Production

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The production of cold/heat of a building is the great consumption of this, and therefore, if we automate it in an optimal way, it can represent a potential energy saving. Inside the production section, we also take into account the conditioning of the outside air towards the interior of the building.

The whole production is subject to the summer / winter mode of the general control, as well as the selector switch and schedule of the same.

Each pump and electrovalve element has a selector switch (Manual / Stop / Automatic) to directly govern the equipment, for maintenance tasks and solutions of possible incidents that may appear.

Following there is a list of possible improvements in each of the different elements involved:

Air conditioners

They control the supply of primary air to the installation. The regulation of primary air conditioners has a direct impact on the energy efficiency of the building, as they are a large consumer of refrigeration and heat power.

If, for example, we have free-cooling gates for air renewal, and we install a CO2 sensor on the return of the installation, we can control the gates, both by temperature and by CO2. We will only renew air when the conditions of temperature are favorable to us, or when the level of CO2 in the environment is deficient.

Another possible improvement in air conditioners is the regulation of the motors of the impulse and return fans by means of a drive, depending on a sensor of differential pressure of air.

To finish, another useful system, is to have dirty filter indicators, because a dirty filter implies an increase in the electrical consumption of the installation.

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Heat Production

In heat productions, energy can also be saved, for example by modulating the boiler's set-point temperature to the required temperature at any given moment (less outside temperature will increase the temperature), or compensating for internal ambient temperatures (if environment that we are heating, is close to the desired internal temperature setpoint, we can decrease the temperature of impulsion).

This double regulation of temperature is also applicable when we have a boiler without possibility of changing temperature setpoint, but we have mixing valves to lower the temperature we drive to the circuits.

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The following screen would be an example of temperature curve of impulsion as a function of outside temperature:

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Cold Production

In cold production, it is possible to control the impulse and return temperatures of the machines, to indicate an alarm if one is not cooling properly, and on the other hand, in case of having several machines, we can cicle in order not to have all of them active at the same time. An important saving is to adapt the chillers that we will have running according to the demand of cold that is being used (not having the large chiller running, if the consumption during the nights is minimal...).

The majority of chillers can be questioned using lonworks, bacnet or modbus protocols, so they will let us know all their control variables such as temperatures, pressures, setpoints, alarms, etc.

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