What does 'Bivalent' mean in the context of heat pump systems?

_________: A large volume of water that either provides additional volume for a heating system (volumiser) or as a means of decoupling the flow rate between the heat pump and emitter circuit (buffer). Buffers can also serve as volumisers.

_________: A sealed polyethylene (MDPE or HDPE) series of pipework which usually contain glycol antifreeze. For example, a horizontal ground collector, slinky or borehole U-tube system.

_________: A pre-fabricated “panel” consisting of an array of collection pipework arranged in a ladder or similar format.

A component which allows the transfer of heat from one circuit to another without the two circuits mixing. This could be a plate to plate, shell or tube design.

Pipework forming the Closed Loop Collector (Normally Vertical).

_________: Pipes laid in a loop formation and buried up to 2m deep in open ground. The pipe is usually made of polyethylene (MDPE or HDPE) and contains a glycol antifreeze solution as the heat transfer fluid.

A system where all of the energy required for the heat load of the building is provided by the heat pump.

_________: This uses ground water taken from one area of a borehole, stream or lake, pumped through a heat exchanger, then expelled to the environment a few degrees colder further downstream or into another borehole (outside the scope of this manual).

_________: A type of closed loop collector that utilises a coiled polyethylene pipe (MDPE) that remains in coiled formation in the ground. It is buried at depths of up to 2m.

Which part of the system is responsible for extracting energy from the ground or air?

According to the text, what is the expected average year round temperature at around 15m deep in the UK for ground source heat pumps? The expected average year round temperature is ______ °C, dependant on location in the country.

What is the minimum depth at which the collector loop is buried?

What is a critical factor to consider when sizing the collector circuit for ground source heat pumps?

Fill in the blank: The higher the temperatures from the heat pump, the COP or efficiency of the heat pump will be considerably ______ than when the heat pump has lower flow temperature.

According to the text, what should be considered prior to the installation of a heat pump to help keep running costs to a minimum whilst maintaining a level of comfort for the consumer?

What standard should any calculation method used for building heat loss be based on?

Which of the following is a factor to consider during the installation of a heat pump system?

Fill in the blank: FGAS Regulations cover the use of ________ in commercial, industrial, and public sector organisations.

Which category for working with F gases allows you to carry out all activities?

Which refrigerant type has the lowest practical limit (kg/m³) according to the table?

What is a Bivalent system? Fill in the blank: A Bivalent system is where part of the heat load is met by the heat pump and the remainder by an additional energy source, i.e. solar thermal panels, bio fuel, oil or gas boiler etc. Where a Bivalent system is to be installed it must always be designed to give the least ________ intensive fuel source priority.

Which of the following statements is true about Air Source Heat Pumps?