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Etichetă: energy efficiency

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When planning a replacement for HVAC equipment, you have three strategies available to ensure that the new equipment works as efficiently as possible.

By the time when most commercial building owners decide to upgrade their HVAC systems, cooling equipment, and boilers, existing equipment has been in operation for over 20 years. From a technological point of view in two decades, a lot of changes when it comes to high-efficiency systems, based on modern technology of building automation. That is why it is good for building owners to know a few strategies that will allow them to optimize HVAC equipment throughout their lifetime.

Most states have adopted an Energy Code – either the International Energy Conservation Code (IECC) or ASHRAE 90.1 – which stipulates the obligation to implement energy monitoring and conservation strategies for HVAC installations.

Low-cost and high-impact control measures needed to optimize HVAC equipment include:

  1. Optimize the on-off cycles of HVAC equipment

The objective is to save energy by creating start-stop cycles of the air conditioning equipment for the periods when the spaces in the building are not used (for example office spaces during the night). Since it is not at all easy to determine the right time to change the setpoints (reference temperature) of the equipment, and often there is no guarantee how hot or cold it will be in each space during that period, it is indicated that starting and optimum shutdown should be calculated for CTAs (Air Treatment Plants) and be automatically controlled by controllers (DDC).

This calculation is based on the difference between indoor and outdoor air temperatures. Sophisticated building automation systems, such as BMS, can “learn” the thermal need of a building to provide even more accurate programming for resetting temperature setpoints while maintaining optimal temperatures during the occupancy period.

  1. Reset the water temperature (cold/hot)

By changing the set point of chilled water, or the temperature value of hot water from boilers, a building will save a few percents of total energy consumption. The higher the supply of fresh air from the CTA, the higher the demand in the building for cooling or heating. If all the volts are partially closed, there is the possibility to change the set point of the chiller or boiler installation, respectively to make the temperature higher or lower, in the sense of saving energy.

If the temperature change is significant, the boiler or chiller will consume less but may require a significant increase in the consumption of the recycling pump to maintain the indoor climatic parameters. In general, chillers and boilers are the largest energy consumers in a commercial building. Ask the designer to evaluate the amount of energy the boiler consumes at different hot water supply temperatures, about the energy consumption for the pumps.

  1. Change the temperature and pressure setpoints

Modern CTAs with variable volume via DDC controllers are often required for both air temperature and pressure change. Changing the pressure, but also the temperature can be done by detecting how “open” the valves are, translating directly into how much cooling/pressure a particular season requires. The purpose of the pressure change is to reduce the fan speed in the CTA, while changing the temperature reduces the demand from chillers or boilers, to save energy.

When the valves are more than 65% open, significant changes in pressure and temperature will occur. Determine which system consumes the most energy and which modification ensures the largest savings, so that the controllers can handle the two changes properly.

As the energy requirements are updated every few years, it is advisable to ask the design engineers to consider how the latest energy code requirements can improve the efficiency of HVAC equipment. Many design engineers use an ROI calculated for less than five years, while HVAC infrastructure providers are confident they will work for 20 years.

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According to the study “Energy efficiency in Romanian companies” carried out by EnergyPal, in Romania, 69% of companies say they have not implemented a smart metering system for main equipment, 17% do not know, and only 14% took this step towards energy efficiency. This situation is present in 46% of respondents in construction & real estate, 77% in food & agriculture, 64% in industrial production, 70% in utilities & energy and 66% in transportation industry sector.

“The Energy Efficiency Study in Romania 2018 is based on our intention to disclose the up-to-date picture of how both the legislative framework and the companies’ performance objectives are reflected in this approach. Beyond the data and graphs it contains, the study indicates a relatively low level of awareness of the role that energy efficiency measures play in the company’s sustainable operation. We will continue to conduct this study in the years ahead, from the current pilot version to a more elaborate version, to give even more value to its content,” says Lucian Anghel, Founder and CEO, EnergyPal Romania.

Most of the respondents (62%) say that energy efficiency means the ratio between performance, service, goods or energy and the energy used for that purpose. On the other hand, only 14% identify this concept with the capability to perform an action with minimal energy consumption.

The current level of consumption monitoring

In 55% of companies the current consumption monitoring level in the company is only achieved through a general utility meter, 34% have manual readings internally. Only 17% have detailed internal readings with automatic reading, and 7% have exportable consumption data in Excel. Only in 7% of companies we find integrated energy consumption with production monitoring.

Policy to reduce energy loss

It is somewhat gratifying that 66% of respondents say they have a policy of reducing energy loss within the company. At industry level, such a policy is 41% of professional service companies, 46% of financial services, but 66% of industrial production sector.

Policy to have cost-effective utilities

Not less than 7 out of 10 companies, of the respondents, say they have a policy to increase efficiency of the utility costs. At industry level, the best situation is in the industrial production sector (67%), followed by the construction & real estate industry (64%) and the utilities & energy industry (58%).

Assigning the role of Energy Manager

If 38% of the respondents say they have a responsible person in the company that deals with the energy efficiency plan (energy manager), the fewest companies with such a role are from transportation sector (17%), followed by production industrial (22%) and food & agriculture (26%) industry sector.

Programs to drive energy efficiency

Only 3 out of 10 companies say they have invested in a program aimed at driving energy efficiency. At the industry level, the fewest companies with such investments are in construction & real estate (20%), followed by food & agriculture (29%) and professional services (32%) industry.

Unfortunately, 31% of the industrial production companies are not aware of the obligations of the economic agents according to Law 121/2014 on energy efficiency, and the percentage rises to 50% in the case of construction & real estate.

“In most cases, facility management actions intersect with those of improving the energy efficiency of buildings. Buildings need both sets of services, integrated into a coherent operating program. This can provide additional benefits in terms of reliability and sustainability, as well as a higher use experience for end-beneficiaries. In future editions of the study, we will also focus on the synergy that integration of both types of services brings about and the specific ways in which companies that have this strategy have additional benefits,” says Alexandru Theodor Miculaş, Head of Facility Management Services, FMS Romania, co-author of the study.

You can download our study from here:

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About the survey

The EnergyPal survey explores the perceptions of executives and managers about the barriers and benefits of energy efficiency in companies in Romania. The questionnaire, which received 175 responses, was applied between 10 February 2018 and 30 March 2018. Energy efficiency refers to how companies can get the same benefit (light, heating, movement) using less energy. The monthly consumer average used by respondents is as follows: 21% at 100 euros – 1000 euros, another 21% between 10,000 euros – 25,000 euros and 41% over 25,000 euros. 41% of respondents come from companies with a turnover of more than EUR 100 million, 14% of companies with a turnover of EUR 50-100 million, 7% of companies with a turnover of EUR 10-50 million, 21 % with turnover between EUR 2 and 10 million and 17% below EUR 2 million turnover. 27% of the respondents are CEO / President / Chief Executive Officer, 7% Vice-President / Executive Director, 19% Administrative Director, and 17% Technical Director.

About EnergyPal

The founder of the EnergyPal brand, dipl.ing. Lucian Anghel, has a vast experience in operating and maintaining buildings over 3,000,000 sqm in Romania. The experience gained over 15 years of facility management has led to launching EnergyPal, an energy efficiency concept, whereby customers benefit from the most cost-effective solutions for building operation costs. The EnergyPal team is staffed with over 8 years of experience in facility management and technical assistance. The staff is specialized in the fields of: smart metering, HVAC (heating and air conditioning), automation, insulation, lighting, preventative and predictive maintenance. The solutions and technologies used have the effect of reducing the operating costs of the beneficiaries, which allows for the financing of the savings made. Learn more about us on: www.energypal.ro.

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