Closed Loop System Freeze Protection

When air temperatures plummet, frost and freezing protection of closed loop systems is of the utmost importance. Most commonly glycol (antifreeze) is added to the system to provide the necessary protection.

Glycol based water solutions are commonly used in heat-transfer closed loop systems, where the temperature in the heat transfer fluid can be below 0oC and therefore cause freezing and damage to the integrity of the plant.

Ethylene Glycol is the most common antifreeze fluid for standard heating and cooling applications. If there is a risk of human ingestion, Propylene Glycol which is food safe, should be used.

Protection from freezing is imperative when a system requires pumping. It is achieved when the glycol concentration in a system is sufficient to prevent ice crystals from forming when the fluid experiences its lowest temperature.

The chart below under gives an idea of how the freezing point is lowered when Ethylene Glycol or Propylene Glycol (Food safe) is added to water systems.

 
Percentage Ethylene Glycol Freezing point temperature Percentage Propylene Glycol Freezing point
temperature
0% 0°C 0% 0°C
10% -3°C 10% -3°C
20% -8°C 20% -8°C
30% -16°C 30% -14°C
40% -25°C 40% -22°C
50% -37°C 50% -34°C
60% -55°C 60% -48°C

Specific heat capacity, viscosity and specific weight of a water and Ethylene Glycol solution will vary significantly with the percentage of Ethylene Glycol and the temperature of the fluid. Indeed properties differ so much from clean water, that heat transfer systems with Ethylene Glycol should be calculated thoroughly for actual temperature and solution.

HBE can help with the following services:

  • Initial surveys of closed loop systems to determine the water chemistry and from that, decide on an appropriate plan of action.
  • Supply of both propylene & monoethylene glycol.
  • Dosing the chemical into the system.

If you require any further information or help with your freeze protection or Glycol dosing, call 0845 6399673 or email us at enquiries@hberm.com

Recent News

  • Legionella bacteria hbe

£1 million fine imposed on Hot Tub store after 2012 Legionnaires’ disease outbreak

July 10th, 2017|Comments Off on £1 million fine imposed on Hot Tub store after 2012 Legionnaires’ disease outbreak

A Discount Warehouse store has been fined £1m for their failings in 2012, where a Legionnaires' disease outbreak was caused by a display hot tub in the store, where 21 people were infected with Legionella bacteria, two of whom died.

  • HSG282 Legionella control in Spa Pools Jan2017

Spa Pool Technical Guidance HSG282 released

February 13th, 2017|Comments Off on Spa Pool Technical Guidance HSG282 released

HSE's technical guidance HSG282: The control of legionella and other infectious agents in Spa-Pool systems has been released.

  • Legionella bacteria hbe

Care Home chain resident dies of Legionnaires’ Disease

October 4th, 2016|Comments Off on Care Home chain resident dies of Legionnaires’ Disease

An inquest has heard that both process & training requirements were ignored at the Essex care home of a well known chain before the death of a resident from Legionnaires' disease.

  • Legionella bacteria hbe

Company fined £1.8m for Legionella management failings

September 7th, 2016|Comments Off on Company fined £1.8m for Legionella management failings

A large UK Company has been fined £1.8m after Harlow Council prosecuted the company for failing to manage Legionella risks on its sites.

  • HTM04-01 Water Hygiene Services HBE

How does the new HTM04-01 healthcare guidance affect you?

June 8th, 2016|Comments Off on How does the new HTM04-01 healthcare guidance affect you?

In May 2016 the Department of Health released new Guidance for Safe Water in Healthcare documentation, Health Technical Memorandum HTM04-01.