Editorial Technical Reference

Evaporator

This page explains how Evaporator is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A heat exchanger component in a refrigeration system where refrigerant absorbs heat from the surrounding environment, causing it to evaporate from liquid to vapor.

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Product Specifications

Technical details and manufacturing context for Evaporator

Definition
The evaporator is a critical component within refrigeration and air conditioning systems where the actual cooling effect occurs. It functions as a heat exchanger where low-pressure, low-temperature liquid refrigerant absorbs thermal energy from the medium being cooled (air, water, or another fluid), causing the refrigerant to boil and change phase into a vapor. This heat absorption process cools the target medium. In a typical vapor-compression refrigeration cycle, the evaporator is positioned after the expansion device and before the compressor. The evaporator is available in various configurations, typically using copper, aluminum, or steel for construction. Key parameters include cooling capacity (1–100 kW), operating pressure (1.0–1.6 MPa), design temperature (-40 to 85 °C), and compatibility with refrigerants such as R134a, R404A, R410A, and R22 (per ISO 17584). Heat transfer area ranges from 0.5 to 20 m², with tube materials like copper, stainless steel 304, or aluminum (per ASTM B280, A312, B221) and fin materials like aluminum, copper, or stainless steel (per ASTM B209, B152, A240). Fin spacing is 1.5–4.0 mm, tube diameter 9.52–15.88 mm (per ISO 1127), and leakage rate ≤0.1 g/yr (per EN 1779). Pressure drop is 10–50 kPa, weight 5–200 kg, and dimensions vary from 300×200×150 mm to 2000×1000×800 mm. These values are reference ranges; verify model-specific data with the manufacturer. The evaporator's design must consider heat load, refrigerant type, and environmental regulations. Proper selection ensures efficient cooling and system reliability. Always confirm specifications with the supplier for your application.
Working Principle
Liquid refrigerant, having passed through an expansion valve or capillary tube, enters the evaporator at low pressure and temperature. As it flows through the evaporator coils or tubes, it absorbs latent heat from the warmer surrounding medium (e.g., air blown across the coils). This heat transfer causes the refrigerant to evaporate, changing its state from a liquid to a saturated vapor. The now-cooled air or fluid is circulated to provide the desired cooling effect, while the vaporized refrigerant is drawn into the compressor to continue the cycle.
Common Materials
Copper, Aluminum, Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Cooling Capacity1–100 kWSelect based on heat load and refrigerant type
Design Temperature-40–85 °CExceeding range may cause material failure
RefrigerantR134a, R404A, R410A, R22Compatibility with oil and materialsISO 17584
Heat Transfer Area0.5–20 m²Determines capacity and footprint
Tube MaterialCopper, Stainless Steel 304, AluminumCorrosion resistance and thermal conductivityASTM B280, ASTM A312, ASTM B221
Fin MaterialAluminum, Copper, Stainless SteelAffects heat transfer and corrosionASTM B209, ASTM B152, ASTM A240
Fin Spacing1.5–4.0 mmTighter spacing improves efficiency but may clog
Tube Diameter9.52–15.88 mmCommon sizes for refrigerationISO 1127
Leakage Rate≤0.1 g/yrMust meet environmental regulationsEN 1779
Pressure Drop10–50 kPaHigher drop reduces system efficiency
Weight5–200 kgAffects installation and structural support
Dimensions (L×W×H)300×200×150 – 2000×1000×800 mmCustomizable per installation space

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Coil Tubes Part
    Channels through which the refrigerant flows, providing the primary surface for heat absorption.
    Material: Copper or Aluminum
  • Fins Part
    Thin metal plates attached to the tubes to increase the total heat transfer surface area and improve thermal efficiency.
    Material: Aluminum
  • Distribution Header
    Ensures even distribution of liquid refrigerant into multiple parallel coil circuits.
    Material: Copper or Brass

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Refrigeration System
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Refrigeration Unit
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Industrial Chiller
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 30 bar
flow rate: 0.5 to 50 m³/h
temperature: -40°C to 150°C
slurry concentration: Up to 40% solids by weight
Media Compatibility
✓ Water/Glycol Solutions ✓ Ammonia Refrigerant ✓ Hydrocarbon Refrigerants
Unsuitable: Chlorinated Solvents
Sizing Data Required
  • Heat Load (kW)
  • Refrigerant Type and Properties
  • Required Evaporation Temperature

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Scaling and Fouling
Cause: Accumulation of mineral deposits, salts, or biological growth on heat transfer surfaces due to poor water quality, inadequate pretreatment, or insufficient blowdown cycles, leading to reduced heat transfer efficiency, increased energy consumption, and potential overheating.
Corrosion and Pitting
Cause: Chemical attack from aggressive process fluids, oxygen ingress, or improper pH control, exacerbated by high temperatures and stagnant conditions, resulting in wall thinning, leaks, and structural integrity loss, particularly in tubes, tube sheets, and shells.
Maintenance Indicators
  • Significant drop in evaporator efficiency (e.g., reduced condensate output or increased steam consumption without process changes)
  • Visible leaks, steam or vapor escaping from joints, or audible hissing sounds indicating pressure loss or seal failure
Engineering Tips
  • Implement a rigorous water treatment and blowdown control program to minimize scaling and fouling, including regular monitoring of TDS (Total Dissolved Solids) and pH levels.
  • Conduct periodic non-destructive testing (e.g., ultrasonic thickness gauging) on critical components like tubes and shells to detect early corrosion or wear, and apply protective coatings or cathodic protection where feasible.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASME BPVC Section VIII - Pressure vessel construction PED 2014/68/EU - Pressure Equipment Directive (CE marking)

Quoted from the published standard.

Manufacturing Precision
  • Tube wall thickness: +/-0.1mm
  • Flatness of mounting surfaces: 0.2mm
Quality Inspection
  • Hydrostatic pressure test
  • Helium leak detection test

Manufacturers of Evaporator

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Frequently Asked Questions

What is the typical cooling capacity range for this evaporator?

The cooling capacity range is 1 to 100 kW, but the exact value depends on the heat load and refrigerant type. Always confirm the required capacity with the manufacturer for your specific application.

Which refrigerants are compatible with this evaporator?

The evaporator is designed for use with refrigerants R134a, R404A, R410A, and R22, as per ISO 17584. Compatibility with other refrigerants should be verified with the supplier.

What materials are used for the tubes and fins?

Tube materials can be copper, stainless steel 304, or aluminum, per ASTM B280, A312, and B221. Fin materials can be aluminum, copper, or stainless steel, per ASTM B209, B152, and A240. Material selection affects corrosion resistance and thermal conductivity.

What is the maximum allowable leakage rate?

The leakage rate is specified as ≤0.1 g/yr, per EN 1779. This is a reference value; the actual leakage rate must be verified with the manufacturer to ensure compliance with environmental regulations.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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