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HIU's with PID Controlled Pressure Independent Control Valves (PICV)

Electronic control provides a smart and efficient district or communal heating system

Your choice of Heat interface Unit (HIU) is a crucial element of the system design

With advances in technology and growing experience in system design, improved methods of controlling HIU’s and the primary network are available.

How does electronic control work?

Using advanced Proportional Integral Derivative (PID) control logic, in combination with PICV’s and a fast acting actuator, the primary flow rate modulates to match the DHW or HTG demand and responds instantly to the changing loads. This ensures that end user comfort is achieved by providing consistent, safe hot water at the tap, as well as guaranteeing the low return temperature to the primary network at all times.

The use of PID controlled PICV’s in HIU’s means that only one valve is required for differential pressure control, flow modulation and full energy shut off. This reduces the size and weight of the unit, keeps maintenance costs to a minimum and increases functionality. In addition, Evinox Energy HIU’s are supplied prepayment ready with a room controller meaning there is no requirement for additional controls, sensors or equipment to provide remote monitoring of temperatures and flow rates or to switch the end user to a debt free Pre-Payment system.

PICV’s alone are not the answer

The innovations in Pressure Independent Control Valve (PICV) technology have led to an increase in their use within Heat interface units. Whilst there are a number of HIU’s available that feature PICV technology, it’s vital that they are correctly controlled, and Evinox Energy recommend the use of fast acting actuators and a tailored PID control logic. Failure to size or control PICV’s correctly will result in a reduced level of comfort for the end user and a potentially less efficient primary network.

Electronically controlled HIU’s can offer many additional benefits:

  • Electronic control can be used to facilitate a 2-way communication network, which enables the heating and hot water system in each dwelling to be remotely metered, controlled, interrogated and tested. The alternative to this is a physical inspection of the HIU, where access to the dwelling is required. This can be inconvenient and incurs costs.
  • DHW or HTG set-points can be altered remotely after the HIU’s have been commissioned, which allows the system operator to maximise the efficiency of the whole system.
  • Provides extra comfort for the end user as support is available to change their settings to holiday mode or adjust the comfort mode settings via the internet.
  • When our PaySmart pre-payment system is used, the PICV’s allow for the automatic disconnection of the heating and hot water when there is insufficient credit, as they also act as the energy shut-off valve. This removes the requirement to fit any additional external shut-off valves and the associated cost and installation time.

We are confident that the future of HIU’s lies in electronically controlled units that provide full comfort to the end user, whilst also delivering important information regarding the operation of the system, which can be monitored, adjusted or regulated remotely over the internet.

To achieve the same result using a mechanically controlled HIU, additional equipment may be required such as – an energy shut of valve, credit display device, temperature sensors and flow sensors connected to the BMS or EMS system.

Electronic control provides a smart and efficient district or communal heating system, with reduced installation costs due to the integrated technology within the HIU, meaning no additional equipment is required.   

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Heat Interface Units

Our range of ModuSat® eco-efficient heat interface units (HIU’s) have been designed to provide apartments and communal housing developments with independent fast recovery hot water and high efficiency heating.

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Communal & District Heating

A communal or district heating system supplies heat to a number of dwellings from a common heat source. It may comprise of, for example, a system heating a block of apartments or a larger scale system heating many buildings.

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Solutions for M&E Consultants

Our products and design principles meet the energy efficiency requirements to support modern heat networks. We work closely with consultants to provide advice and support when selecting equipment, and ensure successful project delivery.

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