Coldroom Cooling pipes Hydraulic piping Refrigerant rule Refrigerant charge limit Psychrometry Setup About Calcooling
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About Calcooling

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Setup

Preferencies

Psychrometry

Propiedades del aire húmedo

ºC
%
m
atm
kg/kg
ºC
kJ/kg
ºC
kg/m³
kJ/kg·K
W/m·K
µPa·s

Refrigerant charge limit

Load limit

Type of premises
Refrigeration system
m²
m
m³
System location according to art. 6.2:
  • Type 1: All parts of the system containing refrigerant located in an occupied space.
  • Type 2: System with compressors, containers and condensers in machine room or outdoors .
  • Type 3: All parts containing refrigerant located in the engine room or outdoors.
  • Type 4: all parts containing refrigerant inside a ventilated enclosure .
Primary refrigerant
Refrigerant safety class:
  • A1: Low toxicity and non-flammable,
  • A2L: Low toxicity and very slightly flammable,
  • A2: Low toxicity and slightly flammable ,
  • A3: Low toxicity and High flammability,
  • B2L: High toxicity and slightly flammable.
kgeq.CO2/kg
Acute toxicity exposure limit (ATEL) or oxygen deprivation limit (ODL), whichever is lower.
kg/m³
Determined in accordance with 5.2 of UNE-EN 378-1: 2017.
kg/m³
kg/m³
Load limit
kg
Permissible flammable load limit for air conditioning systems and heat pumps, in the application for human comfort, in accordance with RSIF 2019 IF04 Appendix 3.
Charge limit based on the flammability of the refrigerant, according to RSIF 2019 IF04 Appendix 1, table B.
Charge limit based on the toxicity of the refrigerant, according to RSIF 2019 IF04 Appendix 1, table A.
The systems will be positioned so that a refrigerant leak does not penetrate aeration holes, doors, hatches or the like. where there is a possibility that the refrigerant may stagnate, detection and ventilation systems should be provided, according to RSIF 2019 IF04 3.3.2.
Safety requirements for machine rooms must be applied, according to RSIF 2019 IF07.
As of January 2020, the use of HFC refrigerants with a GWP equal to or greater than 2500 in refrigerators and freezers for commercial use is prohibited.
As of January 2022, the use of HFC refrigerants with a GWP equal to or greater than 150 in refrigerators and freezers for commercial use is prohibited.
As of January 2020, the use of HFC refrigerants with a GWP equal to or greater than 2500 in fixed refrigeration appliances is prohibited, except devices designed for applications intended to cool products at temperatures below - 50 ° C.
As of January 2022, the use of fluorinated gases with a GWP equal to or greater than 150 is prohibited in compact multipack refrigeration systems for commercial use, with a rated capacity equal to or greater than 40 kW.
As of January 2025, the use of HFC fluorinated gases with a GWP equal to or greater than 750 in single air conditioning systems containing less than 3 kg is prohibited.
If the maximum permissible refrigerant charge is exceeded, an explosive atmosphere risk analysis must be performed.
Alternative load limit in occupied premises
Alternative for risk management in refrigeration systems in occupied spaces: according to RSIF 2019 IF04 Appendix 4.
The power of the indoor unit must not exceed 25% of the total capacity; The refrigeration exchanger must be designed to prevent ice damage, and must be protected against fan breakage; Refrigeration connections must be permanent, and protected against accidental damage; The doors are not airproof.
Maximum load with additional ventilation, based on an oxygen concentration of 18.5% by volume, assuming a homogeneous mixture.
kg/m³
Maximum load with minimal ventilation, in a non-hermetic room with a 4mm opening under a 0.8m-wide door.
kg/m³
kg
If the maximum indicated charge is exceeded, additional safety measures must be taken: natural or mechanical ventilation, safety shut-off valves, and alarm, together with a leak detector.
kg
%MAX_ALT_LOAD_2%
kg

Refrigerant rule

Regla

kPa(a)
ºC
ºC
kg/m³
kg/m³
kJ/kg
gr/mol
kPa
ºC
kgeq CO2/kg

Hydraulic piping

Selection

Selection parameters
W
ºC
ºC
Fluid freezing. Operation temperature is below the freezing point of the fluid.
m³/h
kg/s
ºC
%
Pipe selection
Pa/m
Nominal diameterFluid velocityPressure lossThermal gain/loss

Calculation

Piping
mm
mm
mm
W/m·K
W/m2·K
m
Pressure drop check
m/s
Pa/m
High refrigerant speed: we recommend to select a larger size.
Low refrigerant speed. We recommend to select a smaller size to reduce refrigerant load.
Excessive pressure drop: we recommend to select a larger size.
thermal loss check
W/m
%
Excessive thermal loss. we recommend to increase insulation thickness.
Surface condensation check
ºC
ºC
Risk of surface condensation: We recommend to increase insulation thickness.
Load calculation
kg
OK. All checks are satisfactory.

Cooling pipes

Design

Cooling cycle
W
ºC
K
ºC
K
kg/s
%WARN_HIGH_DCHRG%
Cooling pipes
m
m
ºC
%
m
Selection
mm
mm

Suction

Tubería de gas
mm
W/m·K
W/m²·K
High refrigerant speed: we recommend to select a larger size.
Pressure drop check
kPa
K
ºC
ºC
Excessive pressure drop: we recommend to select a larger size.
Excessive thermal loss: we recommend to increase insulation thickness.
Cooling capacity check
Rated loss of cooling capacity due to a lower refrigerant flow displaced by the compressor.
%
Rated thermal loss by air convection along the suction line.
%
Unacceptable loss of capacity: You must select a larger size.
Excessive loss of capacity: We recommend to select a larger size.
Excessive thermal loss: we recommend to increase insulation thickness.
Oil drag check
m/s
m/s
Insufficient refrigerant speed for oil drag: We recommend to select a larger size.
Surface condensation check
ºC
ºC
Risk of surface condensation: We recommend to increase insulation thickness.
OK. All checks are satisfactory.

Liquid

Liquid pipe
mm
W/m·K
W/m2·K
High refrigerant speed: we recommend to select a larger size.
Low refrigerant speed. We recommend to select a smaller size to reduce refrigerant load.
Pressure drop check
m/s
kPa
ºC
K
Risk of liquid cavitation. Excessive pressure drop may lead to flash gas in the liquid line. We recommend to select a larger size.
Cooling capacity check
%
Excessive thermal loss in subcooled liquid line. we recommend to increase insulation thickness.
Surface condensation check
ºC
ºC
Risk of surface condensation: We recommend to increase insulation thickness.
Load calculation
kg
OK. All checks are satisfactory.

Discharge

Discharge pipe
mm
W/m·K
W/m²·K
High refrigerant speed: we recommend to select a larger size.
Pressure drop check
kPa
ºC
Excessive pressure drop: we recommend to select a larger size.
Oil drag check
m/s
m/s
Insufficient refrigerant speed for oil drag: We recommend to select a larger size.
OK. All checks are satisfactory.

Coldroom

reset

Start

Cold room type
mm
m
m
m
m³
Application
ºC
Location
ºC
Standard calculation and selection of cooling units. Click here to select a refrigeration unit based on standard parameters.

Products

Product type
ºC
%
ºC
%
kJ/kg·K
kJ/kg
kJ/kg·K
Packaging
kg/kg
Product loading
kg/m³
kg
%/24h
kg/24h
ºC
Product cooling
kg
mm
mm
mm
kg/m³
W/m·K
m/s
ºC
h
ºC
Product drying
%
d
kg/dia
m/s
m2
m³/h

Room

Location
m
ºC
%
ºC
ºC
Thermal insulation
m²
mm
m²
mm
m²
mm
m²
mm
Glazing
m²
Insolation
kWh/m²

Air renewal

Ventilation through doors
ºC
%
m
m
min
/24h
/24h
Controlled atmosphere
kgCO2/24h
%
m³/h

Loads

Staff occupancy
W/pers
pers
Lighting
W/m²
m²
Door heater
W/m
m
Defrost
Fans
m³/h
Pa
%
kW
Other thermal loads
kW
h/24h

Results

Cooling needs
h
kJ
kJ
kJ
kJ
kJ
h
Necessary cooling capacity
Cooling capacity for cooling new product inlet with continuous operation, with no door openings and no defrost cycles.
W
Cooling capacity to keep the room temperature with no product inlet.
W
W
Necesary heating capacity
W
W
Too high heat loss through panels: Heat flow through the insulation is higher than the maximum recommended values. We recommend to increase insulation thickness.
Fresh product input: the inlet temperature of goods is higher than the the freezing point.
Floor heating: Floor heating or ventilation might be needed to prevent the ground from freezing.
Insufficient floor insulation: Insufficient or no floor insulation will lead to ground freezing.
CO2 concentration: Respiration of goods will generate CO2, and its concentration will be higher than 2% if there is no atmosphere control system. Such a level of CO2 can be harmful for certain goods.
CO2 concentration: Respiration of goods will generate CO2, and its concentration will be higher than 5% if there is no atmosphere control system. Such a level of CO2 can be harmful for certain goods and is dangerous for humans. There must be a forced ventilation previous to door opening.
Superficial condensation: Insufficient insulation of the enclosure will lead to water vapour condensation on the outer face. We recommend to increase the insulation thickness.
Superficial condensation: There might be water vapour condensation on the door or window outer face. We recommend to use triple glass with double air chamber.
Superficial condensation: There might be water vapour condensation on the floor perimeter. We recommend to increase floor insulation.

print

Cooling calculator

Coldroom

Coldroom

Calculation of cold rooms, process rooms, blast cooling tunnels, etc.

 Cooling pipes

Cooling pipes

Calculation of refrigerant pipes for refrigeration split units and centralised DX systems.

 Hydraulic piping

Hydraulic piping

Calculation of hydraulic pipes for indirect refrigeration systems with glycol water or brine.

 Refrigerant rule

Refrigerant rule

Calculation rule for thermophysical properties of most usual refrigerants.

 Refrigerant charge limit

Refrigerant charge limit

Calculation of the refrigerant charge limit according to safety regulations.

 Psychrometry

Psychrometry

Calculation of psychrometric properties of moist air.