply may be a recirculating closed loop or a once thru system using water from a well a pond or a stream. Cp3 and cp2 for open loop groundwater source heat pumps and surface water heat pump systems respectively. The piping loop s begin and end at the heat pump. Heat is moved through an interconnected water loop and either rejected through a cooling tower or put to work in other areas.

In addition unlike ground source heat pumps water source heat pumps do not require trenches for coils to be laid in although open loop systems often require filtration. The chiller condenser water heat is recovered instead of being rejected to the outside and used as a heat source for a water source heat pump system serving the perimeter spaces. The closed water loop provides condenser water to the interior zone cooling units picking up the heat normally rejected to a cooling tower and transferring it as the heat source evaporator load for the perimeter zone heat pumps. Each unit is individually packaged and relieves the stress of having the building rely on one hvac unit to.

Each unit is an independent packaged system eliminating the chance of a total system failure. They can be open loop or closed loop systems. A water source heat pump extracts heat from the water when in the heating mode and rejects heat to the water when in the cooling mode. When a non condensing boiler condenses soot is formed which builds up on the heat exchanger and burners and reduces its thermal efficiency.

The water loop is piped through a building and each heat pump is connected individually. Simple in design a wshp rejects heat in the cooling cycle through a cooling tower loop. One of the most efficient and reliable hvac systems for your building is a water source heat pump wshp. As the most energy efficient hvac systems on the market water source heat pumps wshps are uniquely simple in design.

Water for closed loop heat pumps is usually circulated at 2 25 to 3 00 gpm per ton of unit cooling capacity. Topics include the latest technologies being used in heat pumps design and control of the water distribution loop and dedicated outdoor air system ground source systems and a review of the requirements in ashrae standard 90 1 that apply to wshp gshp systems. The design and installation of ground source systems should be undertaken with care and attention. Water source heat pumps require a suitable local water source such as a lake river well borehole and so on.

Open loop systems can present particular challenges and will require the services of a specialist. Once filled with fluid and purged of air nothing enters or leaves this closed loop system. Water source heat pump wshp and ground source heat pump gshp systems.