Sizing of summer air conditioning system

Sizing of the summer air conditioning system

Program for calculating the sizing of a centralized summer air conditioning system with a single coil for cooling and heating and a post heating coil (electric or hot water) – By entering a few data, the document automatically calculates the salient components of the system - Calculate the total air flow rate and in each individual room, the potential of the heat pump refrigeration unit, the flow rate of the electric pumps, the size of the inertial tank, the potential of the post heating batteries (electric or hot water) and the size of the winter humidifier - There are summary drawings showing the results.

We are pleased to present our advanced design program for air conditioning systems, designed to offer optimal solutions for thermal comfort in indoor environments during hot summer days.

The importance of an efficient and effective air conditioning system cannot be underestimated, as it contributes significantly to the well-being and productivity of building occupants.

Make planning easier

Our program was developed by Itieffe to simplify the design process, allowing engineers, architects, heating engineers and industry experts to create tailor-made solutions based on the specific needs of their projects.

Meeting the challenges of reducing heat and humidity efficiently requires careful planning, and our free program is here to guide you every step of the way.

Through an intuitive and easy-to-use interface, you will have access to key parameters such as internal and external temperatures, room dimensions, the necessary heating load, the necessary quantity of air for all-air recirculating systems and more.

The sophisticated algorithm will work for you, generating optimized design proposals that take factors into account. At the end of data entry, summary drawings will complete the work.

We invite you to explore our summer air conditioning design program to offer your customers and building occupants a cool, pleasant and productive environment. We are excited to accompany you in the implementation of advanced solutions for thermal comfort during the summer seasons.

Sizing of the summer air conditioning system

Quick calculation for the sizing of a centralized summer air conditioning system with single battery for cooling and heating and post heating coil (electric or hot water).

By entering a few data, the elaborate automatically calculates the main components of the system.

Calculates the total air flow rate and in each individual environment (both for full-air and recirculation systems), the potential of the heat pump cooling unit, the electric pumps, the buffer tank and the post-heating batteries (electric or hot water) and the size of the winter humidifier.

Take some time

Taking a little time to understand how it works will be rewarded.

Finally, two summary drawings are drawn up for an all-outdoor system and a system with air recirculation.

There are detailed instructions and demonstration videos.

Enter all the data in this section

Summary sheet of results

The only modifiable data in this section are: delta t (Δt) - EER

Depending on the type of system chosen (all air or with recirculation), you go to the selected sheet for examining the data.

Instructions for Use

Sizing of the summer air conditioning system

Apparently the “Summer air conditioning system” program may seem complex but with a little familiarity it can become a valid aid for the construction of air conditioning systems with both recirculation and all external air.

We do not pretend that it is used regardless but, as a verification of studies carried out with other systems.

Its simplicity makes it very flexible for any summer air conditioning system calculation and it can also be used in winter by replacing chilled water with hot water (the battery calculated for cold is usually higher than that calculated for heat).

Let's see how to proceed for a "with air recirculation" system

Without going into the merits of complex calculations to calculate the heat recesses of the building (treated in other documents on this site and which can be integrated in this program in the INSOLATION TRANSMISSION> free insertion line), we enter the choice of the type of construction through the menu drop-down (1) among the items indicated.

We choose the type of system (2) between “with air recirculation” and “all-outside air”.

We insert the “Project data” of temperature, humidity (3) and atmospheric pressure (4).

The indications of the project (5).

Using panel 6 (if you are in Italy), you can enter the location with the suggested directions.

Enter the winter data (7).

Let's enter the data of each single environment starting from the destination and the dimensions (8).

We insert the coefficient detectable by: PEOPLE> Activities carried out sheet and We indicate the people present on average within the environments (9).

In the panel (10) “Watt internal loads” choose between fluorescent, Incandescent or Led lamps.

Insert the other types of electrical loads present in the room.

In this case there is also the possibility to freely insert the foreseen loads bypassing the automatic calculations (Free insertion).

In section (11) “Insolation Transmission” insert in sequence: the exposure, the type of ceiling and what exists under the floor.

Here too there is the section for free insertion to be used if you use the dedicated program on this site (publication soon).

In the panel (12) it is possible to insert the latent heat that can be detected in the environment (in the case of generators, etc.).

Section (13) indicates the sensible and total heat values to be subtracted in each individual room.

In the “Calculation of outdoor air” (section 14) you can choose between: changes now em³/ h per person of the required amount of air (see dedicated sheets linked to the links at the beginning of the program under the heading Useful tables).

Here, too, you can make free entry.

We are done with data entry.

Let's analyze the sheet containing the results with "Air recirculation"

The cell "with air recirculation" must be green otherwise the data are for an "all-air" system and vice versa.

For the calculation of the primary water circulation electric pump, the Dt must be indicated which in the case of cold water is normally equal to 5 ° C.

For the refrigeration unit, enter the EER (Energy Efficiency Ratio) which is normally indicated by the manufacturer. It is a pure number that oscillates between 2.4 and 3.0 (the higher it is, the more performing the machine).

The plant was calculated; you don't need to enter anything anymore.

Let's analyze the data shown in the drawing

the pump must have a flow rate of 13.5 m³/ h (1)
the refrigeration unit must be 78 kW (thermal) and will absorb a power of about 30 kW, the current will be 57 A at 400 V and 104 A at 220 V. (2)
for each room the following are respectively indicated: the cubic meters, how much air is needed with also the indication of the external one, how many Watts must be subtracted from the room and finally how many kW the post-heating coil must be, (3)
the buffer tank capacity (indication also of the minimum expected one) (4)

how much external air the air handling unit must treat and how much recirculated air. (5)
the total air flow of the air handling unit with the indication of the recirculation and spare parts hour (6)
the potential of the chilled water coil (7)
the potential of the post-heating coils starting from that on the delivery of the air handling unit and the environmental ones (8)
the sizing of the humidifier in kW and its producibility in grams of steam per hour (9)
The summary of the cubic meters to be conditioned with the Watts to be subtracted from the square meter. (10)

To calculate an all-air system, the procedure does not vary.

good job

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Sizing of the summer air conditioning system

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