Emicool: To maintain the primary network from the District Cooling Plant room up to the Energy Transfer Station (ETS) or up to the main valve of the building/villa where there is direct connection supply from the plant to ensure that the chilled water is supplied at the agreed temperature and delta-T at the Primary side.
Master/Sub developer: To maintain the secondary network (including Secondary side of Heat Exchangers, Secondary Chilled Water Pumps, Secondary Piping Network, including the secondary Chilled Water supply temperature) until the entry point to the premises (villas, apartments, shops…) of the end user.
Customers: To maintain all equipment and related network within their premises to ensure the highest uninterrupted efficient and clean supply of Air Conditioning.
The Energy Consumption Charge payable by the Customer to the Service Provider is found by multiplying the Metered Consumption in any period by the rate of AED [X] per TRh.
The Energy Consumption Charge is payable in arrears each month on or before the Due Date, against Monthly Invoices to be issued by the Service Provider to the Customer.
Opening meter reading – closing meter reading = Consumption of RTH
Cost: 0.56/RTH Monthly Charges
The Fuel Surcharge is determined by DEWA on a monthly basis and is levied by the Service Provider to the Customer based on the cost of electrical energy element of the Energy Consumption Charge. The amount is as per DEWA published monthly tariff
Reference to International Standards and District Cooling Norms, customer shall maintain a differential temperature between primary supply and return of 8.9°C at all times:
It is building owner’s responsibility to maintain differential temperature (delta T) which is 8.9°C to avoid low delta T syndrome that affect district cooling plant operation and energy consumption to Emicool. In absence of correct Building Differential Temperature (delta T), Emicool has the right to add temperature surcharge at a rate which shall be calculated as an increase by 10% on consumption charge for each Degree Celsius that the building temperature Differential is less than minimum delta T – 8.9°C or Emicool has right to vary supply chilled water temperature to achieve 8.9°C delta T.
End-users, who receive chilled water from a district cooling plant pay a consumption charge (and other charges) for the chilled water delivered to their building. That charge is assessed based on the flow and temperature difference (or Delta-T) between the supply going to the building, and the return coming from the building (measured at the ETS room). A low delta-T charge is assessed when the difference between the supply and the return water temperature is less than 9°C.
Delta-T is caused from the demand-side due to the presence of one or more of the following conditions:
- Design and construction issues: Oversized or under-sized HVAC systems and its network equipment such as improper coil selection causing low chilled water velocity, improper control valves selection or use of 3-way valvesv(1) made for constant flow systems and not VFDs, oversized valves “hunt”, undersized Actuators within the end-user’s building
- Incomplete building commissioning with no adequate (or any) BMS control over Delta-T (e.g. lack of controls calibration or improper set-points)
- Poor building O&M: fouled heat exchangers, fouled coils, cold water flowing through inactive coils (due to faulty actuators), leaky 2-way valves, or no control valve interlock.
On the customer’s side (building), given the presence of any of the conditions above, the building will often suffer through specific times during the year (esp. during the colder months, and specific times during summer months) from chilled water network imbalance and unequal distribution of cooling energy across the load zones. This results in less conditioning of the living space and higher humidity, and hence, low standards of comfort for the tenants.
Filters should be cleaned at least once every three months by a professional maintenance company.
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