Outline explanation of
Enepro21 World Edition
U.S. Patent No. US 8,396,605 B2

Overseas version simulation software that contributes
to the prevention of global warming.

E.I. Engineering Co., Ltd.
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1. Overview of Enepro21WE
Distributed power generation facility and centralized thermoelectric facility
・New design・Analysis of existing facility
・Energy saving analysis
・Equipment renewal

Software that can be examined efficiently
with high accuracy
Energy simulation Software

WE【Basic development philosophy】① Enepro21WE can flexibly respond to high-efficiency system design that matches
the energy load characteristics of the region.
② The annual operation of existing facility can be accurately reproduced, and this isused as the base case. Being able to make accurate energy-saving diagnoses andpropose renewals.
③ It should be "general-purpose technology software" that is easy for anyone involvedin energy to use.
④ Enrich Online-Help, publish formulas, and eliminate black boxes.

2【Basic structure】
Thermoelectric Facility

Set requirements

OutputPerform a simulation

Electric power, chilled water, hotwater, Steam and Warm waterload and the temperature
difference of heat medium

Energy consumption , operating
cost, Environmental load of CO2,
NOx, System COP, etc.

Setting main requirements① Thermoelectric load, outside air temp., outside air wet bulb temp.,
chilled / hot water supply temperature and return temperature.
② Setting of equipment configuration of thermoelectric facility③ Setting of equipment performance data, environmental load evaluation data,
charge data, weather data
④ Setting the operation pattern (operation priority) of the equipment
Based on these settings, you can run the simulation accurately on any system builtwith a typical system flow.
32. Features of Enepro21WE
Features 1. Accurately reproduce existing facility
The annual operation record of existing facility can be reproduced with high accuracy, and the difference between
the energy consumption by simulation and the energy consumption of actual facility can be within an error range of
1 to 2%. This can be achieved because the balance calculation of power, heat and flow rate can accurately
reproduce the operating state.
In the balance calculation, each energy balance influences each other's equipment, so the balance point is found by
the iterative calculation of each balance and the whole iterative calculation through all the balances at the sametime.

Balance calculation is calculated in the following order① Chilled water balance② Hot water balance③ Low chilled water balance④ Low Pressure balance⑤ High pressure steam balance ⑥ Warm water balance⑦ Power balance⑧ Exhaust heat balance

Regarding the balance of chilled water andhot water, not only the heat balance but also
the balance of the "flow rate" of chilledwater and hot water required for thesecondary air conditioner on the building side
is calculated to determine the number ofchillers required and the load factor.
4Features 2. Easily build the optimal thermoelectric system
By incorporating equipment into the general-purpose system flow, you can easily build an optimal system
for thermoelectric loads.

5In addition, the following items can be freely incorporated into the thermoelectric system toaccurately calculate the energy balance.
① Incorporate primary pump system, secondary pump system, free cooling system② Use seawater, river water, sewage, and groundwater as heat source water or cooling water③ Accepts and balances electricity, chilled water, hot water, steam and hot water from other facilities④ Calculation by incorporating photovoltaic power generation and solar heat utilization into thermoelectric facility⑤ Flexible operating that combines GE cogeneration and GT cogeneration
・ Power purchase control that does not cause reverse power flow
・Maximum power operation for the purpose of selling power・ Thermal main operation according to steam load
⑥ Arbitrarily set the priority of equipment that uses the exhaust hot water discharged from GE
You can freely set the heat utilization priority according to the load of Genelink, waste hot water recovery HE,
and hot water supply unit.
⑦ Flexible operation of heat storage system
・ Can handle heat storage and heat dissipation at the same time・ Heat storage operation during nighttime and daytime hours
・ Set the operation of the heat storage unit to 6 patterns of time zones
・ In principle, heat dissipation is the highest priority.
・ You can also perform heat dissipation operation according to the setting of operation priority.

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Features 3. Since the operating conditions can be set flexibly, the operation ofexisting facilities can be accurately reproduced.
① Set the operation priority of the equipment for each time zone according to the load pattern.
② The generated power can be set to the following supply destinations.
・ Supply only to the power load of thermoelectric facility・ Supply only to the consumer's power load
・ Supply both the consumer's power load in addition to thermoelectric facility③ Automatic COP correction when the chilled water outlet temperature is changed for eachrefrigerator④ Reflection of capacity decline and COP deterioration due to aging of chiller⑤ Set the cooling water outlet temp. of the cooling tower monthly⑥ Set monthly load factor for heat storage of heat storage inverter turbo chiller⑦ Set the heat storage efficiency of the heat storage tank monthly⑧ Cooling tower fan control settings: constant speed, pole conversion (4P⇔6P, 4P⇔8P),
inverter control➈ Pump control method settings: constant flow rate control, constant pressure control,
control valve control and inverter control➉ Combined operation of constant flow pump and inverter control pump
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Features 4. General-purpose technology software that can be easily
used by anyone involved in energy① System flow diagram enables visual system construction8

②

Automatic connection of device data related to the main equipment
The related equipment within the dotted line are automatically connected.
・chilled water pump, cooling water pump, and attached cooling tower

9Automatic pump setting, automatic setting function of attached cooling tower → Further
reduce user's trouble
・ Automatic pump setting: Automatic calculation of pump capacity and data input assist
function for pump efficiency based on JIS.
JIS＝Japanese Industrial Standards

・Automatic settings for the included cooling tower: Can be set automatically based on
equipment download data from the Enepro21 database.

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③

Other auxiliary functions are also enriched
・Automatic input function of enthalpy from steam pressure

・ Output the calculation result in Excel format → Create a report together with the outputof the graph
・There are many other useful features. For details, see "Enepro 21 operation explanation video".

④ Enepro21 database
It is prepared so that the equipment performance data required for simulation can be easily set.

A huge amount of performance data of more than
8,000 units has been collected from various
equipment manufacturers.
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⑤

Detailed online help function
Detailed online help is displayed for each window screen, and input methods andcalculation methods are also disclosed.
Gas engine help screen: Display flow model and calculation formula12

３．Introducing the Enepro21 database
Enepro21 utilization datacollection
Equipment performance data

Breakthrough system

WE Equipment utilization data collection

LogoutEnepro21 活用データ集のトップページ

When you download the necessary data from "Enepro21 Utilization Data
Collection" and import it into Enepro21WE, various equipment data areautomatically set.
When adopting Japanese equipment, it can be used as it is.
When using U.S. equipment, you can download similar equipment, build a system, and use it for priorconsideration of what kind of system is good before obtaining accurate equipment performance data from the
manufacturer. Once the user obtains the performance data from the equipment manufacturer, theperformance data can be overwritten and corrected for simulation to obtain accurate simulation results.
In addition, since the required performance data is overwritten, input errors are eliminated.

It radically solves the difficulty for users to obtain data and the time involved in entering data.
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【Equipment performance screen of inverter turbo chiller data imported to Enepro21WE】

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【Inverter turbo chiller load factor and COP graph】

Chilled7℃ COP

Chilled7℃ COP

Storage5℃ COP

Storage5℃ COP

Cooling water set to 15℃(Chilled water 7 ℃ mode, heat storage 5 ℃ mode)

Cooling water set to 20 ℃
(Chilled water 7 ℃ mode, heat storage 5 ℃ mode)
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①COP characteristics of inverter turbo chiller

・Load factor vs. cooling water temp. of 4 points or more
Set 6 sets of COP data (① ～ ⑥) and set COP characteristics
・Cooling water temperature is constant for each load factor
・As a general rule, the minimum load factor ⑥ is the lower
limit load factor for operation. Normally 20%
・The minimum cooling water temp. is the lower limit temp. forcooling water operation.
・In the case of an inverter turbo, the shape of the COPchanges greatly depending on the temperature of thecooling water.
Each load factor vs. COP is regressed with a fourth-orderpolynomial for each of the six load factors.

【Creating a COP graph for an inverter turbo chiller】
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The minimum operating load factor of a chiller is usually20%. When the load factor is 20% or less, it enters the
ON-OFF operation range in actual operation.
On the other hand, in power consumption calculation, it
is necessary to calculate even with a load factor of 20%
or less, so the ON-OFF operation state is simulated bycontinuous operation.
If the COP is extrapolated to a load factor of 10% or less,
the COP becomes very small and the power
consumption calculation may include a large error.
Therefore, the COP is assumed to be constant when theload factor is 10% or less.
In the power consumption calculation, select two
regression equations that sandwich the temperature of
the refrigerator cooling water at the time of calculation.
The COP of the cooling water temperature is calculated
by interpolation from the two COP values at the loadfactor during that period.

【Inverter turbo chiller COP graph】
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②COP characteristics of turbo chillers, absorption chillers, etc.

・Since the minimum operating load factor of a chiller is usually 20%, an ON-OFF operation is entered in actual operation at a loadfactor of 20% or less. On the other hand, when calculating power and gas consumption, it is necessary to calculate even witha load factor of 20% or less. The ON-OFF operation state is simulated by continuous operation, and the COP at that time isextrapolated to 20% or less of the regression equation.
・However, extrapolating the COP to a load factor of 10% or less results in a very small COP and a large error in calculating powerand gas consumption. A COP is considered constant if the load factor is 10% or less, as it may contain errors.
・The COP-cooling water temperature characteristic approximation method is created based on four points using a regression
equation of a quadratic polynomial.
・From these two formulas, the operating COP of the unit is determined from the cooling water temp. and the load factorof the unit.
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【Environmental load data loaded into Enepro21】

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③Electricity charge data

④Gus charge data

【Electricity / gas charge form on Enepro21WE】
Note) Japanese rate form

Enter contract power

The contract typeis displayed20

【Outside air temperature / outside air wet-bulb temperature data read into Enepro21WE】

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4 Calculation execution and output【Sample model system configuration
100,000 square meters)】(Complex building with a total floor area of22

5. Countermeasures for improper settings【View warning messages】
If the settings are incorrect or missing, a warning message will be displayed.
The warn function prevents you from doing the wrong simulation.
Case Study 1. Entered equipment priority and forgot to set outlet temperature

Case Study 2.

If the same equipment is set to equipment priority

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Case 3.

When there is an abnormality in the set temp. difference of the unit
Show warn for anomaly settings at the start of output calculation

The design temperature
difference of chilled water is 0Case 4.

When the capacity and number of units are insufficient for the loadWithout stopping the annual calculation, the unit set atthe end of the priority is automatically started andbalance calculation continues.
The time zone when it starts automatically is described
as a warn on the right side.
After completing the annual calculation, it is possible tomodify such as adding unit according to this warn orchanging the capability of the unit.

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6. How to use Enepro21WE
Familiarize yourself with Enepro21WE and think about various ways to prevent global warming.

① Analysis of existing thermoelectric facility
Create an annual load pattern based on one-year operation data↓
Analyze the performance of the equipment, enter the current performance, and enter the informationof the actual equipment operation pattern in the created annual load.
↓
Simulate annual energy consumption
・The difference between the simulation result and the actual energy consumption can be
reproduced within an error range of 1 to 2%.。
・Equipment performance and operation patterns accurately reflect the actual operation ofthermoelectric facility
・This case file that reproduces the current situation will be the base case for energy conservation
measures and system improvement studies.

② Re examination of equipment operation method① By comparing the result of the base case reproduced in (1) with the simulation result with various
settings changed, the following examination can be performed.
・Is the equipment properly allocated to the load?
・Are equipment with different capacities operated in the proper sequence of operations?
・Is the operation considering the relationship between the cooling water temp. and the unit efficiency and therelationship between the outlet temp. of the unit and the load factor?
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③ Consideration of facility renewal
Current status
reproduction resultsof existing
thermoelectric facility

Comparison

Simulation results byexchanging with equipment
scheduled to be renewed

Optimal equipment
selection is possible

The performance comparison of the equipment alone cannot
accurately reflect the operating conditions of the entire
thermoelectric facility, and the partial load characteristics,
cooling water temperature dependence of performance,internal power, etc. cannot be evaluated correctly.
Therefore, there is a big difference between the energy
consumption calculated by the equipment alone and the actual
consumption.

④ Verification after equipment renewal
Simulation of operation for
one year after equipment
renewalReplace only the renewed
equipment with the old one
Simulate operating for one year

You can quantitatively
calculate the difference inenergy consumption

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⑤ Examination of optimum operating and utilization for training of operators
You can consider the optimum operation of thermoelectric facility by following the steps below.
It can also be used to improve the skills of operators and to train them in operation.
１）

Create the actual thermoelectric load for the week.
Since the thermoelectric load program can set 8 patterns of load per month, input the loadfor 1 week in order from pattern 1 to pattern 7 on the set date.

２）

Connect the thermoelectric load program created in 1) to the case file created in advancein the base case.

３）

Set the actual equipment operation pattern and operation parameters for each pattern(setting date).

４）

Perform a simulation for each pattern (set date) and compare the energy consumption on
the set date with the simulation results to confirm that they almost match.
If there is a large difference, check that there is no difference in the operation pattern andparameter settings of the equipment, and correct it if necessary.

５）

It is possible to find improvement measures for operation by changing the operation pattern andparameters of the equipment for each pattern (setting date), performing a simulation, andcomparing and examining the actual operation results.
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7. Enepro 21 License Achievements and Patents① Approved by the Ministry of Land, Infrastructure, Transport and Tourism
Enepro21" is recognized as accurate simulation software by "Guidelines for calculating primaryenergy" when planning new construction and large-scale renewal of thermoelectric facility.

② License record
Enepro21 has been used by major Japanese companies such as major design companies, energy
companies, heat supply companies, equipment manufacturers, universities since 2008, and thesecompanies will greatly benefit from the design and analysis results by Enepro21.
・Nihon Sekkei.INC.
・Nikken Sekkei Ltd ・Kanden Energy Solution Co., Inc.
・International Petroleum Development Co., Ltd. ・Tokyo Gas Co., Ltd.
・ Tokyo Gas Engineering Solutions Co., Ltd., ・Kyudenko ・ Toho Gas Co., Ltd.
・ Daigas energy Co., Ltd. ・Tokyo Heat Supply Co., Ltd. ・Shinjuku Minami Energy Service )・OSAKA GAS CO.,LTD ・Takenaka Co., Ltd.
・Mitsubishi Electric Co., Ltd(Advanced Technology R&D Center)・ Shibaura Institute of Technology ・Yokohama National University ・ Kogakuin University③ Patent
Obtained domestic patent and US patent
Name "Simulation system for thermoelectric facility"

U.S. patent：US 8,396,605 B2④ Award history
・ 22nd SME Excellent New Technology / New Product Award
Software department
Received "Excellence Award" and "Environmental Contribution Special Award"
・ 7th Air Conditioning and Sanitary Engineering Society Promotion Award "Technology Promotion Award"
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Engineering
for Tomorrowwith Enepro21World Edition

E.I. Engineering Co., Ltd.