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Glass &Windows Selection

Hotels ,Motels ,Equipments, Refrigeration Plant
Refrigeration Plant

Chillers

At least two (2) chillers shall be provided, each capable of carrying more than 2/3 of the total load. Stand-by capacity shall also be chosen for water circulating pumps on the same basis as chillers. An alternative configuration recommended is a three chiller system with each chiller sized at 50% of the total load.

Selection for type of refrigerating equipment to be used shall be based on the following:

Partial load operating characteristics -vs- building load profile.

Availability, reliability of supply and cost of water.

Chemical and physical properties of available water.

Availability, quality and cost of electrical energy supply.

Availability and cost of hotel produced steam.

Availability of skilled maintenance help.

Type of equipment with which local maintenance help will be familiar.

Availability of manufacturer's local service organisation.

Availability of replacement parts.

The refrigerant used shall be friendly to the environment and will be concurrent with the latest worldwide recommendation for ozone protection.

Heat reclaim systems.

Where electric drive refrigerating equipment is selected, an evaluation shall be made to determine the most energy efficient machine. This machine shall become the basis for design. The evaluation shall include the KW/ton over the full operating range with the actual condenser water temperature.

All Kitchen refrigeration equipment, including the ice making machines located in Kitchens and pantries, shall be of the water cooled condenser type. This condenser water circuit shall be connected to the cooling tower water and provided with its own independent dual pumping system. It shall be wired to the stand by power system if the refrigeration equipment is also connected. A separate cooling tower shall be required for systems operating in freezing climate. Air cooled refrigeration is also acceptable.

Independent packaged air conditioning units shall be provided to computer room and PABX room to ensure acceptable operating temperature throughout the year. These systems are to be connected to the emergency electrical supply.

 

Cooling Towers

Cooling towers shall be multiple cell type, manufactured so that one (1) cell can be operated independently of the other.

All condenser water for refrigeration equipment including Kitchen equipment shall be supplied from cooling towers. (A city water connection and drain must be provided for the refrigeration equipment during tower maintenance). If freezing climate is encountered, separate cooling tower for refrigeration equipment shall be required.

Automatic controls shall be provided to cycle the cooling tower fans to adjust condenser water temperature. Provide automatic chemical dosing equipment and bleed off TDS controller.

More information about Hotel Design
Circulating Pumps

Pumps shall be vertical or horizontal split case type

Pumps shall be furnished with suction and discharge gauge taps located immediately before and after the pump casing if not integral. Suitable taps shall be provided for filling, venting and draining.

Motors shall be non overloading at 25% beyond the specified pump duty point of the pump curve and shall be selected at 1150 or 1750 rpm. Consideration will be given to pumps operating at 3450 rpm with prior approval from Sheraton.

Pump casings shall be cast iron, tested at 1.5 times the working pressure of the system. Shafts and shaft sleeves shall be stainless steel and impellers shall be bronze.

Mechanical seals shall be used and suitable for the service and temperature of the system. Seals shall be of the self-flushing type. Seals internal to the stuffing box shall have special flushing arrangements.

More information about Hotel Design
 
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