How to Choose a Chiller for a Hotel in a Hot Climate: TRANE 1845 kW Case Study at Hilton Egypt

TRANE RTHF 535 HSE for Hilton Egypt: An Engineering Solution for Horeca When it comes to designing cooling systems for hotels in Egypt, “comfort” is not just a marketing term — it becomes a matter of survival. With daytime temperatures reaching +48 °C and asphalt melting underfoot, even the smallest error in HVAC design can have serious consequences.

This is precisely why the new facility for Hilton in Egypt, implemented by Sharm Dreams Co. for Touristic Investment S.A.E, selected a reliable chiller known in the technical community as the “workhorse of the desert” — the TRANE RTHF 535 HSE, a water-cooled giant with a cooling capacity of 1845 kW. This chiller will be a core component of the hotel’s engineering system.

Climate as a Challenge in HVAC Design

Before discussing the technical details, one must understand the climatic challenge:

• Average daytime temperatures in summer: +43 to +46 °C
• Peak highs: up to +48 °C
• Relative humidity: 20–30%
• Nighttime lows in summer: +32 to +35 °C
• Cooling tower water temperatures: +32 °C inlet, +37 °C outlet

The thermal load for the 39,000 m² hotel with pools, spa zones, restaurants, and a concert hall is approximately 1850–2000 kW at peak conditions. This is based on internal energy sources (people, equipment, lighting), heat ingress through structures, and ventilation with outside air intake.

Why TRANE RTHF 535 HSE?

The TRANE RTHF 535 HSE is a 1845 kW water-cooled centrifugal chiller designed for harsh climates and high operational reliability.

• Nominal cooling capacity: 1845 kW at +7 °C evaporator water, +30 °C condenser water
• Refrigerant type: R134a (GWP ~1430), with retrofit option to R513A (GWP ~631)
• Compressors: 2 TRANE screw compressors with adjustable inlet guide vanes, nominal efficiency 0.62 kW/kW
• Heat exchangers: shell-and-tube with internal rifling, tubes made of marine brass (CuZn20Al2), anti-corrosion lacquered
• Control system: Tracer AdaptiView, with Modbus/BACnet/IP support for BMS integration
• Water circuit: 316 m³/h through evaporator, 412 m³/h through condenser
• Pressure drop: 60 kPa (evaporator), 75 kPa (condenser)
• Year of manufacture: 2022
• Runtime: zero operational hours (design life of up to 200,000 hours in hot climates)
• Working weight with refrigerant: 9,959 kg
• Dimensions: L 4.6 m × W 2.0 m × H 2.4 m

The chiller is designed to operate with condenser water temperatures up to +38 °C. The project includes a dedicated cooling tower that ensures heat rejection under high ambient temperatures. At +46 °C ambient temperature, an air-cooled chiller using R410A would deliver a COP around 2.3 during peak. For the same cooling load, it would consume about 800 kW.

In contrast, the water-cooled TRANE RTHF under the same conditions, with +37 °C condenser water, achieves a COP of 5.0, consuming only 370–390 kW. This correlation highlights both financial savings in electricity and technical longevity of the HVAC system. In Egypt, water-cooled systems are not optional—they’re essential.

Chiller Preparation for Shipment

The client outlined key requirements for chiller preparation:

• Thorough external cleaning before loading
• Preparation of technical passport in English
• Complete CE documentation set, factory test protocols, electrical and hydraulic diagrams
• Compliance with ISO 5149 safety standards and ISO 9001 quality management
• No service package or warranty from the supplier — the client assumes full responsibility for commissioning and operation

Loading will be coordinated with the client’s logistics agent. The shipping date will be finalized based on site readiness.

Environmental Parameters

Although R134a is used in this project, the system allows for future retrofitting to R513A or even R1234ze. The expected COP drop is only 3–5%, accounted for in project planning.

The R134a charge is 547 kg, equivalent to ~745 tonnes of CO₂-equivalent emissions—similar to burning ~330,000 liters of diesel. Therefore, leak monitoring is a serious requirement even outside the EU.

Hydraulic Design

To achieve the specified performance, the chiller connects to two hydraulic circuits:

• Evaporator: 316 m³/h, ΔT = 5 °C
• Condenser: 412 m³/h, ΔT = 5 °C

Minimum evaporator water temperature under load: +6.5 °C Maximum condenser water temperature: up to +37 °C

Pump groups are oversized by +10% headroom to compensate for fouling and wear.

What You Get with EVROPROM

The TRANE RTHF 535 HSE project is an example of a systemic engineering approach where mistakes are costly. It’s a solution built for longevity, not just the season.

We analyze your processes thermally and hydraulically to ensure the chiller becomes an extension of your infrastructure:

• SCOP/ESEER calculations for your climate
• Operating mode selection for efficiency and lifespan
• Failure resilience modeling
• Documentation ready for any audit—from TÜV to ISO 50001

EVROPROM is your engineering partner that calculates every kilowatt—for heat, for pressure, for trust.

Article Author:

Sviatoslav Ovcharenko,

Sales Manager, Africa & Middle East Region

07.07.2025