Water Source Heat Pump Loop Design

One of the most efficient and reliable hvac systems for your building is a water source heat pump wshp.

Water source heat pump loop design.

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. Heat is moved through an interconnected water loop and either rejected through a cooling tower or put to work in other areas. The water supply may be a recirculating closed loop or a once thru system using water from a well a pond or a stream. 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.

Water for closed loop heat pumps is usually circulated at 2 25 to 3 00 gpm per ton of unit cooling capacity. Water source heat pump wshp and ground source heat pump gshp systems. Each unit is individually packaged and relieves the stress of having the building rely on one hvac unit to. When a non condensing boiler condenses soot is formed which builds up on the heat exchanger and burners and reduces its thermal efficiency.

From one medium to another. As the most energy efficient hvac systems on the market water source heat pumps wshps are uniquely simple in design. Once filled with fluid and purged of air nothing enters or leaves this closed loop system. The piping loop s begin and end at the heat pump.

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. The water loop is piped through a building and each heat pump is connected individually. In combination with the heat pump s water to refrigerant heat exchanger they form a closed loop piping system. Open loop systems can present particular challenges and will require the services of a specialist.

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. The design and installation of ground source systems should be undertaken with care and attention. Simple in design a wshp rejects heat in the cooling cycle through a cooling tower loop. Each unit is an independent packaged system eliminating the chance of a total system failure.

The closed loop water source heat pump concept provides an extremely simple highly flexible and unusually reliable semi decentralized system approach to year round space conditioning of multi room buildings. They can be open loop or closed loop systems. 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.